Entries |
Document | Title | Date |
20080198954 | Channel equalization using frequency and phase compensation - A system and method are provided for channel equalization using a combination of frequency and phase compensation. The method receives a serial data stream input, and parallel processes the data stream input through a first and second path. The first path has a first frequency response, and the second path has a second frequency response, higher than the first frequency response. Signals are combined from the first and second paths, creating a frequency compensated signal. Then, the frequency compensated signal is parallel processed through a third path having a first time delay, and a fourth path having a fourth time delay, greater than the third time delay. The signals from the third and fourth paths are combined, created a phase compensated signal. In one aspect, the phase compensated signal is amplified, creating a voltage limited output signal. | 08-21-2008 |
20080232518 | Apparatus and Method for Automatic Gain Control of Mobile Station in Ofdm System - The present invention relates to an automatic gain control apparatus and method of a mobile station in an OFDM system. The present invention includes: identifying a preamble section and a data symbol section in a received frame signal; when a current symbol is the preamble section, measuring a power value of a preamble signal, comparing the measured power value of the preamble signal and a threshold value, and amplifying the received frame signal based on a predetermined gain value (gain=threshold−power value) according to a difference between the measured power value and the threshold value; when a data symbol section includes a pilot carrier, measuring an average power value of the pilot carrier in the data symbol when the data symbol section includes the pilot carrier, comparing the measured average power value of the pilot carrier and the threshold value, and amplifying the received frame signal based on a predetermined gain value (gain=threshold−pilot average power value) according to a difference; and when the data symbol section includes no pilot carrier, maintaining an existing gain, or performing an automatic gain control operation according to a gain estimated by using the pilot carrier during the data symbol section including the pilot carrier. Accordingly, the mobile station of the OFDM system that is robust to channel variation and various fading environments may be provided to efficiently perform the automatic gain control. | 09-25-2008 |
20080240312 | RADIO RECEIVER HAVING A MULTI-STATE VARIABLE THRESHOLD AUTOMATIC GAIN CONTROL (AGC) FOR FAST CHANNEL SCANNING ACQUISITION AND METHOD FOR USING SAME - A radio receiver ( | 10-02-2008 |
20080267326 | Multi-channel receiver with improved AGC - An improved multi-channel receiver for satellite broadcast applications or the like. In an exemplary embodiment, an AGC loop, under the control of an AGC processor, controls the gain of an analog sub-receiver adapted to simultaneously receive multiple signals to achieve a desired AGC setpoint signal intensity from the sub-receiver. Multiple digital demodulators, coupled to the sub-receiver by an analog-to-digital converter (ADC), demodulate the multiple received signals. The AGC controller, based upon which of the received signals are being demodulated, selects the desired AGC setpoint from a table of setpoints. The AGC controller may also provide selective power control to circuitry in the receiver and select the resolution of the ADC. The controller updates the AGC loop with step values selected from a group of values by an AGC control algorithm. Different groups of step values may be used by the controller depending on whether the signals are fading or not. | 10-30-2008 |
20080273636 | AUTOMATIC GAIN CONTROL CIRCUIT FOR MIMO OFDM RECEIVER - An automatic gain control (AGC) circuit and method for performing AGC for an orthogonal frequency-division multiplexing (OFDM) receiver measures signal power of input digital signals that are derived from incoming data frames with preambles to produce gain change signals when the signal power differs from a reference target power level. The gain of an amplifier of the OFDM receiver is changed in response to the gain change signals until a preamble of the data frames is detected for the first time. The gain of the amplifier of the OFDM receiver is further changed in response to the gain change signals, after the preamble is detected, only during periods when the preambles of the data frames are being processed by the OFDM receiver such that the gain of the amplifier is not changed during periods when other portions of the data frames are being processed by the OFDM receiver. | 11-06-2008 |
20080273637 | In-Situ Gain Calibration of Radio Frequency Devices Using Thermal Noise - An apparatus for calibrating gain of an radio frequency receiver (“Rx”) is disclosed to provide, among other things, a structure for performing in-situ gain calibration of an RF integrated circuit over time and/or over temperature without removing the RF integrated circuit from its operational configuration, especially when the gain of the RF integrated circuit is susceptible to variations in process, such as inherent with the CMOS process. In one embodiment, an exemplary apparatus includes a thermal noise generator configured to generate thermal noise as a calibrating signal into an input of an Rx path of an RF integrated circuit. The apparatus also includes a calibrator configured to first measure an output signal from an output of the Rx path, and then adjust a gain of the Rx path based on the thermal noise. In one embodiment, the thermal noise generator further includes a termination resistance and/or impedance. | 11-06-2008 |
20080279315 | WIRELESS RECEIVING APPARATUS AND WIRELESS RECEIVING METHOD - According to an aspect of the invention, there is provided a wireless receiving apparatus including: antennas; antenna branches each capable of receiving a wireless signal; a demodulating unit demodulating a reception signal; an antenna selecting unit selecting a packet waiting antenna; a packet detecting unit detecting a packet; a power supply control unit stopping power to a packet non-waiting antenna branch except for the antenna branch connected to a packet waiting antenna until the packet is detected and supplying power to the antenna branches after the packet is detected; a calculating unit calculating a gain value of VGA unit based upon the reception signal via the packet waiting antenna; and a control unit controlling a gain of the VGA unit based upon the calculated gain value after the packet non-waiting antenna branch is initiated when power to the antenna branches is supplied. | 11-13-2008 |
20080279316 | METHOD AND APPARATUS FOR DATA RECEPTION - Method and apparatus for data reception are provided, retrieving digital values transmitted through a cable. In a data receiver, an equalizer equalizes an input signal based on a boost value to generate an equalized signal, and a data extractor samples the equalized signal to extract output values from each symbol period. The data extractor detects signal quality of the equalized signal to adjust the boost value accordingly. An optimal time point is detected within one symbol period where an output value is an ensured valid, and variation rate of the optimal time point is counted as an inverse indicator of the signal quality. | 11-13-2008 |
20080285690 | ELECTRIC FIELD STATE DETERMINATION METHOD FOR DIGITAL MULTIMEDIA BROADCAST AND PORTABLE DEVICE USING THE SAME - A method for accurately estimating the received signal strength of a broadcast system and a portable device that may receive broadcast signals using the received signal strength estimation method are provided. An electric field state determination method for digital multimedia broadcast includes determining a current electric field on the digital broadcast channel based on at least one of whether generation of a transport stream is detected, a result of a comparison between a current buffering rate of a buffer and a threshold buffering rate, and a variation of a number of RGB frames accumulated in a buffer. | 11-20-2008 |
20080298518 | Automatic Gain Control Unit of a Receiver - An automatic gain control (AGC) circuit that includes an RF amplifier with first and second distinct active gain control regions, wherein a gain of the RF amplifier varies during operation in the active gain control regions | 12-04-2008 |
20080298519 | Receiver Device - The enclosure of the receiver device is divided into an antenna vicinity enclosure | 12-04-2008 |
20080298520 | High-speed multi-mode receiver - A data receiver is provided which is operable to receive a signal controllably pre-distorted and transmitted by a transmitter, to generate information for adjusting the pre-distortion applied to the signal transmitted by the transmitter, and to transmit the information to the transmitter. The receiver is further operable to perform adaptive equalization to receive the signal transmitted by the transmitter. | 12-04-2008 |
20080304603 | METHODS AND APPARATUS FOR INITIAL ACQUISITION GAIN CONTROL IN A COMMUNICATION SYSTEM - Methods and apparatus for initial acquisition gain control in a communication system a method for use in a wireless communication system are disclosed. A disclosed methodology includes measuring the power of a signal received by a transceiver a number of times over a prescribed time period, the signal including a number of symbols. A gain of the transceiver is unidirectionally adjusted when a currently measured power is greater than a previously measured power during the prescribed time period until a maximal power level is measured. By adjusting the gain to accommodate a maximal power value, which is the same as the power level of an acquisition pilot symbol, overshoot and distortion by the transceiver are avoided during initial timing and frequency acquisition. Corresponding apparatus are also disclosed. | 12-11-2008 |
20080304604 | Apparatus and Method for Detecting Frame Boundary in Wireless Communication System - Disclosed is an apparatus and a method for detecting a boundary of a frame in a wireless communication system. The apparatus includes: a controller for measuring correlation energy with preambles with respect to received signals transmitted from a transmitter, measuring strength of the received signals, and removing a sample from frames constituting the received signals, the preambles predetermined and used by the system, the sample having a ratio of the correlation energy with respect to the strength of the received signals, the ratio being smaller than a reference value; and a classifier for extracting a maximum value from the correlation energy received from the controller, and determining a boundary of a downlink of the frames constituting the received signals. | 12-11-2008 |
20080317175 | AUTOMATIC GAIN CONTROL CIRCUIT, RECEIVING APPARATUS AND AUTOMATIC GAIN CONTROL METHOD - An automatic gain control circuit includes: an amplification degree control section for calculating power of a digital value of a received signal, and for controlling an amplification degree of an amplifier of a receiving apparatus so that a difference between the power and predetermined reference power is zero; a received signal quality measuring section for measuring quality of the received signal; a reference power adjusting section for, upon finding that the measured quality of the received signal is below a fixed level, adjusting the reference power for a predetermined period of time; and a reference power updating section for causing the reference power adjusting section to continue to adjust the reference power until the quality of the received signal recovers to be at a predetermined recovery level or above, and for updating the reference power so that the reference power takes on an optimally adjusted value. | 12-25-2008 |
20080317176 | Automatic Gain Control Apparatus and Method in Wireless Telecommunication System - The present invention relates to an automatic gain control apparatus and method in a wireless telecommunication system which measures the strength of received signals using preamble symbols and automatically control the gain of an amplifier based on the measurement results. The automatic gain control apparatus and method according to present invention performs automatic gain control of measuring sample power in a sample unit for input signals, acquiring a sample power average value during a unit symbol period, detecting a maximum value during one frame period for the acquired sample power average value and then calculating a gain control value based on it. | 12-25-2008 |
20090003495 | ENHANCED PILOT SIGNAL RECEIVER - Briefly, in accordance with one embodiment, a method of adjusting for digital automatic gain control (DAGC) quantization error in a mobile station is as follows. A first DAGC value is stored before reception of one or more enhanced pilot signals. A second DAGC value is computed during reception of the one or more enhanced pilot signal. The first DAGC value is restored after reception of the one or more enhanced pilot signals is over. An advantage associated with this particular embodiment may include reduction in quantization error for digital automatic gain control. | 01-01-2009 |
20090060102 | FAST PREDICTIVE AUTOMATIC GAIN CONTROL FOR DYNAMIC RANGE REDUCTION IN WIRELESS COMMUNICATION RECEIVER - A method of fast predictive automatic gain control is disclosed including estimating channel gain applied to a received signal, predicting channel gain at a subsequent time by applying temporal correlation statistics to the estimated channel gain, determining a predicted receiver gain which reduces variance between the predicted channel gain and a predetermined target power level, and applying the predicted receiver gain to the received signal. The method may include applying linear minimum mean-squared error prediction to the estimated channel gain. The method may include predicting error variance at the subsequent time by applying the temporal correlation statistics to the estimated channel gain and combining the predicted channel gain and the predicted error variance. The method may include estimating channel gain of known pilot symbols, estimating a temporal correlation function using the estimated channel gain, and determining predicted channel gain using the estimated channel gain and the estimated temporal correlation function. | 03-05-2009 |
20090060103 | CHANNEL ESTIMATION APPARATUS AND METHOD FOR THE SAME - A channel estimation apparatus and a method for the same are provided. The channel estimation apparatus includes a preamble buffer unit, a gain adjusting unit, a demodulation unit, and an estimation unit. The preamble buffer unit receives and temporarily stores a plurality of symbols in preamble signal. The symbols correspond to a plurality of gain control values. The gain adjusting unit adjusts the symbols to a plurality of gain normalized symbols according to the gain control values. The demodulation unit receives the gain normalized symbols and demodulates the same to obtain a frequency domain demodulation signal. The estimation unit receives the frequency domain demodulation signal and performs a channel estimation about the frequency domain demodulation signal and a frequency domain reference value of a standard preamble signal, so as to obtain a channel frequency response. | 03-05-2009 |
20090060104 | Apparatus and Method for RF Packet Detection and Symbol Timing Recovery - A radio frequency (RF) receiver having an analog gain control section for controlling the gain of a received RF signal, and a digital demodulator section for demodulating the output of the gain control section, includes an analog GO circuit connected to recognize the presence of a data packet within a received RF signal in the analog gain control section, and in response to produce an analog GO signal, a digital GO circuit connected to recognize the presence of a data packet within the received RF signal from the digital demodulator section, and in response to produce a digital GO signal, and control circuitry connected to enable gain control functions within the analog gain control section and digital demodulator functions within the digital demodulator section in response to respective analog and digital GO signals. | 03-05-2009 |
20090067556 | Communications adaptive automatic gain controller - An adaptive scaling processor operates in combination with a conventional automatic gain control controller providing an amplification gain A to m-ary symbol-modulated communication signals, the scaling processor scaling by a scaling factor Z the m-ary communication signal for providing an over all gain of an (A)(Z) product minimizing the BER that is optimum for the communications channel for improved BER performance in communication systems. | 03-12-2009 |
20090074118 | Front-end for digital video receiver and method for automatic gain control thefeof - A method for automatic gain control of a front-end for a digital video receiver is provided. The method includes the following steps. First, a radio frequency signal is received and converted to an intermediate frequency signal. Then, the IF signal is amplified according to a gain. Next, the amplified IF signal is demodulated into a base-band signal, and the base-band signal is encoded into a transport stream. After that, a DC level of a pulse width modulation signal is controlled by at least one variable resistor to adjust the gain, the PWM signal being related to a setting of the gain. Afterwards, a BER measurement at each potential setting of the gain and the variable resistor under one or more power levels of the RF signal is read, and an optimum setting of the gain and the variable resistor is selected according to the BER measurements. | 03-19-2009 |
20090080577 | COMMUNICATION SEMICONDUCTOR INTEGRATED CIRCUIT, RADIO COMMUNICATION SYSTEM, AND ADJUSTMENT METHOD OF GAIN AND OFFSET - A D.C. offset canceling and gain adjusting techniques permitting completion of correction of D.C. offsets and gain adjustment of amplifiers for amplifying reception signals in a radio communication system are provided. A communication semiconductor integrated circuit has a plurality of low-pass filters and variable gain amplifiers which are alternately connected in multiple stages, and high gain amplifier circuits for amplifying reception signals to a predetermined amplitude level. Offset cancellation values are generated by detecting D.C. offsets of amplifiers for amplifying reception signals according to a set gain, and stored into a memory, and read out of the memory to cancel the D.C. offsets of the amplifiers when starting reception and altering the gain. Gain setting in a high gain amplifying section is accomplished using rough and precise settings. | 03-26-2009 |
20090086857 | Reduced voltage subLVDS receiver - A rail-to-rail high speed subLVDS receiver demonstrates good jitter and duty cycle performance for high-speed signals at low power supply levels. A sample receiver includes a voltage shifter for shifting the voltage levels of a differential input signal so that a shifted differential input signal is produced. The shifted differential input signal can be applied to a first differential pair, and the differential input signal can be applied to a second differential pair. The outputs of the first and second differential pairs can be summed together to produce a differential output signal. The differential output signal can be output using an output block. A clamp circuit can be used to adjust the gain of the first differential pair responsive to a common mode voltage of the first and second differential input signals. | 04-02-2009 |
20090086858 | DIGITAL DEMODULATING APPARATUS, DIGITAL RECEIVER, CONTROLLING METHOD OF THE APPARATUS, COMPUTER PROGRAM PRODUCT, AND RECORDING MEDIUM RECORDING THEREON THE PRODUCT - A digital demodulating apparatus includes an intensity changing unit that changes the intensity of a received signal; a channel selecting unit that applies channel selection processing to the signal whose intensity has been changed by the intensity changing unit; a demodulating unit that applies demodulation processing to the signal to which the channel selecting unit has applied channel selection processing; a noise evaluating unit that evaluates an influence of noise components on a desired component in the signal to be input to the demodulating unit; and a gain changing unit that changes, on the basis of a result of the evaluation by the noise evaluating unit, the gain of the change in the intensity of the received signal by the intensity changing unit so that the influence of the noise components is decreased in the signal to be input to the demodulating unit. | 04-02-2009 |
20090086859 | RECEIVING UNIT RECEIVING DIGITAL TELEVISION BROADCASTING - In a receiving unit, an AGC circuit controls the gain of a high frequency amplifier based on an output signal of a mixer, that is, an intermediate frequency signal obtained before an unnecessary frequency component is removed by a BPF. Therefore, deterioration in the distortion characteristic of the mixer can be suppressed more effectively than a conventional case where the gain of the high frequency amplifier is controlled based on an intermediate frequency signal that has passed through the BPF and amplified by an intermediate frequency amplifier. | 04-02-2009 |
20090092207 | Automatic Gain Control Apparatus - An automatic gain control apparatus that can prevent jumps in the gain coefficient when the gain coefficient is altered, due to a sharp change in the level of the received signal before and after the alteration, having a mean square circuit ( | 04-09-2009 |
20090103668 | AUTOMATIC GAIN CONTROL CIRCUIT - A first MOS transistor (M | 04-23-2009 |
20090135969 | METHOD AND APPARATUS FOR COMPLEMENTARY CUMULATIVE DISTRIBUTION DRIVEN LEVEL CONVERGENCE FOR SPECTRUM SENSING - A method for use in a digital communications receiver for controlling an input signal level ( | 05-28-2009 |
20090135970 | DIRECT CONVERSION RECEIVER - A direct conversion receiver wherein even when signals are continuously received, the automatic gain control can be implemented in accordance with the signal levels from which DC offset voltages have been removed. The direct conversion receiver comprises a low-noise amplifier | 05-28-2009 |
20090135971 | NARROWBAND GAIN CONTROL OF RECEIVER WITH DIGITAL POST FILTERING - An Automatic Gain Control (AGC) circuit as used in a digital receiver that utilizes a main loop filter that is of a relatively wide bandwidth. A pre-filter, wideband variance is determined from the input digital signal, and a post-filter, narrowband variance is also determined. The wideband and narrowband variances are then compared to determine if the wideband signal power indicates a variance level that is too great to permit normal loop operation. By reapplying this difference in the power levels to the filter output as needed, such as by a scaling operation, the loss in dynamic range is effectively recovered. In a preferred embodiment, an adjustable gain input amplifier feeds an intermediate frequency (IF) signal to an analog-to-digital converter (ADC). The digitized IF signal is then down-converted to a baseband frequency and subjected to digital filtering. A narrowband sample variance (P | 05-28-2009 |
20090141839 | Apparatus and method for downstream power management in a cable system - An apparatus and method is disclosed to calculate the actual received desired channel power from the downstream transmit power of a Cable Modem Termination System (CMTS) when operating at the nominal line voltage and/or at the normal room temperature as per the DOCSIS specification. A Set-top Device produces a Downstream Power Management (DPM) gain measurement signal having a known power level. The Set-top Device embeds the DPM gain measurement signal onto a received downstream multi-channel communication signal. After embedding the DPM gain measurement signal onto the downstream multi-channel communication signal, the Set-top Device downconverts the combined DPM gain measurement signal and downstream multi-channel communication signal to recover one or more communication channels containing information of a broadcast. The Set-top Device measures a power level of a representation of the DPM gain measurement signal embedded within the one or more communication channels containing the information of the broadcast to determine a Set-top Device gain. The Set-top Device measures a power level of the one or more communication channels containing the information of the broadcast. The Set-top Device calculates the actual received desired channel power from the downstream transmit power of the CMTS based on the Set-top Device gain and the power level of the one or more communication channels containing the information of the broadcast. | 06-04-2009 |
20090154617 | AUTOMATIC GAIN CONTROL DEVICE, SIGNAL RECEIVING APPARATUS, AND SIGNAL RECEIVING METHOD - A signal receiving apparatus according to an embodiment of the present invention includes: an amplifier that controls a gain according to a gain control signal and amplifies a received signal to generate an amplified signal; an analog-to-digital (A/D) converter that converts the amplified signal into a digital signal; a Fourier transform unit that performs Fourier transform of the digital signal to a frequency domain signal to generate a Fourier transform signal; a demodulator that demodulates the Fourier transform signal to generate a demodulated signal; and an automatic gain control unit that divides the Fourier transform signal into a noise period and a symbol period, calculates the signal level of the noise period based on the signal level of the symbol period, and generates the gain control signal according to the signal levels of the symbol period and the noise period. Accordingly, when a non-cyclic burst signal is received, the non-cyclic burst signal is divided into a signal presence period and a signal absence period, and the gain is only controlled by using the signal presence period. Therefore, accuracy of the signal level can be secured, and the signal level of the symbol can be calculated in the frequency domain, thereby reducing complexity. | 06-18-2009 |
20090161802 | RECEIVER WITH ADAPTIVE POWER CONSUMPTION AND A METHOD IMPLEMENTED THEREIN - A receiver and a method for controlling power consumption therein are disclosed. The receiver comprises at least one front-end module, an amplifier, an Analog to Digital Converter (ADC) module, a spectrum analyzer and a control module. The at least one front-module is configured to receive and process a RF signal to obtain an IF signal. The amplifier is configured to amplify the IF signal received from the at least one front-end module with a variable gain. The ADC module receives the amplified IF signal and converts into a digital signal. Further, the spectrum analyzer estimates a power level of a signal information and a power level of a noise in the digital signal. Thereafter, the control module controls a variable gain of the amplifier and a variable dynamic range of the ADC based on the power level of the signal information and the noise in the digital signal. | 06-25-2009 |
20090161803 | Receiver and gain control method thereof - An analog and digital auto-gain control method includes the steps of: providing a gain-mapping table; determining an analog gain level according to power of a far-end transmitted signal; obtaining a gain-mapping value from the gain-mapping table according to the analog gain level; obtaining a digital gain value according to the gain-mapping value; and adjusting a gain of a digital signal according to the digital gain value. A receiver that performs the auto-gain control method is also disclosed. | 06-25-2009 |
20090190699 | GAIN CONTROL METHOD AND APPARATUS - An analog/digital gain control device avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses an analog to digital conversion method that increases the number of effective ADC bits by compressing the baseband input analog signal using a logarithmic circuit. After the compressed analog signal is converted into a digital signal, a digital anti-log process or look-up table (LUT) is used to expand the digital signal back to the original linear scale. The word size of the output of the anti-log process is larger than the input word size due to the nature of the anti-log function. To reduce the word size of the digital signal an open loop normalization technique can be applied. | 07-30-2009 |
20090207952 | AUTOMATIC GAIN CONTROL CIRCUIT - There are provided an A/D converting circuit ( | 08-20-2009 |
20090207953 | RECEIVING LEVEL CONTROL APPARATUS AND RECEIVER - A receiving level control apparatus includes an amplifier to receive a signal and to amplify the signal based on a gain control signal, a memory to store an accumulated level of the amplified signal at every sampling period, and a gain control section to judge whether or not the accumulated level, which has been accumulated from a first time instant, exceeds a first reference value at a predetermined timing, and to control the gain control signal for the amplifier in response to a length of a time period defined from the first time instant up to a second time instant in a case that the accumulated level exceeds the first reference value, the second time instant defined as a time instant when the gain control section judges that the accumulated level exceeds the first reference value. | 08-20-2009 |
20090207954 | MIMO SLOTTED ALOHA (MSA) SYSTEM - A method including receiving at a synchronizing node a first reference frame from a first reference node at a first time and storing a first time value representing the first time, and calculating a timing estimator by subtracting a minimum time value, representing the distance from the synchronizing node to the first reference node, from the first time value. The method includes receiving at the synchronizing node a second reference frame at a second time and transmitting from the synchronizing node to the first reference node a short timing contention time frame. The method includes receiving at the synchronizing node from the first reference node an arrival time value representing the time at which the first reference node received the short timing contention frame and calculating a time drift from the first arrival time value and the second time value and adjusting the timing estimator based on the time drift. | 08-20-2009 |
20090238313 | STEPPED GAIN MIXER - An amplified stepped gain mixer portion improves the signal-to-noise ratio of a receiver by using multiple gain states to improve linearity. The mixer portion includes an amplifier, a switch and two transistors. The amplifier output is coupled to the sources of the two transistors. An oscillating signal is present on the transistor gates. The transistor drains are coupled to one another through the switch when the switch is closed. The mixer portion operates in two modes. In a 1/2 mode, the mixer portion output current flows only through the first transistor and not through the second transistor because the switch is open. In a 2/2 mode, the mixer portion output current flows through both transistors. The mixer portion is configured such that the switch is closed when a switching signal is asserted. The switching signal is asserted when a bit of a mixer control register is written to. | 09-24-2009 |
20090238314 | DIVERSITY RECEIVING DEVICE - It is a theme of the present invention to provide a diversity receiving device capable of reducing a power consumption to the utmost extent while keeping a predetermined received quality without measurement of an electric field strength and a fading pitch. A decision about whether or not the diversity reception is executed is made by sensing a received quality. Also, a diversity gain is reduced by a predetermined value by controlling the diversity gain in the diversity reception, then a receiving operation of a predetermined branch or a branch whose received quality is low is stopped when the received quality at that time is in excess of a previously set value, and then a supply of power to all circuit or a partial circuit of the branch whose receiving operation is stopped is shut down. Accordingly, a power consumption can be reduced to the utmost extent while keeping a predetermined received quality. | 09-24-2009 |
20090245438 | Automatic Filter Control - A method and apparatus for controlling the power consumption of a receiver based on current operating conditions is described herein. A receiver according to the present invention applies a received signal to a variable filter. The received signal includes a desired in-band signal. Depending on the current operating conditions, the received signal may further include one or more unwanted out-of-band blocking signals. A filter controller controls one or more operating parameters of the variable filter to maintain the power ratio at the filter output of the power of the blocking signal(s) to the in-band signal at or below a desired level. In so doing, the present invention controls the receiver power consumption while still providing the desired receiver performance. | 10-01-2009 |
20090245439 | Output Buffer In The Presence Of Multiple Power Supplies - An output buffer providing a buffered output signal using multiple power supplies. The output signal is driven using a first power supply during a first interval, and using another (second) power supply during a second interval. In an embodiment, the first power supply is designed to be a high capacity supply, and drives the output signal during a substantial portion of a logic 0 to logic 1 transition. The second power supply is designed to be a low capacity supply, and drives the output during steady states (logic 0/logic 1). | 10-01-2009 |
20090252264 | LOW-COMPLEXITY DIGITAL RADIO INTERFACE - A radio integrated circuit includes, in part, an analog front end block, an analog-to-digital converter responsive to the analog-front end block, a digital signal processor responsive to the analog-to-digital converter and adapted to generate in-phase and quadrature signals, and a serial communication interface configured to receive and transmit the in-phase and quadrature signals. The serial communication interface supplies a gain control signal to the analog front end block when a switch disposed in the radio integrated circuit is in a first position. When the switch is in a second position, a gain control block disposed in the radio integrated circuit receives a gain control signal from the analog-to-digital converter and supplies the gain control signal to the analog front end block. The digital signal processor may be configured to interleave the in-phase and quadrature signals. | 10-08-2009 |
20090279647 | RECEPTION DEVICE, RECEPTION METHOD AND INTEGRATED CIRCUIT - A reception device for receiving an OFDM signal whose level is maintained constant by performing an AGC control which adjusts an amplification gain by means of a discrete gain value includes an equalization section operable to execute an equalization process of detecting, respectively, distortions of a plurality of reference subcarriers regularly included in the OFDM signal on which the fast Fourier transform has been performed, and of estimating, by means of an interpolation using the detected distortions, a distortion of the OFDM signal, which distortion is caused by transmission path propagation so as to correct the estimated distortion of the OFDM signal, and the equalization section corrects, by using the AGC control signal, an estimated error of the distortion of the OFDM signal, which distortion is caused by a discrete amplification gain variation of the OFDM signal. | 11-12-2009 |
20090279648 | DIGITAL AGC DEVICE - To keep the average amplitude of a signal substantially constant, a digital AGC device includes: a first multiplier for multiplying an in-phase signal and a filter output signal together and outputting a result of the multiplication; a second multiplier for multiplying a quadrature signal and the filter output signal together and outputting a result of the multiplication; a determination unit for making an enable signal valid and outputting the enable signal when the outputs from the first and second multipliers satisfy a condition defined according to a threshold signal; a sum-of-square averaging unit for obtaining and outputting a time average of a sum of squares of the respective outputs from the first and second multipliers when the enable signal is valid; a subtractor for obtaining and outputting a difference between a reference signal and the operation result of the sum-of-square averaging unit; and a loop filter for smoothing the output from the subtractor and outputting the smoothed output as the filter output signal. | 11-12-2009 |
20090285340 | RECEIVING AMPLITUDE CORRECTION CIRCUIT, RECEIVING AMPLITUDE CORRECTION METHOD, AND RECEIVER USING THE SAME - Input average levels and output average levels of digital channel filters | 11-19-2009 |
20090304130 | COMBINED DUAL FEED-FORWARD AND FEEDBACK ANALOG AND DIGITAL AUTOMATIC GAIN CONTROL FOR BROADBAND COMMUNICATION - An embodiment is a method and apparatus to process an input signal. An analog automatic gain control (AGC) processor controls an analog adjustable gain of the input signal using a feedback mechanism. The analog AGC processor generates a first signal. A processing circuit transforms the first signal into a second signal. A digital AGC processor controls a digital adjustable gain of the second signal using a feed-forward mechanism. | 12-10-2009 |
20090310723 | AUTOMATIC GAIN CONTROL CIRCUIT - Circuits (an AGC amplifier | 12-17-2009 |
20100014618 | RECEIVING DEVICE - When performing switching control of reception modes trading off reception sensitivity against power consumption in a reception environment, the receiving apparatus and control method of the present invention perform state transition without a reception error occurring due to switching control with the aid of a reception mode in which an intermediate reception performance is provided. The present invention is particularly useful to balance the reception performance with the battery duration in a battery-powered, portable receiving terminal such as a television receiver for a mobile terminal. | 01-21-2010 |
20100020906 | DIGITAL DEMODULATING APPARATUS, DIGITAL RECEIVER, CONTROLLING METHOD OF THE APPARATUS, COMPUTER PROGRAM PRODUCT, AND RECORDING MEDIUM RECORDING THEREON THE PRODUCT - A digital demodulating apparatus includes: plural circuit components constituting a tuning unit which performs a tuning process on a received signal and an intensity changing unit which changes the intensity of the received signal; a demodulator which performs a demodulating process on the signal which has been subjected to the tuning process by the tuning unit and whose intensity has been changed by the intensity changing unit; a power changing unit which changes the magnitude of power supplied to the circuit components; and a gain changing unit which changes a gain when the intensity changing unit changes the intensity of the received signal, wherein, the intensity changing unit includes a variable-gain circuit whose gain is variable, the gain changing unit changes the gain of the variable-gain circuit by a predetermined amount substantially at the same time as the power changing unit changes the power supplied to the circuit components, and the predetermined amount is arranged so that an overall gain of the circuit components is unchanged before and after changing the power and the gain by the power changing unit and the gain changing unit. | 01-28-2010 |
20100034327 | JOINT TIME-FREQUENCY AUTOMATIC GAIN CONTROL FOR WIRELESS COMMUNICATION - Techniques for performing joint time-frequency automatic gain control (AGC) by a receiver are described. In an aspect, the receiver may transform time-domain samples with a fast Fourier transform (FFT) to obtain frequency-domain symbols and may detect for saturation of the frequency-domain symbols. The receiver may adjust a gain based on whether saturation is detected and may apply the gain prior to the FFT. In one design, the receiver may use a nominal value for a setpoint if saturation is not detected and may reduce the setpoint if saturation is detected. The receiver may adjust the gain based on the setpoint, which may determine the average power of the time-domain samples. In another design, the receiver may determine the gain based on a gain offset and may vary the gain offset based on whether saturation is detected. For both designs, the receiver may apply the gain on digital samples and/or an analog signal prior to the FFT. | 02-11-2010 |
20100040178 | Transceiver with Receive Path Performance Diversity and Combiner with Jammer Detect Feedback - Methods and apparatus for implementing a wireless communication transceiver having receive path performance diversity. The transceiver implements a plurality of signal paths that can be configured as diversity receive paths. Each of the plurality of signal paths includes a distinct RF filter. Each RF filter can be configured to provide a distinct jammer rejection profile. Each receive path also includes a jammer detector, that can be a multiple level jammer detector. Each jammer detector operates to control a level of processing gain applied to the signals in its receive path. The multiple gain scaled receive signals can be combined in a coherent combiner before being routed for further processing. | 02-18-2010 |
20100046677 | Amplifier with Single-ended Input and Differential Output - An amplifier provided according to an aspect of the present invention includes a set of passive impedances forming a tuned load to a gain stage and also to provide a 180 degrees phase shifted signal of a gain signal received from the gain stage. The output of the gain stage and the 180 degrees phase shifted signal together form a differential amplified signal corresponding to an input signal gained by the gain stage. In an embodiment, the set of passive impedances includes a three terminal centre tapped inductor in combination with a capacitor, together operating as a filter to pass only a desired frequency band. The windings of the inductor may be designed to provide mutual coupling between two portions such that there is a negative correlation between the strength of the received gained signal and the 180 degree phase shifted signal. | 02-25-2010 |
20100046678 | Techniques to improve digital demodulator performance utilizing automatic gain control target adjustment - An embodiment of the present invention provides an apparatus, comprising a digital demodulator including an automatic gain control (AGC) circuit with a self-adapting target to provide optimum performance under all signal conditions. | 02-25-2010 |
20100046679 | AUTOMATIC GAIN CONTROL SYSTEM - An apparatus comprising an amplifier configured to amplify a received signal; a filter coupled to an output of said amplifier and configured to filter the amplified signal; and a controller configured to control a first gain for said amplifier in dependence on a characteristic of the amplified signal and a characteristic of said filtered received signal. | 02-25-2010 |
20100067622 | Circuit, Controller and Methods for Dynamic Estimation and Cancellation of Phase and Gain Imbalances in Quadrature Signal Paths of a Receiver - A controller and a circuit work together to enable a selective and dynamic adjustment to correct phase and gain imbalances in quadrature signal paths of a receiver. Under select conditions, it has been determined that statistical estimates of gain and phase imbalance can be applied to adjust signals in the quadrature signal paths of a receiver. The controller validates the select conditions before updating the estimate of the gain imbalance and the estimate of the phase imbalance. The controller directs a compensator under select operating conditions such that validated dynamic estimates of the gain and phase imbalance or calibration data is applied to the quadrature signal paths. The controller disables the compensator and enables an estimator and a calculator when estimates are unavailable for the present operating conditions. | 03-18-2010 |
20100067623 | Method for setting Inter-Packet Gain - An packet detection controller accepts an input from an AGC controller which indicates the presence of an increased signal energy and also completion of an AGC process and generates an output to suspend the AGC process. The packet detection controller also receives a plurality of IQ receiver streams and forms a single stream for use by a packet detector, which is controllable by an SNR_MODE indicating whether the signal to noise ratio is above or below a particular threshold, and a PD_RESET signal indicating that no packet detection should occur. The controller also receives a PACKET_DET signal indicating that packet detection is completed. The packet detection controller examines the incoming receiver streams and suspends AGC process if a packet detect is generated, or suspends the packet detector if an AGC process is required. | 03-18-2010 |
20100067624 | Process for Packet Detection - An packet detection controller accepts an input from an AGC controller which indicates the presence of an increased signal energy and also completion of an AGC process and generates an output to suspend the AGC process. The packet detection controller also receives a plurality of IQ receiver streams and forms a single stream for use by a packet detector, which is controllable by an SNR_MODE indicating whether the signal to noise ratio is above or below a particular threshold, and a PD_RESET signal indicating that no packet detection should occur. The controller also receives a PACKET_DET signal indicating that packet detection is completed. The packet detection controller examines the incoming receiver streams and suspends AGC process if a packet detect is generated, or suspends the packet detector if an AGC process is required. | 03-18-2010 |
20100067625 | Level Sensitive Packet Detector - An packet detection controller accepts an input from an AGC controller which indicates the presence of an increased signal energy and also completion of an AGC process and generates an output to suspend the AGC process. The packet detection controller also receives a plurality of IQ receiver streams and forms a single stream for use by a packet detector, which is controllable by an SNR_MODE indicating whether the signal to noise ratio is above or below a particular threshold, and a PD_RESET signal indicating that no packet detection should occur. The controller also receives a PACKET_DET signal indicating that packet detection is completed. The packet detection controller examines the incoming receiver streams and suspends AGC process if a packet detect is generated, or suspends the packet detector if an AGC process is required. | 03-18-2010 |
20100067626 | Packet Acquisition Processor - An packet detection controller accepts an input from an AGC controller which indicates the presence of an increased signal energy and also completion of an AGC process and generates an output to suspend the AGC process. The packet detection controller also receives a plurality of IQ receiver streams and forms a single stream for use by a packet detector, which is controllable by an SNR_MODE indicating whether the signal to noise ratio is above or below a particular threshold, and a PD_RESET signal indicating that no packet detection should occur. The controller also receives a PACKET_DET signal indicating that packet detection is completed. The packet detection controller examines the incoming receiver streams and suspends AGC process if a packet detect is generated, or suspends the packet detector if an AGC process is required. | 03-18-2010 |
20100080327 | METHOD AND DEVICE FOR AUTOMATIC GAIN CONTROL - A method for automatic gain control used in a receiver of a multi-carrier telecommunication system, the method comprising: receiving an input signal digitalized by an A/D converter; determining distribution of the input signal; and controlling gain of a variable gain amplifier as a function of the determined distribution. | 04-01-2010 |
20100086086 | GAIN CONTROL IN A COMMUNICATION CHANNEL - Methods and apparatuses for reducing DC offsets in a communication system are described. In a first aspect, a feedback loop circuit reduces DC offset in a wireless local area network (WLAN) receiver channel. The frequency response of the feedback loop circuit can be variable. In a second aspect, a circuit provides gain control in a WLAN receiver channel. The stored DC offset is subtracted from the receiver channel. First and second automatic gain control (AGC) amplifiers are coupled in respective portions of the receiver channel. In a third aspect, a feedback loop circuit reduces DC offset in a WLAN receiver channel. The feedback loop circuit includes a storage element that samples and stores receiver channel DC offset. The loop is opened, and the DC offset stored in the storage element is subtracted from the receiver channel. Circuits for monitoring DC offset, and for providing control signals for controlling the frequency response of the DC offset reducing circuits are also provided. | 04-08-2010 |
20100091917 | DIGITAL BROADCASTING RECEIVING APPARATUS - A digital broadcasting receiving apparatus has a signal level detecting circuit for performing gain control to maintain a power level of a received signal at a fixed level, for making a decision as to whether an automatic gain control level of the gain control is greater than a prestored threshold or not, and for outputting the decision result; a peak detecting section for detecting a peak of a power level within a band of the received signal, and for outputting the detected peak; an abnormal peak deciding section for making a decision as to whether a peak greater than a prestored threshold is present in peaks output from the peak detecting section or not, and for outputting the decision result; a specified peak deciding section for making a decision within a specified frequency band as to whether a peak exceeding a prestored threshold is present in the peaks output from the peak detecting section or not, and for outputting the decision result; a prescribed in-band power deciding section for making a decision as to whether the sum total of all powers within a prescribed band is greater than a prestored threshold or not, and for outputting the decision result; and makes a decision as to whether a signal being received is a digital broadcasting signal or not according to the decision results output from the signal level detecting circuit, the abnormal peak deciding section, the specified peak deciding section and the prescribed in-band power deciding section. | 04-15-2010 |
20100098196 | APPARATUS AND METHOD FOR AUTOMATICALLY CONTROLLING GAIN IN PORTABLE COMMUNICATION SYSTEM - An apparatus and method for automatically controlling a gain in a portable communication system are provided. The apparatus includes a channel determiner for controlling a fading margin depending on the channel variation amount to control the limited total dynamic range of the ADC. | 04-22-2010 |
20100104052 | AUTOMATIC GAIN CONTROL APPARATUS AND METHOD FOR COMPRESSED MODE IN MIMO SYSTEM - An automatic gain control apparatus and method for a compressed mode in a MIMO system are provided. The method includes determining power at a first frequency band using a first receiver, simultaneously determining power at a second frequency band using a second receiver in a compressed mode, if the second receiver changes a power determination frequency band into the first frequency band, correcting the power determination value of the first receiver, and applying the corrected power determination value of the first receiver to the second receiver. | 04-29-2010 |
20100119020 | Blanking Techniques in Receivers - An aspect of the present invention detects the presence of interference by examining an input signal received on an input path, and blanks the receiver if interference is detected. Information contained in the input signal may be recovered otherwise. In an embodiment, the duty cycle of a jamming signal is determined by examining the input signal, and a threshold strength having a positive correlation with the duty cycle is determined. If the strength of the jamming signal during the on-interval (start and end of the interference in each cycle) is greater than the threshold strength, then only the receiver is blanked. Otherwise, no blanking is performed, and only the gain of an amplifier in the path from the input path to a baseband processor is reduced. According to another aspect, one or more cycles of the interference is used to detect the start of interference and the receiver is blanked when interference is present. | 05-13-2010 |
20100128826 | RECEIVING DEVICE AND RECEIVING METHOD - An AGC unit | 05-27-2010 |
20100142661 | DEVICE FOR GAIN CONTROL AND METHOD FOR RECEIVING SIGNAL - The present invention relates to a device for gain control and a method for receiving a signal. The device for gain control according to the present invention includes a map interpreter that detects beamforming symbol periods in wireless signals, a power calculator that calculate the average power of the beamforming symbol periods in response to outputs of the map interpreter, a gain calculator that calculates gain control signals on the basis of the output signals of the power calculator, and a switch that outputs gains from the gain control signals, in which the wireless signals are corrected on the basis of the gains. | 06-10-2010 |
20100142662 | ADAPTIVE CONTROL BASED ON RETROSPECTIVE COST OPTIMIZATION - A discrete-time adaptive control law for stabilization, command following, and disturbance rejection that is effective for systems that are unstable, MIMO, and/or nonminimum phase. The adaptive control algorithm includes guidelines concerning the modeling information needed for implementation. This information includes the relative degree, the first nonzero Markov parameter, and the nonminimum-phase zeros. Except when the plant has nonminimum-phase zeros whose absolute value is less than the plant's spectral radius, the required zero information can be approximated by a sufficient number of Markov parameters. No additional information about the poles or zeros need be known. Numerical examples are presented to illustrate the algorithm's effectiveness in handling systems with errors in the required modeling data, unknown latency, sensor noise, and saturation. | 06-10-2010 |
20100142663 | APPARATUS AND METHOD FOR RECEIVING SIGNAL IN WIRELESS COMMUNICATION SYSTEM USING MULTI ANTENNA - Provided are apparatus and method for receiving signals in a wireless communication system. A receiving apparatus including a plurality of variable gain amplifier units configured to respectively control the gains of radio frequency (RF) signals received respectively through a plurality of antennas, and a plurality of analog-to-digital converters configured to respectively convert the output signals of the respective variable gain amplifiers into digital signals, includes: an automatic gain controller configured to calculate the gain values of the respective gain control amplifier units by receiving the digital signals outputted from the respective analog-to-digital converters, select the minimum gain value among the calculated gain control values, and calculate the differences between the minimum gain value and the other gain values; and a noise matching amplifier configured to attenuate the digital signals outputted from the respective analog-to-digital converters according to the calculated difference values. | 06-10-2010 |
20100150284 | GPS RECEIVER WITH IMPROVED IMMUNITY TO BURST TRANSMISSIONS - GPS signals are typically weak and thus easily interfered with by other radio transmissions in the same or adjacent frequency bands. Interference can be especially problematic when the GPS receiver is co-located with a communications device that includes a radio transmitter, such as a cellular telephone. The transmitted signal from the co-located communication device can overload (or saturate) the GPS receiver front-end designed to receive weak GPS signals. In such a situation no useful information can be extracted from the received GPS signals originating from the GPS satellites. Described herein is a novel apparatus and method that can be used to minimize the effect of co-located interference on a GPS receiver. | 06-17-2010 |
20100158166 | Noise Injection Circuit and Method for Signal Processing - A signal processing circuit is configured to calculate a gain ratio to efficiently reduce a peak to average signal ratio for an input signal by identifying signal peaks and determining the signal peak magnitudes. A window function in combination with the gain ratio is applied to a portion of the input stream having a peak signal to create a cancellation pulse to be applied to that peak signal. The cancellation pulse phase is aligned with the signal phase, thereby causing minimal phase distortion in the resultant output signal and accurate peak cancellation. The cancellation pulse can also include a finite impulse response filter portion to efficiently handle wide bandwidth signals. The hardware may be configured to process multiple signal streams in parallel to reduce hardware requirements. An algorithm can determine the effect of multiple corrections to the input stream to avoid overcorrection in the signal processing process. | 06-24-2010 |
20100158167 | AUTO GAIN CONTROL METHOD IN DIGITAL COMMUNICATION SYSTEM - Provided is an auto gain control method in a digital communication system. The auto gain control method checks a distribution of a signal and a distribution of a signal envelope during a regular check interval, and determines a state of a current gain value from the distribution of the signal and the distribution of the signal envelope which are obtained through the checking of the distribution. The auto gain control method controls a gain value for auto gain control according to the determined state of the current gain value. | 06-24-2010 |
20100158168 | METHOD AND SYSTEM FOR AUTOMATIC GAIN CONTROL DURING SIGNAL ACQUISITION - The disclosure is directed to a mobile communication device that includes automatic gain control (AGC) circuitry and operates in either a tracking mode or an acquisition mode. A received signal is sampled n times to calculate an energy estimate that is used to set the gain control values within the AGC circuitry. The value of n varies depending on whether the handset is operating in the acquisition mode or the tracking mode. Acquisition mode is typically considered to be the mode prior to coarse timing acquisition, also referred to as frame acquisition. | 06-24-2010 |
20100172450 | Circuits, Systems, and Methods for Managing Automatic Gain Control in Quadrature Signal Paths of a Receiver - A system provides closed-loop gain control in a WCDMA mode and open loop control in an EDGE/GSM mode. Gain control is distributed across analog devices and a digital scaler in a wireless receiver. In the WCDMA mode, a loop filter generates an error signal that is forwarded to analog and digital control paths. The analog control path includes a first adder, a programmable hysteresis element, and a lookup table. The analog control signal is responsive to thresholds, which when used in conjunction with a previous gain value determine a new gain value. The digital control path includes a second adder, a programmable delay element, and a converter. A control word is responsive to a difference of the error signal, a calibration value, and the analog control signal. Blocker detection is provided in the WCDMA mode of operation. A controller sets system parameters using a state machine. | 07-08-2010 |
20100172451 | VARIABLE BANDWIDTH AUTOMATIC GAIN CONTROL - Provided is automatic gain control (AGC) in which a feedback filter has a parameter that is changed based on information regarding data-packet boundaries. In one representative embodiment, the bandwidth of the filter temporarily is increased, or the time constant of the AGC filter temporarily is decreased, within a vicinity of each actual or potential packet boundary. | 07-08-2010 |
20100172452 | OFDMA RECEPTION DEVICE AND OFDMA RECEPTION METHOD - A base station ( | 07-08-2010 |
20100189203 | Automatic Gain Control Based on Bandwidth and Delay Spread - A gain control circuit adjusts the signal level of a received signal responsive to the bandwidth a received signal and/or the delay spread of the channel in which the signal has propagated. The bandwidth and delay spread are evaluated to estimate the amount of signal variation that is expected due to fast fading. Adjustments to the signal level are then made to avoid clipping while at the same time ensuring that the dynamic range of a receiver component is efficiently utilized. | 07-29-2010 |
20100220820 | Receiver with Mixed-Mode Automatic Gain Control - In an embodiment, set forth by way of example and not limitation, a receiver with automatic gain includes a receiver stage, an AGC stage, and a digital processor which collectively define an AGC loop. Preferably, the AGC stage has a control circuit and a feedback circuit with matched transfer characteristics. A digital processor is operative to develop a gain control signal to set a desired gain level of the receiver stage to an optimal level based upon a waveform analysis derived from the gain feedback signal. | 09-02-2010 |
20100220821 | NARROW-BAND INTERFERENCE CANCELLER - The disclosure is directed to a receiver, and methods therefor, including an automatic gain control circuit with a first digital variable gain amplifier that outputs digital samples based on a modulated wireless signal, an interference canceller configured to filter the digital samples using a least mean squares algorithm to reduce narrowband interference, and a second DVGA configured to amplify the filtered digital samples. | 09-02-2010 |
20100239055 | EMULATION OF N-BITS UNIFORM QUANTIZER FROM MULTIPLE INCOHERENT AND NOISY ONE-BIT MEASUREMENTS - Certain aspects of the present disclosure relate to a method for emulating N-bits uniform quantization of a received pulse signal by using one-bit signal measurements. | 09-23-2010 |
20100246734 | RECEIVER - A receiver that receives a train of a plurality of symbols representing digital data, includes: an isolated pulse detector that detects whether the digital data includes an isolated pulse in the symbol train, respectively; a phase detector that detects a timing at which the level of the symbols changes; a symbol value converter that converts the symbols into logical values on the basis of the timing detected by the phase detector; and a data selector that selects a logical value of the isolated pulse instead of the logical value converted by the symbol value converter when the isolated pulse detector detects the digital data containing the isolated pulse. | 09-30-2010 |
20100272219 | Method and Device for Automatic Gain Control - A method and apparatus for adjusting the gain of an amplifier ( | 10-28-2010 |
20100296612 | AUTOMATIC GAIN CONTROL CIRCUIT AND RECEIVER CIRCUIT - An automatic gain control circuit configured so that a response time is reduced until a gain converges is disclosed. A variable gain amplifier is configured so that a gain is varied by a first control signal. A detector circuit detects an intensity of an output signal of the variable gain amplifier. A comparator compares an output signal of the detector circuit with a reference signal. An integrator integrates a signal corresponding to an output signal of the comparator, and outputs an integration result to the variable gain amplifier as the first control signal. A loop gain control unit, connected between the comparator and the integrator, is configured so that a loop gain is varied by a second control signal. A level detection unit detects an intensity of an output signal of the integrator and outputs a detection result to the loop gain control unit as the second control signal. | 11-25-2010 |
20100296613 | MULTIPLE SIGNAL RECEIVING - Presently disclosed are a multichannel receiver and a method of operating it. The multichannel receiver includes a first channel circuit of N channel circuits. The first channel circuit includes a band pass (BP) filter and a gain control feedback circuit configured to adjust a signal provided by the BP filter with respect to a reference voltage. | 11-25-2010 |
20100303180 | GAIN CONTROL FOR A RECEIVER IN A MULTI-CARRIER COMMUNICATION SYSTEM - A receiver in an OFDM communication system includes a power detector and a gain controller. The power detector detects for total received power of a received OFDM signal, e.g., by computing the power of the data samples from an ADC and averaging the power. The gain controller adjusts the gain of the receiver in discrete gain steps and in one direction, e.g., from the lowest gain state to the highest gain state, based on the detected total received power. The gain controller initializes the receiver to the lowest gain state. Thereafter, the gain controller detects for low total received power, e.g., by comparing the detected total received power against a predetermined threshold. The gain controller transitions to a higher gain state if low total received power is detected and maintains the current gain state otherwise. | 12-02-2010 |
20100316173 | SIGNAL LEVEL ADJUSTER WITH INCREMENTAL GAIN ADJUSTMENTS, FOR RF COMMUNICATION EQUIPMENT - A signal level adjusting device (AD), for RF communication equipment arranged to received primary RF signals, comprises i) a tuner (TU) comprising a gain control means (SI,R), arranged to define a first or second digital command signal respectively each time it receives a first or second digital control signal respectively, and a gain adjusting means (VGA) arranged to decrease or increase respectively its gain by a fixed value when the command signal defined by the gain control means (SI,R) is a first or second command signal respectively, in order to adjust the level of the received primary RF signals, and ii) a demodulator (DEM) comprising a level control means (LCM1) arranged to generate a first or second digital control signal respectively each time it detects an increase or decrease respectively of the level of secondary signals representative of the adjusted signals output by the tuner (TU). | 12-16-2010 |
20100316174 | DISCRETE TIME FILTER AND RECEIVER INCLUDING THE SAME - A discrete time filter includes a plurality of sampling cells and a first dummy sampling cell. Each of the sampling cells performs a current mode sampling operation based on current input to an input terminal in response to a corresponding one of a plurality of sampling clock signals and is reset in response to a corresponding one of the plurality of sampling clock signals and a first dummy sampling clocks. The first dummy sampling cell alternately performs with the first sampling cell the current mode sampling operation based on current input to the input terminal in response to the first dummy sampling clock signal and is alternately reset with the first sampling cell in response to the first sampling clock signal. | 12-16-2010 |
20100322360 | RECEIVER WITH ANALOG AND DIGITAL GAIN CONTROL, AND RESPECTIVE METHOD - The receiver comprises a first amplifier, a mixer for downconverting a wanted communications channel, a second amplifier, a demodulator and a digital controller providing a digital gain setting for the second amplifier by means a digital gain control after a selection of the wanted communications channel, and providing an analog gain setting for the first amplifier by means of an analog gain control during demodulation of the wanted communications channel. The digital gain setting is in particular freezed during demodulation of the wanted communications channel and the digital controller provides a re-calibration of the digital gain setting only, when the analog gain control is out of its control range. Applications are for example for direct conversion digital satellite receivers for reception of DVB-S, DVB-S2 or ABS-S television channels. | 12-23-2010 |
20100322361 | DIGITAL RECEIVER - In a digital receiver, a noise attenuation and signal magnitude mapping variable amplifying unit includes a filter and an amplifier, amplifies and band-bass filters an analog signal and attenuating white noise and an interference signal other than a band signal. An ADC performs sub sampling on a carrier frequency of a desired signal and performs oversampling on the band of the desired signal by using a sampling frequency to convert the analog signal which has passed through the noise attenuation and signal magnitude mapping variable amplifying unit into a digital signal of a direct conversion frequency band or an intermediate frequency band. The ADC has a dynamic range for processing both the desired signal and an undesired signal adjacent to the desired signal. A digital signal processing unit converts a signal frequency of the digital signal or digital-filters an undesired signal within the digital signal and processes the digital signal by digitally adjusting a gain. | 12-23-2010 |
20100329397 | ESTIMATION AND COMPENSATION METHOD FOR IQ IMBALANCE - The present invention relates to a method and apparatus for estimating and compensating IQ imbalance of a baseband sampling digital communication receiver in digital time domain. Specifically, after an analog-to-digital converter (ADC) in the baseband sampling system, a structure including a crosstalk gain estimator, a Q-path gain estimator, an IQ imbalance compensator, and a lock detector is utilized to execute IQ imbalance estimation and compensation. In contrast to real-time frequency domain estimator/compensator, the present invention requires very little or no additional memory and delay processing, and therefore provides the estimation apparatus and method with convenience. | 12-30-2010 |
20110013733 | VARIABLE GAIN CONTROL FOR HIGH SPEED RECEIVERS - A high speed receiver is provided using two parallel processing paths to enable rapid variable gain control. The parallel processing paths include a first processing path using a high resolution Discrete Fourier Transform (DFT), and a second processing path using a reduced DFT requiring fewer samples than the high resolution DFT. An initial sample of the data is processed using the second processing path with the reduced DFT by comparing a Fourier transform of the initial sample with predetermined threshold values. As a result of the comparison of the Fourier transform of the initial sample with the predetermined threshold values, a gain determination block determines whether a requirement exists for gain ranging. If gain ranging is needed, the gain of the data signal is adjusted and the gain ranging process repeats. | 01-20-2011 |
20110026651 | AUTOMATIC GAIN CONTROL IN A RECEIVER - Automatic gain control in a receiver. A method for controlling operating range of an analog-to-digital converter (ADC) by an automatic gain control circuit includes estimating a peak-to-average ratio corresponding to an analog signal from digital samples of the analog signal. The method includes determining a peak value corresponding to the analog signal based on the peak-to-average ratio. Further, the method includes maintaining magnitude of the analog signal at an input of the ADC and gain of the receiver based on the peak value. | 02-03-2011 |
20110033013 | RADIO RECEIVER GAIN CONTROL - A radio receiver ( | 02-10-2011 |
20110075772 | SYSTEM AND METHOD FOR DYNAMIC OUTPUT BACK-OFF - A device is provided for use with an input signal including a first packet of a first modulation type in series with a second packet of a second modulation type. The device includes a gain adjustment portion and a gain portion. The gain adjustment portion can output a first gain adjustment signal based on the first packet or can output a second gain adjustment signal based on the second packet. The gain portion can output a first signal corresponding to the first packet and can output a second signal corresponding to the second packet. The first signal is based on the input signal and a first gain factor. The second signal is based on the input signal and a second gain factor. The first gain factor is based on the first gain adjustment signal. The second gain factor is based on the second gain adjustment signal. | 03-31-2011 |
20110085625 | RECEIVER AND SEMICONDUCTOR DEVICE - A receiver includes an automatic gain control (AGC) loop and a filter group that is arranged downstream of the AGC loop. The filter group includes an active filter. The receiver further includes a power difference detector and a switch circuit. The power difference detector detects a power difference between intermediate and output nodes of the filter group to detect presence of an interference wave that is different from a desired wave and that has a frequency near that of the desired wave. The switch circuit switches an operation to suppress a convergence power of the AGC loop when the power difference detector detects the interference wave. | 04-14-2011 |
20110116582 | DIGITAL AUTOMATIC GAIN CONTROL - An automatic gain control (“AGC”) system. The system includes a first multiplier, an envelope detector, a summation module, a filter module, a convergence module, and a feedback module. The convergence module includes a convergence control module and a second multiplier. The feedback module includes an accumulator, a scalar multiplier module, and a third multiplier. The system is configured to adjust or modify its convergence speed according to the state of convergence of the AGC system, and the convergence speed of the AGC system is substantially independent of a signal level of the received signal. | 05-19-2011 |
20110150152 | SYSTEMS AND METHODS PROVIDING FREQUENCY-DOMAIN AUTOMATIC GAIN CONTROL (AGC) - A method for Automatic Gain Control (AGC) in a receiver is performed by a circuit having an inner loop and an outer loop. The method includes performing an outer loop energy detection, mitigating interference using the outer loop energy detection, and performing a frequency domain energy measurement in the inner loop. The method also includes adjusting a digital gain component in the inner loop and an analog gain component in the outer loop in response to the frequency domain energy measurement. | 06-23-2011 |
20110176644 | AUTOMATIC GAIN CONTROL IN RADIO FREQUENCY RECEIVERS - An automatic gain controller (AGC) in white space devices is configured with two operational modes. When entering a quiet time of the white space device, the AGC selects the first operational mode. The first operational mode is associated with detecting licensed signals on one or more white space channels by testing a measured received signal strength indicator (RSSI) value to determine which one of a number of the AGC's gain states should be used corresponding to a gain for application to input white space signals on the whitespace channels. When not in the quiet time, the AGC enters a second operational mode. The second operational mode sets a fixed gain state of the AGC's multiple gain states to apply in selecting one of the white space channels on which no licensed signals were detected. | 07-21-2011 |
20110182388 | APPARATUS FOR REJECTING IMAGE IN RECEIVER - The present invention relates to an apparatus for rejecting images in a receiver. | 07-28-2011 |
20110188616 | RADIO TRANSMITTING APPARATUS AND RADIO TRANSMISSION METHOD - A radio transmitting apparatus that has a plurality of antennas and changes the number of modulated signals transmitted simultaneously according to the propagation environment and so forth. A transmission power changing section | 08-04-2011 |
20110235758 | Mixed-Mode Receiver Circuit Including Digital Gain Control - A receiver circuit includes an analog front-end and a digital processing unit. The analog front-end includes an input for receiving a radio frequency (RF) signal, a first control input for receiving a gain adjustment signal, a second control input for receiving a timing signal, and a signal output for providing a digital intermediate frequency (IF) signal. The analog front-end updates gains of a plurality of gain stages according to the gain adjustment signal and in synchronism with the timing signal. The digital processing unit is configured to produce at least one output signal derived from the digital IF signal. The digital processing unit includes a timing recovery circuit configured to generate the timing signal based on the digital IF signal to control timing of the updating gains of each of the plurality of adjustable gain stages. | 09-29-2011 |
20110255642 | RECEIVING APPARATUS, AND COMPUTER READABLE MEMORY MEDIUM THAT STORES A PROGRAM - Suitable gain control is achieved at low cost. | 10-20-2011 |
20110274222 | DIGITAL FREQUENCY CHANNELIZER - A method and apparatus provide digital frequency channelization of a digitally sampled input stream having a first bandwidth. The method and apparatus are implementable in software, firmware or hardware and convert a first set of real samples from the input stream into a first plurality of complex samples with a first functional block performing filtering, decimation and tuning functions, convert the first plurality of complex samples into a first pair of consecutive USB and a first pair of consecutive LSB complex samples with a second functional block performing filtering, decimation and tuning functions, and convert the first pair of consecutive USB and the first pair of consecutive LSB complex samples into a two pairs of complex USB and LSB complex samples with a pair of third functional blocks performing filtering, decimation and tuning functions, and apply the two pairs of complex USB and LSB complex samples to a string of n pairs (for n greater than or equal to one) third functional blocks each performing filtering, decimation and tuning functions. | 11-10-2011 |
20110274223 | AGC TUNER FOR MIMO SYSTEMS - The present disclosure provides methods and systems for automatic gain control (AGC) in a multiple input multiple output (MIMO) system having two or more receiver chains, each receiver chain including a receiver and an AGC module. The AGC system accepts a signal at a compensation module associated with the receiver chain and calculates one or more gains using the AGC module associated with the receiver chain. Then, an estimation module computes a scaling factor for each receive chain from the gains and transmits the scaling factor to the compensation module of the respective receiver chain, which requantizes the signal based on the scaling factor. | 11-10-2011 |
20110274224 | METHOD AND DEVICE TO CONTROL THE GAIN OF A RADIO RECEIVER - An automatic gain control (AGC) method and system for a radio receiver are proposed in which the ACG comprises two AGC loops; a first loop controlling signal gain in the analogue portion of the radio receiver, a second loop controlling gain in the digital domain after digitization of the received signal. The analogue AGC loop has a slower response time than the digital AGC loop. When applied to a multi-branch diversity receiver, each branch has its own digital AGC loop, but the analogue gain can be common to all branches, based on measurement of the analogue signal in each branch. | 11-10-2011 |
20110280350 | FIXED POINT FIR FILTER WITH ADAPTIVE TRUNCATION AND CLIPPING AND WIRELESS MOBILE STATION USING SAME - A fixed point finite impulse response (FIR) filter comprising: 1) an input stage for receiving an input signal as a sequence of input samples comprising: i) delay elements connected in series for receiving and shifting N sequential input samples; ii) multipliers, each multiplier receiving a selected one of the N sequential input samples from the delay elements and multiplying the selected input sample by a corresponding coefficient to produce an intermediate product; and iii) a summer for receiving and adding N intermediate products from the multipliers to produce an output sum signal comprising a sequence of output sum samples; and 2) an output stage for truncating k least significant bits (LSBs) from each of the output sum samples, wherein k is a variable number. | 11-17-2011 |
20110286557 | RECEIVING APPARATUS - According to one embodiment, a variable gain amplifier amplifies a reception signal, a mixer performs frequency conversion of the reception signal amplified by the variable gain amplifier, a detector detects the reception signal subjected to the frequency conversion, an automatic gain control unit controls, based on a detection level by the detector, a gain of the variable gain amplifier, and an operating-point optimizing unit optimizes an operating point of the variable gain amplifier by controlling, based on a reception state of the reception signal, an output signal from the mixer. | 11-24-2011 |
20110299640 | DEVICE AND METHOD FOR GATHERING ENSEMBLE DATA SETS - An ensemble detector uses calibrated noise references to produce ensemble sets of data from which properties of non-stationary processes may be extracted. The ensemble detector comprising: a receiver; a switching device coupled to the receiver, the switching device configured to selectively connect each of a plurality of reference noise signals to the receiver; and a gain modulation circuit coupled to the receiver and configured to vary a gain of the receiver based on a forcing signal; whereby the switching device selectively connects each of the plurality of reference noise signals to the receiver to produce an output signal derived from the plurality of reference noise signals and the forcing signal. | 12-08-2011 |
20110305305 | REDUCING SWITCHING NOISE - The present solution relates to a method in a first communication node ( | 12-15-2011 |
20110311006 | AUTOMATIC GAIN CONTROL METHOD AND APPARATUS FOR WIRELESS COMMUNICATION SYSTEMS - A system and method are provided for automatic gain control (AGC) using an adaptive reference and a threshold. An adaptive reference allows for adjusting the target power based on variations in operating parameters and conditions, such as a change to a modulation schemes which requires a different signal to noise ratio (SNR) to maintain performance. A gain adjustment threshold allows for rapid AGC response while reducing the potential effects of hysterisis. AGC levels may be changed during symbol prefixes or suffixes, and avoided during a data portion of a signal. Embodiments allow for symbol-by symbol AGC changes in OFDM, OFDMA, and TDD systems. | 12-22-2011 |
20120002765 | AUTOMATIC GAIN CONTROL AND BASEBAND PREINTEGRATION TO REDUCE COMPUTATION REQUIREMENTS AT LOWER DATA RATES - A method for processing baseband signals according to one embodiment includes receiving I and Q baseband signals; and selectively reducing an amount of samples of the baseband signals to be processed in a correlator, wherein the reduction rate is based on a data rate of the baseband signals. A preintegrator module according to one embodiment includes an automatic gain control section for performing automatic gain control on I and Q baseband signals; a first preintegrator coupled to an output of the automatic gain control section, the first preintegrator being for selectively reducing an amount of samples in the I baseband signal based on a data rate of the I baseband signal; and a second preintegrator coupled to an output of the automatic gain control section, the second preintegrator being for selectively reducing an amount of samples in the Q baseband signal based on a data rate of the Q baseband signal. Additional systems and methods are also presented. | 01-05-2012 |
20120002766 | RSSI ESTIMATE ON VARIABLE LENGTH CORRELATOR OUTPUT - A method for estimating a strength of a radio frequency signal according to one embodiment includes receiving a correlator magnitude signal from a correlator module; performing a gain scaling on the correlator magnitude signal; and averaging the scaled correlator magnitude signal or value associated therewith to generate an output indicative of a strength of the signal. Such methodology may also be implemented as a system using logic for performing the various operations. Additional systems and methods are also presented. | 01-05-2012 |
20120014484 | METHOD AND APPARATUS FOR PERFORMING TEMPERATURE COMPENSATION - Various methods for performing amplifier gain compensation to correct for variations in temperature are provided. One example method includes modifying a gain adjustment value based on a current temperature reading, receiving a signal, | 01-19-2012 |
20120014485 | SIGNAL PROCESSING DEVICE - A prediction error calculating unit | 01-19-2012 |
20120020441 | FIXED POINT FIR FILTER WITH ADAPTIVE TRUNCATION AND CLIPPING AND WIRELESS MOBILE STATION USING SAME - A fixed point finite impulse response (FIR) filter comprising: 1) an input stage for receiving an input signal as a sequence of input samples comprising: i) delay elements connected in series for receiving and shifting N sequential input samples; ii) multipliers, each multiplier receiving a selected one of the N sequential input samples from the delay elements and multiplying the selected input sample by a corresponding coefficient to produce an intermediate product; and iii) a summer for receiving and adding N intermediate products from the multipliers to produce an output sum signal comprising a sequence of output sum samples; and 2) an output stage for truncating k least significant bits (LSBs) from each of the output sum samples, wherein k is a variable number. | 01-26-2012 |
20120039425 | ZERO-CROSSING GAIN CONTROL SYSTEM AND ASSOCIATED METHODS - A zero-crossing gain control system is disclosed herein. The system comprises a gain control unit for amplifying an input signal to an output signal, a zero-crossing monitoring circuit for monitoring the input signal or output signal, and a register for latching the digital control signal and generating a gain control signal that controls the gain control unit. The system may further comprise a maximum write time setting circuit for generating a write signal. The digital control signal is written into the register when a zero-crossing state is monitored or a maximum write time since a change occurred on of the digital control signal is expired. An automatic gain control system is also disclosed herein and further comprises a peak detecting circuit for detecting the level of output signal, a logic circuit for lowering or restoring the digital control signal according to the result from the peak detecting circuit. | 02-16-2012 |
20120114083 | METHOD FOR GENERATING MODULATED RADIO-FREQUENCY SIGNAL WITH HIGH DYNAMIC RANGE - A method for generating a modulated RF signal with high dynamic range is disclosed, which electrically combines average output power adjustment and instantaneous output power adjustment to improve the dynamic range of output power of an RF signal. Compared to the single control mechanism in the traditional method for generating a modulated RF signal, the method for generating a modulated RF signal proposed by the present invention can be applied to produce a variety of highly efficient RF transmitters with high dynamic range. | 05-10-2012 |
20120128109 | NOISE ESTIMATION FORWIRELESS COMMUNICATION - Techniques for deriving and using noise estimate for data reception in a wireless communication system are described. A noise estimate may be derived for each packet received in a data transmission. Data detection may then be performed for each packet using the noise estimate for that packet. For noise estimation, a first sample sequence and a second sample sequence may be obtained from each receiver used for data reception. A phase offset between the first and second sample sequences may be determined and applied to the first sample sequence for each receiver to obtain a third sample sequence for that receiver. A noise estimate may then be derived based on the power of the differences between the second and third sample sequences for the at least one receiver. | 05-24-2012 |
20120155582 | INTERFERENCE SIGNAL REDUCTION METHOD AND RECEIVER - The invention relates to a method for reducing a signal (B) interfering with a broadband spread-spectrum signal (A) reaching a receiver ( | 06-21-2012 |
20120170695 | Methods And Apparatus For Automatic Gain Control Using Samples Taken At Desired Sampling Phase And Target Voltage Level - Methods and apparatus are provided for automatic gain control in a receiver using samples taken at a desired sampling phase and target voltage level. The gain of a received signal is adjusted by obtaining a plurality of samples of the received signal substantially at a desired sampling phase (such as a center of a given unit interval), wherein at least one of the samples is taken substantially at a target voltage level; comparing the plurality of samples to determine whether the received signal has an amplitude that is substantially equal to the target voltage level; and adjusting a receiver gain based on whether the received signal amplitude is substantially equal to the target voltage level. The comparison can comprise the evaluation of a logic function, such as an exclusive OR function. The comparison can be performed over a plurality of samples to obtain an average gain update decision. The receiver gain can be adjusted based on a histogram of the average gain update decision, relative to a predefined threshold. | 07-05-2012 |
20120177157 | ELECTRONIC DEVICE INCLUDING VOLTAGE CONTROLLED OSCILLATOR PULLING COMPENSATION CIRCUIT AND RELATED METHODS - An electronic device includes an input configured to receive at least one baseband input signal and at least one mixer downstream from the input. The electronic device also includes a phase-locked loop (PLL) including a voltage controlled oscillator (VCO) and a phase detector coupled thereto, the VCO coupled to the at least one mixer. A power amplifier is downstream from the at least one mixer and generates at least one aggressing signal that would otherwise generate an output pull of the VCO. The electronic device also includes a VCO pulling compensation circuit coupled to the input and the VCO and configured to compensate the VCO for the output pull based upon the at least one baseband input signal and the at least one aggressing signal. | 07-12-2012 |
20120183105 | Digital Automatic Gain Control Circuits and Methods For Controlling The Amplitude of a Time-Varying Signal - A gain control circuit, suitable for controlling the amplitude of a voltage-controlled oscillator, includes a duty cycle detector, an analog-to-digital converter, and a function generator. The gain control circuit provides a digitally enabled negative feedback loop. The duty cycle detector generates an estimate of the amplitude. The function generator receives a target amplitude as well as a digital representation of the estimate of the amplitude. The function generator calculates a modified estimate and periodically compares the same to the target value to generate a control word. The control word is arranged to enable current sources in the voltage-controlled oscillator. | 07-19-2012 |
20120257696 | GLITCH MITIGATION IN A RADIO RECEIVER - A basic idea is to determine (S | 10-11-2012 |
20120263262 | IQ Gain Imbalance Correction for Receivers Employing Sigma-Delta Analog to Digital Conversion - Embodiments of an apparatus for improving a gain imbalance between an in-phase and quadrature component recovered by a receiver are provided. The apparatus includes a first transition counter configured to count a number of bit transitions in a first sequence of one-bit values provided by a first sigma-delta modulator based on the in-phase component, and a second transition counter configured to count a number of bit transitions in a second sequence of one-bit values provided by a second sigma-delta modulator based on the quadrature component. The apparatus further includes a gain monitor configured to: (1) determine a first and second power level, proportional to a power of the in-phase and quadrature components respectively, using the number of bit transitions in the first and second sequences, and (2) adjust a gain of one of the in-phase and quadrature components based on a ratio between the first and second power levels. | 10-18-2012 |
20120288042 | METHOD USED FOR PROVIDING AN ADAPTIVE RECEIVING IN WIRELESS COMMUNICATION - The present invention relates to an adaptive, high cost-performance efficient, and power-saving receiving method used for wireless communication systems, such as but not limited to Bluetooth (BT) system, in particular to a method which can detect the presence or absence of the adjacent channel interference (ACI) before the scheduled starting time for receiving a Bluetooth packet, and accordingly set the receiver configurations including the filter's pass-band bandwidth (BW), filter's order, the sampling rate or the number of analog-to-digital-converter (ADC) output bits, and the automatic-gain-control (AGC) algorithm to determine the low noise amplifier (LNA) and variable gain amplifier (VGA) settings | 11-15-2012 |
20120288043 | ADAPTIVE WIRELESS COMMUNICATION RECEIVER - The present invention relates to an adaptive, cost-performance efficient, power-saving apparatus for wireless communication systems, such as but not limited to Bluetooth (BT) receivers, and in particular to a packet-based receiver's decoding algorithm which can detect the presence or absence of the adjacent channel interference (ACI) before the scheduled starting time for receiving a Bluetooth packet, and accordingly set the receiver configurations including the filter's pass-band bandwidth (BW), filter's order, the sampling rate, the number of analog-to-digital-converter (ADC) output bits, and the automatic-gain-control (AGC) algorithm unit to determine the low noise amplifier (LNA) and variable gain amplifier (VGA) settings. | 11-15-2012 |
20120294398 | ADAPTIVE RF SATURATION DETECTION IN A WIRELESS DEVICE IMPLEMENTING MULTIPLE WIRELESS PROTOCOLS - System and method for detecting radio frequency (RF) saturation in a wireless device configured to simultaneously receive first signals according to a first wireless protocol and second signals according to a second wireless protocol. Signals having components of both the first and second signals may be received at a shared gain element. A level of saturation of the shared gain element may be determined. A current definition of a saturation event may be determined. A gain adjustment value may be determined based on the level of saturation and the current definition of a saturation event. A gain value of the shared gain element may be adjusted by the determined gain adjustment value. | 11-22-2012 |
20120314821 | AUTOMATIC GAIN CONTROL DEVICE FOR SATELLITE POSITIONING RECEIVERS - Automatic gain control device for satellite positioning receivers characterized in that it comprises means for estimating the temporal occupancy rate of the pulses within the useful band, closed-loop control of the automatic gain control being applied in an optimal manner as a function of the said temporal occupancy rate, in such a manner as to reduce the influence of the pulsed interference within the band and out-of-band; notably, an AGC decision module ( | 12-13-2012 |
20130003902 | DIGITAL BROADCAST RECEIVER - When a decision is made that receiving performance deterioration due to an interfering wave is present in a digital broadcasting wave, an operating point of an RF AGC amplifier | 01-03-2013 |
20130022159 | METHOD AND APPARATUS FOR TRANSMITTING SIGNALS - A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit. | 01-24-2013 |
20130044842 | RADIO-FREQUENCY FRONT ENDS WITH AUTOMATIC GAIN CONTROL - A system for processing a wideband RF signal including at least an in-band signal and an out-of-band interference, comprising: an antenna; a low-noise amplifier (LNA), wherein gain of the LNA is variable and is controlled by a first gain-setting signal; a local oscillator for generating an oscillation signal at a first frequency that is spaced apart from the in-band signal carrier frequency by an intermediate frequency; a mixer for moving the in-band signal carrier frequency by the intermediate frequency and providing a variable conversion gain, which is controlled by a second gain-setting signal, to the in-band signal; a channel selection filter (CSF) for producing a desired-user signal; and an automatic gain control (AGC) unit for generating the first and second gain-setting signals derived from a desired LNA gain value, a desired mixer conversion gain value, strength of the in-band signal, and power of the out-of-band interference. | 02-21-2013 |
20130083875 | WIRELESS COMMUNICATION DEVICE HAVING REDUCED POWER CONSUMPTION - A wireless communication device is disclosed that is capable of reduced power consumption. The device includes several analog components, including some that may be capable of operating at multiple different operation powers and others whose function may be performed by an equivalent digital component. Based on a quality of a received signal, the wireless communication device can adjust a power consumption configuration of its analog components in order to optimize power use. For example, when signal quality is higher than necessary, the device can sacrifice performance to reduce operating power and/or switch to digital equivalent components. Similarly, when signal quality is lower than necessary, the device can enhance performance by increasing operating power and/or switching from digital equivalent components to corresponding analog components. | 04-04-2013 |
20130107995 | SYSTEM AND METHOD FOR SINGLE CHAIN SEARCH WITH A MULTIPLE CHAIN RECEIVER | 05-02-2013 |
20130142293 | SEMICONDUCTOR INTEGRATED CIRCUIT AND RECEIVER - The receiver includes a first arithmetic circuit that calculates a first mean value of the third signal in a preset first measurement setting period. The receiver includes a second arithmetic circuit that calculates a second mean value of the fourth signal in the first measurement setting period. The receiver includes a control circuit that controls the first arithmetic circuit and the second arithmetic circuit, changes the first set value according to the first mean value, and changes the second set value according to the second mean value. | 06-06-2013 |
20130142294 | WIRELESS DEVICE AND RECEIVING METHOD - The purpose of the present invention is to shorten a time required to perform Auto Gain Control (AGC) processing in a wireless device that can be applied to a plurality of wireless systems. On the basis of a first gain adjusted by means of a gain control unit ( | 06-06-2013 |
20130156140 | Receiver Chain Gain Selection - Apparatuses, methods and systems of selecting a gain setting of a receiver chain are disclosed. One method includes bypassing a filter portion of the receiver chain and sampling a bypass receive signal while the filter portion of the receiver chain is bypassed. If the sampled bypass receive signal is determined to be saturated greater than a threshold, then selecting a gain setting of the receive chain as a function of the saturation. Further, the filter portion of the receive chain is included while sampling a receive signal with the selected gain setting. | 06-20-2013 |
20130177112 | AUTOMATIC GAIN CONTROL IN A COMMUNICATIONS SYSTEM - An automatic gain control technique generates one or more gain control signals based on a known sequence of samples received in a preamble of a packet received over a particular communications link and generates one or more adjusted gain control signals based on a previously unknown sequence of samples received in a payload of a packet. In at least one embodiment of the gain control technique, time domain samples of the preamble of a symbol are used to generate the one or more gain control signals. In at least one embodiment of the gain control technique, frequency domain samples are used to generate the one or more adjusted gain control signals. The one or more gain control signals include digital and/or analog gain control signals that are provided to digital signal processing modules and/or analog circuits in an interface circuit, respectively, to adjust the gain applied to a received signal. | 07-11-2013 |
20130177113 | Correction of Imbalances in a Complex Intermediate Frequency Mixer - A complex intermediate frequency mixer (IFM) for frequency translating a received complex intermediate frequency, IF, signal, wherein the received complex IF signal comprises at least two frequency bands located at upper-side and lower-side of 0 Hz, is provided. The complex intermediate frequency mixer comprises a first, second, third and fourth mixer (M | 07-11-2013 |
20130182803 | ANALOG-DIGITAL CONVERTER AND RECEIVER - According to an embodiment, there are provided a capacitor DAC for generating an output signal in accordance with a connection state of a capacitor element, a reference voltage generation circuit for supplying a reference voltage to the capacitor DAC, a comparator for outputting a comparison result in accordance with the output signal, a successive approximation register for outputting a digital signal in accordance with the comparison result, and a control circuit for controlling a connection state of the capacitor element in accordance with the comparison result and comparing an ideal code with a digital signal obtained by sampling a predetermined voltage, thereby correcting an error of the digital signal. | 07-18-2013 |
20130195230 | FAST AUTOMATIC GAIN CONTROL - A device and method of fast automatic gain control in quadrature receivers are disclosed. The AGC activity between the I and Q branches is split where in one branch the receive chain is in a certain gain state and in the other branch the receive chain is in another possible gain state, resulting in a significant shortening of the AGC duration of any IQ receiver. | 08-01-2013 |
20130195231 | AUTOMATIC GAIN CONTROL - The present invention relates to receiver circuitry and methods for the reception of serial data and in particular to the setting of a gain within such circuitry so that the data may be successfully received. It provides a data receiver that comprises an amplifier connected to receive a data waveform and to amplify it, the amplifier having a controllable gain, a test sampler connected to sample the amplified data waveform to a 1 or 0 based on a reference level, to provide a set of test bits and a gain adjusting circuit responsive to the number of test bits that are one of 1 or 0 in the set of the test bits. | 08-01-2013 |
20130251077 | DATA RECEIVING CIRCUIT AND DATA RECEIVING METHOD - A data receiving circuit an a data receiving method accurately acquire a data signal corresponding to information data from a high speed high density transmitted signal. An increase or a decrease of the level of one of a amplified data signal and a level converted data signal that is transmitted from one, referred to as one processing stage, of an amplification processing stage and a level converting processing stage, is fed back to a stage preceding the one processing stage. The amplification processing stage supplies, to a first line, an amplified data signal obtained by performing an amplification processing on a received data signal, and the level converting processing stage transmits, via a second line, a level converted data signal obtained by performing a level converting processing on the amplified data signal. | 09-26-2013 |
20130251078 | RECEIVER GAIN ADJUSTMENT TO REDUCING AN INFLUENCE OF A DC OFFSET - The invention refers to generating a digital signal from an analog signal, wherein the analog signal is amplified according to a gain control value before being converted to a digital value by means of an analog-to-digital converter, wherein a DC offset value of the analog signal is determined, and the gain control value is generated as a function of the dynamic range of the analog-to-digital converter and the DC offset value. The invention further refers to a corresponding circuit and a computer program. | 09-26-2013 |
20130259172 | Receiver with Variable Gain Control Transimpedance Amplifier - According to one embodiment, a compact low-power receiver comprises first and second analog circuits connected by a digitally controlled interface circuit. The first analog circuit has a first direct-current (DC) offset and a first common mode voltage at an output, and the second analog circuit has a second DC offset and a second common mode voltage at an input. The digitally controlled interface circuit connects the output to the input, and is configured to match the first and second DC offsets and to match the first and second common mode voltages. In one embodiment, the first analog circuit is a variable gain control transimpedance amplifier (TIA) implemented using a current mode buffer, the second analog circuit is a second-order adjustable low-pass filter, whereby a three-pole adjustable low-pass filter in the compact low-power receiver is effectively produced. | 10-03-2013 |
20130279635 | Automatic Gain Control (AGC) For Multichannel/Wideband Communications System - Automatic Gain Control (AGC) system for multi-channel signals attenuates an incoming multi-channel signal by providing a gain. The system further adjusts each individual channel, of the multi-channel signal, by supplying a second gain if needed. The AGC system is designed to ensure a received signal power is at an optimal level for analog to digital conversion or any other form of signal processing. The system also enables elimination of mid-packet gain adjustments. | 10-24-2013 |
20130279636 | INTEGRATED RECEIVERS AND INTEGRATED CIRCUIT HAVING INTEGRATED INDUCTORS - A receiver includes an input section, a plurality of RF sections, an output circuit, and a controller. The input section receives and amplifies a radio frequency (RF) input signal to provide an amplified RF signal, and has a gain input. The plurality of RF sections each have an input for receiving the amplified RF signal, and an output for providing an intermediate frequency signal. The output circuit provides an intermediate frequency output signal in response to an output of at least one of the plurality of RF sections. The controller has an output coupled to the gain input of the input section. | 10-24-2013 |
20130301763 | POWER ADJUSTING METHOD AND APPARATUS - A power adjusting method and apparatus provided by embodiments of the present invention relate to the field of communications. The power adjusting method of this embodiment includes: receiving a signal from a sending end, where the signal includes a cyclic prefix (CP) signal; detecting and acquiring first receiving power and second receiving power of the CP signal, where the first receiving power is average power of N sampling points of the CP signal, and the second receiving power is average power of M sampling points of the CP signal; after determining that a ratio of the first receiving power to target power is greater than a first preset threshold, adjusting signal power magnification; and after determining that the ratio of the second receiving power to the target power is greater than a second preset threshold, adjusting the signal power magnification again. | 11-14-2013 |
20130301764 | AUTOMATIC GAIN CONTROL TECHNIQUES FOR DETECTING RF SATURATION - Functionality can be implemented for automatic gain control (AGC) in a wireless network device to determine whether to change the gain of the wireless network device based on determining the strength of an RF signal. At various time instants, the strength of the RF signal can be compared against different thresholds to determine the presence of and severity of the saturation of the RF front end. The gain settings can be adjusted based on comparing the strength of the RF signal with a set of thresholds. This can help the wireless network device receive RF signals with little or no distortion, and can minimize RF saturation, gain compression, false detection and other performance degradation at the wireless network device. | 11-14-2013 |
20130308731 | WIRELESS LAN COMMUNICATION DEVICE, RELEVANT SIGNAL PROCESSING CIRCUIT, AND METHOD THEREOF - A wireless LAN communication device includes an amplifying circuit, an interference detection circuit, a false alarm counting circuit, and a control circuit. The amplifying circuit is configured to operably provide a gain to wireless signals. The interference detection circuit is configured to operably detect adjacent channel interference signals to generate a detection result. The false alarm counting circuit is configured to operably calculate a number of false alarms incurred by the adjacent channel interference signals. The control circuit is configured to operably configure the gain of the amplifying circuit according to the detection result and the number of false alarms. | 11-21-2013 |
20130329839 | RECEIVING DEVICE, RECEIVING METHOD, AND PROGRAM - The present technique relates to a receiving device, a receiving method, and a program that are designed to improve reception performance. A receiving device according to one aspect of the present technique includes: a gain control unit that adjusts the power of a signal including a first pilot signal transmitted as signals having a high correlation in terms of polar direction via different transmission channels, and a second pilot signal transmitted as signals having a low correlation in terms of polar direction via the different transmission channels; and a control unit that controls the followability of the gain at the gain control unit in accordance with a data transmission method. The present technique can be applied to a receiver that receives data transmitted by MISO (Multi Input, Single Output) compliant with the DVB-T2 standards. | 12-12-2013 |
20140029705 | ENHANCED PILOT SIGNAL RECEIVER - Briefly, in accordance with one embodiment, a method of adjusting for digital automatic gain control (DAGC) quantization error in a mobile station is as follows. A first DAGC value is stored before reception of one or more enhanced pilot signals. A second DAGC value is computed during reception of the one or more enhanced pilot signal. The first DAGC value is restored after reception of the one or more enhanced pilot signals is over. An advantage associated with this particular embodiment may include reduction in quantization error for digital automatic gain control. | 01-30-2014 |
20140037030 | GAIN PARTITIONING IN A RECEIVER - An automatic gain control loop disposed in a receiver is adapted to compensate for varying levels of out of band interference sources by adaptively controlling the gain distribution throughout the receive signal path. One or more intermediate received signal strength indicator (RSSI) detectors are used to determine a corresponding intermediate signal level. The output of each RSSI detector is coupled to an associated comparator that compares the intermediate RSSI value against a corresponding threshold. The take over point (TOP) for gain stages is adjusted based in part on the comparator output values. The TOP for each of a plurality of gain stages may be adjusted in discrete steps or continuously. | 02-06-2014 |
20140037031 | METHODS FOR DIGITALLY-CONTROLLED AUTOMATIC GAIN AMPLIFICATION - Apparatus and methods are disclosed, such as those involving a receiver device. One such apparatus includes an equalizer configured to process an input signal transmitted over a channel. The equalizer can include a programmable gain amplifier (PGA) block which includes an input node configured to receive the input signal; an output node; and a programmable gain amplifier (PGA). The PGA amplifies the input signal with an adjustable gain. The PGA block also includes a gain control block having an input electrically coupled to the input node. The gain control block is configured to adjust the gain of the PGA at least partly in response to the input signal from the input node such that the PGA generates an output signal with a substantially constant amplitude envelope to the output node. | 02-06-2014 |
20140056395 | TECHNIQUE FOR AUTOMATIC GAIN CONTROL - A method of performing Automatic Gain Control, AGC, in a receiver of a device is provided. The device is served on a serving carrier of a multi-carrier communication network. Measurement gaps are scheduled on the serving carrier for inter-carrier measurements on a non-serving carrier. The method comprises the step of determining a first time interval, in which a predefined signal portion is transmitted on the non-serving carrier; the step of estimating, for the first time interval, received signal power on the non-serving carrier; the step of computing a receiver gain based on the estimate signal power; the step of performing, over a second time interval, an inter-carrier measurement on the non-serving carrier; and the step of applying the receiver gain to the receiver after the second time interval. | 02-27-2014 |
20140079165 | SYSTEM AND METHOD FOR DISCRETE GAIN CONTROL IN HYBRID MIMO RF BEAMFORMING FOR MULTI LAYER MIMO BASE STATION - A multiple-input-multiple-output (MIMO) receiving system configured for receiving multiple transmission layers is provided herein. The system includes a plurality of beamformed tunable receiving antennas configured to receive a plurality of transmitted layers; and a control module configured to select for the beamformed antennas a single set of discrete weights for tuning said antennas for all of the transmitted layers so that the weights are selected for optimal performance of said receiving system, wherein said selection is carried out based on an extended Maximal Ratio Combining (MRC) metric or other quality metric measured by the MIMO baseband module, and using said measured metric separately for each beamformed antenna to determine gain or attenuation independently of phase selection. | 03-20-2014 |
20140086370 | CIRCUITS, SYSTEMS, AND METHODS FOR MANAGING AUTOMATIC GAIN CONTROL IN QUADRATURE SIGNAL PATHS OF A RECEIVER - A system provides closed-loop gain control in a WCDMA mode and open loop control in an EDGE/GSM mode. Gain control is distributed across analog devices and a digital scaler in a wireless receiver. In the WCDMA mode, a loop filter generates an error signal that is forwarded to analog and digital control paths. The analog control path includes a first adder, a programmable hysteresis element, and a lookup table. The analog control signal is responsive to thresholds, which when used in conjunction with a previous gain value determine a new gain value. The digital control path includes a second adder, a programmable delay element, and a converter. A control word is responsive to a difference of the error signal, a calibration value, and the analog control signal. Blocker detection is provided in the WCDMA mode of operation. A controller sets system parameters using a state machine. | 03-27-2014 |
20140098912 | HIGH-THROUGHPUT BEAMFORMING MIMO RECEIVER FOR MILLIMETER WAVE COMMUNICATION AND METHOD - A receiver in a communication system is provided that includes a synchronization module and a channel estimator. The synchronization module is configured to identify an end of a cyclic prefix (CP) in a received signal using slope detection by monitoring a detection metric threshold in the received signal. The channel estimator is configured to estimate a complex noise variance using guard band subcarriers. | 04-10-2014 |
20140105336 | REDUCED POWER-CONSUMPTION RECEIVERS - An exemplary embodiment disclosed comprises a mixer having a plurality of input leads; a first degenerative impedance element coupled to a first input lead of the mixer; a second degenerative impedance element coupled to a second input lead of the mixer; and a local oscillator (LO) system comprising a plurality of duty cycle modes to generate a LO signal for the mixer, the local oscillator system operates in a first duty cycle based on a first gain state of the mixer, and in a second duty cycle based on a second gain state of the mixer. | 04-17-2014 |
20140112421 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - Disclosed is a communication apparatus including an amplification part and a transient characteristics control part. The amplification part is configured to amplify a signal level of a received signal. The transient characteristics control part is configured to control transient characteristics of the amplification part. | 04-24-2014 |
20140146926 | RECEPTION CIRCUIT AND RECEIVER - VGAs amplify a baseband reception signal using a prescribed gain. HPFs stop part, in a band lower than a first cutoff frequency, of the amplified reception signal. An ADC AD-converts an output signal of the HPFs and thereby outputs a digital reception signal. An AGC controller outputs a gain code corresponding to a prescribed gain of the VGAs. A VGA gain corrector adjusts the gain of the VGAs by a prescribed amount. | 05-29-2014 |
20140169510 | RECEIVER ARCHITECTURE WITH RECONFIGURABLE ON-CHIP MATCHING FOR WIDEBAND OPERATION AND OFF-CHIP MATCHING FOR LOW-POWER OPERATION - A circuit for a receiver with reconfigurable low-power or wideband operation may comprise one or more main signal paths each coupled to a first port and including a low-noise amplifier (LNA) configured to provide a radio frequency (RF) signal to a main mixer circuit. An auxiliary signal path may be coupled to a second port. The auxiliary signal path may include an auxiliary mixer configured to provide an on-chip matching input impedance that may match an impedance of the antenna. The first port may be coupled to an RF antenna through an off-chip matching circuit, when a low-power operation is desired. The first port may be coupled to the second port and to the RF antenna, when a wideband operation is desired. | 06-19-2014 |
20140185718 | METHOD AND APPARATUS FOR EXTRACTING THE QUADRATURE COMPONENT OF A COMPLEX SIGNAL FROM THE IN-PHASE COMPONENT AFTER BASEBAND DIGITIZING USING A COMPLEX TRANSFORM - A method and apparatus for a receiver system in a receiver that includes at least two front end branches, each branch having its own intermediate frequency (IF) mixer to shift a received signal to an IF. When receiving multiple independent signals, the signals are digitized and the receiver performs a digital complex transform on each signal to obtain the corresponding quadrature component. When receiving a single signal the signal is routed to two mixers that are 90 degrees out of phase to obtain the quadrature signal components in the analog section of the receiver. | 07-03-2014 |
20140185719 | SYSTEM AND METHOD FOR DISCRETE GAIN CONTROL IN HYBRID MIMO/RF BEAMFORMING - A system for selectively and discretely amplifying or attenuating antennas in a hybrid multiple-input-multiple-output (MIMO) radio distribution network (RDN) receiving system is provided herein. The system includes a MIMO receiving system comprising a MIMO baseband module having N branches; an RDN connected to the MIMO receiving system, the RDN comprising at least one beamformer fed by two or more antennas, so that a total number of antennas in the system is M, wherein M is greater than N, wherein each one of the beamformers include a passive combiner configured to combine signals coming from the antennas coupled to a respective beamformer into a combined signal, wherein the at least one beamformer is further configured to selectively amplify or attenuate in discrete steps, one or more of the signals coming from the M antennas, based on qualitative metrics measured by the MIMO baseband module. | 07-03-2014 |
20140211891 | METHOD AND APPARATUS FOR CONTROLLING GAIN IN COMMUNICATON SYSTEM SUPPORTING BEAM FORMING SCHEME - A signal reception apparatus in a communication system supporting a beam forming scheme is provided. The signal reception apparatus includes a Low Noise Amplifier (LNA) configured to generate a second signal by amplifying a first signal according to a first gain value, a Variable Gain Amplifier (VGA) configured to generate a third signal by amplifying the second signal according to a second gain value, and an Automatic Gain Controller (AGC) configured to control the first gain value and the second gain value by considering a plurality of beam types supported in a signal transmission apparatus. | 07-31-2014 |
20140301508 | AUTOMATIC GAIN CONTROL IN A RECEIVER - Automatic gain control in a receiver. A method for controlling operating range of an analog-to-digital converter (ADC) by an automatic gain control circuit includes estimating a peak-to-average ratio corresponding to an analog signal from digital samples of the analog signal. The method includes determining a peak value corresponding to the analog signal based on the peak-to-average ratio. Further, the method includes maintaining magnitude of the analog signal at an input of the ADC and gain of the receiver based on the peak value. | 10-09-2014 |
20140348274 | RECEIVER FRONT END FOR CARRIER AGGREGATION - Techniques for providing a receiver front end supporting carrier aggregation with gain alignment and improved matching across modes. In an aspect, auxiliary circuitry is configurable to selectively enable or disable mutual coupling between a source degeneration inductor of an LNA input transistor and an auxiliary inductor. A negative turns ratio coupling is provided between the inductors, such that the effective inductance of the source degeneration inductor is lowered when mutually coupled to the auxiliary inductor. In a non-carrier aggregation (non-CA) mode, the auxiliary inductor is disabled, while in a carrier aggregation (CA) mode, the auxiliary inductor is enabled. In this manner, using a single transistor, gain alignment across non-CA and CA modes is achieved. Furthermore, matching is preserved across non-CA and CA modes using a single external matching component. | 11-27-2014 |
20140369449 | INTERFERENCE MITIGATION FOR DEVICES WITH MULTIPLE RECEIVERS - Methods and systems for mitigating interference or estimating a covariance matrix in a communication system are disclosed. In some embodiments, a method of demodulating a received signal in a communication system includes receiving a first plurality of waveforms, estimating a covariance matrix based on the first plurality of waveforms, determining a spatial filter based on the estimated covariance matrix, receiving a second plurality of waveforms, generating at least one filtered waveform by applying the spatial filter to the second plurality of waveforms, and demodulating the at least one filtered waveform. | 12-18-2014 |
20150010119 | NOISE-BASED GAIN ADJUSTMENT AND AMPLITUDE ESTIMATION SYSTEM - Methods and systems for amplitude estimation and gain adjustment using noise as a reference are described. An example receiver can include an antenna and a front end amplifier coupled to the antenna. The receiver can also include a detector circuit coupled to the front end amplifier. The receiver can be configured to determine a power of a received signal at the antenna based on a gain of the receiver. The gain of the receiver can be determined based on a noise figure of the front end amplifier and a noise amplitude. | 01-08-2015 |
20150063504 | Digital Receiver System Activated by RSSI Signal - A digital receiver includes a radio frequency analog front end, a digital processing unit, a plurality of cascaded amplifier stages configured to receive output of the radio frequency analog front end, a first analog to digital converter configured to convert an analog signal output from the plurality of cascaded amplifier stages into a digital signal output to the digital processing unit, a first received signal strength indicator unit configured to receive outputs of each of the plurality of cascaded amplifier stages and output signal to the digital processing unit, a second received signal strength indicator unit configured to receive output of at least one amplifier stage in the plurality of cascaded amplifier stages, and a received signal strength indicator detection unit configured to activate and to deactivate digital units according to a comparison of output from the second received signal strength indicator unit to a predetermined threshold. | 03-05-2015 |
20150063505 | APPARATUS AND METHOD FOR COMPENSATING FOR CHANNEL LOSS IN AN ELECTRONIC DEVICE - An apparatus for compensating for channel loss in an electronic includes a resistor configured to increase an output voltage swing level, and a connector configured to receive a data signal, to compensate for channel loss of the received data signal by amplifying the received data signal, and to output the amplified data signal. | 03-05-2015 |
20150295749 | BLIND I/Q MISMATCH COMPENSATION APPARATUS AND METHODS - Apparatus and methods disclosed herein perform gain, clipping, and phase compensation in the presence of I/Q mismatch in quadrature RF receivers. Gain and phase mismatch are exacerbated by differences in clipping between I & Q signals in low resolution ADCs. Signals in the stronger channel arm are clipped differentially more than weaker signals in the other channel arm. Embodiments herein perform clipping operations during iterations of gain mismatch calculations in order to balance clipping between the I and Q channel arms. Gain compensation coefficients are iteratively converged, clipping levels are established, and data flowing through the network is gain and clipping compensated. A compensation phase angle and phase compensation coefficients are then determined from gain and clipping compensated sample data. The resulting phase compensation coefficients are applied to the gain and clipping corrected receiver data to yield a gain, clipping, and phase compensated data stream. | 10-15-2015 |
20150304155 | ZigBee Receiver Exploiting an RF-to-BB Current-Reuse Blixer and Hybrid Filter Topology - A unified balun low noise amplifier (LNA) and I/Q mixer is provided as a single-chip design, and includes a passive/active gain-boosted balun-LNA-I/Q-mixer (blixer), a filter section and a buffer amplifier. The filter section includes an IF-noise-shaping transistorized current-mode lowpass filter sharing a common power supply with the blixer, which allows the blixer and lowpass filter to draw a single bias current. The filter section also includes a complex-pole load providing image rejection and channel selection. | 10-22-2015 |
20150311878 | RECEIVING APPARATUS THAT RECEIVES PACKET SIGNAL - An RF unit receives predetermined signals. The RF unit amplifies the received signals. A gain control unit controls the gain at the RF unit based on the amplified signal and has the RF unit use the controlled gain. The gain control unit performs different controls on the received signals, depending on the case when the received signal is a known signal placed in the beginning of packet signal and the case when the received signal is a signal other than the packet signal. | 10-29-2015 |
20150326185 | RECEIVER WITH VARIABLE GAIN CONTROL TRANSIMPEDANCE AMPLIFIER - According to one embodiment, a compact low-power receiver comprises first and second analog circuits connected by a digitally controlled interface circuit. The first analog circuit has a first direct-current (DC) offset and a first common mode voltage at an output, and the second analog circuit has a second DC offset and a second common mode voltage at an input. The digitally controlled interface circuit connects the output to the input, and is configured to match the first and second DC offsets and to match the first and second common mode voltages. In one embodiment, the first analog circuit is a variable gain control transimpedance amplifier (TIA) implemented using a current mode buffer, the second analog circuit is a second-order adjustable low-pass filter, whereby a three-pole adjustable low-pass filter in the compact low-power receiver is effectively produced. | 11-12-2015 |
20150349822 | METHOD, SYSTEM AND APPARATUS FOR AUTOMATIC GAIN CONTROL IN DIRECT-CONVERSION RECEIVER - A wireless receiver automatic gain control system includes: a coarse amplification subsystem that receives and amplifies a carrier-modulated signal; a demodulator that generates a baseband signal from the amplified carrier-modulated signal; a fine amplification subsystem that amplifies the baseband signal; and a controller connected to the amplification subsystems. The controller: obtains a unified gain value for the amplification subsystems; based on the unified gain value, selects (i) one of a plurality of coarse gain values defining a set of coarse gain steps each spanning a plurality of unified gain steps, and (ii) one of a plurality of fine gain values defining a set of fine gain steps each spanning a single unified gain step; and sets (i) the gain of the coarse amplification subsystem to the selected coarse gain value, and (ii) the gain of the fine amplification subsystem to the selected fine gain value. | 12-03-2015 |
20150349823 | WIRELESS NETWORK RECEIVER - A wireless network receiver includes a detection module that uses preamble data in a data frame for signal processing functions and the detection module is configured to adjust the number of preamble data bits that are used based on the power of a received signal. | 12-03-2015 |
20150358187 | SIGNAL PROCESSING SYSTEM AND SIGNAL PROCESSING METHOD COOPERATING WITH VARIABLE GAIN AMPLIFIER - A signal processing system includes a variable gain amplifier, an analog-to-digital converter (ADC), a gain compensation module and a signal processing module. The variable gain amplifier applies a variable gain to an analog input signal to generate an amplified analog signal. The ADC converts the amplified analog signal to an amplified digital signal. The gain compensation module applies a compensation gain to the amplified digital signal to generate a compensated signal. The compensated signal has an instantaneous change lower than a predetermined threshold. The signal processing module performs a signal processing procedure on the compensated signal. | 12-10-2015 |
20160020742 | METHOD FOR DIGITALLY COMPENSATING VARIATIONS, AS A FUNCTION OF TEMPERATURE, OF AN ELECTRICAL QUANTITY OF AN EMBEDDED SPACE RADIOFREQUENCY TELECOMMUNICATIONS EQUIPMENT ITEM - A digital compensation method includes measuring the temperature of the equipment item and applying an analogue control voltage intended to maintain the electrical quantity of the equipment item at a predetermined setpoint value. At each measurement instant, the method includes interrogating look-up tables respectively associated with different setpoint values, then, when the measured temperature is situated between two digital temperature states stored in the look-up tables, creating intermediate digital temperature states situated between the two stored digital temperature states, computing, by interpolation, digital control words corresponding to the intermediate digital temperature states created, and selecting a digital control word, stored or intermediate, corresponding to the measured temperature, then delivering, to at least one of the N individual devices, the analogue control corresponding to the selected digital control word. | 01-21-2016 |
20160020931 | METHOD AND APPARATUS FOR DIGITIZATION OF BROADBAND ANALOG SIGNALS - Methods and systems for digitization of broadband analog signals may comprise in a radio frequency (RF) transceiver comprising a diplexer, first and second automatic gain and slope control (ASCS) modules, a combiner, and an analog to digital converter (ADC): receiving an input RF signal comprising at least two signals, splitting the input RF signal in the frequency domain into first and second signals of different frequency utilizing the diplexer, configuring a frequency-dependent gain level for each of the first and second signals utilizing the first and second ASCS modules, combining output signals from the first and second ASCS modules utilizing the combiner, and converting the combined output signals to a digital signal utilizing the ADC. The frequency dependent gain levels of the first and second signals may be configured to enable the ADC to operate with an effective number of bits (ENOB) of approximately 10. | 01-21-2016 |
20160043697 | FRONT-END MATCHING AMPLIFIER - A front-end receiver includes an amplifier that has a steady gain over a wide frequency range. The disclosed amplifier adopts an architecture in which a common-source (CS) circuit stacks against a common-gate (CG) circuit. The CG circuit provides the input impedance matching while the CS circuit boosts the amplification gain. As a result, the disclosed amplifier allows the front-end receiver to break free from a tradeoff between input impedance matching and gain boosting. Moreover, the disclosed amplifier achieves power saving and noise reduction by having the CS circuit to share the same bias current with the CG circuit. | 02-11-2016 |
20160094257 | ARRAYED ANTENNA FOR COHERENT DETECTION OF MILLIMETERWAVE AND TERAHERTZ RADIATION - We disclose an arrayed antenna for reception of electromagnetic radiation from a millimeter-wave or terahertz range. In an example embodiment, individual antenna cells in the arrayed antenna are configured for coherent detection of the received electromagnetic radiation and are electrically connected with one another in a manner that causes each of the antenna cells to positively contribute to the overall gain of the arrayed antenna. In some embodiments, the arrayed antenna may have a network of electrical conductors that is configured to (i) collect and deliver the electrical output signals generated by the individual antenna cells to an output terminal of the arrayed antenna, (ii) deliver an electrical local-oscillator signal from a common local-oscillator source to the individual antenna cells, and (iii) deliver electrical DC power from a common power supply to electrical circuits in the individual antenna cells. | 03-31-2016 |
20160100455 | MULTI-CARRIER BASE STATION RECEIVER - Embodiments of the present invention may provide a receiver. The receiver may include an RF section, a local oscillation signal generator to generate quadrature local oscillation signals, and a quadrature mixture, coupled to the RF section, to downconvert a first group of wireless signals directly to baseband frequency quadrature signals and to downconvert a second group of wireless signals to intermediate frequency quadrature signals. The receiver may also include a pair of analog-to-digital converters (ADCs) to convert the downconverted quadrature signals to corresponding digital quadrature signals. Further, the receiver may include a digital section having two paths to perform signal processing on the digital baseband frequency quadrature signals and to downconvert the digital intermediate frequency signals to baseband cancelling a third order harmonic distortion therein. Moreover, the receiver may include a phase corrector to adjust a phase of one of the local oscillation signals to balance the third order harmonic distortion and a gain offset generator to adjust a gain of one of the downconverted signals to balance the third order harmonic distortion. | 04-07-2016 |
20160119886 | METHOD AND DEVICE FOR PERFORMING AUTOMATIC GAIN CONTROL - The present invention relates to a method and device for performing automatic gain control. The method comprises predicting an AGC setting to be used based on statistical data with respect to a plurality of previously stored AGC settings. The method also comprises receiving an interference signal during an idle time period using the predicted AGC setting. The method further comprises detecting received power of the interference signal. The method additionally comprises adjusting the predicted AGC setting based on a result of the detecting. With the method and device of the present invention, an initial AGC setting with high accuracy and usability can be obtained and the glitch effect can be overcome. | 04-28-2016 |
20160126912 | Attenuator Control for a Signal Processing Chain - An attenuator control method of a signal processing chain comprising two or more signal processing units is disclosed. One of the two or more signal processing units is a signal attenuator adapted to apply adaptive signal attenuation of an attenuator input signal based on one or more attenuation parameters to provide an attenuator output signal. At least one of the two or more signal processing units has an associated wearout process and a corresponding wearout budget, wherein a wearout event of the wearout process occurs when a level of a wearout indication signal of the signal processing chain is in a wearout region, and wherein the wearout process is modeled by a wearout event cost associated with a corresponding wearout event. The method comprises obtaining an indication of whether a wearout event of the wearout process has occurred. If the obtained indication shows that a wearout event of the wearout process has occurred, the method comprises updating a wearout accumulation metric of the wearout process by the associated wearout event cost, comparing the wearout accumulation metric of the wearout process with one or more wearout thresholds of the wearout process, and adapting the attenuation parameters of the signal attenuator based on the comparison. The method also comprises controlling the signal attenuator based on the attenuation parameters. Corresponding attenuator control arrangement is also disclosed. | 05-05-2016 |
20160126913 | NOISE-BASED GAIN ADJUSTMENT AND AMPLITUDE ESTIMATION SYSTEM - Methods and systems for amplitude estimation and gain adjustment using noise as a reference are described. An example receiver can include an antenna and a front raid amplifier coupled to the antenna. The receiver can also include a detector circuit coupled to the front end amplifier. The receiver can be configured to determine a power of a received signal at the antenna based on a gain of the receiver. The gain of the receiver can be determined based on a noise figure of the front end amplifier and a noise amplitude. | 05-05-2016 |
20160149738 | Automatic Gain Control (AGC) for Multichannel/Wideband Communications System - Automatic Gain Control (AGC) system for multi-channel signals attenuates an incoming multi-channel signal by providing a gain. The system further adjusts each individual channel, of the multi-channel signal, by supplying a second gain if needed. The AGC system is designed to ensure a received signal power is at an optimal level for analog to digital conversion or any other form of signal processing. The system also enables elimination of mid-packet gain adjustments. | 05-26-2016 |
20160150489 | Radio Frequency Receiver and Automatic Gain Control Method of Radio Frequency Receiver - A radio frequency receiver and an automatic gain control method of the radio frequency receiver is presented. The radio frequency receiver includes an automatic gain control apparatus, a radio frequency component, and an analog to digital converter, where the automatic gain control apparatus further includes: an intensity calculator configured to calculate a relationship between an intensity representation parameter of digital data and a preset intensity threshold within a preset calculation time; and an automatic gain controller configured to compare the relationship calculated by the intensity calculator with a preset relationship threshold, and adjust a gain of the radio frequency component on radio frequency data according to a comparison result, so that an amplitude of the radio frequency data obtained after the gain adjustment is within a receiving range of the analog to digital converter. | 05-26-2016 |
20160173048 | DC OFFSET CALIBRATION OF WIRELESS RECEIVERS | 06-16-2016 |
20160191088 | RECEIVER WITH IMPROVED NOISE VARIANCE ESTIMATION - A system according to one embodiment includes an automatic gain control circuit configured to provide an amplifier gain value; a temperature sensing circuit configured to provide a temperature; an antenna switching circuit configured to decouple an antenna from the receiver during a noise figure calibration interval; a signal power measurement circuit configured to measure input power to the receiver; a noise figure estimation circuit configured to estimate a receiver noise figure during the noise figure calibration interval based on an receiver noise variance, the temperature and the amplifier gain value, wherein the initial receiver noise variance is estimated based on the measured input power during e noise figure calibration interval; and a noise variance tracking circuit configured to calculate updated estimates of the receiver noise variance, wherein the updated estimates are based on updates of the measured temperature and updates of the measured amplifier gain. | 06-30-2016 |