Entries |
Document | Title | Date |
20080205547 | METHOD AND SYSTEM FOR SOFTWARE DEFINED POWER AMPLIFIER FOR MULTI-BAND APPLICATIONS - Methods and systems for software definition of a power amplifier for multi-band applications are disclosed and may comprise configuring a single programmable output stage of a transmitter to transmit a signal via one of a plurality of selectively coupled antennas, wherein each antenna handles signals in a different frequency band. A power amplifier within the single programmable output stage may be tuned to a frequency within a range of frequencies handled by the selectively coupled antenna. The tuning may be accomplished by programmably adjusting at least one inductance and capacitance. The antennas may be impedance matched to the power amplifier using transformers and may be activated by at least one integrated transistor. The power amplifier may be biased in a class of operation, which may include Class A, AB, C and F, and may be biased utilizing a digitally-controlled current source and a digitally-controlled voltage source. | 08-28-2008 |
20080205548 | METHOD AND SYSTEM FOR A SOFTWARE DEFINED POWER AMPLIFIER FOR MULTI-BAND, MULTI-STANDARD APPLICATIONS - Methods and systems for a software defined power amplifier for multi-band, multi-standard applications are disclosed and may comprise configuring a single programmable output stage of a multi-band, multi-standard transmitter to handle transmission of a signal according to multiple wireless communication protocols and frequency ranges. The output stage may be configured by coupling a power amplifier (PA) within the programmable output stage to a switch or a duplexer, which may be coupled to one or more of multiple antennas, each of which may handle signals in a different frequency range. Each antenna may be impedance matched with the power amplifier using transformers, and may be coupled by activating at least one integrated transistor. The PA may be biased to operate in one of a plurality of classes of operation comprising Class A, AB, C and F associated with the wireless communication protocols, which may comprise EDGE, GSM, WCDMA and wireless LAN. | 08-28-2008 |
20080225981 | SYSTEM AND METHOD FOR SYNCHRONIZATION, POWER CONTROL, CALIBRATION, AND MODULATION IN COMMUNICATION TRANSMITTERS - A system is provided for processing a communication signal including a baseband amplitude component and a baseband phase component. The system includes an amplitude predictor configured for closed-loop pre-distortion of a baseband amplitude component, an amplitude lookup table configured for open-loop pre-distortion of the baseband amplitude component, and an amplitude interpolator configured to build up the amplitude lookup table during a closed-loop calibration period. The system also includes a phase predictor configured for closed-loop pre-distortion of a baseband phase component, a phase lookup table configured for open-loop pre-distortion of the baseband phase component, and a phase interpolator configured to build up the phase lookup table during a closed-loop calibration period. | 09-18-2008 |
20080240288 | DIFFERENTIAL TRANSMISSION CIRCUIT, DISK ARRAY APPARATUS, AND OUTPUT SIGNAL SETTING METHOD - To provide a signal transmitting/receiving apparatus etc. where a cable length can be measured by using a general-purpose cable, without using an interface. A differential transmission circuit by the present invention includes a signal output circuit sending a high-speed differential signal and a pulse wave; a signal input circuit including a terminating resistor; a bias controller controlling a bias voltage on a transmission path; a terminating resistance controller disconnecting the terminating resistor on sensing a bias voltage and connecting it on sensing no bias voltage, by a bias sensing circuit; a sensing input circuit sensing a pulse wave reflected at the signal input circuit; and an output setting controller setting an electric characteristic of a signal outputted from the signal output circuit by a propagation time from sending the pulse wave by the signal output circuit to receiving the reflected pulse wave by the sensing input circuit. | 10-02-2008 |
20080253477 | Iq-Modulator Pre-Distortion - An IQ-modulator pre-distorter includes an iteratively updated digital filter (gQ | 10-16-2008 |
20080260066 | Dynamic digital pre-distortion system - A Dynamic Digital Pre-Distortion (DDPD) system is disclosed to rapidly correct power amplifier (PA) non-linearity and memory effects. To perform pre-distortion, a DDPD engine predistorts an input signal in order to cancel PA nonlinearities as the signal is amplified by the PA. The DDPD engine is implemented as a composite of one linear filter and N-1 high order term linear filters. The bank of linear filters have programmable complex coefficients. To compute the coefficients, samples from the transmit path and a feedback path are captured, and covariance matrices A and B are computed using optimized hardware. After the covariance matrices are computed, Gaussian elimination processing may be employed to compute the coefficients. Mathematical and hardware optimizations may be employed to simplify and reduce the number of multiplication operands and other operations, which can enable the DDPD system to fit within a single chip. | 10-23-2008 |
20080285681 | Systems and Methods of RF Power Transmission, Modulation, and Amplification - Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion. | 11-20-2008 |
20080298501 | Method and apparatus for distortion correction of RF amplifiers - A method of reducing distortion in the output of an amplifier is provided. The method comprises subtractively combining an error signals with the appropriate phase shift with input signals to be amplified. The error signal being generated by subtractively combining a fed-forward portion of the input signal with a portion of the fed-back amplified output signal, and signal processing applied to it between its generation and application to correcting the input signal in the baseband domain. The error therefore being down-converted, filtered, and up-converted in the feedback path. The filtered baseband error signal components providing inputs to a controller which adjusts active elements of the amplification and feedback path in order to minimize the distortion within the output of the amplifier. | 12-04-2008 |
20080310549 | Transmission controlling method in wireless communications system and receiver for use in the same system - The present invention relates to a transmission controlling method in a wireless communications system and a receiver for use in the same system. The invention aims at realizing power control (or transmit rate control) more effective than previous techniques by means of utilizing a certain relationship between an error rate and an evaluation amount relating to the estimation amount. Thus, a certain relationship is defined between the evaluation amount relating to a reception condition and an error rate on the receiver, and on the basis of this certain relationship, transmit power of the transmitter is controlled. | 12-18-2008 |
20090010359 | APPARATUS AND METHOD FOR INTERFERENCE CANCELLATION IN MULTI-ANTENNA SYSTEM - An apparatus and a method for interference cancellation in a transmitting end of a multi-antenna system are provided. A precode is generated which maximizes a diversity gain of one or more receive antennas using channel information of the receive antennas to be serviced. Transmit powers of the receive antennas are updated by taking into account a power loss and a shaping loss according to a dirty paper coding. Transmit signals are precoded by updating the precode according to the updated transmit powers. The dirty paper coding is performed on the precoded transmit signals to be transmitted to the receive antennas. | 01-08-2009 |
20090022240 | Low power distributed transmitter - A low power distributed transmitter includes a signal generator, signal partitioning module, signal processing module, a plurality of amplifiers, and a transmitting module. The signal generator is operably coupled to generate a signal to represent base-band data in accordance with a particular transmission protocol. The signal partitioning module is operably coupled to partition the signal into a plurality of signal partitions based on a peak-to-average ratio of the signal. The signal processing module processes the plurality of signal partitions to in accordance with the particular transmission protocol to produce processed signals. Each of the amplifiers amplifies a corresponding one of the processed signal partitions to produce amplified signal partitioned. The transmitting module transmits, via an antenna or a plurality of antennas, the amplified signal partitions as a composite amplified signal. | 01-22-2009 |
20090052575 | System and Method for Power Control in a Wireless Transmitter - A system and method for power control in a wireless transmitter. A power control loop includes a feed forward unit coupled to a data source, the feed forward unit processes a signal for transmission, a feedback unit coupled to the feed forward unit, the feedback unit generates a feedback signal representative of an output power level of the signal transmitted by the feed forward unit, a closed loop power control unit coupled to the feedback unit and to the feed forward unit, the closed loop power control unit generates an additive correction signal based on an error signal computed from the feedback signal and data provided by the data source, and a ramp path power control unit coupled to the data source, the ramp path power control unit generates a multiplicative correction signal based on an additive correction signal and data provided by the data source. | 02-26-2009 |
20090067541 | Digital linear amplification with nonlinear components (LINC) transmitter - Embodiments of the invention may provide for a digital LINC (linear amplification with nonlinear components) transmitter. The digital LINC transmitter may include a signal component separator, at least one digital delay modulator, a frequency synthesizer, at least one power amplifier, a power combiner, an antenna, and a mismatch compensator. Additionally, systems and methods may be provided for compensating for phase and amplitude mismatches between two signal paths. | 03-12-2009 |
20090074106 | MULTI-MODE AND MULTI-BAND TRANSMITTERS FOR WIRELESS COMMUNICATION - Transmitters supporting multiple modulation modes and/or multiple frequency bands are described. A transmitter may perform large signal polar modulation, small signal polar modulation, and/or quadrature modulation, which may support different modulation schemes and systems. Circuit blocks may be shared by the different modulation modes to reduce cost and power. For example, a single modulator and a single power amplifier may be used for small signal polar modulation and quadrature modulation. The transmitter may apply pre-distortion to improve performance, to allow a power amplifier to support multiple frequency bands, to allow the power amplifier to operate at higher output power levels, etc. Envelope and phase distortions due to non-linearity of the power amplifier may be characterized for different input levels and different bands and stored at the transmitter. Thereafter, envelope and phase signals may be pre-distorted based on the stored characterizations to compensate for non-linearity of the power amplifier. | 03-19-2009 |
20090074107 | METHOD AND APPARATUS FOR OPTIMIZING TRANSMITTER POWER EFFICIENCY - A peak to average power ratio signal is generated from a first mapping function that selects the peak to average power ratio signal that corresponds to the data rate or data format of the signal to be transmitted. The selected peak to average power ratio signal is summed with a desired average transmit power signal. The resulting summation signal is input to a second effectively continuously valued mapping function comprising a table that has a plurality of power amplifier control signal values each with a corresponding peak transmit power. Each peak transmit power signal value results in a power amplifier control signal value that achieves the best possible transmitter power efficiency while still meeting out of band spurious emissions and waveform quality requirements. The summation signal value maps to one of the power amplifier control signal value that is then used to adjust a parameter such as bias of the power amplifier. | 03-19-2009 |
20090097591 | APPARATUS AND METHOD FOR ENVELOPE TRACKING POWER AMPLIFICATION IN WIRELESS COMMUNICATION SYSTEM - An apparatus and a method for Envelope Tracking (ET) power amplification in a wireless communication system are provided. The apparatus includes a baseband signal controller for outputting an envelope signal in an envelope signal path and outputting a constant signal in a baseband signal path when measuring a time delay of the envelope signal path, and for outputting a constant signal in the envelope signal path and outputting a baseband signal in the baseband signal path when measuring a time delay of the baseband signal path, a time delay difference measurer for measuring a time delay of each path by calculating a correlation coefficient between the envelope signal path and the baseband signal path and a signal time controller for setting a time delay in a corresponding path using the time delay difference of each path and aligning times. | 04-16-2009 |
20090154596 | RF TRANSMITTER HAVING MULTIPLE CONSTANT TRANSMIT POWER LEVELS - A radio frequency transmitter includes a baseband transmit processing module, a mixing module, a power amplifier, a transmit power sense module, and a transmit power control module. The baseband transmit processing module is operably coupled to encode outbound data into outbound baseband signals in accordance with one of a plurality of encoding protocols. The mixing module is operably coupled to convert the outbound baseband signals into outbound radio frequency signals. The power amplifier is operably coupled to amplify the outbound RF signals prior to transmission to produce amplified outbound RF signals. The transmit power sense module is operably coupled to sense the amplified outbound RF signals to provide a transmit signal strength indication (TSSI). The transmit power control module is operably coupled to adjust gain of the baseband transmit processing module, the mixing module, and/or the power amplifier based on the TSSI and the particular encoding protocol used to produce the baseband signals. | 06-18-2009 |
20090161793 | Processing transmission signals in radio transmitter - A method, apparatus, and computer program is presented for use in a radio transmitter using a polar transmitter structure in which a transmission signal is separated into an amplitude component and a phase component. The transmission signal includes transmission symbols distributed to a number of transmission resource blocks allocated to the radio transmitter for transmission. The amplitude component of the transmission signal is low-pass filtered in a low-pass filter configured by filtering parameters selected according to the number of transmission resource blocks allocated to the radio transmitter. Then, the low-pass filtered amplitude component is used in power supply of a power amplifier configured to power-amplify a phase component of the transmission signal. | 06-25-2009 |
20090202017 | Distortion Control Device and Method - This invention includes a waveform analyzing means ( | 08-13-2009 |
20090207939 | System and Method for Burst Mode Amplifier - Embodiments related to burst mode amplifying are described and depicted. | 08-20-2009 |
20090207940 | Predistortion Calibration In A Transceiver Assembly - Systems and methods are provided for calibrating a digital predistorter in an integrated transceiver circuit. A digital transmitter path provides a signal from a digital input. The transmitter path includes a digital predistorter that predistorts the digital input to mitigate nonlinearities associated with a power amplifier. The integrated transceiver circuit further includes a receiver path associated with the digital transmitter path. A coupling element provides the signal from the transmitter path to the receiver path. A signal evaluator determines values for at least one parameter associated with the digital predistorter based on the signal. | 08-20-2009 |
20090213961 | METHOD AND APPARATUS FOR CONTROLLING TRANSMISSION POWER IN A COMMUNICATION SYSTEM - In a communication system, a mobile terminal compares a first modulation/Forward Error Correction (FEC) rate level, which is a modulation/FEC rate level used in a previously transmitted signal, with a second modulation/FEC rate level, which is a modulation/FEC rate level to be used in a currently transmitted signal. If the second modulation/FEC rate level is higher than the first modulation/FEC rate level, the mobile terminal determines the transmission power using a normalized Carrier to Noise ratio (C/N) corresponding to the second modulation/FEC rate level on an ascending normalized C/N table, while if the second modulation/FEC rate level is lower than the first modulation/FEC rate level, the mobile terminal determines the transmission power using a normalized C/N corresponding to the second modulation/FEC rate level on a descending normalized C/N table. | 08-27-2009 |
20090245417 | TRANSMITTER CHAIN TIMING AND TRANSMIT POWER CONTROL - In a communications system, transmitter power gain can be changed between symbols. A power gain change of a first part of a transmit chain is initiated a first time, whereas a power gain change of a second part of the transmit chain is initiated at a second time, such that the resulting power gain changes of the first and second parts both occur substantially within an inter-symbol time in a desired relationship to one another. In one example, the power gain change of the first part is initiated before the beginning of the inter-symbol time to account for expected serial bus latency between initiation and execution of the power gain change of the first part. The power gain change of the second part is initiated during the inter-symbol time such that overall power does not exceed an amount (for example, a maximum permitted under a communication standard). | 10-01-2009 |
20090245418 | TRANSMITTER USING CARTESIAN LOOP - A transmitter includes a signal generator to generate a digital baseband signal corresponding to a signal to be transmitted, a digital-analog converter to convert the digital baseband signal into an analog baseband signal by operating in accordance with a clock signal, a subtracter to subtract a feedback baseband signal from the analog baseband signal to generate a residual signal, a loop filter to filter the residual signal by amplifying a low-frequency component and suppressing a high-frequency component, a modulator to modulate the filtered signal by multiplying the filtered signal, a power amplifier to amplify the modulated signal, a high frequency filter to filter the amplified modulated signal to obtain a transmit RF signal, the high frequency filter having a passband width narrower than a frequency of the clock signal, and a demodulator to demodulate a feedback RF signal which is divided from the transmit RF signal. | 10-01-2009 |
20090245419 | METHOD AND APPARATUS FOR IMPROVING POWER AMPLIFIER EFFICIENCY IN WIRELESS COMMUNICATION SYSTEMS HAVING HIGH PEAK TO AVERAGE POWER RATIOS - A power management system and method for a wireless communication device generates an average desired transmit power signal based on at least one of a received signal strength indicator signal and a power control instruction signal from a base station. A power supply level adjustment signal is generated based on the data parameters of an outgoing data stream and at least one environmental information signal. A combination of the power supply level adjustment signal and the average desired transmit power or a gain control signal and an altered version of the power supply level adjustment signal is used to generate a variable power supply signal that is provided to an output amplifier block for sufficiently generating outgoing wireless device radio signals while reducing power loss in the output amplifier block. | 10-01-2009 |
20090252255 | PREDISTORTION METHODS AND APPARATUS FOR POLAR MODULATION TRANSMITTERS - Methods and apparatus for predistorting signals in a polar modulation transmitter. An exemplary method includes predistorting an envelope component signal in an amplitude path of a polar modulation transmitter according to a set of AM/AM predistortion coefficients, and predistorting a phase component signal in a phase path of the polar modulation transmitter according to a set of AM/PM predistortion coefficients. The AM/AM and AM/PM predistortion coefficients are stored in a memory in the form of a look up table (LUT). The envelope component signal is scaled and/or offset, before predistortion is applied, by an amount dependent upon which average power level of a plurality of average power levels the power amplifier of the polar modulation transmitter is configured to operate. Scaling and/or offsetting the envelope component signal prior to applying predistortion affords the ability to share the AM/AM and AM/PM predistortion coefficients of the predistortion LUT over the plurality of average power levels. | 10-08-2009 |
20090285329 | TRANSMISSION POWER CONTROL METHOD AND TRANSMISSION APPARATUS - Even when there is limit placed upon transmission power control time, the transmission power control method enables accurate control transmission power. The transmission power control method includes: a first measuring step of measuring, in a symbol interval before a symbol interval where mode of the power amplifier changes, output power of the power amplifier before mode changes; a first setting step of setting target power of the power amplifier after mode changes based on a measurement result obtained in the first measuring step and a transmission power control signal; a second measuring step of measuring, in the symbol interval where mode of the power amplifier changes, output power of the power amplifier after mode changes, the output power being controlled using the target power set in the first setting step; and a second step of setting corrected target power based on a measurement result obtained in the second measuring step. | 11-19-2009 |
20090285330 | LOOP DELAY AND GAIN CONTROL METHODS IN CLOSED-LOOP TRANSMITTERS AND WIRELESS DEVICES - Embodiments include transmitters, wireless devices, and methods for performing loop delay and gain control. In a transmitter, a gain application element receives and combines digital input samples and a digital gain signal to generate gain-compensated digital samples. A power amplifier receives and amplifies an analog version of the gain-compensated digital samples to generate an antenna output signal. A feedback path generates an analog feedback signal from the antenna output signal, to produce a sequence of digital feedback samples from the analog feedback signal, and generates the digital gain signal from the sequence of digital feedback samples and a loop gain estimate. A loop delay and gain calculator calculates a loop delay estimate from the gain-compensated digital samples and the sequence of digital feedback samples, and calculates the loop gain estimate using the loop delay estimate, the gain-compensated digital samples, and the sequence of digital feedback samples. | 11-19-2009 |
20090285331 | CONTROL OF POWER AMPLIFIERS IN DEVICES USING TRANSMIT BEAMFORMING - A radio transmitter and method controls efficiency of each of a plurality of power amplifiers that amplify a corresponding one of a plurality of radio frequency signals for a beamforming transmission by a corresponding one of a plurality of antennas. Each of the plurality of power amplifiers is controlled to operate with one or more operating parameters that optimize the efficiency for an output power level of corresponding ones of the radio frequency signals. Transmit weights for transmit signals are determined and updated on a per-packet basis. | 11-19-2009 |
20090296855 | TRANSMISSION CIRCUIT FOR BIAS CONTROL OF POWER AMPLIFIER - Provided is a transmission circuit that is capable of switching a bias circuit without allowing a power amplifier to enter a non-bias state. A first bias circuit | 12-03-2009 |
20090323857 | CONFIGURABLE SUB-BAND FILTERING TO REDUCE PEAK-TO-AVERAGE POWER RATIO OF OFDM SIGNALS OR THE LIKE - Briefly, in accordance with one or more embodiments, a reduction in peak-to-average power ratio (PAPR) in an OFDM signal may be achieved by clipping the OFDM signal, extracting the clipping noise, filtering the clipping noise, and then constructing the clipped OFDM signal with the filtered clipping noise. | 12-31-2009 |
20100014609 | DISTORTION CORRECTION CONTROL APPARATUS AND DISTORTION CORRECTION CONTROL METHOD - A distortion correction control apparatus is for compensating for a burst distortion in a transmission amplifier caused by a burst of an input signal of a transmission target. The apparatus includes a holding unit that stores a distortion correction coefficient having reverse characteristics to the burst distortion; a unit that multiplies the distortion correction coefficient read out from the holding unit by the input signal or adds the distortion correction coefficient read out from the holding unit to the input signal, upon reception of burst information notifying of switching between presence and absence of the input signal; and an update unit that updates, based on the input signal, the distortion correction coefficient of the last time, and a signal fed back as an output signal of the transmission amplifier, the distortion correction coefficient by an adaptive algorithm, and that inputs the updated distortion correction coefficient to the holding unit. | 01-21-2010 |
20100020899 | METHOD AND APPARATUS FOR IMPROVING DIGITAL PREDISTORTION CORRECTION WITH AMPLIFIER DEVICE BIASING - A method, apparatus, and electronic device for using digital predistortion are disclosed. A transmitter | 01-28-2010 |
20100020900 | DIGITAL PRE-DISTORTION TECHNIQUE USING NONLINEAR FILTERS - A method and computer program product for operating a linearizer for a circuit, including generating a set of coefficients via a characterizer; predistorting a signal input to the circuit responsive to the coefficients and generating a linearized output in response thereto; filtering the signal through a linear digital filter having linear digital filter taps, each tap other than a first tap being successively delayed by one delay unit; generating powers of the signal; inputting the generated powers of the signal through tapped delay lines, each line having nonlinear digital filter taps, each tap other than a first tap being successively delayed by one delay unit; applying the coefficients to the linear and nonlinear digital filter taps; summing each of the nonlinear digital filter taps corresponding to a certain number of delay units; and adding the sum of each of the delay units to a particular linear digital filter tap. | 01-28-2010 |
20100034315 | REVERSE LINK POWER CONTROL FOR AN OFDMA SYSTEM - Techniques for performing power control of multiple channels sent using multiple radio technologies are described. The transmit power of a reference channel, sent using a first radio technology (e.g., CDMA), is adjusted to achieve a target level of performance (e.g., a target erasure rate) for the reference channel. The transmit power of a data channel, sent using a second radio technology (e.g., OFDMA), is adjusted based on the transmit power of the reference channel. In one power control scheme, a reference power spectral density (PSD) level is determined based on the transmit power of the reference channel. A transmit PSD delta for the data channel is adjusted based on interference estimates. A transmit PSD of the data channel is determined based on the reference PSD level and the transmit PSD delta. The transmit power of the data channel is then set to achieve the transmit PSD for the data channel. | 02-11-2010 |
20100119008 | PROGRAMMABLE WIDE BAND DIGITAL RECEIVER/TRANSMITTER - A receiver uses a wideband intermediate frequency (IF) in the analog domain and performs low IF down-conversion in the digital domain, using low-power, high-speed, high resolution analog-to-digital converters. The receiver can be integrated into an integrated circuit as one of several receivers. Such an integrated circuit may include multiple transmitters using adaptive non-linear modeling pre-distortion. The non-linear modeling may include memory. Imbalance in intermediate frequency in-phase and quadrature signals may be corrected in the digital domains. DC offsets in the intermediate signal may be corrected in both analog and digital domains. In one instance, the receiver provides a feedback receiver for the adaptive pre-distorter in a transmitter on the integrated circuit. | 05-13-2010 |
20100158155 | SYSTEM AND METHOD FOR TRAINING PRE-INVERSE OF NONLINEAR SYSTEM - A circuit for use with an amplification circuit having a predistortion datapath portion, a power amplifier portion and a gain portion. The predistortion datapath portion can output a predistorted signal based on the input signal. The power amplifier portion can output an amplified signal based on the predistorted signal. The gain portion can output a gain output signal based on the amplified signal. The circuit comprises a digital predistortion adaptation portion and a combiner. The digital predistortion adaptation portion can output a predistortion adaptation portion output signal. The combiner can output an error signal. The predistortion adaptation portion output signal is based on the input signal, the gain output signal and the error signal. The error signal is based on the difference between the predistorted signal and the predistortion adaptation portion output signal. | 06-24-2010 |
20100177848 | TRANSMITTER WITH REDUCED SPECTRAL REGROWTH AND ASSOCIATED METHODS - A transmitter includes a monitoring circuit for monitoring phase transitions of in-phase and quadrature components of an input phase modulated signal. A filter is downstream from the monitoring circuit for generating a filtered phase modulated signal within an allocated bandwidth. A transmit gain controller is downstream from the filter for adjusting an amplitude of the filtered phase modulated signal based on a dynamic reference envelope control signal. A control circuit cooperates with the monitoring circuit and the transmit gain controller for generating the dynamic reference envelope control signal so that phase transitions are suppressed in the filtered phase modulated signal and so that the filtered phase modulated signal remains within the allocated bandwidth. | 07-15-2010 |
20100215120 | Low-Power Polar Transmitter - Apparatus and methods for providing transmit signals in polar transmitters are described. A modulation signal may be provided from a VCO to low noise and low power signal paths and selectively combined based on a desired output power level. CMOS and CML divider circuits may be used to implement the low noise and low power signal paths respectively, and logic may be provided to select desired signals from the low noise and low power signal stages based on the desired output power level. | 08-26-2010 |
20100239048 | METHOD AND APPARATUS FOR IMPROVING THROUGHPUT AND ERROR PERFORMANCE OF RATELESS CODING SYSTEMS - A method and system are described for adaptively adjusting data communication of a rateless coding system, including adaptively estimating a symbol coding length, determining a symbol threshold, determining if the adaptively estimated symbol coding length is less than the symbol threshold, adjusting a transmission power level based on the second determining act and adaptively adjusting a modulation scheme based on the second determining act. Also described are a method and system for decoding communication of a rateless coding system, including receiving encoded symbols, determining if a length of the received encoded symbols is greater than a threshold number of encoded symbols and decoding the received encoded symbols if the length of the received encoded symbols is greater than the threshold number of encoded symbols. | 09-23-2010 |
20100272214 | RADIOFREQUENCY TRANSMISSION SYSTEM - The invention relates to a radiofrequency transmission system comprising: means of producing a complex digital signal quantised on N bits; means of transforming the complex digital signal into two complex digital signals with an identical and constant envelope that are phase-shifted with respect to one another; a digital processing pathway associated with each of the two complex digital signals with a constant envelope and comprising at least some filtering means of the sigma-delta type for quantising on M bits signals travelling in the processing pathway, M being less than N; digital-to-analogue conversion means for converting the outputs of the digital processing pathways into analogue signals; means of selectively filtering (of the bandpass type) the analogue signals in a predetermined transmission frequency band; means of amplifying the filtered analogue signals; and means of recombining the amplified analogue signals. | 10-28-2010 |
20100303170 | METHOD AND APPARATUS FOR PRE-PROCESSING DATA TO BE TRANSMITTED IN MULTIPLE-INPUT COMMUNICATION SYSTEM - A method for pre-processing data to be transmitted in a multiple-input communication system comprises the following steps: generating a beamforming matrix and a pre-coding matrix; combining the beamforming matrix and the pre-coding matrix to generate a weight matrix; and pre-processing the data by using the generated weight matrix. There are also provided a transmitter, a base station, and a communication system using the method. | 12-02-2010 |
20100322346 | TRANSMITTER ARCHITECTURES - Techniques for generating a transmit (TX) signal with improved characteristics in the presence of interference such as noise and distortion. In one aspect, the TX output signal is used to generate a reconstructed signal having the characteristics of the interference, and the reconstructed signal is subtracted from the baseband TX signal. The reconstructed signal may be generated by high-pass filtering the TX output signal at baseband. Alternatively, the reconstructed signal may be generated from a reference signal Ref derived from the baseband TX signal. | 12-23-2010 |
20110007841 | RF TRANSMITTER AND METHOD OF OPERATION - A linear RF transmitter ( | 01-13-2011 |
20110085619 | SYSTEM AND METHOD FOR SYNCHRONIZATION, POWER CONTROL, CALIBRATION, AND MODULATION IN COMMUNICATION TRANSMITTERS - A system is provided for processing a communication signal including a baseband amplitude component and a baseband phase component. The system includes an amplitude predictor configured for closed-loop pre-distortion of a baseband amplitude component, an amplitude lookup table configured for open-loop pre-distortion of the baseband amplitude component, and an amplitude interpolator configured to build up the amplitude lookup table during a closed-loop calibration period. The system also includes a phase predictor configured for closed-loop pre-distortion of a baseband phase component, a phase lookup table configured for open-loop pre-distortion of the baseband phase component, and a phase interpolator configured to build up the phase lookup table during a closed-loop calibration period. | 04-14-2011 |
20110103512 | METHOD AND SYSTEM FOR MINIMIZING POWER CONSUMPTION IN A COMMUNICATION SYSTEM - A method for processing signals in a communication system includes delaying a baseband signal based on at least one calibration signal, and amplifying the delayed baseband signal. The at least one calibration signal may be generated based on an amount of intermodulation distortion associated with the amplified delayed baseband signal. A bias voltage of an amplifier used for the amplifying may be adjusted, where the adjusting is in proportion to an envelope of the baseband signal. A number of samples used for the delaying may be calculated, by minimizing the amount of the intermodulation distortion at an output of the amplifier. The envelope may be measured by evaluating a plurality of I and Q samples of the baseband signal. A supply and/or bias voltage for the amplifier may be generated by using a switching regulator. The bias voltage may control a gain of the amplifier. | 05-05-2011 |
20110200142 | Up-Converted and Amplified Transmission Signal Using Log-Antilog - According to one exemplary embodiment, a method for producing an up-converted and amplified transmission signal comprises performing a logarithmic transformation of an input transmission signal to form a logarithmically transformed transmission signal, adding the logarithmically transformed transmission signal to a logarithmic local oscillator signal to form a sum signal, and performing an antilogarithmic transformation of the sum signal to produce the up-converted and amplified transmission signal. In one embodiment, a log-antilog circuit for producing an up-converted and an amplified transmission signal comprises a transmission log block configured to receive an input transmission signal and to provide a logarithmically transformed transmission signal as a transmission log block output, and an antilog block coupled to the transmission log block. The antilog block is configured to receive a sum signal of the transmission log block output and a logarithmic local oscillator signal. | 08-18-2011 |
20110216851 | ROBUST TRANSMIT/FEEDBACK ALIGNMENT - Performing digital predistortion (DPD) for widely spaced narrowband signals, such as the signal used in multi-carrier GSM, can be very difficult. Here, a system is provided the performs DPD for widely spaced narrowband signals. In particular, this system uses a polynomial curve for values of a cross-correlation function (above a predetermined threshold) to determine a delay estimate, which allows for a more robust and accurate system. | 09-08-2011 |
20110222630 | COMMUNICATION DEVICE AND POWER CORRECTION METHOD - A communication device that compensates a distortion of a transmission signal, amplifies the compensated transmission signal by an amplifier, and outputs the signal. The device includes a storage unit that stores a transmission characteristic of a transmission power of the communication device, a correcting unit that calculates a power value at a set transmission frequency by referring to the storage unit and that corrects a feedback signal of the transmission signal amplifier by the amplifier based on the calculated power value and a maximum transmission power defined by the communication device, and a calculating unit that calculates a distortion compensation coefficient based on the transmission signal and the feedback signal corrected. | 09-15-2011 |
20110255636 | DISTORTION COMPENSATION CIRCUIT, TRANSMITTING APPARATUS AND DISTORTION COMPENSATING METHOD - A distortion compensation circuit for compensating for the distortion characteristics of an amplifier, includes a distortion compensating coefficient calculating element and a distortion compensating operation element. The distortion compensating coefficient calculating element calculates a distortion compensating coefficient to be used for compensation of the distortion characteristics by comparing an input signal with the output signal amplified by the amplifier. The distortion compensating operation element performs a distortion compensating operation on the input signal, using a variably set bit format and the distortion compensating coefficient calculated by the distortion compensating coefficient calculating element. | 10-20-2011 |
20110261903 | WIRELESS COMMUNICATION UNIT, INTEGRATED CIRCUIT AND METHOD OF POWER CONTROL OF A POWER AMPLIFIER THEREFOR - A wireless communication unit comprises a transmitter having a forward path comprising a power amplifier, PA, and a feedback path operably coupled to the power amplifier, wherein the feedback path comprises a coupler arranged to feed back a portion of a signal to be transmitted and a controller logic module arranged to control a power control value of the power amplifier, such that the forward path and feedback path form a closed loop power control. The controller logic module is arranged to determine a gain variation in the transmitter and provide attenuation to a transmit signal passing therethrough on a transmit slot by transmit slot basis and instruct a power backoff where necessary. | 10-27-2011 |
20110274210 | TIME ALIGNMENT ALGORITHM FOR TRANSMITTERS WITH EER/ET AMPLIFIERS AND OTHERS - An apparatus and method for aligning input and feedback signals in a transmission circuit are provided. The method includes capturing an input signal and a feedback signal, determining a first time delay between the input signal and the feedback signal, determining a second time delay between the input signal and the feedback signal, the determination of the second time delay having a higher resolution than the determination of the first time delay, and applying the first time delay and the second time delay to temporally align the input signal with the feedback signal. Use of the present invention provides an improved resolution of time alignment while reducing the overall complexity and cost of the transmission circuit. | 11-10-2011 |
20110280338 | TRANSMISSION APPARATUS AND METHOD OF CONTROLLING THE SAME - A transmission apparatus according to the present invention includes: a baseband signal generator; a local oscillator; a modulator that generates a modulation signal by multiplying a baseband signal by a carrier wave signal including a local oscillation frequency; a power amplifier that amplifies the modulation signal; a filter having a pass bandwidth that is narrower than a frequency bandwidth that can be set or emerge in the local oscillator and removes at least a part of unwanted component generated in association with the modulation signal that is amplified; and a frequency bandwidth inside/outside decision unit that decides that the local oscillation frequency is out of a predetermined bandwidth. The transmission apparatus controls one of the baseband signal generator and the local oscillator to reduce the modulation signal when it is decided by the frequency bandwidth inside/outside decision unit that the local oscillation frequency is out of the predetermined bandwidth. | 11-17-2011 |
20120002752 | PREDISTORTION OF COMPLEX MODULATED WAVEFORM - Exemplary embodiments of the invention include a transmitter system configured to predistort an input signal to generate a target output signal. An exemplary transmitter system includes a forward path including a predistortion device coupled with an amplifier, the forward path configured for predistorting an input signal to the predistortion device in response to a phase error compensation signal and an amplitude error compensation signal in order to generate a desired output signal for the output signal of the amplifier, and a feedback path including a processor configured for generating the phase error compensation signal and the amplitude error compensation signal based on a comparison of the input signal with phase and amplitude information of the output signal of the amplifier, wherein the phase and amplitude information of the amplifier are transmitted to the processor on a single path of the feedback path. Other methods and apparatuses are also presented herein. | 01-05-2012 |
20120008717 | CONVERSION SYSTEM - The invention relates to frequency conversion systems, in particular for use as up-converters or down-converters in radiofrequency (RF) receivers or transmitters, exemplary embodiments including a radiofrequency receiver ( | 01-12-2012 |
20120027125 | CODEBOOK, CODEBOOK CREATING METHOD, UPLINK TRANSMISSION METHOD AND EQUIPMENT BASED ON THE CODEBOOK - A codebook, a codebook creating method, and an uplink transmission method and equipment based on the codebook are provided. A new codebook is put forward in the method. The codebook includes one or any combination of the following elements: | 02-02-2012 |
20120057654 | SELECTIVE PEAK POWER REDUCTION - The present invention provides a technique for reducing the peak power of a combined signal that has a first signal of a first modulation type and a second signal of a second modulation type. Based on the combined signal, peak reduction distortion is determined. The peak reduction distortion is configured such that, if applied to the entirety of the combined signal, excessive peaks throughout the combined signal would be reduced. However, instead of applying the entirety of the peak reduction distortion, a selected portion of the peak reduction distortion is applied to a corresponding portion of the combined signal to reduce the peak power of the combined signal. | 03-08-2012 |
20120063544 | METHOD AND DEVICE FOR PRE-DISTORTING AN EXCITER AND PREDISTORTION EXCITER - A method for pre-distorting an exciter includes obtaining a characteristic curve of a radio frequency (RF) amplifier, obtaining a first relationship between a gain amplitude correction value and an input power and a second relationship between a gain phase correction value and the input power based on the characteristic curve, obtaining a transmission gain for use in a scan from a magnetic resonance pre-scan, and obtaining the gain amplitude correction value and the gain phase correction value of an input of the exciter based on the input of the exciter, the transmission gain, the first relationship, and the second relationship. An input of the exciter is pre-distorted using the gain amplitude correction value and the gain phase correction value. | 03-15-2012 |
20120076237 | Close-loop power amplifier pre-distortion correction - Attenuation is provided at the output of a power amplifier that provides transmitted signals or packets. The attenuation particularly provides separation of linear and non linear behavior of the signals. A reference packet is transmitted during attenuation. A normal packet is delivered without attenuation. Feedback from the reference packet can be extracted using the normal packet to calculate a loop-back response that is extracted and sent to a power amplifier pre-distortion correction algorithm. | 03-29-2012 |
20120087441 | METHOD AND APPARATUS FOR OPTIMIZING TRANSMITTER POWER EFFICIENCY - A peak to average power ratio signal is generated from a first mapping function that selects the peak to average power ratio signal that corresponds to the data rate or data format of the signal to be transmitted. The selected peak to average power ratio signal is summed with a desired average transmit power signal. The resulting summation signal is input to a second effectively continuously valued mapping function comprising a table that has a plurality of power amplifier control signal values each with a corresponding peak transmit power. Each peak transmit power signal value results in a power amplifier control signal value that achieves the best possible transmitter power efficiency while still meeting out of band spurious emissions and waveform quality requirements. The summation signal value maps to one of the power amplifier control signal value that is then used to adjust a parameter such as bias of the power amplifier. | 04-12-2012 |
20120106676 | Transmitter Linearized In Response To Signal Magnitude Derivative Parameter and Method Therefor - A transmitter ( | 05-03-2012 |
20120128099 | Method and Frequency Agile Pre-distorted Transmitter Using Programmable Digital Up and Down Conversion - Pre-distorted transmitters operable over a wide range of frequencies including a plurality of predetermined frequency bands are provided. The transmitters include a programmable digital up-converter and a programmable digital down-converter, an ADC, a DAC, a power amplifier and at least one analog filter arranged along a transmit signal path and a feedback signal path. | 05-24-2012 |
20120147993 | METHOD AND SYSTEM FOR BASEBAND PREDISTORTION LINEARIZATION IN MULTI-CHANNEL WIDEBAND COMMUNICATION SYSTEMS - In some embodiments, a method of reducing adjacent channel power ratio and compensating memory effects of multi-channel wideband communication systems using multiplexing modulation techniques is provided. The method includes generating an address from samples of a baseband input signal of a communication system. The method also includes retrieving from a memoryless lookup table an entry in accordance with the address. The method further includes pre-equalizing the baseband input signal, the pre-equalization depending on one or more magnitudes of the input signal. The method still further includes multiplying the pre-equalized baseband input signal and the lookup table entry. | 06-14-2012 |
20120155572 | High efficiency, remotely reconfigurable remote radio head unit system and method for wireless communications - A remote radio head unit (RRU) system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier inside the RRU. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by a wideband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, embodiments of the present invention can compensate for the nonlinearities as well as memory effects of the power amplifier systems and also improve performance, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers, multi-frequency bands and multi-channels. As a result, the remote radio head system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems. | 06-21-2012 |
20120163498 | SAMPLING CIRCUIT, COMMUNICATION DEVICE, DISTORTION CORRECTION CIRCUIT, SIGNAL SAMPLING METHOD, AND PROGRAM - A sampling circuit samples a transmission signal containing a particular transmission signal transmitted in a regular and intermittent transmission pattern. The sampling circuit includes a sampling processing unit that performs a sampling process that samples the transmission signal; a determination unit that determines whether the sampling process has been successfully or unsuccessfully performed; and a sampling control unit that sets up sampling acquisition intervals for the sampling processing unit in which the intervals differ depending on whether the sampling process is successfully or unsuccessfully, the sampling processing unit performing the sampling process based on the sampling acquisition interval that has been set up by the sampling control unit. | 06-28-2012 |
20120177143 | COMPOSITE AMPLIFIER, TRANSMITTER, AND COMPOSITE AMPLIFIER CONTROL METHOD - A signal distributor sequentially outputs N input signals respectively corresponding to N rows of a matrix of which each has N element signals in which a predetermined matrix is obtained by dividing the matrix by a predetermined value. A coupler adds the amplified N element signals for each the input signal. A solver computes feedback signals Y* for the individual amplifiers by using an addition result Y of the outputs for each the input signal and the inverse matrix L | 07-12-2012 |
20120201330 | METHOD AND SYSTEM FOR TRANSMITTING SIGNALS WITH REDUCED SPURIOUS EMISSIONS - An RF power amplifier architecture minimizes spurious emissions by breaking the transmitted signal into narrow spectrum sub-bands, amplifying each separately, and then combining the signals for transmission purposes. | 08-09-2012 |
20120224653 | COMPOSITE POWER AMPLIFIER, TRANSMITTER, AND COMPOSITE-POWER-AMPLIFIER CONTROL METHOD - C-HPA separates an input signal into separated signals, and amplifies and combines the separated signals. The C-HPA includes a plurality of signal splitters, a delay discrepancy estimator, and a delay discrepancy adjuster. Each of the signal splitters splits each of the separated signals into a signal in which a time component of the separated signal is put ahead a predetermined time and a signal in which the time component is delayed the predetermined time, and outputs split signals. The delay discrepancy estimator uses the input signal, the split signals output from each of the signal splitters and the combined output signal to estimate delay discrepancy between the separated signals. The delay discrepancy adjuster uses the estimated delay discrepancy to adjust the delay discrepancy between the separated signals. | 09-06-2012 |
20120224654 | TRANSMITTER AND DISTORTION COMPENSATING METHOD - A transmitter, when the power changes at a certain timing, adjusts the gain for the transmission signal before the application of the distortion compensation process correspondingly to the amplitude of the transmission signal at the certain timing based on the average of the power of a transmission signal before application of the distortion compensation process, obtains a distortion compensation coefficient corresponding to the value of the power of the adjusted transmission signal from the LUT, applies the distortion compensation process to the transmission signal using the obtained distortion compensation coefficient, calculates an update for a distortion compensation coefficient corresponding to the obtained distortion compensation coefficient and stored in the LUT based on an error between the power of the transmission signal amplified by an amplifier and the power of the transmission signal before the application of the distortion compensation process, and updates the LUT using the calculated update. | 09-06-2012 |
20120236964 | SYSTEM AND METHOD FOR REDUCING BIT-ERROR-RATE IN ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING - System and method for reducing BER in OFDM based communication system. A cost function relating the power partition coefficients and the average power emitted by the linear power amplifier at the transmitter during quasistatic periods of the channel may be minimized, solved or estimated, based on the received channel partial CSI, and on knowledge of the linear power amplifier gain and linear dynamic range, to get power partition coefficients. The total available power may be divided among the subcarriers according to the resultant power partition coefficients. Additionally, the OFDM signal may amplified by a variable gain calculated based on the resultant power partition coefficients. | 09-20-2012 |
20120243637 | Power Amplification Based on Phase Angle Controlled Frequency Reference Signal and Amplitude Control Signal - Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion. | 09-27-2012 |
20120263257 | SIGNAL AMPLIFYING APPARATUS, WIRELESS TRANSMITTING APPARATUS, AND SIGNAL AMPLIFYING METHOD - A signal amplifying apparatus, a wireless transmitting apparatus, and a signal amplifying method are provided. The signal amplifying apparatus modulates an envelope signal using a multi-bit quantizer, thereby increasing coding efficiency and tracking optimal supply voltage with respect to envelope variation due to the use of the multi-bit quantizer. | 10-18-2012 |
20120269291 | RF TRANSMITTER, INTEGRATED CIRCUIT DEVICE, WIRELESS COMMUNICATION UNIT AND METHOD THEREFOR - A radio frequency (RF) transmitter has at least one digital signal processing module and at least one power amplifier module. The digital signal processing module includes at least one digital pre-distortion component arranged to receive at least one complex input signal, perform two-dimensional non-uniform mapping of the complex input signal to a first, in-phase, digital pre-distortion control word and a further, quadrature, digital pre-distortion control word, and output the in-phase and quadrature pre-distortion digital control words. The power amplifier module includes a first, in-phase, array of switch-mode power cells and at least one further, quadrature, array of switch-mode power cells. The two-dimensional non-uniform mapping has a pre-distortion profile at least partly based on an input/output relationship for the power amplifier module arranged to generate an analogue RF signal based at least partly on the in-phase and quadrature digital pre-distortion control words. | 10-25-2012 |
20120269292 | RF TRANSMITTER, INTEGRATED CIRCUIT DEVICE, WIRELESS COMMUNICATION UNIT AND METHOD THEREFOR - A radio frequency (RF) transmitter including at least one digital signal processing module is described. The at least one digital signal processing module is arranged to receive a complex digital input signal, successively apply pre-distortion to the received complex digital input signal with a progressively finer granularity, simultaneously progressively increase a sampling rate of the received complex digital input signal, and output a first, in-phase digital control word and a second, quadrature, digital control word for controlling at least one digital power amplifier component to generate an RF signal representative of the received complex digital input signal. | 10-25-2012 |
20120269293 | RF TRANSMITTER ARCHITECTURE, INTEGRATED CIRCUIT DEVICE, WIRELESS COMMUNICATION UNIT AND METHOD THEREFOR - A radio frequency (RF) transmitter architecture includes at least one digital signal processing module. The at least one digital signal processing module is configurable to operate in at least a first mode wherein the at least one digital signal processing module is arranged to receive a digital input signal, select, from a reduced set of digital power amplifier (DPA) control values, a plurality of DPA control values based at least partly on the received digital input signal, perform interpolation of the plurality of selected DPA control values to determine a DPA control value from a non-reduced set of DPA control values representative of the received digital input signal, and output to at least one DPA component the determined DPA control value representative of the received digital input signal. | 10-25-2012 |
20120275544 | ENVELOPE EXTRACTION WITH REDUCED BANDWIDTH FOR POWER MODULATION - A system according to one embodiment includes a digital data modulator configured to generate encoded symbols; an envelope detector configured to receive the encoded symbols and to estimate transmission power information associated with the encoded symbols; a peak detector configured to receive the transmission power information, detect a peak transmission power from two or more sequential data points of the received transmission power information, and to generate a power regulation signal representative of the detected peak transmission power; and a digital to analog converter (DAC) configured to receive the power regulation signal and to provide a reference voltage to a power supply associated with an RF amplifier. | 11-01-2012 |
20120275545 | DISTORTION COMPENSATION APPARATUS AND DISTORTION COMPENSATION METHOD - A distortion compensation apparatus for performing distortion compensation processing by applying the inverse properties of distortion properties of said power amplifier to a transmission signal to be input to a power amplifier, includes a plurality of distortion compensation coefficient storage units configured to store a plurality of distortion compensation coefficients used for said distortion compensation processing, an offset correction processing unit configured to subject said distortion compensation coefficient stored in each of said plurality of distortion compensation coefficient storage units to offset correction processing, and to generate distortion compensation coefficients in the case that said offset correction processing has not been performed, corresponding to said plurality of distortion compensation coefficient storage units, in a pseudo manner and a distortion compensation processing unit configured to subject said transmission signal to said distortion compensation processing based on said distortion compensation coefficients generated in a pseudo manner. | 11-01-2012 |
20120281786 | Compensating for a Radio Frequency Amplifier - An analog radio frequency input and an analog feedback from an output of a radio frequency amplifier are digitized and down-converted. Pre-distortion coefficients are calculated based on the down-converted input and down-converted feedback and the down-converted input is filtered using the pre-distortion coefficients. The filter output is then up-converted to a carrier frequency and converted to analog to be provided to the radio frequency amplifier. | 11-08-2012 |
20120288030 | DISTORTION COMPENSATION DEVICE AND DISTORTION COMPENSATING METHOD - A distortion compensation device which reduces a distortion of an amplifier which is added to an output signal of the amplifier, the distortion compensation device including: a plurality of distortion compensation coefficient storage circuits which stores a plurality of distortion compensation coefficients and outputs the distortion compensation coefficients according to an amplitude of an input signal of the amplifier, a distortion compensating processing circuit which adds the distortion compensation coefficient output from each of the plurality of distortion compensation coefficient storage circuits to the input signal of the amplifier, and a distortion compensation coefficient updating circuit which performs weighting processing on the distortion compensation coefficient output from each of the plurality of distortion compensation coefficient storage circuits to reduce the distortion compensation coefficient and which calculates an update value of the distortion compensation coefficient by using the distortion compensation coefficient which is subjected to the weighting processing. | 11-15-2012 |
20120314807 | RADIO COMMUNICATION DEVICE - A radio communication device includes an amplification unit configured to amplify a transmission signal, an antenna transmitting an amplification signal amplified by the amplification unit, a detection unit configured to detect a reflection signal that is the amplification signal reflected from a side of the antenna, and a correction processing unit configured to correct the transmission signal, wherein the correction processing unit is configured to correct the transmission signal based on the reflection signal when installation of a filter through which the amplification signal passes is recognized. | 12-13-2012 |
20120328050 | CENTRALIZED ADAPTOR ARCHITECTURE FOR POWER AMPLIFIER LINEARIZATIONS IN ADVANCED WIRELESS COMMUNICATION SYSTEMS - Embodiments of a centralized predistortion system and corresponding adaptive predistortion processes are disclosed. In general, a central node includes one or more centralized predistortion components that enable predistortion for one or more remote transmit chains in order to compensate for non-linearity of power amplifiers in the one or more remote transmit chains. For instance, in one embodiment, the central node is a hub base station and the one or more remote transmit chains are included in one or more transmitters at one or more satellite base stations. | 12-27-2012 |
20130034188 | Signal Transmitter Linearization - A linearizer for a non-linear transmitter includes a tap delay line that provides samples of an input signal at selected times. At least one Volterra tap is coupled to the tape delay line. The Volterra tap includes a lookup table representation of a polynomial. An adaptive controller is coupled to the Volterra tap for modifying values in the lookup table. | 02-07-2013 |
20130044836 | DEVICE AND METHOD FOR PRE-DISTORTING AND AMPLIFYING A SIGNAL BASED ON AN ERROR ATTRIBUTE - A method and a device. The device may include: a non-linear amplifying circuit for applying a non-linear gain function on an analog signal to provide an amplified signal; an input circuit, for clipping I-channel and Q-channel digital input signals, to provide clipped I-channel and Q-channel digital signals; a pre-distortion circuit, for pre-distorting the clipped I-channel and Q-channel digital signals such as to at least partially compensate for a non-linearity of the non-linear gain function, to provide pre-distorted I-channel and Q-channel digital signals; a mixed signal circuit for converting the pre-distorted I-channel and Q-channel digital signals to the analog signal; a reconstruction circuit for generating reconstructed I-channel and Q-channel signals; and a control circuit, arranged to: calculate an error attribute based on the clipped and the reconstructed I-channel and Q-channel digital signals and to affect a gain of at least one components of the device in response to the error attribute. | 02-21-2013 |
20130058435 | HIGH EFFICIENCY TRANSMITTER - A transmitter includes: a decoder for transforming an IQ signal into a linear sum of two vectors which have non-negative coefficients, respectively, which form an angle of (π/4), and which are included in eight vectors representing directions indicated by eight angles of (−π/2), 0, (π/2), π, (−3π/4), (−π/4), (π/4), and (3π/4), respectively, and for outputting information upon magnitudes and angles of the two vectors; a phase generator for generating eight phase signals corresponding to phases of (−π/2), 0, (π/2), π, (−3π/4), (−π/4), (π/4), and (3π/4), respectively, and outputting the eight phase signals; and a selector for selecting two phase signals having phases equivalent to angles of the two vectors, from among the eight phase signals, and amplifying the two phase signals having been selected, based on the information upon the magnitudes and the angles, and outputting, as a plurality of amplification signals, the two phase signals having been amplified. | 03-07-2013 |
20130064325 | LINEARIZATION FOR A SINGLE POWER AMPLIFIER IN A MULTI-BAND TRANSMITTER - A multi-band signal is generated by combining two or more input signals separated in frequency. The input signals are combined either before or after predistortion depending on the bandwidth of the multi-band signal. If the bandwidth of the multi-band signal is less than a predetermined bandwidth threshold, the input signals are combined and predistortion is applied to the combined signal to generate the multi-band signal. If the bandwidth of the multi-band signal is greater than the bandwidth threshold, the individual input signals are predistorted and subsequently combined to generate the multi-band signal. | 03-14-2013 |
20130077713 | SYSTEM AND METHOD FOR INCREASING BANDWIDTH FOR DIGITAL PREDISTORTION IN MULTI-CHANNEL WIDEBAND COMMUNICATION SYSTEMS - A digital predistortion linearization method is provided for increasing the instantaneous or operational bandwidth for RF power amplifiers employed in wideband communication systems. Embodiments of the present invention provide a method of increasing DPD linearization bandwidth using a feedback filter integrated into existing digital platforms for multi-channel wideband wireless transmitters. An embodiment of the present invention utilizes a DPD feedback signal in conjunction with a low power band-pass filter in the DPD feedback path. | 03-28-2013 |
20130083866 | DISTORTION COMPENSATOR AND DISTORTION COMPENSATION METHOD - A distortion compensator compensates for distortion of a signal caused by an amplifier. A storage section stores a plurality of compensation coefficients used for distortion compensation. A selection section selects a compensation coefficient corresponding to an index value indicative of a power level of the signal from among the plurality of compensation coefficients. The selection section determines whether or not the power level is higher than a threshold, and uses, based on a determination result, a first index value calculated without using a logarithmic operation or a second index value calculated by using a logarithmic operation. | 04-04-2013 |
20130094611 | DIGITALLY-CONTROLLED POWER AMPLIFIER WITH BANDPASS FILTERING/TRANSIENT WAVEFORM CONTROL AND RELATED DIGITALLY-CONTROLLED POWER AMPLIFIER CELL - A digitally-controlled power amplifier (DPA) with bandpass filtering includes a radio-frequency (RF) clock input, an amplitude control word (ACW) input, and a plurality of DPA cells. The RF clock input is arranged for receiving an RF clock. The ACW input is arranged for receiving a digital ACW signal. The DPA cells are coupled to the RF clock and the digital ACW signal, wherein at least one of the DPA cells is gradually turned on and off in response to at least one bit of the digital ACW signal. | 04-18-2013 |
20130094612 | MULTI-BAND WIDE BAND POWER AMPLIFIER DIGITAL PREDISTORTION SYSTEM - A high performance and cost effective method of RF-digital hybrid mode power amplifier systems with high linearity and high efficiency for multi-frequency band wideband communication system applications is disclosed. The present disclosure enables a power amplifier system to be field reconfigurable and support multiple operating frequency bands on the same PA system over a very wide bandwidth. In addition, the present invention supports multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. | 04-18-2013 |
20130129019 | RF Power Transmission, Modulation, and Amplification, Including Direct Cartesian 2-Branch Embodiments - Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion. | 05-23-2013 |
20130148760 | TRANSFORMER POWER COMBINER WITH FILTER RESPONSE - A method for generating an amplified radio frequency (RF) signal is provided. In-phase (I) and quadrature (Q) signals are received and interleaved so as to generate a time-interleaved signal. Delayed time-interleaved signals are then generated from the time interleaved signal, and each of the delayed time-interleaved signals is amplified so as to generate a plurality of amplified signals. The amplified signals are then combined with a transformer, where the delayed time-interleaved signals are arranged to generate a filter response with the transformer. | 06-13-2013 |
20130163694 | ARCHITECTURE OF A LOW BANDWIDTH PREDISTORTION SYSTEM FOR NON-LINEAR RF COMPONENTS - Systems and methods for compensating for non-linearity of a non-linear subsystem using predistortion are disclosed. In one embodiment, a system includes a non-linear subsystem and a predistorter configured to effect predistortion of an input signal of the non-linear subsystem such that the predistortion compensates for a non-linear characteristic of the non-linear subsystem. In addition, the system includes a narrowband filter that filters a feedback signal that is representative of an output signal of the non-linear subsystem to provide a filtered feedback signal, and an adaptor that adaptively configures the predistorter based on the filtered feedback signal and a reference signal that is representative of an input signal of the non-linear subsystem. By utilizing the filtered feedback signal, rather than the feedback signal, a complexity, and therefore, cost of the adaptor is substantially reduced. | 06-27-2013 |
20130163695 | APPARATUS AND METHOD FOR CALIBRATION OF TRANSMITTER IN COMMUNICATION DEVICE - A method and an apparatus for calibration of a transmitter not having a Surface Acoustic Wave (SAW) filter are provided. The apparatus includes a calibration unit for outputting a detuning signal by which a resonance frequency of a Radio Frequency (RF) circuit is detuned with respect to a transmit operating frequency, and an RF unit for changing the resonance frequency according to the detuning signal and for outputting an out-of-band noise and a transmit signal having a relatively lower power than that of a case where the resonance frequency and the transmit operating frequency are tuned to each other. | 06-27-2013 |
20130163696 | APPARATUS FOR COMPENSATING FOR DISTORTION OF TRANSMITTER ARRAY IN RADIO COMMUNICATION SYSTEM AND METHOD FOR CONTROLLING THE SAME - Provided is a method in which a Digital Pre-Distorter (DPD) performs digital pre-distortion on a received In-phase (I) signal, a received Quadrature-phase (Q) signal, a feedback I signal, and a feedback Q signal; a mixer mixes a signal output from the DPD with a frequency signal output from an oscillator; each of n phase shifters phase-shifts a signal output from the mixer according to a preset beamforming pattern; each of n Power Amplifiers (PAs) amplifies a signal output from an associated phase shifter according to a gain, the PAs connected to the associated phase shifter on a one-to-one basis; each of n envelope detectors detects an envelope signal from a signal output from an associated PA, the envelope detector connected to the associated PA on a one-to-one basis; and a control unit determines whether the n PAs operate normally, using the envelope signals output from the n envelope detectors. | 06-27-2013 |
20130170581 | QUADRATURE DIGITAL-IF TRANSMITTER WITHOUT INTER-STAGE SAW FILTER AND DEVICES USING SAME - An RF transmitter comprises a digital-to-IF circuit block configured to receive a digital in-phase baseband signal and a digital quadrature baseband signal and to up-convert the digital in-phase and quadrature baseband signals to a digital in-phase IF signal and to a digital quadrature IF signal. The wireless RF transmitter further comprises an IF-to-RF circuit block configured to convert the digital in-phase and quadrature IF signals to analog signals and to up-convert the analog in-phase and quadrature IF signals to an RF output signal. The digital-to-IF circuit block comprises pre-compensation circuitry configured to reduce analog impairments associated with the IF-to-RF circuit block. | 07-04-2013 |
20130170582 | Interpolation of Filter Coefficients - The frequency response of a digital filter, such as a pre-emphasis filter in a signal transmitter having a phase-locked loop, is adjusted using interpolation of the filter coefficients, enabling sets of filter coefficients to be pre-computed or generated as needed in the transmitter. The phase error behavior of the digital filter can be significantly improved. | 07-04-2013 |
20130177106 | MULTIPLE FUNCTIONAL EQUIVALENCE DIGITAL COMMUNICATIONS INTERFACE - A multiple functional equivalence digital communications interface and a group of functional circuits are disclosed. The multiple functional equivalence digital communications interface presents a functional equivalence of each of a group of digital communications interfaces to a digital communications bus. Each functional equivalence of the group of digital communications interfaces is associated with a corresponding one of the group of functional circuits. | 07-11-2013 |
20130182794 | ANTENNA DEVICE AND METHOD IN A MIMO SYSTEM - The invention relates to the technical field of radio communications, and in particular to an antenna device for a radio base station, and a method of operating an antenna device in a Multiple-Input Multiple-Output system. Embodiments of the invention disclose a secondary precoder ( | 07-18-2013 |
20130195219 | MOBILE WIRELESS COMMUNICATIONS DEVICE WITH SELECTIVE POWER AMPLIFIER CONTROL AND RELATED METHODS - A mobile wireless communications device may include a processor, a modulator coupled downstream from the processor, a power amplifier coupled downstream from the modulator and having a control voltage input, an antenna coupled downstream from the power amplifier, and a feedback path coupled between the antenna and the processor. The processor may be coupled to the control voltage input of the power amplifier, and may be configured to determine an adjacent channel leakage value based upon the feedback path and to selectively set a control voltage for the power amplifier based upon the adjacent channel leakage value. | 08-01-2013 |
20130195220 | POWER AMPLIFIER DIGITAL PREDISTORTION SYSTEM FOR CONCURRENT DUAL BAND INPUTS - A method and system for pre-distorting dual band signals to compensate for distortion of a non-linear power amplifier in a radio transmitter are disclosed. According to one embodiment, a first signal in a first frequency band and a second signal in a second frequency band are pre-distorted according to first and second pre-distortion function, respectively, the first and second pre-distortion functions being the dual of one another. | 08-01-2013 |
20130195221 | SIGNAL PROCESSING SYSTEM AND SIGNAL PROCESSING METHOD - A signal processing system is provided. The signal processing system includes: a peak-to-average ratio (PAPR) reducer that reduces a peak-to-average ratio (PAPR) of an input signal x(n), a clipping noise processing system that generates an equivalent clipping noise signal ε* | 08-01-2013 |
20130208827 | METHOD AND APPARATUS TO USE AUXILIARY RECEIVER TO COMPENSATE MULTIPLE TRANSMITTERS BASED UPON ONE OF THE TRANSMITTERS - A communications device includes a plurality of wireless transmitters operable at different respective frequencies and each configured to generate respective IQ signals having an initial IQ imbalance. An auxiliary receiver is coupled to a given wireless transmitter. In addition, a controller is configured to apply predistortion to the each wireless transmitter of the plurality thereof based upon the initial IQ imbalance generated by the given wireless transmitter to reduce the initial IQ imbalance in each wireless transmitter. | 08-15-2013 |
20130216000 | METHOD AND APPARATUS FOR CONTROLLING A TRANSMIT POWER - An apparatus and a method are described which determine a maximum power reduction metric based on a comparison between a magnitude of at least one data channel and a magnitude of at least one control channel. A transmit power, for example of a user equipment, is controlled based on the determined maximum power reduction metric. | 08-22-2013 |
20130223565 | Transmitter Linearized Using Look-Up Table With Unadaptable Data and Method Therefor - A transmitter ( | 08-29-2013 |
20130235953 | Wideband Power Efficient High Transmission Power Radio Frequency (RF) Transmitter - Embodiments provide transmitter topologies that improve the power efficiency and bandwidth of RF transmitters for high transmission power applications. In an embodiment, the common-emitter/source PA of conventional topologies is replaced with a current-input common-base/gate PA, which is stacked on top on an open-collector/drain current-output transmitter. The common-base/gate PA protects the output of the transmitter from large output voltage swings. The low input impedance of the common-base/gate PA makes the PA less susceptible to frequency roll-off, even in the presence of large parasitic capacitance produced by the transmitter. At the same time, the low input impedance of the common-base/gate PA reduces the voltage swing at the transmitter output and prevents the transmitter output from being compressed or modulated, In an embodiment, the DC output current of the transmitter is reused to bias the PA, which results in power savings compared to conventional transmitter topologies. | 09-12-2013 |
20130235954 | Transmitter Gain Control and Calibration - Embodiments provide improved systems and methods of gain control and calibration for wireless transmitters. In particular, embodiments allow linear gain control over the entire transmitter gain control range, independent of temperature/process variations. Embodiments require very low power consumption compared to existing approaches. Embodiments may also be used for gain control calibration during production time, thereby substantially reducing production calibration time and cost. | 09-12-2013 |
20130243120 | ASK MODULATOR AND TRANSMITTER HAVING THE SAME - A modulator which has a first terminal to receive a carrier signal, a second terminal to receive a first control signal to control a frequency band of the carrier signal and a third terminal to receive a second control signal to control a modulation depth of the carrier signal. | 09-19-2013 |
20130243121 | BANDPASS SAMPLING SCHEMES FOR OBSERVATION RECEIVER FOR USE IN PA DPD SYSTEM FOR CONCURRENT MULTI-BAND SIGNALS - The present disclosure relates to an undersampling observation receiver for use in a power amplifier digital predistortion system for concurrent multi-band signals. In one embodiment, an undersampling observation receiver receives a concurrent multi-band signal output by a power amplifier. The concurrent multi-band output signal includes multiple original frequency bands. The | 09-19-2013 |
20130243122 | ARCHITECTURE AND THE TRAINING METHOD OF A PA DPD SYSTEM WITH SPACE MAPPING APPLIED IN THE PREDISTORTER - Systems and methods are disclosed for compensating for non-linearity of a power amplifier using space mapping based predistortion. In one embodiment, a transmitter includes a power amplifier that amplifies a power amplifier input signal, a predistorter that effects predistortion of the power amplifier input signal to compensate for a non-linear characteristic of the power amplifier using a space mapping based model of an inverse of the non-linear characteristic of the power amplifier, and an adaptation sub-system that adaptively configures the space mapping based model of the non-linear characteristic of the power amplifier. In one embodiment, the adaptation sub-system adaptively configures a space mapping based model of the non-linear characteristic of the power amplifier and adaptively configures the space mapping based model of the inverse of the non-linear characteristic of the power amplifier based on the space mapping based model of the non-linear characteristic of the power amplifier. | 09-19-2013 |
20130243123 | LOOK UP TABLE-BASED SUM PREDISTORTER FOR POWER AMPLIFIFICATION WITH CONCURRENT DUAL BAND INPUTS - A method and system for pre-distorting a dual band signal to compensate for distortion of a non-linear power amplifier in a radio transmitter are disclosed. In one embodiment, the first signal of the dual band signal is tuned to a first intermediate frequency to produce a first tuned signal and the second signal of the dual band signal is tuned to minus the intermediate frequency to produce a second tuned signal. A single input pre-distorter pre-distorts the sum of the first tuned signal and the second tuned signal. The coefficients of the pre-distorter are obtained from a one-dimensional look-up table. | 09-19-2013 |
20130243124 | SYSTEM AND METHOD FOR DIGITAL MEMORIZED PREDISTORTION FOR WIRELESS COMMUNICATION - An embodiment of the invention is a system for signal processing in preparation for wireless transmission, the wireless transmission being from a portable wireless communication device and including use of a power amplifier having nonlinear characteristics. The system includes memory for storing digitally-indexed information. The digitally-indexed information models nonlinear characteristics of the power amplifier, and the digitally-indexed information is stored prior to processing of a first signal that reflects information to be communicated. The system further includes first logic, configured to accept the first signal and to retrieve, based on the first signal, a portion of the digitally-indexed information stored in the memory, and second logic, configured to generate a second signal based on the portion of the digitally-accessed information and on the first signal. The second signal pre-compensates for the nonlinear characteristics of the power amplifier, and the second signal is for wireless transmission based on the second signal. | 09-19-2013 |
20130243125 | TRANSMISSION APPARATUS AND TRANSMISSION METHOD - A transmission apparatus includes a signal processing unit to perform a distortion compensation process on a transmitting signal based on a distortion compensation coefficient, and an updating unit to update a transmission power of the transmitting signal subjected to the distortion compensation process in certain processes, to transmit the transmitting signal at the updated transmission power. The signal processing unit may set a referring range of the distortion compensation coefficient stored in a storage unit, based on the transmitting signal before performing the distortion compensation process and the transmitting signal having the transmission power thereof updated by the updating unit. | 09-19-2013 |
20130251066 | MULTI-BAND WIDE BAND POWER AMPLIFIER DIGITAL PREDISTORTION SYSTEM - A high performance and cost effective method of RF-digital hybrid mode power amplifier systems with high linearity and high efficiency for multi-frequency band wideband communication system applications is disclosed. The present disclosure enables a power amplifier system to be field reconfigurable and support multiple operating frequency bands on the same PA system over a very wide bandwidth. In addition, the present invention supports multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. | 09-26-2013 |
20130259159 | TRANSMITTER LINEARIZED IN RESPONSE TO DERIVATIVE SIGNAL AND METHOD THEREFOR - A transmitter ( | 10-03-2013 |
20130279629 | TRANSMITTER - A transmitter for transmitting data symbols using an orthogonal frequency division multiplexing (OFDM) scheme, the transmitter comprising: a modulator for generating a plurality of mutually orthogonal sub-carriers, each of the plurality of sub-carriers being modulated with a stream of data symbols to be transmitted; an amplifier for amplifying a signal containing the plurality of modulated sub-carriers for transmission of the signal; and a symbol processor for processing the data symbols of the plurality of sub-carriers, the symbol processor being configured to compute a plurality of EVM values for each data symbol to be transmitted, each of the plurality of EVM values being computed based on a different one of a plurality of candidate back-off values for the amplifier, and to select one of the plurality of candidate back-off values to apply to the transmitter for the data symbol based on the computed EVM values | 10-24-2013 |
20130279630 | CIRCUIT AND TRANSMITTER FOR REDUCING TRANSMITTER GAIN ASYMMETRY VARIATION - The present invention provides for a circuit with slicing wherein a gain asymmetry variation is decreased across the plurality of mixer slices. In one or more embodiments, a calibration unit can be provided to determine the characteristics of gain asymmetry variation; and a digital compensation unit can be provided to adjust the gain of the circuit over frequency. | 10-24-2013 |
20130301753 | CIRCUIT DEVICE AND ELECTRONIC APPARATUS - A circuit device includes a communication circuit that includes at least one of a reception circuit and a transmission circuit, and an adjustment signal generating circuit that outputs an adjustment signal which adjusts a transconductance of an adjustment target circuit included in the communication circuit. The adjustment signal generating circuit performs a generation process of the adjustment signal, accumulates charge corresponding to the generated adjustment signal in a capacitor, and outputs the adjustment signal based on the charge accumulated in the capacitor to the adjustment target circuit. | 11-14-2013 |
20130315344 | RF TRANSMITTER AND METHOD OF OPERATION - A linear RF transmitter ( | 11-28-2013 |
20130315345 | MOBILE WIRELESS COMMUNICATIONS DEVICE WITH SEPARATE IN-PHASE (I) AND QUADRATURE (Q) PHASE POWER AMPLIFICATION AND POWER AMPLIFIER PRE-DISTORTION AND IQ BALANCE COMPENSATION - A communications device, in one aspect as a portable wireless communications device, includes an in-phase modulator and power amplifier that receives a baseband I signal and modulates and amplifies the I signal. A quadrature modulator and power amplifier receives a baseband Q signal and modulates and amplifies the Q signal. A power combiner sums and outputs the I and Q signals. An I demodulator circuit receives a signal fed back from the I power amplifier and demodulates the fed back signal to produce demodulated I signals. A Q demodulator circuit receives a signal fed back from the Q power amplifier and demodulates the fed back signal to produce demodulated Q signals. A processor compares the digital, baseband I and Q signals with a demodulated I and Q signals to compensate for amplitude, frequency and phase modulation errors. | 11-28-2013 |
20130329833 | Modeling Digital Predistorter - Methods and apparatus are disclosed for predistorting an input signal to compensate for non-linear distortions introduced by an electronic device, for example, a power amplifier. The non-linear effects of a power amplifier can be modeled using different behavior models. Coefficients for one behavior model can be converted into coefficients for a different behavior model using a conversion function. A conversion circuit implementing the conversion function can be used in between a predistorter and an adaptation circuit that use different models. | 12-12-2013 |
20130336422 | Method for calibrating a linearizer and linearized electronic component - Method for calibrating a linearizer and linearized electronic component The method comprises predistortion, in a predistortion linearizer, of a signal upstream of an electronic component to compensate nonlinear distortion. Determining predistortion setting parameters comprises applying a bifrequency test signal to the component and measuring the relative amplitudes of the lines at the output of the component. A variable indicative of the magnitude |K | 12-19-2013 |
20130343483 | Predistortion According to an Artificial Neural Network (ANN)-based Model - Embodiments include a method for predistorting an input signal at a predistorter to compensate for distortion introduced by a non-linear electronic device operating on the input signal to produce an output signal. The method entails generating first and second signal samples for each of a plurality of sampling time instances. The first and second signal samples represent the input and output signals, and are spaced at unit-delay intervals. The method further entails calculating, from the first and second signal samples, parameters for an ANN-based model. The ANN-based model includes a tapped delay line configured to dynamically model memory effects of the distortion introduced by the device, or of the response of the predistorter, with a multi-unit delay interval between at least one pair of adjacent delays. The method also includes predistorting the input signal according to the ANN-based model, to produce a predistorted input signal for input to the device. | 12-26-2013 |
20130343484 | DISTORTION COMPENSATION CIRCUIT, AND TRANSMISSION DEVICE USING DISTORTION COMPENSATION CIRCUIT AND HIGH-FREQUENCY POWER AMPLIFIER - In order to shorten the convergence time for compensating distortion generated by a high-frequency power amplifier, a distortion compensation circuit which independently generates coefficients of odd-symmetrical amplitude distortion compensation signals and coefficients of odd-symmetrical phase distortion compensation signals of respective orders of a high-frequency power amplifier includes an even-symmetrical distortion compensation signal generation circuit for generating an even-symmetrical amplitude distortion compensation signal and an even-symmetrical phase distortion compensation signal from a difference between the input signal amplitude and a signal obtained by delaying the input signal amplitude and a difference between the input signal and a signal obtained by delaying the input signal, respectively independently and independently of the odd-symmetrical distortion compensation signals, and an even-symmetrical distortion compensation signal superposition circuit for superposing the even-symmetrical distortion compensation signals on the input signal, and conducts pre-compensation on odd-symmetrical distortion and even-symmetrical distortion independently. | 12-26-2013 |
20140003553 | PREDISTORTION APPARATUS FOR POWER AMPLIFIER | 01-02-2014 |
20140003554 | DISTORTION COMPENSATING DEVICE AND DISTORTION COMPENSATING METHOD | 01-02-2014 |
20140016725 | METHOD FOR PRE-DISTORTING AND A PRE-DISTORTER - The present invention discloses a pre-distorter, which comprises: a pre-distortion module, which is configured to pre-distort a plurality of baseband input signals by an equal number of pre-distortion functions to obtain equal number of pre-distorted signals respectively, wherein all of the baseband input signals input into every pre-distortion function, and each pre-distortion function has one output; an adder, which is configured to combine all of the pre-distorted signals output from every pre-distortion functions into one combined signal; and a power amplifier (PA), which is configure to amplify the combined signal, wherein the cascade of the pre-distortion functions and the PA are linear overall. And the present invention also discloses a method for distorting. The present invention reduces the implementation cost of a pre-distorer. | 01-16-2014 |
20140029694 | SIGNAL TRANSMITTING DEVICE AND SIGNAL TRANSMITTING METHOD - A signal transmitting device includes: a signal processing circuit arranged to process an input signal to generate a processed input signal according to a compensating signal; a signal converting circuit arranged to convert the processed input signal to generate an output signal according to an oscillating signal; and an arithmetic circuit arranged to generate the compensating signal according to the power of a predetermined component in the output signal, wherein the signal processing circuit uses the compensating signal to update the input signal, and the signal converting circuit converts the updated input signal to reduce the power of the predetermined component in the output signal. | 01-30-2014 |
20140044215 | Block-Based Crest Factor Reduction - A method and apparatus for a radio base station ( | 02-13-2014 |
20140044216 | Method, System, and Apparatus for RF Switching Amplifier - Embodiments of RF switching amplifiers are described generally herein. Other embodiments may be described and claimed. | 02-13-2014 |
20140064405 | METHOD AND APPARATUS FOR OUT-OF-CHANNEL EMISSION SUPPRESSION - A wireless communication device is provided that is capable of suppressing out-of-channel emissions. The wireless communication device includes an upsampled broadband multicarrier signal generator and multiple upsampled sidelobe signal generators. The upsampled broadband multicarrier signal generator receives a symbol stream and, based on the symbol stream, generates a broadband multicarrier signal comprising an in-channel signal and a first multiple out-of-channel sidelobes. Each upsampled sidelobe signal generator of the multiple upsampled sidelobe signal generators receives at least a portion of the symbol stream and, based on at least a portion of the symbol stream, generates an out-of-channel sidelobes to produce a second multiple out-of-channel sidelobes. The wireless communication device further includes a combiner that combines the broadband multicarrier signal and the second multiple out-of-channel sidelobes to at least partially suppress first multiple out-of-channel sidelobes of the broadband multicarrier signal. | 03-06-2014 |
20140064406 | AMPLIFIER CIRCUIT AND WIRELESS COMMUNICATION EQUIPMENT - A quadrature modulation error is compensated without providing an additional feedback loop for detecting quadrature modulation error. An amplifier circuit includes: a quadrature modulator; an amplifier that amplifies a quadrature-modulated signal; a distortion compensation section that compensates distortion to be caused in the amplifier based on first compensation coefficients; a quadrature modulation error compensation section that compensates for a quadrature modulation error; an updating section that updates second compensation coefficients for compensating the quadrature modulation error; an error estimation section that estimates an error of the quadrature modulation error; and a prediction section that calculates a prediction value of an output of the amplifier after updating of the second compensation coefficients. The second compensation coefficients are updated based on the estimated error. The prediction value is calculated based on the estimated error and the amplifier output. The distortion compensation section calculates the first compensation coefficient, based on the prediction value. | 03-06-2014 |
20140072075 | DYNAMIC DIGITAL PRE-DISTORTION SYSTEM - A Dynamic Digital Pre-Distortion (DDPD) system is disclosed to rapidly correct power amplifier (PA) non-linearity and memory effects. To perform pre-distortion, a DDPD engine predistorts an input signal in order to cancel PA nonlinearities as the signal is amplified by the PA. The DDPD engine is implemented as a composite of one linear filter and N−1 high order term linear filters. The bank of linear filters have programmable complex coefficients. To compute the coefficients, samples from the transmit path and a feedback path are captured, and covariance matrices A and B are computed using optimized hardware. After the covariance matrices are computed, Gaussian elimination processing may be employed to compute the coefficients. Mathematical and hardware optimizations may be employed to simplify and reduce the number of multiplication operands and other operations, which can enable the DDPD system to fit within a single chip. | 03-13-2014 |
20140079153 | HIGH EFFICIENCY, REMOTELY RECONFIGURABLE REMOTE RADIO HEAD UNIT SYSTEM AND METHOD FOR WIRELESS COMMUNICATIONS - A remote radio head unit (RRU) system is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier inside the RRU. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by a wideband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, embodiments of the present invention can compensate for the nonlinearities as well as memory effects of the power amplifier systems and also improve performance, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers, multi-frequency bands and multi-channels. Consequentially, the remote radio head system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems. | 03-20-2014 |
20140086361 | PROCESSOR HAVING INSTRUCTION SET WITH USER-DEFINED NON-LINEAR FUNCTIONS FOR DIGITAL PRE-DISTORTION (DPD) AND OTHER NON-LINEAR APPLICATIONS - A processor is provided having an instruction set with user-defined non-linear functions for digital pre-distortion (DPD) and other non-linear applications. A signal processing function, such as DPD, is implemented in software by obtaining at least one software instruction that performs at least one non-linear function for an input value, x, wherein the at least one non-linear function comprises at least one user-specified parameter; in response to at least one of the software instructions for at least one non-linear function having at least one user-specified parameter, performing the following steps: invoking at least one functional unit that implements the at least one software instruction to apply the non-linear function to the input value, x; and generating an output corresponding to the non-linear function for the input value, x. The user-specified parameter can optionally be loaded from memory into at least one register. | 03-27-2014 |
20140098906 | TRANSMIT DIVERSITY ARCHITECTURE WITH OPTIMIZED POWER CONSUMPTION AND AREA FOR UMTS & LTE SYSTEMS - A method and apparatus for providing total power from one transmit path. The method provides the steps of: selecting a transmit path and closing a first switch, located after a digital to analog converter. A second switch between the two transmit paths is then closed in order to provide for the use of at least one low-pass filter in each transmit path. The signal is then processed through the at least one low pass filter in each transmit path. The signal is then processed through at least one mixer in each transmit path. After the mixer, the signal is then processed through at least one driver amplifier in each transmit path, and one-half of the total power is allocated to each of two transmission paths. A third switch is then closed after the at least one power amplifier in each transmit path to force the half-power from one transmit path into one output. | 04-10-2014 |
20140105327 | METHOD AND APPARATUS FOR PREDICTING SIGNAL CHARACTERISTICS FOR A NONLINEAR POWER AMPLIFIER - Aspects disclosed herein relate to predicting one or more signal characteristics to improve efficiency for a PA. A wireless communications device may be include a power amplifier and a processor that is associated with a signal prediction module. In an aspect, the processor may be a modem, a RF chip, etc. In one example, the wireless communications device may be configured to buffer one or more values associated with an input signal. The signal prediction module may be configured to predict a system response to at least a portion of the one or more buffered values, and generate a switcher control signal based on the system response. The signal prediction module may also generate a predicted supply voltage from the values associated with the input signal. | 04-17-2014 |
20140112414 | POWER AMPLIFIER AND THE RELATED POWER AMPLIFYING METHOD - A power amplifier includes: a plurality of amplifying stages arranged to generate an output signal at an output terminal according to a phase-modulated signal and a plurality of amplitude-modulated signals, where each amplifying stage is arranged to receive the phase-modulated signal and one of the plurality of amplitude-modulated signals; an inductive circuit coupled between the output terminal and a first reference voltage; a matching circuit coupled between the output terminal and a loading circuit for providing a matching impedance between the output terminal and the loading circuit; and a capacitive circuit coupled to the output terminal for providing an adjustable capacitance to adjust a loading capacitance at the output terminal according to an adjusting signal; wherein the adjusting signal is indicative of a power of the output signal. | 04-24-2014 |
20140133602 | Digital Pre-Distortion of Non-Linear Systems with Reduced Bandwidth Feedback - Embodiments of the invention provide a DPD system where the transmit reference signal is transformed, including sub-sampling, frequency translation, and the like, to match the feedback signal, which goes thru a similar transformation process, to obtain an error signal. The same transformation is applied to a system model, which may be Jacobian, Hessian, Gradient, or the like, in an adaptation algorithm to minimize error. | 05-15-2014 |
20140146917 | TRANSMITTER WITH PRE-DISTORTION MODULE, A METHOD THEREOF - Aspects of the disclosure provide a transmitter that includes a pre-distortion module and a phase controller. The pre-distortion module is configured to receive a first digital value and generate a first pre-distorted digital value based on the first digital value and a corresponding angle. The first digital value is a combination of an in-phase component and a quadrature component of a signal for transmission. The phase controller is configured to control an amplifier to drive a current according to the first pre-distorted digital value and phase information in relation to the first digital value during a first phase range of a carrier signal determined at least partially based on the angle. | 05-29-2014 |
20140146918 | Detection and Mitigation of an Abnormal Signal Condition Within a Power Amplifier (PA) - A transmitter module of the present disclosure can detect for a presence of an abnormal signal condition, such as a frequency transient within a signal of the transmitter module which can damage the transmitter module, a signal within the transmitter module being at a sufficient power level which can damage the transmitter module, and/or a signal within the transmitter module being at a power level for a sufficient duration which can damage the transmitter module to provide some examples. Once the abnormal signal condition has been detected by the transmitter module, the transmitter module can mitigate effects of the abnormal signal condition to prevent damage within the transmitter module. The transmitter module can adjust an operating characteristic of a module within the transmitter module and/or a signal characteristic of a signal within the transmitter module to mitigate the effects of the abnormal signal condition. | 05-29-2014 |
20140146919 | HIGH EFFICIENCY ADAPTIVE RF TRANSMITTER - One embodiment of the present invention provides a system for controlling operations of an amplifier in a wireless transmitter. During operation, the system receives a baseband signal to be transmitted, and dynamically switches an operation mode of the amplifier between a high power back-off mode having a first power back-off factor and a normal mode having a second power back-off factor based on a level of the baseband signal. | 05-29-2014 |
20140153670 | ELECTRONIC SYSTEM, RF POWER AMPLIFIER AND TEMPERATURE COMPENSATION METHOD THEREOF - A radio frequency (RF) power amplifier is disclosed. The RF power amplifier includes an adder circuit, an output-stage circuit and a differential circuit. The adder circuit has a first ratio and a second ratio, and receives a reference voltage and a feedback voltage so as to output an adder voltage after an operation, wherein the feedback voltage is a voltage with a negative temperature coefficient, and the reference voltage is sum of a first voltage with a negative temperature coefficient and a second voltage with positive temperature coefficient. The output-stage circuit is used for providing the feedback voltage. The differential circuit has a first multiplier factor, and the differential circuit makes the first multiplier factor be multiplied with the adder voltage so as to provide a voltage to the output-stage circuit. The RF power amplifier stabilizes an output current through adjusting the temperature coefficient of the reference voltage. | 06-05-2014 |
20140161207 | DIGITAL PRE-DISTORTION SYSTEM FOR RADIO FREQUENCY TRANSMITTERS WITH REDUCED SAMPLING RATE IN OBSERVATION LOOP - A system includes a digital to analog converter, a power amplifier, an analog-to-digital converter, a filter, and a pre-distortion module. The digital to analog converter generates analog data based on digital data. The power amplifier generates output data based on the analog data. The analog-to-digital converter generates samples based on the output data at a sampling rate less than a Nyquist sampling rate. The filter filters the digital data and generates filtered data. The pre-distortion module distorts the digital data based on the samples and the filtered data to compensate for distortion generated by the power amplifier. | 06-12-2014 |
20140161208 | APPARATUS AND METHOD FOR DC OFFSET CALIBRATION IN SIGNAL TRANSMISSION DEVICE - An apparatus and a method for Direct Current (DC) offset calibration in a signal transmission device of a wireless communication system are provided. The apparatus includes a first DC calibration unit for removing a DC offset from a signal, which is output from a Current-to-Voltage Converter (IVC), by using a first DC calibration value, a Variable Gain Amplifier (VGA) for amplifying the signal output from the IVC, a second DC calibration unit for removing a DC offset from a signal output from the VGA by using a second DC calibration value, a Low Pass Filter (LPF) for filtering the signal output from the VGA, a third DC calibration unit for removing a DC offset from a signal output from the LPF by using a third DC calibration value, and a controller for determining the first DC calibration value, the second DC calibration value and the third DC calibration value. | 06-12-2014 |
20140177755 | RF TRANSMITTER, INTEGRATED CIRCUIT DEVICE, WIRELESS COMMUNICATION UNIT AND METHOD THEREFOR - A radio frequency (RF) transmitter includes a power amplifier comprising a plurality of power amplifier cells. At least one digital signal processing module of the RF transmitter is operably coupled to the power amplifier and comprises at least one digital pre-distortion component arranged to apply at least one digital pre-distortion codeword to the plurality of power amplifier cells, wherein the at least one digital pre-distortion codeword is applied to at least one of the plurality of power amplifier cells via a digital filter. A combiner is arranged to combine outputs of the plurality of power amplifier cells thereby generating an analogue RF signal for transmission over an RF interface based at least partly on the digitally filtered at least one digital pre-distortion codeword. | 06-26-2014 |
20140185707 | Circuit arrangement for compensating for a damping occurring in an antenna line between a mobile radio terminal and an antenna - A circuit arrangement ( | 07-03-2014 |
20140192925 | METHOD OF AND APPARATUS FOR REDUCING PAPR IN FILTER-BANK MULTI-CARRIER SYSTEM - The invention relates to a method of reducing Peak-to-Average. Power Ratio in a transmitting device of a filter-hank multi-carrier system, which includes the steps of: performing constellation modulation ( | 07-10-2014 |
20140198879 | Transmitter - Embodiments provide methods, apparatus and computer software for use in calibrating a transmitter in operative association with a variable supply voltage. A phase distortion of the power amplifier is determined for a given instantaneous power. On the basis of the determined phase distortion for the power amplifier at the given instantaneous power, the transmitter is calibrated. Examples of transmitters in respect of which embodiments may be practised include envelope tracking transmitters, envelope elimination and restoration transmitters, and polar transmitters. | 07-17-2014 |
20140211886 | ALL-DIGITAL MULTI-STANDARD TRANSMITTER ARCHITECTURE USING DELTA-SIGMA MODULATORS - The present disclosure is concerned with a digital transmitter using Delta-Sigma modulators (DMSs) that uses an up-sampler and modulator block that follows the DSMs to generate the RF equivalent of the baseband signal to be transmitted. The up-sampler and modulator block is simple to implement and contains only one or a few multiplexers implemented in high speed logic technology. | 07-31-2014 |
20140219391 | HIGH DYNAMIC RANGE AMAM PREDISTORTION - A predistortion function is evaluated with in-phase (I) and quadrature (Q) data words as arguments, while additive I and Q data words are generated in accordance with a comparison of the I and Q data words with a full scale value that generates maximum current in a digital power amplifier. The additive I and Q data words are added to the computed I and Q data words to produce predistorted I and Q data words. The predistorted I and Q data words are provided in a sequence to the digital power amplifier, which generates a corresponding radio-frequency (RF) analog signal. | 08-07-2014 |
20140219392 | Method And Device For Acquiring Multi-Frequency Band Digital Predistortion Output Signals - The present invention relates to the communications field, discloses a method and device for acquiring multi-frequency band digital predistortion (DPD) output signals, enables the result of DPD processing to compensate the intermodulation of multi-frequency band signal combinations after PA, and improves the ACLR of the signals after PA. Specifically, when performing DPD processing on an input signal received on a working frequency band, reference must be made to the DPD coefficients generated from the feedback signals of the signals previously received on the working frequency band and on other working frequency bands, and to the input signals currently received on other working frequency bands. In other words, intermodulation between the input signals received on working frequency bands are taken into consideration during the DPD processing work flow, so that the result of DPD processing can compensate the intermodulation of the multi-frequency band signal combinations after PA, and improves the accuracy of DPD processing, thereby enhancing the ACLR after wide band power amplification. | 08-07-2014 |
20140233675 | Circuit Arrangement for Compensating an Attenuation Occurring in an Antenna Signal Connection Between a Mobile Terminal and an Antenna and Compensation Method for this Purpose - A circuit arrangement ( | 08-21-2014 |
20140233676 | CONTROL METHOD AND EQUIPMENT FOR RADIO-FREQUENCY SIGNAL - The present invention describes a RF signal control method and device that changes the gain attenuation in real time and uses the changed gain attenuation to adjust the RF input signal. The RF signal control method and device also uses determined linear filter parameters for linearity improvement on the digital signal that results from a down-conversion and analog-to-digital converter on the RF input signal. The adjusted and improved signal is output after a digital pre-distortion and power amplification operation. In comparison with existing technologies, the adjusted gain attenuation is used to make adjustment on the RF input signal and improve linearity the RF input signal such that the resulting RF signal has better quality. Thus, the current application improves the linearity effect of a digital pre-distorter and the dynamic effect of a power amplifier for the RF signal, thereby enhancing coverage of the RF output signal. | 08-21-2014 |
20140233677 | METHOD AND EQUIPMENT FOR CONTROLLING RADIO-FREQUENCY SIGNAL - The present invention describes a RF signal control method and device that adjusts the first down-converter gain attenuation and uses the adjusted first down-converter gain attenuation to change the RF signal. The RF signal control method and device also uses a determined linear filter parameter to perform linearity improvement on the digital signal after the RF signal goes through a down-converter and analog-to-digital converter. The RF signal control method and device use an increased up-converter gain attenuation value to correct the RF input signal after digital pre-distortion operation, so that the adjusted and/or improved signals after power amplification have better quality than the RF signal with just a simple analog-to-digital converter and clipping equipment. Thus, the current application improves the linearity effect of digital pre-distortion operation and the dynamic effect of the power amplifier operation, thereby promoting the coverage effect of the RF output signal. | 08-21-2014 |
20140241461 | WIDE BANDWIDTH DIGITAL PREDISTORTION SYSTEM WITH REDUCED SAMPLING RATE - A digital predistortion linearization method is provided for increasing the instantaneous or operational bandwidth for RF power amplifiers employed in wideband communication systems. Embodiments of the present invention provide a method of increasing DPD linearization bandwidth using a feedback filter integrated into existing digital platforms for multi-channel wideband wireless transmitters. An embodiment of the present invention utilizes a DPD feedback signal in conjunction with a low power band-pass filter in the DPD feedback path. | 08-28-2014 |
20140241462 | CIRCUIT AND METHOD FOR ENVELOPE TRACKING AND ENVELOPE-TRACKING TRANSMITTER FOR RADIO-FREQUENCY TRANSMISSION - A method of envelope tracking and an envelope tracking (ET) circuit. One embodiment of the (ET) circuit is for radio frequency (RF) transmission and includes: (1) an amplitude calculator configured to generate an amplitude signal that approximates the amplitude of an input signal, (2) a peak detector configured to take samples of the amplitude signal within a time window and produce an envelope signal that represents an amplitude peak among the samples, and (3) a signal conditioner configured to condition the envelope signal for driving a power supply input stage of a power amplifier operable to amplify and transmit an RF signal based on the input signal. | 08-28-2014 |
20140247904 | Pilot Symbol Generation for Highly-Spectrally-Efficient Communications - A transmitter may be operable to generate a sequence of symbols which may comprise information symbols and one or more pilot symbols. The transmitter may transmit the information symbols at a first power and transmit the one or more pilot symbols at a second power. In instances when a particular performance indicator is below a determined threshold, the first power may be set to a first value and the second power may be set to zero value. In instances when the particular performance indicator is above the determined threshold, the first power may be set to a second value and the second power may be set to a non-zero value. A value of the first power and a value of the second power may be based on an applicable average power limit determined by a communications standard with which the transmitter is to comply. | 09-04-2014 |
20140247905 | SIGNAL PROCESSING CIRCUIT AND METHOD - A signal processing circuit for providing a modulated analog transmit signal on the basis of a digital transmit data signal is disclosed. The signal processing circuit includes one or more digital circuit components and one or more analog circuit components, and is configured to vary a bias voltage or a supply voltage of at least one of the one or more digital circuit components or at least one of the one or more analog circuit components in dependence on a detected or predefined parameter when providing the modulated analog transmit signal. The detected or predefined parameter includes a parametric or environmental condition associated with the signal processing circuit. | 09-04-2014 |
20140247906 | Microwave Predistorted Signal Generating Method and Apparatus - Embodiments of the present invention disclose a microwave predistorted signal generating method and apparatus. A microwave receiver receives a first received signal that has undergone analog-to-digital conversion; performs channel compensation on the first received signal, to obtain a second received signal; estimates a first transmitted signal according to the second received signal, where the first transmitted signal is a transmitted signal of a microwave transmitter before digital-to-analog conversion; performs predistortion coefficient computation according to the second received signal and the first transmitted signal; performs, by using a first-order coefficient obtained through the predistortion coefficient computation, linear distortion compensation on the second received signal that is before the first transmitted signal is estimated; and sends other predistortion coefficients except for the first-order coefficient to the microwave transmitter, so that the microwave transmitter performs non-linearity predistortion on a transmitted signal. | 09-04-2014 |
20140254720 | PA CELL, PA MODULE, WIRELESS COMMUNICATION UNIT, RF TRANSMITTER ARCHITECTURE AND METHOD THEREFOR - A power amplifier cell includes a first input arranged to receive an in-phase control signal, a second input arranged to receive a quadrature control signal, an input stage arranged to output a drive signal based at least partly on the received in-phase and quadrature control signals, and an output stage arranged to receive at an input thereof the drive signal output by the input stage, and to generate an output signal for the power amplifier cell in response to the received drive signal. | 09-11-2014 |
20140269990 | BASEBAND DIGITAL PRE-DISTORTION ARCHITECTURE - An amplifier may include a predistorter receiving an input signal to generate a predistortion signal, a first converter receiving the predistortion signal to generate a preamplified signal, a power amplifier receiving the preamplified signal to generate an output signal based on the preamplified signal and the input signal, and a second converter sampling the output signal to generate a feedback signal. The predistorter may separately and independently generate a predistortion signal component for the in-phase input signal and a predistortion signal component for the quadrature input signal. | 09-18-2014 |
20140269991 | TRANSMIT (TX) INTERFERENCE CANCELLER AND POWER DETECTOR - A method for Tx interference cancellation and power detection in a wireless device is described. A portion of a Tx output signal is down-converted to generate a feedback signal. A reconstructed interference signal and a weight are generated based on the feedback signal. A Tx power level is detected based on the weight. The reconstructed interference signal is subtracted from the Tx output signal. | 09-18-2014 |
20140286454 | DISTORTION COMPENSATION DEVICE AND DISTORTION COMPENSATION DEVICE METHOD - A distortion compensation device includes: a memory configured to store a first and second table, different addresses being assigned to the first and second table respectively, each of the addresses being related to a distortion compensation coefficient to compensate for a non-linear distortion, a first address in the first table and a second address in the second table corresponding to respective first and second ranges of power or amplitude of a transmission signal, and parts of the first and second ranges overlapping each other; and a processor coupled to the memory and configured to: update the respective distortion compensation coefficients related to the first address and the second address simultaneously, in accordance with a single value of the power or the amplitude, and compensate for the non-linear distortion generated by an amplifier amplifying the power of the transmission signal, by using at least one of the first and second table. | 09-25-2014 |
20140294120 | DUAL LOOP DIGITAL PREDISTORTION FOR POWER AMPLIFIERS - A method of predistorting an input signal ( | 10-02-2014 |
20140314181 | Non-Linear Modeling of a Physical System Using Look-Up Table with Polynomial Interpolation - Methods and apparatus are provided for non-linear modeling of a physical system using look-up tables with polynomial interpolation. A non-linear function is evaluated for a complex input value by obtaining at least one look-up table with polynomial interpolation that represents the non-linear function, wherein entries in the look-up table comprise polynomial coefficients of at least degree two for different segments of the non-linear function; obtaining a point from the look-up table that is near a magnitude of the complex input value; and generating a complex output value by evaluating the polynomial coefficients at the point to perform a Taylor Series expansion from said point. The non-linear function characterizes, for example, a power amplifier or an inverse of a power amplifier and the look-up tables can be used, for example, to implement digital pre-distortion. The look-up table can be stored in a memory of a digital processor, and the polynomial interpolation can be performed as part of a user-defined non-linear instruction that takes a complex number as an input, x, and computes Æ’(x). | 10-23-2014 |
20140314182 | Modeling of a Target Volterra Series Using an Orthogonal Parallel Wiener Decomposition - Improved techniques are provided for modeling a target Volterra series using an orthogonal parallel Weiner decomposition. A target Volterra Series is modeled by obtaining the target Volterra Series V comprised of a plurality of terms up to degree K; providing a parallel Wiener decomposition representing the target Volterra Series V, wherein the parallel Wiener decomposition is comprised of a plurality of linear filters in series with at least one corresponding static non-linear function, wherein an input signal is applied to the plurality of linear filters and wherein outputs of the non-linear functions are linearly combined to produce an output of the parallel Wiener decomposition; computing a matrix C. for a given degree up to the degree K, wherein a given row of the matrix C corresponds to one of the linear filters and is obtained by enumerating monomial cross-products of coefficients of the corresponding linear filter for the given degree; and determining filter coefficients for at least one of the plurality of linear filters, such that the rows of the matrix C are linearly independent. | 10-23-2014 |
20140321576 | TRANSMITTER DIVERSITY WITH A PASSIVE MIXER NETWORK - A transmitter circuit with a passive mixer network includes a first outbound signal path configured to carry a first outbound signal. The transmitter circuit includes a second outbound signal path configured to carry a second outbound signal. The transmitter circuit includes N passive mixers coupled to the first and second outbound signal paths and configured to up-convert the first and second outbound signals from a first frequency to a second frequency based on a clock cycle, where N is a positive even integer. The first and second outbound signals are passed through the N passive mixers during each phase of 2*N phases in the clock cycle. The transmitter circuit also includes N radio frequency signal paths coupled to an output of respective ones of the N passive mixers and configured to receive the first and second outbound signals in the second frequency during each phase of the clock cycle. | 10-30-2014 |
20140328433 | APPARATUS AND METHOD FOR ENVELOPING TRACKING CALIBRATION - An apparatus for envelope tracking calibration for use in a wireless communication is provided. The apparatus includes a transmission signal path configured to carry a transmission signal to an antenna. An envelope signal path configured to feed an envelope signal with an envelope tracking power amplifier. A controller is configured to transmit a normal envelope signal being generated in a normal operation mode and measure a first Adjacent Channel Leakage Ratio (ACLR) corresponding to the normal envelope signal. The controller is further configured to transmit a comparison envelope signal being generated in a comparison operation mode and measure a second ACLR corresponding to the comparison envelope signal. The controller is configured to calculate a time misalignment between the transmission signal path and the envelope signal path based on a difference between the first and second ACLRs. | 11-06-2014 |
20140334572 | TRANSMITTER AND TRANSMISSION METHOD - A transmitter is capable of suppressing a PAPR to be low and efficiently amplifying transmit power. The transmitter generates a transmission signal by oversampling a modulated signal, and includes a modulation unit that performs a modulation process on an information sequence and that generates a constant envelope signal and a phase interpolation unit that inserts a predetermined number of signals identical in amplitude to signal points of the constant envelope signal between the signal points so that signal points including original signal points are located equidistantly. | 11-13-2014 |
20140341318 | AVERAGE POWER TRACKING IN A TRANSMITTER - Average Power Tracking (APT) is a technique that can be utilized for vary the supply voltage to a power amplifier (PA) on a timeslot basis in order to reduce power consumption of the PA. Systems and methods are provided for maximizing power savings associated with the PA by utilizing APT in a continuous and aggressive manner. Additionally, the systems and methods can further compensate for variations in temperature, frequency, antenna load, and peak to average power ratio (PAPR) without sacrificing the power savings. | 11-20-2014 |
20140341319 | ENVELOPE TRACKING SYSTEM FOR MIMO - There is disclosed an amplifier arrangement comprising a plurality of amplifiers each arranged to amplify one of a plurality of different input signals, the arrangement comprising an envelope tracking modulator for generating a common power supply voltage for the power amplifiers, and further comprising an envelope selector adapted to receive a plurality of signals representing the envelopes of the plurality of input signals, and adapted to generate an output envelope signal representing the one of the plurality of envelopes having the highest level at a particular time instant as the input signal for the envelope tracking modulator. | 11-20-2014 |
20140348263 | MULTI-BAND RADIO-FREQUENCY DIGITAL PREDISTORTION - Systems and methods for radio frequency digital predistortion in a multi-band transmitter are disclosed. In one embodiment, the multi-band transmitter includes a digital upconversion system configured to digitally upconvert digital input signals to provide digital radio frequency signals. Each digital input signal and thus each digital radio frequency signal corresponds to a different band of a multi-band transmit signal to be transmitted by the multi-band transmitter. The multi-band transmitter also includes a radio frequency digital predistortion system configured to digitally predistort the digital radio frequency signals to provide predistorted digital radio frequency signals, and a combiner configured to combine the predistorted digital radio frequency signals to provide a multi-band predistorted digital radio frequency signal. | 11-27-2014 |
20140348264 | DIGITAL TRANSMITTER AND METHOD FOR CALIBRATING DIGITAL TRANSMITTER - A digital transmitter includes: a plurality of adjustable delay lines arranged to delay a plurality of digital input signals by a plurality of delay times to generate a plurality of delayed digital input signals respectively; a plurality of converting devices arranged to convert the plurality of delayed digital input signals into a plurality of converting signals respectively; and a calibration device arranged to adjust a delay time of at least one adjustable delay line in the plurality of adjustable delay lines to make the plurality of converting devices convert the plurality of delayed digital input signals at respective desire time points. | 11-27-2014 |
20140348265 | DIGITAL TRANSMITTER AND METHOD FOR COMPENSATING MISMATCH IN DIGITAL TRANSMITTER - A digital transmitter includes: a plurality of converting devices arranged to generate a plurality of converting signals according to a plurality of digital input signals; a compensation device arranged to generate at least one compensation signal according to the plurality of digital input signals; and a combining circuit arranged to output an amplified output signal according to the plurality of converting signals and the at least one compensation signal. | 11-27-2014 |
20140348266 | TRANSMISSION APPARATUS AND WIRELESS SIGNAL TRANSMISSION METHOD - RF input signals having mutually different carrier frequencies are input from a signal generator to a power amplifier, the power amplifier amplifying the RF input signals and outputting them as RF output signals. The signal generator has a function for reducing the PAR of the waveform combining the RF input signals. The PAR reduction of the combined waveform of the RF input signals is performed through a control on the transmission timing of the RF input signals via a delay adjuster installed in the signal generator, or through an amplitude constraint on the RF input signals via a limiter installed in the signal generator. In this manner, a transmission device with improved power efficiency is provided. | 11-27-2014 |
20140355714 | CONFIGURABLE PRE-EMPHASIS COMPONENT FOR TRANSMISSION CIRCUITRY - A configurable pre-emphasis filter component may be configured based upon measured frequency response (e.g., filter effect) associated with at least one analog filter positioned between a digital predistortion component and a power amplification component of a transmission circuitry. The frequency response may be measured using a calibration signal sent via the transmission circuitry, a loopback circuit, and a reception circuitry. Calibration circuitry may be used with one or more loopback circuits to measure the frequency response of various analog components of the transmission circuitry. The calibration circuitry may also include logic to determine a configuration for the PEF component based upon the measured frequency response. | 12-04-2014 |
20140355715 | POWER SUPPLY DEVICE, METHOD FOR MANAGING POWER SUPPLY THEREOF AND WIRELESS COMMUNICATION TERMINAL - The present invention provides a power supply device, a method for managing power supply thereof and a wireless communication terminal. The wireless communication terminal includes a baseband working unit, a RF working unit and a DC power converter connected with the baseband working unit and the RF working unit, further including a power supply device, a CPU and an envelope detection device; the power supply device is configured to receive a voltage supplied by the DC power converter, supplying an output voltage to a PA in the RF working unit, receiving a control signal sent from CPU, adjusting the output voltage according to the control signal, so that the output voltage meets the envelope variation curve of the output signal of the PA; the envelope detection device is configured to detect the envelope signal of output signal of the PA in real time and send the envelope signal to the CPU; the CPU is configured to receive the voltage supplied by the DC power converter, convert the envelope signal sent by the envelope detection device into a control signal and send the control signal to the power supply device. With the scheme of the present invention, the power consumption and heat dissipation problems of the PA can be solved. | 12-04-2014 |
20140362951 | CREST FACTOR REDUCTION OF CARRIER AGGREGATED SIGNALS - The present disclosure advantageously provides methods and systems for crest factor reduction of multi-standard carrier aggregated signals. In one embodiment, a method of providing crest factor reduction for a carrier aggregated signal is provided. In one embodiment, the method comprises estimating a peak of a carrier aggregated signal based on a summation of instantaneous amplitudes of baseband representations of a number of component carriers of the carrier aggregated signal. The number of component carriers of the carrier aggregated signal is greater than or equal to 2. The method further comprises clipping the baseband representations of the component carriers if the estimated peak of the carrier aggregated signal is greater than a predefined clipping threshold. | 12-11-2014 |
20140369442 | RECEIVER, TRANSMITTER, FEEDBACK DEVICE, TRANSCEIVER AND SIGNAL PROCESSING METHOD - The present invention provides a receiver, a transmitter, a transmitter feedback device, and corresponding methods. The feedback device includes: a multi-channel frequency selection band-pass circuit, configured to receive a multi-frequency band feedback signal, and output a feedback signal of each frequency band in a time-division manner; a feedback local oscillator, configured to provide feedback local oscillation corresponding to each frequency band in a time-division manner; a mixer, configured to mix the feedback signal of each frequency band from the multi-channel frequency selection band-pass circuit and the feedback local oscillation corresponding to each frequency band from the feedback local oscillator, and output an intermediate frequency signal of each frequency band in a time-division manner. A solution in which only one set of signal processing channels is used to process the signals of multiple frequency bands in the uplink, the downlink or both the uplink and downlink is provided. | 12-18-2014 |
20150010110 | MODULATION AGNOSTIC DIGITAL HYBRID MODE POWER AMPLIFIER SYSTEM AND METHOD - A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available. | 01-08-2015 |
20150016567 | DIGITAL PRE-DISTORTION SYSTEMS IN TRANSMITTERS - Various digital pre-distortion systems for use in transmitters are disclosed. The digital pre-distortion system comprises an observing path, which performs either undersampling or radio frequency sampling of the output of a power amplifier. Undersampling may be performed at a rate, which causes aliasing to occur in the undersampled frequency domain. Both undersampling and radio frequency sampling reduces the complexity of the digital pre-distortion system by removing any down mixing modules or anti-aliasing modules, while maintaining reasonable performance of the digital pre-distortion systems. | 01-15-2015 |
20150016568 | PREAMBLE GENERATING DEVICE, PREAMBLE GENERATING METHOD, AND NON-TRANSITORY COMPUTER-READABLE RECORDING MEDIUM STORING A PROGRAM - A first calculator generates first computational data by multiplying each element in a result obtained by applying a fast Fourier transform to data containing at least one of a real data sequence and an imaginary data sequence with reordered elements by an element of a preamble model at a same position as the each element. A second calculator generates second computational data by performing computation that converts an absolute value of each element in the inverse fast Fourier-transformed first computational data into a value in a predetermined range. A third calculator generates third computational data by multiplying each element in the fast Fourier-transformed second computational data by an element of the preamble model at a same position as the each element. A decider generates the third computational data as a preamble in a case of the PAPR of the inverse fast Fourier-transformed third computational data matching a predetermined criterion. | 01-15-2015 |
20150023451 | PREDISTORTION FACTOR DETERMINATION FOR PREDISTORTION IN POWER AMPLIFIERS - A baseband signal is generated as a sequence of complex sample values at a predetermined sample rate. A sample of the baseband signal is captured as is a sample of an output signal generated by a power amplifier from the captured sample of the baseband signal. Complex values are iteratively assigned to a complex factor intended for predistorting data such that the product of the baseband signal sample and the complex factor converges towards equivalence with the output signal sample with each iterative assignment of the complex values to the complex factor. The complex factor is stored in memory at an address associated with the value of the captured baseband signal sample. | 01-22-2015 |
20150030105 | SUPPRESSION OF SPURIOUS HARMONICS GENERATED IN TX DRIVER AMPLIFIERS - The transmission path of a communication device includes, in part, N upconverters each of which receives M phases of a signal to be transmitted. Each upconverter further receives one of N sets of phases of a LO signal. Each of the N sets includes M phases of the LO signal. The communication device further includes at least one combiner, and N amplifiers each responsive to a different one of the N upconverters to generate N amplified signals. The combiner combines the N amplified signals to generate an output signal. By selecting the gain of one of the amplifiers to be different than the gain of the remaining amplifiers, the undesired harmonics of the signal to be transmitted, caused by non-linearity of the amplifiers, is reduced. Each upconverter optionally includes a multitude of upconverters whose outputs are combined to further reduce the spurious harmonic upconversion products and the counter-intermodulation distortion (IM3). | 01-29-2015 |
20150036766 | LEVEL DE-MULTEPLEXED DELTA SIGMA MODULATOR BASED TRANSMITTER - This specification discloses a level de-multiplexed DSM based transmitter and a method for providing the same. Broadly embodiments of the present specification enable wireless transmitters that are based on multi-level de-multiplexed DSM. A three-level de-multiplexed DSM based transmitter is disclosed as an example. More generally, the use of m-level de-multiplexed DSM is also taught, the specification thereby being enabling for broader applications to a person skilled in the art. At least one of the efficiency and linearity of transmitters can be enhanced as required for specific applications by a person of skill in the art in view of this specification and the teachings of its disclosed embodiments. | 02-05-2015 |
20150043678 | SCALABLE DIGITAL PREDISTORTION SYSTEM - The scalable digital predistortion system provides a behavioral model that can be used to model and compensate for the nonlinear distortions of power amplifiers and transmitters. The predistorter and update algorithms make the model/DPD scalable in terms of signal bandwidth and average power, allowing for low complexity update following changes in the signal's bandwidth and/or power level. Experimental validation carried on a 300 Watt Doherty power amplifier shows that the scalable model and the predistorter architecture achieve performance similar to their conventional counterpart. However, the present model/predistorter requires the update of up to 50% fewer coefficients than the conventional model/predistorter. | 02-12-2015 |
20150043679 | OFDM MODULATED WAVE TRANSMITTER APPARATUS, OFDM MODULATED WAVE TRANSMISSION METHOD, AND PROGRAM - In an orthogonal frequency division multiplex (OFDM) modulated wave transmitter apparatus, a symbol mapping circuit and a serial/parallel (S/P) converter generate an OFDM symbol signal from transmission data. An inverse fast Fourier transform (IFFT) circuit, a parallel/serial (P/S) converting and guard interval (GI) adding circuit, a timing adjusting circuit, a digital/analog (D/A) converter, a frequency converter, a local oscillator and an analog filter generate an OFDM modulated wave signal from the OFDM symbol signal. A power amplifier (PA) control circuit limits a band of the OFDM symbol signal and generates a PS control signal and a PA control signal. A PA designates a voltage supplied from a DC/DC converter as a PS voltage and amplifies and outputs the OFDM modulated wave signal based on the PA control signal. | 02-12-2015 |
20150049840 | DIGITAL-TO-TIME CONVERTER AND METHODS FOR GENERATING PHASE-MODULATED SIGNALS - Embodiments of a digital-to-time converter (DTC) and methods for generating phase-modulated signals are generally described herein. In some embodiments, a divide by 2N+/−1 operation on an oscillator signal generates first and second divider signals, the first divider signal is sampled to provide a rising-edge correlated signal, a divider unit output signal is sampled to provide a falling edge correlated signal, and either the second divider signal or a delayed version of the second divider signal is provided as the divider unit output signal. A selection between the rising-edge and the falling-edge correlated signals generates edge signals. A fine phase-modulated output signal is generated based on an edge interpolation between a first and second edge signals. | 02-19-2015 |
20150049841 | LINEARIZATION OF INTERMODULATION BANDS FOR CONCURRENT DUAL-BAND POWER AMPLIFIERS - Systems and methods are disclosed for digital predistortion for a concurrent multi-band transmitter that compensates for both in-band and out-of-band intermodulation products according to a memory polynomial based baseband model. In one embodiment, a concurrent multi-band transmitter includes a digital predistortion subsystem, power amplifier circuitry, and an adaptation subsystem. The digital predistortion subsystem includes multiple digital predistorters configured to process digital input signals for frequency bands of a concurrent multi-band signal to provide predistorted digital input signals each being for a different one of the frequency bands of the concurrent multi-band signal and one or more intermodulation distortion compensation signals each being for a different one of one or more intermodulation distortion frequency bands. The adaptation subsystem is configured to adaptively configure the plurality of digital predistorters according to a memory polynomial based digital baseband model of the digital predistorters. | 02-19-2015 |
20150049842 | TRANSMITTER AND TRANSMITTING METHOD - A transmitter according to the present invention includes a level detector that detects the level value of an input signal, from among a predetermined number of level values; an upstream-side signal adjusting unit that amplifies said input signal and shifts said input signal for an offset amount based on an output signal of said level detector; a digital-sigma modulator having a quantizer that quantizes an output signal of said upstream-side signal adjusting unit with a predetermined number of bits, and a downstream-side signal adjusting unit that amplifies an output signal of said delta-sigma modulator and shifts the output signal of said delta-sigma modulator for an offset amount based on the output signal of said level detector. | 02-19-2015 |
20150049843 | Combined Transmission Precompensation and Receiver Nonlinearity Mitigation - Circuitry of a transmitter may comprise a predistortion circuit cascaded with a nonlinear circuit. The nonlinear circuit may be characterized by a first response corresponding to a first error vector magnitude. A response of the predistortion circuit may be configured based on the first response of the nonlinear circuit such that a composite response of the predistortion circuit cascaded with the nonlinear circuit differs from the first response and is characterized by a second error vector magnitude that is greater or equal than the first error vector magnitude. The response of the predistortion circuit may be configured based on feedback of an output of the nonlinear circuit. The response of the predistortion circuit may be configured based on parameters received from a receiver partner of the transmitter during connection setup, in preambles, in message headers, and/or in dedicated messages. | 02-19-2015 |
20150055732 | POWER AMPLIFICATION SYSTEM, DEVICE AND METHOD - Embodiments of the present invention may include power amplifier architectures and systems for use in wireless communication systems. The systems may include a first circuit path for receiving an input signal and decomposing the signal into two vector signals using an out-phasing generator, modifying the vectors based on predetermined value limit, amplifying the vectors using power amplifiers, and combining the vectors to provide an amplified output. The system may include a second circuit path for generating an estimate of an envelope of the input signal and using the envelope to modulate the voltage supplies of the power amplifiers when amplifying the vector signals. The system may also include a feedback path for sending information regarding the envelope of the input signal into the out-phasing generator, which may modify the vector signals in response thereto. | 02-26-2015 |
20150055733 | HIGH FREQUENCY CIRCUIT AND HIGH FREQUENCY MODULE INCLUDING THE SAME - A front-end circuit includes a power amplifier circuit, a low noise amplifier circuit, a connection switching circuit, a bypass circuit and an attenuation unit. The connection switching circuit switches connections in response to a control signal. The bypass circuit forms a bypass in response to a control signal. The attenuation unit includes a plurality of attenuation circuits. The plurality of attenuation circuits include attenuation circuits. In the case where an antenna terminal is electrically connected to the power amplifier circuit, the attenuation circuits attenuate a branch signal leaked from the transmission signal into a transfer line for transferring the reception signal in response to the control signal. In the case where the antenna terminal is electrically connected to the low noise amplifier circuit, the attenuation circuit attenuates the reception signal in the transfer line in response to the control signal. | 02-26-2015 |
20150071382 | DIGITAL PRE-DISTORTION TRANSMITTER AND METHOD FOR CONTROLLING THE SAME - The embodiments of the present disclosure provide a digital pre-distortion transmitter and a method for controlling the same, which increase the efficiency of the power amplifier and improve the linearity of the transmitter. The digital pre-distortion transmitter includes: a pre-distortion unit configured to update a pre-distortion coefficient required by pre-distortion processing, and perform the pre-distortion processing on a baseband signal; a signal process and transmit unit configured to perform signal processing on the pre-distortion-processed baseband signal and transmission thereof; and a feedback signal process unit configured to process a feedback signal of the signal transmitted by the signal process and transmit unit, so as to supply a dynamic drain voltage to a power amplifier in the signal process and transmit unit by using the processed feedback signal; wherein, the pre-distortion unit updates the pre-distortion coefficient by using the feedback signal processed by the feedback signal process unit. | 03-12-2015 |
20150071383 | SYSTEMS AND METHODS OF RF POWER TRANSMISSION, MODULATION, AND AMPLIFICATION - An apparatus, system, and method are provided for energy conversion. For example, the apparatus can include a trans-impedance node, a reactive element, and a trans-impedance circuit. The reactive element can be configured to transfer energy to the trans-impedance node. The trans-impedance circuit can be configured to receive one or more control signals and to dynamically adjust an impedance of the trans-impedance node. The trans-impedance node, as a result, can operate as an RF power switching supply based on the one or more control signals. | 03-12-2015 |
20150078482 | TRANSFORMER-BASED RF POWER AMPLIFIER - Various embodiments include a power amplifier having power amplifier cells located in a die, conductive contacts overlying a surface of the die and coupled to the amplifier cells, and conductive lines overlying a surface of the die between the conductive contacts and coupled to the power amplifier cells. Additional apparatus are described. | 03-19-2015 |
20150078483 | APPARATUS AND METHOD FOR FAST LOCAL OSCILLATOR RE-TUNE FOR RESIDUAL SIDE BAND REDUCTION - Various aspects of the present disclosure are directed to apparatuses and methods that can mitigate the undesirable effects of residual side band (RSB) signal by actively re-tuning the local oscillator of a transmitter to be at or near the center frequency of the carrier. Other aspects, embodiments, and features are also claimed and described. | 03-19-2015 |
20150078484 | Predistortion Correction Method, Predistortion Correction Apparatus, Transmitter, and Base Station - A predistortion correction method, a predistortion correction apparatus, a transmitter, and a base station are provided. The method includes: performing, based on a digital predistortion model, non-linear processing on an input transmit signal to obtain higher-order distortion time-domain signals; and obtaining, after performing processing on the higher-order distortion time-domain signals, a predistortion signal to be input to a power amplifier, where a process of converting the higher-order distortion time-domain signals to the predistortion signal includes bandwidth limitation processing, so that the predistortion signal to be input to the power amplifier is a predistortion signal within a preset bandwidth. Embodiments of the present invention can ensure predistortion accuracy, and can also reduce a requirement for a bandwidth and a sampling rate of a feedback channel, thereby reducing a predistortion cost. | 03-19-2015 |
20150078485 | METHOD AND APPARATUS FOR AUTOMATICALLY TUNING AN IMPEDANCE MATRIX, AND RADIO TRANSMITTER USING THIS APPARATUS - The invention relates to a method and an apparatus for automatically tuning an impedance matrix, for instance the impedance matrix seen by the power amplifiers of a radio transmitter using a plurality of antennas simultaneously, and to a radio transmitter using this apparatus. An apparatus for automatically tuning an impedance matrix has 4 user ports and 4 target ports, and comprises: 4 sensing units; a signal processing unit, the signal processing unit estimating real quantities depending on the impedance matrix presented by the user ports, using the sensing unit output signals obtained for 4 different excitations applied successively to the user ports; a multiple-input-port and multiple-output-port tuning unit comprising adjustable impedance devices; and a tuning control unit delivering tuning control signals to the multiple-input-port and multiple-output-port tuning unit, the reactance of each of the adjustable impedance devices being mainly determined by one or more of the tuning control signals. | 03-19-2015 |
20150098523 | APPARATUS AND METHOD FOR POWER AMPLIFICATION - A power amplifying apparatus and a method for effectively controlling a bias voltage of a power amplifier are provided. An electronic device includes a baseband signal processor configured to convert a baseband signal to an envelope signal, a power amplifier configured to amplify a Radio Frequency (RF) signal based on the baseband signal, a power modulator configured to modulate an input voltage to a bias voltage of the power amplifier based on the envelope signal, and a power controller configured to control an operation of the power modulator according to a characteristic of the baseband signal. | 04-09-2015 |
20150098524 | POWER COMBINING POWER AMPLIFIER ARCHITECTURES AND METHODS - Systems and methods are provided for implementing and using multiband transceiver architectures. In a transmit subsystem that comprises a plurality of transmit paths, a frequency spectrum that is used for transmission of signals may be segmented into a plurality of segments, and each of the segments may be allocated to one of the plurality of transmit paths. Further, performance in each of the plurality of transmit paths may be monitored during transmission of signals, and operation of the transmit subsystem and each of the plurality of transmit paths may be controlled based on the monitored performance. Such control may comprise dynamically performing one or more of modifying operation of one or more of the plurality of transmit paths, modifying assignment of plurality of segments to the plurality of transmit paths, and modifying segmentation of the frequency spectrum. | 04-09-2015 |
20150103951 | Transmit Noise and Impedance Change Mitigation in Wired Communication System - A method, system and circuit for providing for part or all of a transmitter, when it is in mute mode (not actively transmitting), to be turned off, removed, decoupled or modified in general in order to reduce the total noise submitted by the transmitter to the wired network into network controller. In parallel, an auxiliary circuit or impedance is added or coupled to the transmitter in order to mitigate the total return loss change of the transmitter. When in active transmitter mode, this auxiliary circuit or impedance will be removed or decoupled from the transmitter and transmitter will transmit in normal mode. | 04-16-2015 |
20150103952 | Digital Predistortion Processing Method and Device - A digital predistortion processing method and device, the method comprises: performing digital predistortion processing on a baseband signal according to a first predistortion correction parameter, converting the baseband signal after digital predistortion processing into a radio-frequency signal, dividing the radio-frequency signal, and respectively outputting each path of radio-frequency signal to a distinct power amplifier; and, coupling and outputting the radio-frequency signal output by each power amplifier to a feedback link for combination to obtain a combined signal, and performing conversion processing on the combined signal; and generating a predistortion correction parameter according to the combined signal after conversion processing and the baseband signal before digital predistortion processing, and updating the first predistortion correction parameter to a second predistortion correction parameter. | 04-16-2015 |
20150103953 | APPARATUS AND METHOD FOR CONTROLLING POWER BASED ON ENERGY EFFICIENCY IN MULTIPLE-INPUT AND MULTIPLE-OUTPUT (MIMO) COMMUNICATION SYSTEM - Provided is an apparatus and method for managing a power consumption of a transmitter based on energy efficiency in a multiple-input and multiple-output (MIMO) communication system. The transmitter is configured to control a power of at least one of a baseband (BB) component, a radio frequency (RF) chain component, and a power amplifier (PA) component based on calculation of the energy efficiency. | 04-16-2015 |
20150103954 | DIGITAL AMPLITUDE MODULATION APPARATUS AND CONTROL METHOD OF DIGITAL AMPLITUDE MODULATION APPARATUS - A digital amplitude modulation apparatus is provided with a measuring section, a fast surge protection section, a slow vector protection section, and a controller. The measuring section detects a voltage and a current from an RF signal. The fast surge protection section calculates an SWR from a detection signal of the measuring section, and obtains a first upper limit of the number of power amplifiers which can be put into an ON state based on the SWR and generates a first control signal. The slow vector protection section obtains a reflection coefficient from the output detection signal of the measuring section, and obtains a second upper limit of the number of the power amplifiers which can be put into an ON state based on the reflection coefficient and generates a second control signal. The controller controls the power amplifiers to be ON/OFF. | 04-16-2015 |
20150103955 | Envelope Path Processing for Envelope Tracking Amplification Stage - The invention relates to a method of calibrating an envelope path and an input path of an amplification stage of an envelope tracking power supply, the method comprising matching the envelope path to at least one characteristic of at least one element of the input path. | 04-16-2015 |
20150110222 | SYSTEM AND METHOD FOR AMPLIFYING A SIGNAL - An amplification system, connected to a modem delivering a signal to be amplified, includes at least one amplification device, at least one first determination device for determination of a first difference and at least one second determination device for determination of a variable gain. Moreover, the system is characterized in that the second determination device is capable of the determination of said variable gain on the basis of said signal to be amplified, said amplified signal and said first difference. | 04-23-2015 |
20150110223 | MULTI-BAND OBSERVATION RECEIVER - Transmitter observation receivers and methods are described that can predistortion-compensate transmitters capable of operating in multiple communication bands and frequency ranges. Such observation receivers and method involve generating at least one compensation signal such that a signal to be transmitted that is within a bandwidth that simultaneously encompasses multiple frequency ranges is compensated. | 04-23-2015 |
20150117566 | METHOD AND SYSTEM FOR MULTI-CHANNEL SIGNAL TRANSMISSION - The present invention discloses a multi-channel signal transmission system and the transmission method thereof. The system comprises a transmitter, a selection device, a compensation device, and power amplifier modules. The transmitter comprises a Ramp Circuit connected to the transmitter and the power amplifier modules respectively. The selection device is configured between the transmitter and the power amplifier modules. The transmission method comprises: selecting a transmission channel by the transmitter for transmitting the signal, the selection device strobes a transmission route between the transmission channel and the power amplifier modules, and based on different transmission power parameters, the Ramp Circuit transmits different control signals to the power amplifier modules to adjust transmission gain of the power amplifier modules. The present invention has the purpose of improving the integration level of the chip and decreasing the board area and the difficulty of wiring. | 04-30-2015 |
20150117567 | CARTESIAN DIGITAL POWER AMPLIFIER USING COORDINATE ROTATION - An apparatus includes first through fourth circuits. The first circuit determines a region of an input signal. The region is one of a plurality of regions. The second circuit generates a rotated input signal by rotating the input signal by a first angle according to the region. The third circuit phase shifts a carrier signal by a second angle according to the region. A fourth circuit amplifies the phase shifted carrier signal according to the rotated input signal. A method comprises determining a region according to a phase angle of an input signal, determining a rotation angle according to the region, generating a rotated carrier signal according to a carrier signal and the rotation angle, generating a rotated input signal according to the input signal and the negative of the rotation angle, and amplifying the rotated carrier signal according to the rotated input signal. | 04-30-2015 |
20150124904 | DISTORTION COMPENSATION APPARATUS, WIRELESS COMMUNICATION SYSTEM, AND DISTORTION COMPENSATION METHOD - A distortion compensation apparatus including: an amplifier configured to amplify an input signal including a transmission signal and an impulse signal, the transmission signal being converted to a radio frequency signal for transmission, the impulse signal being not converted to a radio signal for transmission, a memory configured to store a plurality of distortion compensation coefficients for compensating distortion to the input signal, each of the plurality of distortion compensation coefficients being associated with an amplitude of the input signal, and a processor configured to select a distortion compensation coefficient from the plurality of distortion compensation coefficients based on an amplitude of the impulse signal included in the input signal, and update the selected distortion compensation coefficient based on the amplified impulse signal include in the amplified input signal. | 05-07-2015 |
20150139358 | PRE-DISTORTION IN A WIRELESS TRANSMITTER - Exemplary embodiments are related to digital pre-distortion in envelope tracking systems. A device may include an amplitude modulation-to-phase modulation (AM-PM) distortion unit configured to generate an AM-PM distortion component in response to receipt of phase data of an input transmit signal. The device may also include a local oscillator (LO) path coupled to the distortion unit and configured to convey a local oscillator (LO) signal that varies based on the AM-PM distortion component. | 05-21-2015 |
20150139359 | FREQUENCY SELECTIVE PREDISTORTION - A baseband PA predistortion module, which includes a baseband combiner, a baseband PA correction circuit, and a baseband filter, is disclosed. The baseband PA correction circuit replicates behavior of an RF PA by processing a modulation data signal to provide a predistortion data signal. The behavior of the RF PA includes distortion. The modulation data signal is representative of an RF input signal to an RF PA and the predistortion data signal is representative of a correction needed at an output of the RF PA. The baseband filter receives and filters the predistortion data signal to provide a reduced predistortion data signal, such that a low frequency content of the reduced predistortion data signal is less than a low frequency content of the predistortion data signal. The baseband combiner receives and combines the modulation data signal and the reduced predistortion data signal to provide a baseband transmit signal. | 05-21-2015 |
20150146822 | MULTI-PATH DIGITAL PRE-DISTORTION - An apparatus relates generally to multi-path digital predistortion. In this apparatus, a single-band digital predistorter engine has first and second sample paths. An input stage is coupled to receive input samples and configured to separate them into first samples and second samples. The input stage provides first and second magnitudes for the first and second samples, respectively. A first set of digital predistorters receives the first samples, the first magnitudes and the second magnitudes. A second set of digital predistorters receives the second samples, the second magnitudes and the first magnitudes. An output stage is coupled to receive predistorted outputs from the first set of digital predistorters and the second set of digital predistorters and is configured to provide a digital predistorted composite signal from the first set of digital predistorters and the second set of digital predistorters. | 05-28-2015 |
20150303985 | METHOD, SYSTEM, AND APPARATUS FOR RF SWITCHING AMPLIFIER - Embodiments of RF switching amplifiers are described generally herein. Other embodiments may be described and claimed. | 10-22-2015 |
20150304154 | WIRELESS TRANSMISSION APPARATUS AND DISTORTION COMPENSATION METHOD - A wireless transmission apparatus includes an amplifier that amplifies power of a multicarrier signal, a first frequency shift unit that performs a first frequency shift on a first signal fed back from the amplifier on the basis of carrier frequencies of the multicarrier signal to output a second signal after the first frequency shift, a band limiting unit that performs frequency band limitation on the second signal to output a third signal after the frequency band limitation, and a distortion compensation device that compensates nonlinear distortion of the amplifier on the basis of the third signal. | 10-22-2015 |
20150311869 | AMPLIFIER CIRCUIT AND OPERATION METHOD THEREOF - Disclosed is an amplifier circuit capable of achieving high efficiency at back off power while maintaining high output power when an amplifier of a driving stage is saturated in a multistage amplifier in which a plurality of amplifiers are connected in series to each other. In the amplifier circuit, at least two amplifiers including a first amplifier and a second amplifier, the first amplifier preceding the second the first amplifier, are connected in series to each other, the second amplifier changes input impedance according to output power from the first amplifier, and an impedance adjusting unit for adjusting output load impedance of the first amplifier is disposed between the first amplifier and the second amplifier, wherein the impedance adjusting unit optimizes the output load impedance of the first amplifier according to a change of input impedance of the second amplifier. | 10-29-2015 |
20150311926 | Acquisition of Nonlinearity in Electronic Communication Devices - Circuitry of an electronic transmitter may determine characteristics of nonlinear distortion introduced by the electronic transmitter during transmission of electronic signals onto a communication medium, and transmit a training signal, from which the characteristics of the nonlinear distortion can be recovered, prior to transmitting data onto the communication medium. The circuitry may transmit the training signal as part of a preamble of each burst of data transmitted by the circuitry of the electronic transmitter. The circuitry may transmit the training signal as part of a handshaking protocol used for admission of the electronic transmitter to a network. The circuitry may transmit the training signal in response to a request from receiver. The characteristics of the nonlinear distortion comprise an indication of a type of nonlinear distortion model suited for replicating the nonlinear distortion introduced by the electronic transmitter. | 10-29-2015 |
20150318880 | Digital Pre-Distortion for High Bandwidth Signals - A digital pre-distortion arrangement is disclosed. The arrangement comprises a respective filter bank for each of two or more initial signals to be amplified simultaneously by a non-linear power amplifier, N combiners, N pre-distorters and a multiplexer. Each respective filter bank comprises N interrelated filters. Multiplexed impulse responses of the interrelated filters define an overall filter function comprising a pass band associated with a transmission frequency of the initial signal. Each respective filter bank is configured to filter the respective initial signal in each of the interrelated filters to produce N digital filtered signals. The initial signal and each of the digital filtered signals have sample rate R. Each of the combiners is configured to combine corresponding digital filtered signals of each of the two or more initial signals to produce a composite digital signal having sample rate R. Each of the pre-distorters is configured to apply digital pre-distortion at a processing rate R to a respective one of the composite digital signals to produce a pre-distorted composite digital signal having sample rate R. The multiplexer is configured to multiplex the N pre-distorted composite digital signals to produce a pre-distorted digital signal having a sample rate N times R, wherein the pre-distorted digital signal comprises a signal component of each of the two or more initial signals and N times R is greater or equal to a total bandwidth comprising the transmission frequencies of the two or more initial signals. Corresponding method, transmitter and wireless communication device are also disclosed. | 11-05-2015 |
20150326255 | RADIO FREQUENCY POWER AMPLIFIER INCLUDING A PULSE GENERATOR AND MATCHING NETWORK CIRCUIT - A system and method are provided for controlling a radio frequency (RF) power amplifier. A magnitude input and a phase input are received for transmission of a RF signal by the RF power amplifier. A digital pulse, having a center position relative to an edge of a reference clock based on the phase input and having a width based on the magnitude input, is generated. The digital pulse is filtered with a resonant matching network to produce the RF signal corresponding to the magnitude input and the phase input. | 11-12-2015 |
20150326259 | CONTROL OF MISO NODE - A method for generating a radio frequency (RF) signal is disclosed herein. The method includes generating, with a plurality of analog-to-digital converters, analog control signals. A modulated control signal is generated, using a modulator, based on the analog control signals. A biased modulated control signal is generated, using an amplifier, based on the modulated control signal and a first bias control signal. Further, the RF signal is generated, using a multiple-input-single-output (MISO) device, based on the biased modulated control signal and a second bias control signal. | 11-12-2015 |
20150326325 | WIRELESS CIRCUIT - A wireless circuit ( | 11-12-2015 |
20150326349 | SYSTEM AND METHOD FOR DIGITAL MEMORIZED PREDISTORTION FOR WIRELESS COMMUNICATION - A power amplifier system includes an input operable to receive an original value that reflects information to be communicated and an address data former operable to generate a digital lookup table key. The power amplifier system also includes a predistortion lookup table coupled to the address data former and a power amplifier having an output and coupled to the predistortion lookup table. The power amplifier system further includes a feedback loop providing a signal associated with the output of the power amplifier to the predistortion lookup table and a switch disposed in the feedback loop and operable to disconnect the predistortion lookup table from the output of the power amplifier. | 11-12-2015 |
20150333780 | System and Method for Null Filling of IQ Waveform - System and method embodiments are provided for null filling of IQ waveform. In an embodiment method, samples below a predetermined threshold are selected from a plurality of samples of an input signal. Amplitude values of a complex null-fill function are then calculated to push amplitudes of the samples below the predetermined threshold to a signal level at the predetermined threshold. The phase values of the complex null-fill function are calculated to push the samples of the input signal in an IQ plane in a defined direction from a point closest to a zero signal value. The resulting complex null-fill function is filtered within a predetermined bandwidth of the input signal, and then added to the input signal to provide a modified input signal for amplification. | 11-19-2015 |
20150341060 | DISTORTION COMPENSATION DEVICE AND DISTORTION COMPENSATION METHOD - A distortion compensation device which compensates for a distortion of an amplifier includes an FIR filter, a calculation unit that calculates an error between a reference signal and a feedback signal from the amplifier, an update unit that updates a coefficient set to the FIR filter on the basis of the error, and a delay unit that, on the basis of a magnitude of the coefficient, delays the feedback signal while controlling a delay of the feedback signal with respect to the reference signal. | 11-26-2015 |
20150349749 | PROGRAMMABLE TRANSMIT CONTINUOUS-TIME FILTER - A programmable-current transmit continuous-time filter (TX-CTF) system can be included in a radio frequency (RF) transmitter. The input of the TX-CTF can receive a baseband transmission signal, and the output of the TX-CTF can be provided to an upconversion mixer for conversion to RF for transmission. The TX-CTF includes amplifier circuitry and passive circuitry that together define the filter parameters. The TX-CTF further includes programmable current circuitry that provides a programmable bias current to the amplifier circuitry. The TX-CTF system also includes control logic that receives one or more transmitter control signals and, in response, generates signals that control the bias current provided to the TX-CTF. | 12-03-2015 |
20150349812 | CIRCUITS AND METHODS RELATED TO POWER DETECTORS FOR RADIO-FREQUENCY APPLICATIONS - Circuits and methods related to power detectors for radio-frequency (RF) applications. In some embodiments, a power amplifier (PA) system can include a PA circuit having a driver stage and an output stage. The PA system can further include a detector configured to receive a portion of an RF signal from a path between the driver stage and the output stage. The detector can be further configured to generate an output signal representative of power associated with the RF signal and compensated for variation in at least one operating condition associated with the PA circuit. | 12-03-2015 |
20150349814 | DISTORTION-COMPENSATION DEVICE AND DISTORTION-COMPENSATION METHOD - Disclosed is a distortion compensation apparatus that, by appropriately generating a distortion-compensation coefficient, makes it possible to obtain a desired transmission output, and substantially reduce the amount of power leakage to an adjacent channel. Reception section ( | 12-03-2015 |
20150349815 | RADIO DEVICE - A radio device is configured to be capable of performing upsampling on a forward wave containing a first signal and a second signal to broaden a processing band to a transmission band, then amplifying the forward wave using an amplifier, and transmitting the amplified forward wave. In the radio device, an FW power calculator calculates the power of a first component corresponding to a part of the transmission band from among the forward wave. An Rev power calculator calculates the power of a second component corresponding to a part of the transmission band from among a reflected wave. A VSWR calculator calculates a VSWR using the power of the forward wave calculated by the FW power calculator and the power of the reflected wave calculated by the Rev power calculator. | 12-03-2015 |
20150349816 | APPARATUS AND METHOD FOR REMOVING NOISE OF POWER AMPLIFIER IN MOBILE COMMUNICATION SYSTEM - A transmitter in a wireless communication system is provided. The transmitter includes a baseband signal processor for detecting an envelope signal, a supply modulator (SM) for producing power to be supplied to a power amplifier using the detected envelope signal, and the power amplifier for receiving voltage from the SM and for amplifying power of a transmit signal. The SM generates a compensation signal corresponding to switching noise generated via switching amplification, and adds the compensation signal and the switching noise. The amplifier of the wireless communication system can produce low switching noise, and the envelope tracking power amplifier can prevent reception degradation due to the noise of the supply modulator. | 12-03-2015 |
20150349817 | TRANSMIT NOISE AND IMPEDANCE CHANGE MITIGATION IN WIRED COMMUNICATION SYSTEM - Methods and systems are provided for mitigating noise and/or impedance effects in transmitters. The mitigation comprises, when transmitter is in a non-active mode, decoupling at least a portion of the transmitter and coupling an auxiliary component to a remaining portion of the transmitter. When the transmitter is in an active mode, the auxiliary component is decoupled from the remaining portion of the transmitter, and the at least a portion of the transmitter is coupled to the remaining portion of the transmitter. The auxiliary component comprises one or more of: a resistive element, a capacitive element, and a reactive component. The auxiliary component is configured such that it may achieve a small mismatching error. | 12-03-2015 |
20150358038 | ADAPTIVE TRANSMITTER EFFICIENCY OPTIMIZATION - In one aspect there is provided a method. The method may include sampling an output of a power amplifier, wherein the sampled power amplifier output represents a modulated carrier being transmitted; processing to baseband the sampled power amplifier output; and determining one or more adjustments to the power amplifier, wherein the determined one or more power adjustments are determined based on at least one or more measurements performed on the baseband. Related apparatus, systems, methods, and articles are also described. | 12-10-2015 |
20150358039 | DIGITAL PREDISTORTION PROCESSING METHOD AND SYSTEM - A digital predistortion processing method and system comprises extracting from a predistortion coefficient parameter table a predistortion parameter corresponding to an input signal, so as to predistort the input signal and obtain a forward transmission signal; amplifying the power of the forward transmission signal to obtain an output signal; acquiring the output signal to obtain a feedback signal; delaying a predetermined number of sampling points so as to acquire the forward transmission signal and obtain a reference signal; conducting synchronization-related calculation on the reference signal and the feedback signal, and calibrating the feedback signal; training a predistortion coefficient according to the reference signal and the calibrated feedback signal; and forming the predistortion coefficient parameter table according to the predistortion coefficient and the amplitude of the input signal. The present invention can delay a predetermined number of sampling points for a transmission signal, thus greatly improving radio frequency index (ACPR). | 12-10-2015 |
20150358189 | PEAK SUPPRESSING DEVICE AND PEAK SUPPRESSING METHOD - A peak suppressing device ( | 12-10-2015 |
20150358922 | METHOD AND SYSTEM FOR UPDATING PREDISTORTION COEFFICIENT - Disclosed is a method and a system for switching pre-distortion coefficients, which is used to solve the problem of interference with neighbor cells due to the inferior pre-distortion coefficients. The method comprises: presetting a primary table and a standby table, wherein the primary table stores default pre-distortion coefficients and the standby table stores updated pre-distortion coefficients; when a data source of a pre-distortion processor adopts the standby table, adopting the updated pre-distortion coefficients to perform parameter output processing to acquire pre-distortion parameters, and conveying the pre-distortion parameters and an input signal to the pre-distortion processor to process to acquire pre-distortion signals; conveying the pre-distortion signals through various signal processors to acquire a first signal, and determining the power data of the first signal; and based on the comparing result of the power data of the first signal and a setting range, there are different actions. | 12-10-2015 |
20150365112 | BAND-GAP REFERENCE CIRCUIT FOR BIASING AN RF DEVICE - A voltage reference circuit implemented in GaAs to provide an output voltage component proportional to absolute temperature is described herein. The various embodiments of the voltage reference circuit described here can be used to provide precision voltage to bias a RF device. The voltage reference circuit can be provided on the same die as the RF device. The various embodiments described herein can be implemented in a GaAs material system. | 12-17-2015 |
20150372725 | POWER SENSING IN WIRELESS SYSTEM - Representative implementations of devices and techniques provide transmit power detection for an antenna of a wireless system having two or more transmit antennas. A correlation is reduced between a transmit signal of the antenna and signals from other antennas. | 12-24-2015 |
20150372850 | PEAK SUPPRESSION APPARATUS - A peak suppression apparatus includes an acquiring unit that acquires a first signal represented by an amplitude waveform of a multicarrier signal, a generator that generates a second signal represented by a waveform sequentially connecting a plurality of peak points adjacent to one another in the first signal as a peak detection signal for the multicarrier signal, a detector that detects a peak value and a peak timing of the multicarrier signal by using the peak detection signal, and a suppressing unit that suppresses a peak of the multicarrier signal based on the peak value and the peak timing. | 12-24-2015 |
20150381216 | Adaptive High-Order Nonlinear Function Approximation Using Time-Domain Volterra Series to Provide Flexible High Performance Digital Pre-Distortion - A method and apparatus are used to predistort input signal samples according to Volterra Series Approximation Model using one or more digital predistortion blocks ( | 12-31-2015 |
20150381217 | HIGH EFFICIENCY, REMOTELY RECONFIGURABLE REMOTE RADIO HEAD UNIT SYSTEM AND METHOD FOR WIRELESS COMMUNICATIONS - A remote radio head unit (RRU) system is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier inside the RRU. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by a wideband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, embodiments of the present invention can compensate for the nonlinearities as well as memory effects of the power amplifier systems and also improve performance, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers, multi-frequency bands and multi-channels. Consequentially, the remote radio head system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems. | 12-31-2015 |
20150381219 | ISOLATION CIRCUITS FOR DIGITAL COMMUNICATIONS AND METHODS TO PROVIDE ISOLATION FOR DIGITAL COMMUNICATIONS - Isolation circuits for digital communications and methods to provide isolation for digital communications are disclosed. An example isolation circuit includes an isolation barrier, a burst encoder in a first circuit, and an edge pattern detector in a second circuit. The example isolation barrier electrically isolates the first circuit from the second circuit. The example burst encoder generates a first pattern in response to receiving a rising edge on an input signal and generates a second pattern in response to receiving a falling edge on the input signal. The example edge pattern detector detects the first pattern or the second pattern received from the burst encoder via the isolation barrier, sets an output signal at a first signal level in response to detecting the first pattern, and sets the output signal at a second signal level in response to detecting the second pattern. | 12-31-2015 |
20160013820 | RADIO TRANSMITTING DEVICE AND RADIO TRANSMITTING METHOD | 01-14-2016 |
20160020789 | WIRELESS COMMUNICATION DEVICE, ELECTRONIC APPARATUS, AND MOVING OBJECT - A wireless communication circuit includes a vibration piece, and a semiconductor device that is connected to the vibration piece in order to integrate the vibration piece and a wireless communication IC into one package and thus to produce a wireless communication device by which a high-precision oscillation frequency is obtained. The semiconductor device includes an oscillation circuit of the vibration piece, and a wireless communication circuit that has an amplifier which amplifies a wireless signal that is generated by an oscillation signal from the oscillation circuit. The vibration piece and the semiconductor device are accommodated in one package. An excitation electrode of the vibration piece is arranged in the package in such a manner that the excitation electrode is not superimposed on the amplifier when the semiconductor device is viewed from above. | 01-21-2016 |
20160020790 | POWER COMBINING POWER AMPLIFIER ARCHITECTURES AND METHODS - Systems and methods are provided for implementing and using multiband transceivers. In a transmitter that comprises a plurality of transmit paths, a frequency spectrum that is used for transmission may be assigned to the plurality of transmit paths. Performance in each of the plurality of transmit paths may be monitored during transmission of signals, and based on the monitored performance, at least one of segmentation of the frequency spectrum and assignment of the segments to the plurality of transmit paths may be dynamically modified. Performance monitoring may be based on spectrum usage, peak to average power ratio (PAPR), and/or performance related criteria (e.g., threshold, timeout duration, etc.). Modifying operation of a transmit path may comprise disabling or enabling that transmit path. The frequency spectrum may be segmented such that each of the segments is uniformly sized, or such that at least one of the segments is sized differently. | 01-21-2016 |
20160020791 | SYSTEMS AND METHODS FOR INCREASING THE EFFECTIVENESS OF DIGITAL PRE-DISTORTION IN ELECTRONIC COMMUNICATIONS - Various embodiments of communication systems and methods in which the communication system is operative to find, record, and use sets of pre-distortion parameters in conjunction with a pre-distortion procedure, in which each said set of pre-distortion parameters is operative to specifically counter distortions produced in a power amplifier by a specific combination of level of input signal power and level of analog gain associated with a transmission path of the communication system. In some embodiments, there is a modulator, a transmission chain, a distortion analysis mechanism, and a pre-distortion mechanism, operative to analyze and modify signals so as to counter signal distortion. | 01-21-2016 |
20160020927 | CIRCUIT DEVICE, TRANSMISSION MODULE, ELECTRONIC APPARATUS, AND MOVING OBJECT - To provide different paths for communication of a serial signal required for high-speed communication and communication of transmission data that may be handled in low-speed communication, a circuit device includes a serial interface that receives a serial signal transmitted from a controller at a first communication speed, a transmission data input terminal that receives transmission data transmitted from the controller at a second communication speed slower than the first communication speed, and a transmission circuit that outputs a transmission signal corresponding to the transmission data based on the serial signal and the transmission data. | 01-21-2016 |
20160028433 | METHOD AND APPARATUS FOR DIGITAL PREDISTORTION FOR A SWITCHED MODE POWER AMPLIFIER - A method includes receiving an input signal and predistorting a baseband representation of the input signal at a carrier frequency and at one or more harmonic frequencies. The method also includes generating an output signal based on the predistorted baseband representation of the input signal, and transmitting the output signal to a power amplifier. Predistorting the baseband representation of the input signal at the carrier frequency could occur in parallel with predistorting the baseband representation of the input signal at the one or more harmonic frequencies. | 01-28-2016 |
20160028455 | Apparatus and Methods for Cross-Polarized Tilt Antennas - Embodiments are provided for cross-polarized antennas design with different down tilt angles that support versatile functionality, such as for MIMO or beamforming. An embodiment antenna circuit comprises a baseband signal processor, a pair of RF transmitters coupled to the baseband signal processor, a pair of PAs coupled to the RF transmitters, a 90°/180° hybrid coupler coupled to the RF transmitters, a pair of duplexers and two antennas coupled to the PAs. The two antennas are down tilted at different down tilt angles. A pair of signals is generated using the baseband signal processor, transmitted by the RF transmitters, and amplified using the PAs. Additionally, a 90° or 180° phase difference is introduced into the signals using the 90°/180° hybrid coupler. After the amplifying and introducing the phase difference, the signals are polarized at two different polarizations and down tilted at different down tilt angles using the two antennas. | 01-28-2016 |
20160036394 | POWER AMPLIFIER TIME-DELAY INVARIANT PREDISTORTION METHODS AND APPARATUS - An embodiment of the invention is a time-delay invariant predistortion approach to linearize power amplifiers in wireless RF transmitters. The predistortion architecture is based on the stored-compensation or memory-compensation principle by using a combined time-delay addressing method, and therefore, the architecture has an intrinsic, self-calibrating time-delay compensation function. The predistortion architecture only uses a lookup table to conduct both the correction of non-linear responses of a power amplifier and the compensation of any time-delay effects presented in the same system. Due to the time-delay invariant characteristic, the predistortion design has a wider dynamic range processing advantage for wireless RF signals, and therefore can be implemented in multi-carrier and multi-channel wireless systems. | 02-04-2016 |
20160036472 | Digital pre-distortion circuit and method, and digital pre-distortion training circuit - The present invention discloses a digital pre-distortion circuit capable of compensating an analog circuit for its non-linear characteristic. An embodiment of said digital pre-distortion circuit comprises: a pre-distortion training circuit and a pre-distortion circuit. Said pre-distortion training circuit is operable to process a digital feedback signal according to a Cholesky Decomposition related algorithm and thereby generate a plurality of coefficients in which the digital feedback signal is derived from an output signal of the analog circuit and the output signal of the analog circuit is derived from an original digital signal; and said pre-distortion circuit is operable to process the original digital signal according to the plurality of coefficients under a compensation mode and thereby generate a digital pre-distortion signal whose non-linear characteristic is able to compensate the non-linear characteristic of the analog circuit. | 02-04-2016 |
20160036473 | NONLINEAR COMPENSATING APPARATUS AND METHOD, TRANSMITTER AND COMMUNICATION SYSTEM - A nonlinear compensating apparatus and method, a transmitter and a communication system are provided. The apparatus includes a preprocessor configured to preprocess a transmitted signal according to a pre-obtained preprocessing coefficient and a predistorter configured to perform predistortion for the preprocessed signal, and a result of comparison of a characteristic parameter of the signal that has been preprocessed and then predistorted with that of the transmitted signal satisfies a predetermined condition. By preprocessing the transmitted signal at the transmitter end, the embodiments of the present disclosure may perform efficient nonlinear compensation only needing to measure at the transmitter end and without needing to perform many times of measurement at the receiver end, and may lower complexity of circuits of the communication system and complexity of calculation. | 02-04-2016 |
20160043752 | TUNABLE CIRCUIT ELEMENTS FOR DYNAMIC, PER ELEMENT POWER - A communication device and method mitigates specific absorption rate (SAR) exposure of a user. A radio frequency (RF) transmitter amplifies outgoing communication signals to a total radiated power (TRP) level. A matching network electrically connected to the RF transmitter receives the outgoing communication signals. The matching network divides the TRP level of received, outgoing communication signals to a first power level at a first network output and to a second power level at a second network output. First and second antennas electrically connected respectively to the first and second network output radiate the divided, outgoing communication signals at the first and second power levels. A SAR controller communicatively connected to the matching network controls the matching network to shift transmit power between the first and second antennas while maintaining TRP level to reduce SAR exposure of the user. | 02-11-2016 |
20160048145 | VOLTAGE GENERATING CIRCUIT AND POLAR TRANSMITTER - A voltage generating circuit comprising: an output current generating circuit, generating an output current, such that an output voltage is generated at an output terminal, according to an output voltage control signal; a comparing device, comprising a first input terminal receiving a reference voltage, a second input terminal receiving a feedback voltage related with the output voltage, and an output terminal outputting the output voltage control signal according to the reference voltage and the feedback voltage; an adjustable voltage dropping circuit, comprising a first terminal coupled to the second input terminal, and a second terminal coupled to the output terminal; and a current source, for generating a predetermined current to the first terminal of the adjustable voltage dropping circuit, thereby the feedback voltage is generated at the first terminal of the adjustable voltage dropping circuit. The predetermined current flows through the adjustable voltage dropping circuit to the output terminal. | 02-18-2016 |
20160056846 | Analog Compensation Circuit and Method - Disclosed herein are an analog compensation circuit and a method for tuning an analog compensator in full-duplex transmission systems. An embodiment analog compensation circuit includes a secondary receiver configured to receive and convert a sampled self-interference signal to a baseband self-interference signal. A tuner is coupled to the secondary receiver and configured to receive a baseband transmit signal and the baseband self-interference signal, and to compute complex gains according to the baseband transmit signal and the baseband self-interference signal. An analog compensator is coupled to the tuner and has multiple branches. The analog compensator is configured to receive the complex gains and use them to adjust respective attenuators and phase shifters of the branches. The analog compensator is further configured to process a sample of a transmit signal using the branches, the transmit signal being up-converted from a new baseband transmit signal. | 02-25-2016 |
20160056848 | SINGLE-SIDEBAND TRANSMITTER USING CLASS-S AMPLIFIER - An SSB transmitter includes a digital-to-digital converter generating first and second real signal components as a function of a complex input signal supplied to the transmitter, and a digital Hilbert transformation module coupled with the digital-to-digital converter and operative to generate first and second transformed signals as a function of the first and second real signal components. The transmitter further includes first and second bit-stream generators operative to generate first and second analog signals as a function of the first and second transformed signals, respectively. The transmitter includes first and second amplifiers. The first amplifier is operative to generate a first amplified signal as a function of the first analog signal. The second amplifier is operative to generate a second amplified signal as a function of the second analog signal. An analog hybrid coupler is connected with the first and second amplifiers and operative to perform an analog Hilbert transformation. | 02-25-2016 |
20160065166 | SEMICONDUCTOR DEVICE AND ADJUSTMENT METHOD OF FILTER CIRCUIT - A wireless communication device includes a radio frequency integrated circuit (RFIC) which includes a filter circuit operable to pass a desired signal component of a high-frequency signal inputted and operable to attenuate a harmonic component of an integral multiple of the desired signal. The filter circuit includes a first inductor and a second inductor coupled to a signal line transmitting the high-frequency signal. A first input terminal and a second input terminal are operable to receive the high-frequency signal as a differential signal, wherein the first inductor and the second inductor are formed by a first differential inductor and a second differential inductor are coupled between the first input terminal and the second input terminal. | 03-03-2016 |
20160065249 | CAPTURE SELECTION FOR DIGITAL PRE-DISTORTION ADAPTATION AND CAPTURE CONCATENATION FOR FREQUENCY HOPPING PRE-DISTORTION ADAPTATION - A digital pre-distortion component includes: a first capturing component that captures a first sample set of data; a first generating component that generates a first change matrix associated with a portion of the first sample set of data; a first memory component that stores the first change matrix; a second capturing component that captures a second sample set of data; a second generating component that generates a second change matrix associated with a portion of the second sample set of data; a second memory component that stores the second change matrix; a third capturing component that captures a third sample set of data; a third generating component that generates a third change matrix associated with a portion of the third sample set of data; a comparing component that compares the third change matrix with the first change matrix to obtain a first comparison, and compares the third change matrix with the second change matrix to obtain a second comparison; and an adapting component that adapts the digital pre-distortion component with the third sample set of data based on one of the first comparison and the second comparison. | 03-03-2016 |
20160065250 | WIRELESS COMMUNICATION UNIT, INTEGRATED CIRCUITS AND METHOD FOR LINEARIZING A TRANSMITTER SIGNAL - A wireless communication unit comprising a transmitter comprises: a linearization circuit arranged to receive and digitally distort an input signal; a radio frequency power amplifier operably coupled to the linearization circuit and arranged to amplify a radio frequency representation of the digitally distorted input signal; a feedback path arranged to feed back a portion of the amplified digitally distorted output of the received input signal to the linearization circuit; a bypass circuit comprising a plurality of energy storage elements operably coupled between an output of the radio frequency power amplifier and ground; and a first connector arranged to provide a representation of at least one electrical memory effect of at least one of the plurality of energy storage elements to the linearization circuit, wherein the linearization circuit is arranged to use the representation of the at least one electrical memory effect when digitally distorting the input signal. | 03-03-2016 |
20160065252 | BROADBAND RADIO FREQUENCY DATA COMMUNICATION SYSTEM USING TWISTED PAIR WIRING - A system for distributing broadband signals via twisted pair wiring is disclosed. Various aspects of the system involve use of a broadband signal distribution interface device and/or a broadband line driver. In one aspect, a broadband signal distribution interface device includes a broadband signal interface configured to receive broadband radio frequency signals, and a plurality of broadband signal connections configured to distribute broadband radio frequency signals. The interface device also includes circuitry defining an upstream signal path and a downstream signal path and including a gain control circuit and a slope control circuit each positioned along the downstream signal path. The circuitry is configured to accommodate downstream transmission of the broadband signals onto twisted pair wiring. | 03-03-2016 |
20160065253 | METHOD FOR AND DEVICE FOR REDUCING PEAK TO AVERAGE POWER RATIO - The present disclosure provides a method and device for reducing peak to average power ratio. A first communication is analyzed to a first in-phase parameter X | 03-03-2016 |
20160065254 | RF TRANSMITTER SUPPORTING CARRIER AGGREGATION AND ENVELOPE TRACKING - Exemplary embodiments of the present invention relate to an RF transmitter supporting carrier aggregation and envelope tracking and an RF transmitter according to an embodiment of the present invention comprises an RF path configured to convert a carrier aggregation signal in which a plurality of component carriers belonging to a baseband are aggregated into an RF signal; an ET path configured to generate an envelope signal by calculating magnitudes of the plurality of component carriers, respectively, and adding the calculated each magnitude of the component carriers; and an amplifier configured to power-amplify the converted RF signal according to a bias voltage corresponding to the generated envelope signal. According to exemplary embodiments of the present invention, power amplification efficiency and data transmission efficiency are improved by applying carrier aggregation and envelope tracking. | 03-03-2016 |
20160080007 | APPARATUS AND METHOD FOR ADAPTIVE COMMON MODE NOISE DECOMPOSITION AND TUNING - Described is an apparatus which comprises: a pre-driver coupled to a transmitter, the transmitter having a differential output; and a tuning circuit operable to couple to the differential output to tune the pre-driver of the transmitter according to a common mode noise signature of a common mode signal derived from the differential output. | 03-17-2016 |
20160080009 | SYSTEM AND METHOD FOR DIGITAL PREDISTORTION - The radio system comprises a radio unit and an antenna unit coupled to the radio unit. The antenna unit is physically separate and located remote from the radio unit. The antenna unit further comprises a digital (pre-distortion engine configured to pre-distort a modulated digital data signal; a digital to analog converter configured to convert the pre distorted digital data signal to a pre-distorted analog data signal; and a power amplifier configured to amplify the pre-distorted analog data signal which distorts the pre-distorted analog data signal. The distortion introduced by the power amplifier is opposite to the pre-distortion introduced by the digital pre-distortion engine such that the pre-distortion introduced by the digital pre-distortion engine approximately cancels the distortion introduced by the power amplifier. The radio unit further comprises a coefficient computation engine configured to calculate coefficients used by the digital pre-distortion engine to pre-distort the modulated digital data signal. | 03-17-2016 |
20160087591 | METHODS AND SYSTEMS FOR EFFICIENT AND ADAPTIVE OPERATION OF CONTINUOUS-WAVE AMPLIFIERS - Disclosed herein are methods and systems for efficient and adaptive operation of continuous-wave amplifiers. One embodiment takes the form of a method that includes adjusting an RF input power of an amplifier until an RF output power of the amplifier reaches a first target level. The method also includes adjusting a supply power of the amplifier until a power-added efficiency of the amplifier reaches a second target level. | 03-24-2016 |
20160087657 | Adaptively Controlled Pre-Distortion Circuits for RF Power Amplifiers - A system includes a crest-factor reduction circuit, a signal analyzer, and a pre-distortion circuit. The crest-factor reduction circuit reduces a crest factor of a baseband signal and generates a feedforward signal. The signal analyzer generates parameters based on the feedforward signal and an output signal from a power amplifier. The pre-distortion circuit generates a pre-distorted baseband signal based on the parameters for input to the power amplifier. | 03-24-2016 |
20160099729 | APPARATUS AND METHOD FOR QUADRUPLING FREQUENCY OF REFERENCE CLOCK - A method, an apparatus, and a computer program product are provided. The apparatus outputs a first sinusoidal signal and a second sinusoidal signal according to a first clock frequency, generates, a first digital signal having a 25% duty cycle based on the first sinusoidal signal, generates a second digital signal having a 25% duty cycle based on the second sinusoidal signal, combines the first digital signal and the second digital signal to generate a combined digital signal having a 50% duty cycle and a second clock frequency that is double the first clock frequency, and doubles the second clock frequency of the combined digital signal to generate an output signal having a third clock frequency that is quadruple the first clock frequency. The apparatus further generates a control voltage for the first buffer and the second buffer based on the combined digital signal. | 04-07-2016 |
20160099732 | DYNAMIC BIAS CONTROL - Systems and methods for controlling a power amplifier includes combining a digital modulated data signal with a digital bias signal to generate a combined digital signal, the digital bias signal generated based on an envelope for the modulated data signal; converting, by a digital-to-analog converter, the combined digital signal into a combined analog signal, the combined analog signal comprising an analog modulated data signal and an analog envelope bias signal; and separating the analog modulated data signal and the analog bias signal onto separate signal paths, wherein the converting is performed using a single digital-to-analog converter. | 04-07-2016 |
20160105299 | Front-End Module And Coupling Compensation For Closed-Loop Digital Pre-Distortion System - Examples of front-end modules, apparatuses and methods for coupling compensation in a closed-loop digital pre-distortion (DPD) system are described. The closed-loop DPD circuit may include a PA and a loopback path. The PA may receive a PA input signal and amplify the PA input signal to provide a PA output signal proportional to a product of the PA input signal and a gain of the PA. The loopback path may receive the PA output signal to output a loopback signal. A forward coupling and a backward coupling may exist between the PA input signal and an output of the loopback path. The output of the loopback path may be proportional to a product of the PA output signal and a gain of the loopback path. The loopback path may include a coupling cancellation mechanism configured to cancel couplings between the PA input signal and the loopback signal. | 04-14-2016 |
20160112081 | PHASE NOISE SUPPRESSION - A transceiver comprises local oscillator circuitry, phase noise determination circuitry, mixing circuitry, and digital signal processing circuitry. The local oscillator circuitry is operable to generate a local oscillator signal. The phase noise determination circuitry is operable to introduce a frequency-dependent phase shift to the local oscillator signal to generate a phase-shifted version of the local oscillator signal. The mixing circuitry is operable to mix the local oscillator signal and the phase-shifted version of the local oscillator to generate a baseband signal having an amplitude proportional to a phase difference between the local oscillator signal and the phase-shifted version of the local oscillator signal. The digital signal processing circuity is operable to process the baseband signal to determine a phase error of the local oscillator signal, and perform signal compensation based on the determined phase error. | 04-21-2016 |
20160126983 | MULTI-BAND AMPLIFIER - A multi-band amplifier may operate in a first frequency band and a second frequency band. The multi-band amplifier may include a first amplifier, a second amplifier, and a coupler. The coupler may couple a signal, such as a communication signal, to a selected amplifier. In some embodiments, the coupler may include one or more inductive elements to couple the signal to the first or the second amplifier. In some embodiments, the inductive elements may include a balun. | 05-05-2016 |
20160126984 | MULTI-MODE AND MULTI-BAND FRONT-END DEVICE - A multi-mode and multi-band front-end device comprises at least one amplifier unit, at least one switching unit, at least one control unit, a plurality of transmission paths, and a plurality of frequency matching networks. The switching unit comprises at least input end and a plurality of connecting ends. Wherein the input end is electrically connected to the amplifier unit, and each of connecting ends is connected to each of transmission paths, respectively. Each of frequency matching networks is configured on each of transmission paths, and achieves impedance matching at different frequency bands, respectively. The multi-mode and multi-band front-end device is able to select one of transmission paths to transmit RF signal according to the frequency band of RF signal to be transmitted so as to improve the output power of the multi-mode and multi-band front-end device. | 05-05-2016 |
20160127164 | TRANSMITTER CIRCUIT, COMMUNICATION UNIT AND METHOD FOR AMPLIFYING A COMPLEX QUADRATURE SIGNAL - A transmitter circuit includes a frequency generation circuit configured to generate a local oscillator signal and a digital modulator configured to: receive data to be transmitted; quadrature modulate the received data to at least a first, Q, modulated value and a second, I, modulated value; examine the quadrature modulated data to determine if the first, Q, modulated value exceeds a limit, and in response thereto selectively modify the quadrature modulated values to a first modified, Q′, modulated value and a second modified, I′, modulated value thereby bringing only a value of the first modified, Q′, modulated value to within the limit. A local oscillator phase is selected in order to map the first modified, Q′, modulated value and second modified, I′, modulated value to desired quadrature values. A digital power amplifier, DPA, coupled to the digital quadrature modulator, is configured to amplify the quadrature modified modulated data. | 05-05-2016 |
20160142078 | ENVELOPE SHAPING IN ENVELOPE TRACKING POWER AMPLIFICATION - The subject matter described herein relates to envelope shaping in envelope tracking power amplification. A method, apparatus and computer storage medium are provided for envelope shaping in envelope tracking power amplification. In an embodiment, the method comprises performing an envelope shaping operation on reference envelope signals in a time domain to obtain shaped envelope signals; performing a signal quality control on the shaped envelope signals in a frequency domain; and converting the shaped envelope signals from the frequency domain into the time domain to obtain resulting shaped envelope signals. In such a way, a better signal quality can be provided without any modifications to the receiver side. And in turn, the PAPR of the envelope signal may be reduced before entering into a supply modulator and the efficiency of the ET supply modulator could be improved. As a result, the ET PA system performance can be enhanced. | 05-19-2016 |
20160149600 | METHOD FOR REDUCING THE CREST FACTOR WIDE BAND SIGNAL - A method for reducing the crest factor of a wideband signal including N narrowband signals, N being a natural integer greater than or equal to two, the method, implemented by an emitting equipment, including phase shifting the narrowband signals between them in such a way as to reduce the crest factor. | 05-26-2016 |
20160156375 | Wireless Transceiver | 06-02-2016 |
20160164553 | Linear Composite Transmitter Utilizing Composite Power Amplification - The present invention provides a compound transmitter having power efficiency characteristics and distortion characteristics superior, over a wide band, to those of a Doherty transmitter, and having fewer elements constituting an RF circuit. The present invention is therefore provided with a compound amplifier ( | 06-09-2016 |
20160164554 | Transmitter with Quantization Noise Compensation - The invention discloses a transmitter comprising a pulse encoder for creating pulses from the amplitude of an input signal to the transmitter, a compensation signal generator for cancelling quantization noise caused by the pulse encoder, a mixer or I/Q modulator for mixing an output of the pulse encoder with the phase of an input signal to the transmitter, said output of the pulse encoder comprising the amplitude of the complex input signal plus the quantization noise caused by the pulse encoder, and an amplifier for creating an output signal from the transmitter. In the transmitter, a control signal (C | 06-09-2016 |
20160173032 | APPARATUS AND METHODS FOR A CAPACITIVE DIGITAL-TO- ANALOG CONVERTER BASED POWER AMPLIFIER | 06-16-2016 |
20160173144 | SYSTEMS AND METHODS OF RF POWER TRANSMISSION, MODULATION, AND AMPLIFICATION | 06-16-2016 |
20160182095 | LOW-IMPEDANCE REFERENCE VOLTAGE GENERATOR | 06-23-2016 |
20160182100 | CIRCUIT AND METHOD FOR PROVIDING A RADIO FREQUENCY SIGNAL | 06-23-2016 |
20160182103 | METHOD AND FREQUENCY AGILE PRE-DISTORTED TRANSMITTER USING PROGRAMMABLE DIGITAL UP AND DOWN CONVERSION | 06-23-2016 |
20160191087 | SYSTEM AND METHOD FOR INCREASING BANDWIDTH FOR DIGITAL PREDISTORTION IN MULTI-CHANNEL WIDEBAND COMMUNICATION SYSTEMS - A method of operating a communications system includes receiving a signal at a digital predistorter (DPD), introducing predistortion to the signal using the DPD, and converting the predistorted signal to an analog signal using a digital-to-analog converter having a first bandwidth. The method also includes amplifying the analog signal, sampling the amplified signal using an analog-to-digital converter having a second bandwidth less than the first bandwidth, and extracting coefficients of the DPD from the sampled signal. | 06-30-2016 |
20160197627 | DIGITAL PREDISTORTION SYSTEM AND METHOD BASED ON ENVELOPE TRACKING AND RADIO FREQUENCY SYSTEM | 07-07-2016 |
20160380656 | PROGRAMMABLE TRANSMIT CONTINUOUS-TIME FILTER - A programmable-current transmit continuous-time filter (TX-CTF) system can be included in a radio frequency (RF) transmitter. The input of the TX-CTF can receive a baseband transmission signal, and the output of the TX-CTF can be provided to an upconversion mixer for conversion to RF for transmission. The TX-CTF includes amplifier circuitry and passive circuitry that together define the filter parameters. The TX-CTF further includes programmable current circuitry that provides a programmable bias current to the amplifier circuitry. The TX-CTF system also includes control logic that receives one or more transmitter control signals and, in response, generates signals that control the bias current provided to the TX-CTF. | 12-29-2016 |
20170237453 | MODULATED SIGNAL GENERATING DEVICE AND WIRELESS DEVICE | 08-17-2017 |
20170237454 | NON-LINEAR PRODUCT DETECTION AND CANCELLATION IN A WIRELESS DEVICE | 08-17-2017 |