| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 375329000 | Phase shift keying | 88 |
| 20080285686 | Antenna Selection Apparatus and Methods - An apparatus and method for antenna selection diversity are provided. Antennas are selected by summing moments of space-time block encoded signals received via each respective antenna and selecting at least one antenna with the largest moment sum. | 11-20-2008 |
| 20080304598 | SYSTEM AND METHOD FOR M-ARY PHASE-SHIFTING KEYING MODULATION - System and method for m-ary phase shifting keying modulation. According to an embodiment, the present invention provides a method for performing m-ary phase-keying shift modulation. The method includes providing at least a first signal and a second signal by a signal source. The first signal and the second signal are characterized by a first signal strength level. The method also includes attenuating the second signal to provide a third signal. The second signal are characterized by a second signal strength level which is at approximate 50% of the first signal strength level. The method additionally includes coupling the first signal to a first bias voltage to provide a fourth signal. Furthermore, the method includes coupling the third signal to a second bias voltage to provide a fifth signal. The method also includes a step for providing a sixth signal by combing the fourth signal and the fifth signal. | 12-11-2008 |
| 20080310552 | Ramping in Multimode Transmitters Using Primed Filters - A modulation system can switch between two modulation modes. In order to comply with limits on peak power in spectral bands outside the RF operating one the transmitter is required to ramp down to a condition of minimal power. To avoid fixed ramping and trailing bits, the transmitting signal is subjected to FIR filtering. The two FIR filters are primed with a sequence using a parallel input mode before serially entering the information data. | 12-18-2008 |
| 20090067549 | Optimal Two-Layer Coherent Demodulation for DPSK (Differential Phase Shift Keying) - A D-PSK demodulator utilizes a two-layer coherent approach to estimate the phase shift of adjacent symbols. There is generated a probability set of each received symbol being one of possible constellation values. There is also generated a probability set of each of possible phase difference between two adjacent symbols. This probability set is then converted into soft bit information according to specific mathematical operation. | 03-12-2009 |
| 20090097592 | Hierarchical offset compensation to improve synchronization and performance - Systems and methods for removing phase shifts due to hierarchical modulation to improve synchronization and performance in legacy and hierarchical decoders are presented. In exemplary embodiments of the present invention, methods of compensating for the effects of hierarchical modulation can, for example, comprise receiving an I,Q symbol that has been further modulated by an overlay phase shift, detecting the direction of the overlay phase shift, de-rotating the symbol by a defined angle corresponding to the overlay phase shift and said direction; and passing the symbol to legacy synchronization and forward error correction decoding stages after said de-rotating. An exemplary receiver can be provided to implement the disclosed methods. Exemplary embodiments of the present invention provide the simplest solution to compensating for overlay modulation without requiring modification of any proven algorithms within legacy demodulator designs. The methods of exemplary embodiments of the present invention allow for essentially any offset angle used in an overlay modulation scheme to have minimal effect on signal acquisition and performance. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims. | 04-16-2009 |
| 20090103656 | CORRELATION DEVICE AND METHOD FOR DIFFERENT MODULATED SIGNALS - A correlation device and method for different modulated signals such as BPSK signal and BOC signal. According to the present invention, the correlation device has one or more sections. Each section comprises a correlation unit for executing correlation; a first signal path for passing a received signal directly to the correlation unit; a second signal path for transferring a BOC signal into a BPSK-like signal and passing the signal to the correlation unit. The correlation unit has a multiplexer for selecting to allow an output of one of the first and second signal paths to be subject to signal correlation. The correlation results of the respective sections can be combined. | 04-23-2009 |
| 20090141832 | Method for estimating frequency offset at a subscriber station receiver in a multi-carrier system - A method and system of estimating frequency offset of a subscriber station is disclosed. The method includes the subscriber station receiving a composite signal, wherein the composite signal includes multi-carrier signals transmitted from a plurality of base stations. The subscriber station selects a subset of the plurality of base stations. The subscriber station selects at least one pair of multi-carrier symbols of the composite signal, wherein each of the at least one pair of multi-carrier symbols includes a plurality of pilot sub-carriers. The subscriber station selects at least one group of the plurality of pilot sub-carriers within the at least one pair of multi-carrier symbols based on transmit pilot symbols of the pilot sub-carriers of the multi-carrier signals transmitted by the subset of the plurality of base stations. The frequency offset is estimated based on a conjugate product between a linear combination of received symbols of a first multi-carrier symbol of a pair of multi-carrier symbols with a linear combination of received symbols of a second multi-carrier symbol of the pair of multi-carrier symbols on each of the pilot sub-carriers of the at least one group of the plurality of pilot sub-carriers. | 06-04-2009 |
| 20090207944 | COMMUNICATIONS DEVICE AND RELATED METHOD THAT DETECTS SYMBOL TIMING - A communications device includes a signal input for receiving signals such as a binary phase shift keyed (BPSK) communications signal having a repeated preamble bit or symbol pattern. A modem processes the communications signal and includes a demodulator and processor that generates an initial frequency offset estimate and phase error estimate by processing such as with a Fast Fourier Transform (FFT), that detects the repeated preamble pattern for a block of samples within the communications signal, correlates two halves of the block of samples with a plurality of different shifted sequences and determines a maximum correlation value for the shifted sequence that provides the maximum correlation value to establish a symbol timing estimate based on the known timing alignment of this shifted sequence. Radio circuitry is operative with the modem for processing communications data obtained from the communications signal. | 08-20-2009 |
| 20090220030 | SYSTEM AND METHOD FOR MODULATING A SIGNAL AT AN ANTENNA - A Direct Spatial Antenna Modulation (DSAM) antenna structure makes use of the instantaneous electromagnetic field state of a radiating antenna structure to achieve direct modulation of a transmitted signal within the antenna. In contrast to existing amplitude and phase-only based digital modulation techniques, this innovative technique utilizes an inherent spatial modulation component, mapping data spatially to different locations in the antenna structure, where each location has different transmitting and receiving properties. This spatial component of the modulation can enable, for example, a unique increase in data transmission speed in a fixed spectral bandwidth with no increase in bit error rate over current phase and amplitude only modulation techniques. Additionally, the DSAM antenna structure affords important benefits in reduced hardware complexity, reduced supply current consumption, and relaxed amplifier linearity requirements. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this Abstract. | 09-03-2009 |
| 20090238306 | PHASE TRACKING CIRCUIT AND RADIO RECEIVER USING THE SAME - A phase tracking circuit includes a divider part dividing an input signal that includes data sub-carriers and pilot sub-carriers into groups so that each of the groups includes at least one of the pilot sub-carriers, and a correcting part correcting phases of data sub-carriers of the input signal included in one of the groups on the basis of an amount of phase rotation of the at least one of the pilot sub-carriers included in the above one of the groups. | 09-24-2009 |
| 20090245427 | JOINT SYNCHRONIZER AND DECODER - A joint synchronizer and decoder that implements two decision aided processes, which are referred to as “decision aided candidate selection” and “decision aided synchronization and decoding.” Decision aided candidate selection may be used to select a carrier frequency offset by selecting among a number of candidates for this parameter based on an indication of decoding success. Decision aided synchronization and decoding may be used for phase tracking based on an indication of decoding success. Although these joint synchronizing and decoding techniques may be implemented together, they may also be implemented independently. The joint synchronizer and decoder may be implemented within a return channel receiver in a DVB-RCS system using turbo coding and quadrature phase shift key (QPSK) data modulation. | 10-01-2009 |
| 20090252258 | PULSE SIGNAL RECEPTION DEVICE, PULSED QPSK SIGNAL RECEPTION DEVICE, AND PULSE SIGNAL RECEPTION METHOD - A pulse signal reception device of a comparatively simple configuration detects a signal sampled at an optimal clock timing for a pulse modulation signal having a signal width shorter than a symbol frequency. In this device, a time division unit ( | 10-08-2009 |
| 20090262866 | DATA CARRIER PROVIDED WITH AT LEAST TWO DECODING STAGES - In a data carrier ( | 10-22-2009 |
| 20090268849 | Passive Miser and Four-Phase Clocking Method and Apparatus - According to one embodiment, a radio frequency receiver comprises a quadrature mixer configured to convert radio frequency signals to baseband signals or intermediate frequency signals. The quadrature mixer comprises an in-phase passive mixer and a quadrature-phase passive mixer. Each passive mixer comprises a mixer core having a plurality of mixer input switch transistors and a plurality of output switch transistors connected to the mixer input switch transistors. Clock circuitry generates a plurality of quadrature pulsed clock signals and delayed versions of the quadrature pulsed clock signals. The quadrature pulsed clock signals and the delayed versions of the quadrature pulsed clock signals drive the mixer input switch transistors and the output switch transistors. | 10-29-2009 |
| 20090279643 | UNBIASED SIGNAL-TO-NOISE RATIO ESTIMATION FOR RECEIVER HAVING CHANNEL ESTIMATION ERROR - Apparatus and methods for estimating transmission noise in a programming information signal. Channel noise power in binary phase shift keying (“BPSK”) modulated telecommunication may be estimated. Such a method may include receiving over the channel a reference signal and a data BPSK signal. The data BPSK signal may include the programming information. The method may include formulating a channel transfer function estimate for the channel based on the reference signal. The estimate may include a channel estimation error. The data BPSK signal may be equalized using the transfer function estimate. The data BPSK signal may include noise, which may be quantified in terms of power. The data BPSK signal noise power may be estimated in such a manner that is independent of the channel estimation error. | 11-12-2009 |
| 20090304112 | SCHEME TO ALLEVIATE SIGNAL DEGRADATION CAUSED BY DIGITAL GAIN CONTROL LOOPS - An amplifier ( | 12-10-2009 |
| 20100091909 | SYSTEMS AND METHODS FOR UNEQUAL ERROR PROTECTION AND SOFT DECISION CALCULATIONS - A wireless communications device ( | 04-15-2010 |
| 20100119014 | DEMODULATING APPARATUS AND DEMODULATING METHOD - This invention relates to a demodulating apparatus and a demodulating method for demodulating an input signal more quickly than before when the channels of the input signal are inverted. | 05-13-2010 |
| 20100119015 | SUPPRESSING INTERFERENCE FOR WIRELESS RECEPTION AND IMPROVEMENTS RELATING TO PROCESSING A FREQUENCY SHIFT KEYED SIGNAL - A communications receiver may include an adaptive filter unit for removing coherent interference components from a received signal. In the absence of a signal of interest, the filter may adapt dynamically to remove current interference components. When a signal of interest is detected, the filter may be controlled to stop (or at least reduce) its adaptation, to prevent removal of the signal of interest. The received signal may be down-converted to a complex baseband by conditioning circuitry. A detector may detect the signal of interest, and control the filter. Autocorrelation may be used to estimate a characteristic of the signal of interest in the complex baseband. The detector may include hysteresis to react quickly to the start of signal of interest, and more slowly to an end of the signal of interest. The signal of interest may be a frequency shift keyed (FSK) signal. A demodulator may demodulate FSK components based on the autocorrelation result. The characteristic of the signal of interest used for detection and/or demodulation may be a directional characteristic of a vector representing the complex baseband signal in complex space. | 05-13-2010 |
| 20100150272 | WIRELESS COMMUNICATIONS DEVICE FOR SIGNAL WITH SELECTED DATA SYMBOL MAPPING AND RELATED METHODS - A wireless communications device may include a wireless receiver for receiving a Gaussian phase shift keyed signal having a selected data symbol mapping, and a demodulator coupled to the wireless receiver for demodulating the Gaussian phase shift keyed signal using memory-less data symbol decisions based upon the selected data symbol mapping. | 06-17-2010 |
| 20100150273 | DEVICE AND METHOD FOR BINARY PHASE SHIFT KEY DEMODULATOR USING PHASE SHIFTER - Disclosed is a binary phase shift key (BPSK) demodulating device using a phase shifter and a method thereof. The BPSK demodulating device includes an I signal generator to generate an in-phase (I) signal from a received BPSK signal, a Q signal generator to generate a quadrature-phase (Q) signal from the received BPSK signal, using a plurality of phase shifters, an oscillator to generate a first signal to separate a baseband signal, and a determining unit to determine a transmission phase angle based on the I signal and the Q signal. | 06-17-2010 |
| 20100166115 | Phase error detection with conditional probabilities - Apparatuses, systems, and methods that employ conditional probabilities to calculate phase errors are disclosed. For a received signal, the embodiments may develop several phase error estimates relative to each point of a constellation, the number and location of points of the constellation depending on the modulation technique of the received signal. In addition to calculating the phase error estimates, the embodiments may also calculate weights, or probabilities, associated with each of the estimates. The embodiments may use the estimates and the weights to calculate a composite phase error estimate. The composite phase error estimate may be used to correct the received signal and eliminate or reduce the impact of the phase error. | 07-01-2010 |
| 20100166116 | METHOD AND DEVICE FOR RECEIVING OPFDM-DQPSK SIGNAL - In the field of communication and transmission, a method and a device for receiving an OPFDM-DQPSK signal are provided. The device includes a power splitter, adapted to split the OPFDM-DQPSK signal into two beams of signals; a polarization beam splitter (PBS), adapted to splitting one of the two beams of signals into a first signal and a second signal; a demultiplexer (Demux), adapted to demultiplex the other beam of signal to obtain a third signal and a fourth signal; two delayers, adapted to delay the third signal and the fourth signal respectively; a first frequency-mixing receiving module, adapted to perform frequency-mixing receiving on the first signal and the delayed third signal; a second frequency-mixing receiving module, adapted to perform frequency-mixing receiving on the second signal and the delayed fourth signal; and a decision recovery module, adapted to recover four logical sequences by performing decision on the four electrical signals. | 07-01-2010 |
| 20100215128 | Enhanced Modulation Detection - An apparatus is provided for demodulating a block, the block including a plurality of bursts. The apparatus comprises a demodulator configured to demodulate the plurality of bursts and a modulation detector configured to detect a modulation scheme for a current burst in the plurality of bursts and to determine whether there is a high probability that the detected modulation scheme is correct. The modulation detector instructs the demodulator to demodulate each burst subsequent to the current burst in the plurality of bursts based on the detected modulation scheme when the modulation detector determines a high probability that the modulation scheme is correct. | 08-26-2010 |
| 20100239051 | Automatic Frequency Correction - A receiver front end receives a local frequency reference signal and a Frequency Shift Keying modulated signal comprising a synchronisation sequence, and downconverts the Frequency Shift Keying modulated signal to provide baseband in-phase and quadrature signals. A pulse generator receives the in-phase and quadrature signals, and generates an in-phase pulse signal ILEAD comprising pulses aligned with edges of the baseband in-phase and quadrature signals when the baseband in-phase signal leads the baseband quadrature signal, and generates a quadrature pulse signal QLEAD comprising pulses aligned with edges of the baseband quadrature and in-phase signals when the baseband quadrature signal leads the baseband in-phase signal. A frequency corrector receives said in-phase and quadrature pulse signals during receipt of said synchronisation sequence, compares the pulse signals to a target, generates a control signal for controlling the local signal generator in dependence upon the result of the comparison. | 09-23-2010 |
| 20100254492 | DATA SIGNAL PHASE REVERSAL CORRECTION METHOD AND SYSTEM IMPLEMENTING THE SAME - A data signal phase reversal correction method and system implementing the same are disclosed. In the present invention, a pilot signal of a satellite is checked to see if there is a phase reversal according to an accumulation of correction results of symbols of the received pilot signal with corresponding symbols of a known pilot sequence. It is determined whether a phase correction of a data signal of the satellite is to be executed or not by referencing the phase reversal determination result of the pilot signal. | 10-07-2010 |
| 20100266068 | Low-IF terrestrial data receiver and related communication systems and methods - Low-IF terrestrial data receivers and related communication systems and methods are disclosed that provide efficient solutions for reception of data services in FM broadcast channels. In particular, systems and methods are provided for data service information modulated on a 67.65 kHz sub-carrier, for example, using QPSK modulation. Intermediate data service information is output by the data receiver, and this intermediate data service information takes the form of demodulated digital I/Q signals provided through a digital interface of the data receiver. As such, partial digital signal processing is provided by the data receiver and the remaining digital processing is provided by a host processor. | 10-21-2010 |
| 20100278286 | COMMUNICATION UNITS, COMMUNICATION SYSTEM AND METHODS FOR MODULATION AND DEMODULATION | 11-04-2010 |
| 20100296609 | OFDM RECEIVING DEVICE, OFDM RECIEIVING METHOD, COMMUNICATION SYSTEM, AND CONTROL PROGRAM FOR OFDM RECEIVING DEVICE - An OFDM receiving device for settling a problem of complicated configuration is provided, in that the OFDM receiving device receives an OFDM signal where no smaller than one specific sub-carriers among plurality of sub-carriers are modulated by a known modulation signal s | 11-25-2010 |
| 20100303174 | APPARATUS FOR PROCESSING RECEIVED SIGNAL, METHOD THEREOF, AND METHOD FOR SELECTING MAPPING RULE - An apparatus for processing a received signal, method thereof, and mapping rule selecting method are disclosed, by which radio communications can be smoothly carried out in a receiving terminal ( | 12-02-2010 |
| 20110013729 | SIGNAL PROCESSING APPARATUS, SIGNAL PROCESSING METHOD, AND RECEPTION SYSTEM - Disclosed herein is a signal processing apparatus including a processing block configured to perform a carrier shift amount detection process for detecting a carrier shift amount constituting a carrier error used for demodulating an orthogonal frequency division multiplexing signal known as the OFDM signal; and a correction block configured to correct the OFDM signal in accordance with the carrier shift amount. The OFDM signal includes a first preamble signal including subcarriers, and a second preamble signal including subcarriers of which the spacing is narrower than the spacing of the subcarriers included in the first preamble signal. The second preamble signal includes pilot signals which are known signals located at intervals of a predetermined number of subcarriers. The processing block detects the carrier shift amount using a correlation of the subcarriers included in one such second preamble signal. | 01-20-2011 |
| 20110096872 | CORRELATION DEVICE AND METHOD - A correlation device and method is provided. According to the present invention, the correlation device comprises a first signal path for receiving a received signal; at least one second signal path for receiving the received signal and eliminating effect of a subcarrier component of the received signal; and a correlation unit couple to the first signal path and each second signal path, for selecting an output of one of the first and second signal paths to execute signal correlation. | 04-28-2011 |
| 20110150143 | SOFT-DECISION DEMAPPING METHOD FOR DIGITAL SIGNAL - Disclosed is a demapping method of a soft-decision of an efficient soft determining scheme which is applicable to a DVB-2 satellite communication system. The soft-decision demapping method for a digital signal received through a transmission channel in a communication system using a phase shift keying (PSK) scheme includes: selecting reference symbols in an area having a higher probability than a predetermined probability that the received signal will be positioned among all reference symbols on a constellation diagram using a most significant bit (MSB) value of the received signal; and acquiring a maximum value of a log likelihood ratio (LLR) for the selected reference symbols. | 06-23-2011 |
| 20110164705 | BIT MAPPING SCHEME FOR AN LDPC CODED 32APSK SYSTEM - A digital communication system, having a transmitter to transmit a digital signal; and a receiver to receive the digital signal; wherein the digital signal utilizes a 32APSK system with FEC coding, and the signal is bit-mapped using gray mapping, and bits of the digital signal are ordered based on the values of a log likelihood ratio from a communications channel. | 07-07-2011 |
| 20110243276 | WIRELESS DEMODULATION CIRCUIT - Positions of a group of points of code shift including a plurality of points of code shift and present in each code-shift site of a multi-valued FSK code are identified, a point of code shift correction amount including an amount of displacement between a center point of code shift centered among the group of points of code shift in a direction of time axis and each of the points of code shift is calculated based on the identified positions of the points of code shift, and the point of code shift is corrected on a time axis based on the calculated point of code shift correction amount. | 10-06-2011 |
| 20110317790 | RECEIVING APPARATUS, RECEIVING METHOD, AND RECEIVING SYSTEM - A receiving apparatus includes: a transmission path characteristics estimating section obtaining pre-interpolation transmission path characteristic data as estimate values for transmission path characteristics as characteristics of a transmission path of an OFDM signal for transmission symbols of pilot signals by using the pilot signals contained in the OFDM signal, and filtering the pre-interpolation transmission path characteristic data by using an interpolation filter, thereby obtaining transmission path characteristic data as estimate values for transmission path characteristics for transmission symbols of the OFDM signal; a distortion correcting section performing distortion correction for the OFDM signal by using the transmission path characteristic data; and a filter controlling section controlling a pass band of the interpolation filter. | 12-29-2011 |
| 20120027131 | Blind Carrier/Timing Recovery and Detection of Modulation Scheme - Systems and methods and memory media for performing modulation type detection. An attempt is made to estimate an underlying symbol rate of a received signal. The received signal is compensated for carrier frequency offset. Two candidates for symbol timing offset are estimated from the compensated signal. The compensated signal is downsampled using each offset candidate. A set of features is computed for each of the two downsampled signals. For each downsampled signal, the set of features is compared to a corresponding set of thresholds to obtain a corresponding set of comparison results. The two sets of comparison results are used to determine the modulation type of the received signal. A second method for estimating symbol rate may be performed if the modulation type is found to be FSK. | 02-02-2012 |
| 20120087445 | Control Modules - A circuit is provided comprising detector circuitry, calculating circuitry, and determining circuitry. The detector circuitry is figured to generate an I data signal magnitude value of a sampled I data signal and a Q data signal magnitude value of a sampled Q data signal. The calculating circuitry is configured to calculate a phase shift angle φ | 04-12-2012 |
| 20120163505 | METHOD AND APPARATUS OF SIGNAL DETECTION IN WIRELESS LOCAL AREA NETWORK SYSTEM - Disclosed is a method and receiver for detecting a wireless signal in a wireless local area network (WLAN) system. The receiver includes a radio frequency (RF) unit which receives a wireless signal; an analog/digital converter (ADC) which converts the wireless signal into a digital signal; a fast Fourier transform (FFT) unit which applies FFT to the digital signal; a multiple inputs and multiple outputs (MIMO) detector which performs channel compensation for the FFT applying result; a constellation-demapping unit which constellation-demaps with regard to the channel compensation result; a decoder which decodes the constellation-demapping result; and a high throughput (HT) detector which determines whether the wireless signal is a signal modulated with quadrature binary phase shift keying (Q-BPSK) constellation obtained by rotating binary phase shift keying (BPSK) constellation at an angle of 90 degrees on the basis of the FFT applying result. | 06-28-2012 |
| 20120207246 | Phase-Shift Keying Demodulators and Smart Cards Including the Same - A phase-shift keying (PSK) demodulator and a smart card including the same are disclosed. The PSK demodulator includes a delay circuit and a sampling circuit. The delay circuit generates a plurality of clock signals by delaying the input signal. The sampling circuit samples the input signal in response to the clock signals, and generates output data. | 08-16-2012 |
| 20120243640 | RECEIVER - A receiver including: an antenna for receiving signals in a plurality of frequency ranges; a plurality of amplifiers, each of the plurality of amplifiers being configured to amplify signals in one of the plurality of frequency ranges; a plurality of receive paths, each of the plurality of receive paths connecting an output of the antenna to an input of one of the plurality of amplifiers, wherein each of the plurality of receive paths includes a power detector for monitoring signal power in the receive path and a switch which can be operated to activate or deactivate the receive path, wherein the switch of each receive path is operable to deactivate the receive path if an overload condition is detected by the power detector of that receive path. | 09-27-2012 |
| 20120250799 | BLIND SYMBOL SYNCHRONIZATION SCHEME FOR OFDM SYSTEM - An Orthogonal Frequency Division Multiplexing (OFDM) receiver system for improved pilotless detection of symbol boundary of a received OFDM symbols using M-ary Phase Shift Keying (M-PSK) modulated carriers as a cost function is provided. The OFDM receiver includes a symbol boundary detection block that detects a symbol boundary of the received OFDM symbols. The symbol boundary detection block detects the symbol boundary by computing cost function of second order moment of the M-PSK modulated carriers. The receiver system is capable of detecting the symbol boundary for unknown information on said received OFDM symbols and thus increases throughput per given transmission bandwidth of a modulation scheme. | 10-04-2012 |
| 20120269298 | PHASE ERROR COMPENSATION ARRANGEMENT AND PHASE ERROR COMPENSATION METHOD - A phase error compensation arrangement comprising a first phase error compensator and a second phase error compensator arranged downstream of the first phase error compensator. The first phase error compensator is configured to obtain a first estimated phase error ((φ | 10-25-2012 |
| 20130107990 | DATA UNIT FORMAT FOR MULTI-USER IN LONG-RANGE WIRELESS LOCAL AREA NETWORKS (WLANS) | 05-02-2013 |
| 20130230125 | DEMAPPING FOR HIERARCHICAL QUADRATURE AMPLITUDE MODULATION - A method and system for demapping a hierarchical signal is disclosed. The method includes receiving a hierarchical signal comprising first and second encoded, modulated signals. A conditional probability relating to the structure of the second encoded, modulated signal is determined. The hierarchical signal is demodulated using the conditional probability to generate a first encoded data stream. The first encoded data stream is decoded to recover information bits. | 09-05-2013 |
| 20130251070 | METHOD AND SYSTEM FOR WIRELESS LOCAL AREA NETWORK (WLAN) PHASE SHIFTER TRAINING - Aspects of a method and system for wireless local area network (WLAN) phase shifter training are presented. Aspect of the system may enable a receiving station, at which is located a plurality of receiving antennas, to estimate the relative phase at which each of the receiving antennas receives signals from a transmitting station. This process may be referred to as phase shifter training. After determining the relative phase for each of the receiving antennas, the receiving station may process received signals by phase shifting the signals received via each of the receiving antennas in accordance with the relative phase shifts determined during the phase shifter training process. Signals received via a selected one of the receiving antennas may be unshifted. The processed signals may be combined to generate a diversity reception signal. | 09-26-2013 |
| 20140037026 | QUADRATURE DEMODULATOR - Provided is a quadrature demodulator capable of appropriately correct an amplitude error and a quadrature error even with respect to a pulse-modulated signal. In the quadrature demodulator | 02-06-2014 |
| 20140086362 | INTERFERENCE CANCELLATION TECHNIQUE FOR CHANNEL ESTIMATION IN OFDM RECEIVERS - Receiver adapted for determining an estimation of interferences when receiving an OFDM signal made of packets, each packet comprising a first training field, a second training field, at least two header fields and data field, comprising:
| 03-27-2014 |
| 20140146923 | Method for Demodulating the HT-SIG Field Used in WLAN Standard - A method for demodulating a signal modulated with a first phase modulation technique with a demodulator adapted to demodulate signals modulated with a second phase modulation technique, the first phase modulation technique being based on a first phase constellation diagram and the second phase modulation technique being based on a second phase constellation diagram, the second phase constellation diagram being obtained by rotating the first phase constellation diagram by an angle being a non-nul integer multiple of 90 degrees, the method comprising: a) rotating the signal modulated with the first phase modulation technique by said angle; and b) demodulating the rotated signal with the demodulator. The method enables to use former optimized demodulator. | 05-29-2014 |
| 20140169503 | DEVICES AND METHODS FOR FACILITATING SIGNAL-TO-NOISE RATIO ESTIMATION OF RECEIVED WIRELESS TRANSMISSIONS - Access terminals are adapted to facilitate estimation of signal-to-noise ratios for received wireless transmissions. According to at least one example, a wireless communication device can receive a plurality of data symbols. The wireless communication device can determine a first estimate of a signal-to-noise ratio based on first estimates of a signal power and a noise power associated with the plurality of received data symbols. When the first estimate of the signal-to-noise ratio is below a predetermined threshold, a second estimate of the signal-to-noise ratio can be determined based on second estimates of the signal power and the noise power for the received data symbols. Other aspects, embodiments, and features are also included. | 06-19-2014 |
| 20140177759 | DEMODULATION METHOD, DEMODULATION DEVICE, AND ELECTRONIC APPARATUS - A satellite signal which carries a navigation message including satellite-specific information is received. Data of the navigation message is demodulated from received satellite signal. Error detection processing is carried out on demodulated data on a word basis of the navigation message. The number of bit transitions is counted at each corresponding bit transition position with respect to a first word in which an error is detected in the error detection processing and which carries the satellite-specific information, and plural second words belonging to a different frame from a frame to which the first word belongs and having a common part with the first word. A bit value of the first word is detected based on the number of bit transitions counted. | 06-26-2014 |
| 20140177760 | SYNCHRONOUS TRANSFER OF STREAMING DATA IN A DISTRIBUTED ANTENNA SYSTEM - Embodiments of the invention provide a method, distributed antenna system, and components that generate a jitter reduced clock signal from a binary encoded data stream transmitted over a communication medium. The method includes receiving a modulated signal that includes the binary encoded data stream and generating a recovered clock signal that is phase locked to the binary encoded data stream. The method further comprises generating a stable recovered clock signal by filtering the recovered clock signal to remove jitter, while allowing the clock signal to track long-term drift. | 06-26-2014 |
| 20140192934 | RECEIVER FILTER FOR DC-WANDER REMOVAL IN A CONTACTLESS SMARTCARD - Embodiments of a method for processing a baseband signal in a Direct Current (DC)-suppressed system, a system for processing a baseband signal in a DC-suppressed system, and a smart card are described. In one embodiment, a method for processing a baseband signal in a DC-suppressed system involves processing the baseband signal in the analog domain with a first high pass filter (HPF), converting the processed baseband signal to a digital signal, and processing the digital signal in the digital domain with a second HPF to provide a discrete-time differentiation of the baseband signal. Other embodiments are also described. | 07-10-2014 |
| 20140219397 | SYSTEM AND METHOD FOR FREQUENCY OFFSET ESTIMATION FOR SIGNALS CONTAINING MULTI-USER SYMBOLS - Systems and methods for frequency offset estimation are provided. A channel impulse response and multi-user signal parameter are jointly estimated. Based on the multi-user signal parameter, a determination is made as to whether the signal contains a single-user signal or a multi-user signal. Then, frequency offset estimation is performed based on this determination. For example, noiseless sample estimates are generated depending on whether the signal is a single-user signal or a multi-user signal. | 08-07-2014 |
| 20140286457 | RECEIVER CIRCUIT AND METHOD FOR CONTROLLING RECEIVER CIRCUIT - A receiver circuit includes: a data interpolation switched capacitor circuit which samples a data signal and outputs a voltage value interpolated from a sampled voltage value in correspondence with an interpolation code indicating an interpolation ratio; a comparator which performs comparison between the voltage value outputted from the data interpolation switched capacitor circuit and a threshold value; a phase detection circuit which detects a boundary based on an output of the comparator and decides whether to advance or delay a phase; and an interpolation code generation circuit which generates an interpolation code corresponding to an output of the phase detection circuit, wherein a phase offset related to sampling is imparted and an offset corresponding to an amount of the phase offset is imparted to the threshold value of the comparator. | 09-25-2014 |
| 20150030106 | RECEIVER CIRCUIT - A receiver circuit includes: first and second phase adjusters that generate first and second clock signals; first and second determinators that perform binary determination on input data in synchronization with the first and second clock signals; a phase detection circuit that detects a phase on the basis of determination values of the first and the second determinators; a filter that performs filtering on the detected phase and thereby outputs first phase information to the second phase adjuster; an adder that adds a shift amount to the first phase information and thereby outputs second phase information to the first phase adjuster; and a corrector that outputs third phase information for decreasing variation in phase difference of the first clock signal with respect to the second clock signal to the first phase adjuster. | 01-29-2015 |
| 20150085959 | DIGITAL VIDEO BROADCAST RECEIVER - A digital video broadcast receiver including a frequency synthesizer, a plurality of frequency dividing-phase shifting circuits, an antenna and a plurality of signal processing modules is provided. The frequency synthesizer synthesizes a first frequency signal. The frequency dividing-phase shifting circuits individually perform a frequency dividing-phase shifting operation on the first frequency signal to generate a plurality of first signals having different frequencies and a plurality of second signals corresponding to the first signals, where each of the first signals is orthogonal to the corresponding second signal. The antenna receives a radio frequency signal. The signal processing modules respectively obtain a plurality of signal components belonging to different sub-bands from the radio frequency signal according to the first signals and the second signals. | 03-26-2015 |
| 20150092890 | EFFICIENT SIGNAL PROCESSING FOR RECEIVE AND TRANSMIT DBF ARRAYS - In a phased-array communications system with a distributed processing architecture, channelized beamforming is used to minimize sampling and computational requirements, as well as reduce the data rates required for the communication of data and control information between system components. A central processor within the phased array system performs parallelized synthesis of channelized beams to form beams composite beams in sub-bands that overlap multiple channels. The phased array system incorporates a flexible scheme for channelization, channelized beamforming, and synthesis so that any number of composite beams may be synthesized in parallel at any one time. The system is capable of simultaneously processing beams that occupy overlapping subbands, and does not require restriction on the bandwidths or center frequencies of the subbands which the beams occupy. | 04-02-2015 |
| 20150312073 | Carrier Phase and Amplitude Estimation for Phase Shift Keying Using Pilots and Data - A least squares estimator of carrier phase and amplitude in a receiver in a communication system using a phase shift keying modulation scheme that uses both known pilot symbols and unknown data symbols is described. That is, the method exploits knowledge of pilot symbols in addition to the unknown data symbols to estimate carrier phase and amplitude. Further, an efficient recursion based estimation method is described that only requires O(L. log L) arithmetic operations where L is the number of received signals. This method uses the M-Ary rounded phase offsets to sort the data symbols and this sorted order is used to recursively calculate candidate values in an optimisation process. Simulation results show that the estimation methods Using data and pilot symbols outperform estimation methods using only data symbols (ie non-coherent detection methods). Further, the system can be used for systems using multiple M-ary phase shift keying digital modulation schemes. | 10-29-2015 |
| 20160006558 | SYNCHRONISATION USING PILOTS AND DATA - A method for estimating a time offset of a transmitted signal which comprises pilot symbols and data symbols, the method comprising: receiving the transmitted signal to produce a received signal; and processing an optimising function of the received signal at a finite number of possible time offsets to produce an estimator of the time offset. | 01-07-2016 |
| 20160028570 | MPSK DEMODULATION APPARATUS AND METHOD - An M-ary Phase Shift Keying (MPSK) demodulation apparatus and method are disclosed herein. The MPSK demodulation apparatus includes an amplifier, a carrier frequency recoverer, a plurality of correlators, and a symbol detector. The amplifier amplifies a received signal. The carrier frequency recoverer recovers a carrier frequency from the received signal, and generates a plurality of signals having a set phase difference. Each of the plurality of correlators outputs a signal, maintained at a set signal level for a specific period of time, using the received signal and the plurality of signals. The symbol detector collects the output signals of the plurality of correlators, and detects a received symbol by comparing the absolute value magnitudes of the collected output signals. | 01-28-2016 |
| 20160072652 | DIGITAL RADIO TRANSMISSIONS - A digital radio receiver adapted to receive radio signals modulated using continuous phase frequency shift keying, CPFSK. The receiver comprises means for receiving a radio signal ( | 03-10-2016 |
| 20160134452 | METHOD TO MINIMIZE INTERFERENCE INTO LEGACY SDARS RECEPTION BY VARYING OVERLAY MODULATING AS A FUNCTION OF SATELLITE POSITION - In exemplary embodiments of the present invention, a degree of hierarchical modulation can be varied as a function of satellite position, which can be related to time of day, and where such hierarchical modulation can be a combination of phase and amplitude shifts. In exemplary embodiments of the present invention, as each satellite in a multiple satellite system broadcasting to North America moves towards a D-node or an A-node position, the offset angle of a phase-based hierarchical modulation scheme can be varied. Thus, in exemplary embodiments of the present invention, the lowest satellite position in the sky can have the lowest offset angle for overlay bits, which offset angle can, for example, progressively increase as the position of the satellite in the sky increases. At a satellite's highest point in the sky, the overlay offset angle can, for example, thus be at its maximum. To aid a receiver to receive such varying overlay modulated data, the value of a varying overlay offset angle (for each satellite) can be embedded in an Overlay Identification Marker (OIM) in the bit stream broadcast by that satellite. In exemplary embodiments of the present invention each satellite broadcast receiver can thus decode each satellite's signal, knowing its respective instantaneous overlay offset angle. The receiver can then use this information to appropriately correct MRC weightings (weighting more heavily the (higher lying) satellite with the higher degree of Layer 2 modulation) before it is MRC combined across various received signal streams. Similar methods can be implemented for other overlay modulation techniques, and the method can be extended to a broadcast system using N satellites, each having a varying degree of Layer 2 modulation. | 05-12-2016 |
| 20160254784 | SIGNAL GENERATOR AND ASSOCIATED PHASE SHIFT APPARATUS AND METHOD | 09-01-2016 |
| 20190149376 | RADIO FREQUENCY (RF) TO DIGITAL POLAR DATA CONVERTER AND TIME-TO-DIGITAL CONVERTER BASED TIME DOMAIN SIGNAL PROCESSING RECEIVER | 05-16-2019 |
| 375330000 | Differential (diphase) | 15 |
| 20090135957 | SYSTEM AND METHOD FOR COMMUNICATING DATA USING WEIGHTED BIT SOFT DECISIONS FOR DIFFERENTIALLY ENCODED PHASE SHIFT KEYING - A receiver includes a signal input for receiving a differentially-encoded quadrature phase-shift keyed (DEQPSK) communication signal. A demodulator performs bit decisions on a received coherent symbol and bit decisions on a received differential symbol. A processor is operative with the demodulator and scales a soft decision by a factor from 0 to 1 when the results of the bit decisions on the received coherent branch and differential branch are different. | 05-28-2009 |
| 20090196376 | DEMODULATION CIRCUIT OF DIFFERENTIAL PHASE SHIFT KEYING (DPSK) MODULATED SIGNALS - A demodulation circuit demodulates a differential phase shift keying (DPSK) modulated received signal. A phase difference data generator compares phase data representing a phase of the received signal input at every predetermined sampling time with previous phase data preceding by one symbol time to generate phase difference data representing a phase shift amount of the phase data. A symbol selection unit evaluates the phase difference data generated at every sampling time to select as a symbol. | 08-06-2009 |
| 20090245428 | METHOD AND APPARATUS FOR PROCESSING COMMUNICATION SIGNAL - Methods and apparatuses process a communication signal to detect a burst packet comprising an access code. The method comprises deriving a differential phase signal indicating differential phases of a first set of the access code in the communication signal, and comparing the differential phase signal with an ideal differential phase signal to calculate a frequency offset value, compensating the differential phase signal by the frequency offset value to generate a compensated differential phase signal, and detecting a burst packet transmitted via the communication signal according to the compensated differential phase signal. | 10-01-2009 |
| 20090268850 | Coarse Frequency Offset Estimation in ISDB Receivers - A method of estimating a coarse frequency offset in a receiver includes providing at least one candidate frequency offset in Orthogonal Frequency-Division Multiplexing (OFDM) symbols having transmission and multiplexing configuration control (TMCC) bins and auxiliary channel (AC) bins, modulating the TMCC bins and AC bins using differential binary phase shift keying (DBPSK) modulation, estimating a phase difference between a first symbol and a second symbol for the candidate frequency offset of the TMCC and AC bins to obtain a resulting phase difference, correcting the resulting phase difference based on a difference between the candidate frequency offset and a Fast Fourier Transform (FFT) center bin to obtain a corrected phase difference, mapping the corrected phase difference to numeric numbers, and adding the numeric numbers for the candidate frequency offset to obtain a summation result. The numeric numbers correspond to at least one of +1 or −1. | 10-29-2009 |
| 20090304113 | Optimal Blind Channel Estimation for DQPSK Demodulation - An apparatus and method are described that provide an optimal blind channel estimation approach for a differential quadrature phase shift keying (DQPSK) modulation communication receiving system. The described blind channel estimation technique takes advantage of the characteristics of DQPSK constellations and the fact that estimates of relative channel phase distortion, and not absolute channel phase distortion, are sufficient for a DQPSK demodulation scheme. The described channel estimation approach provides low complexity, offers improved demodulation performance, and is theoretically optimal. It is particularly useful in existing DQPSK-based communications protocols that do not provide sufficient reference symbols for channel estimation. | 12-10-2009 |
| 20090323865 | Method and Apparatus for Low Power Simultaneous Frequency, Automatic Gain Control and Timing Acquisition in Radio Receivers - A method and apparatus are provided for low power simultaneous frequency, automatic gain control and timing acquisition in a low power radio receiver. A baseband signal received is split into a limited signal having limited data and a non-limited signal. The limited signal is fed through a limited phase-shift keying (PSK) correlation path in which a PSK correlator operating on the limited signal simultaneously determines coarse frequency estimations, timing estimations, and packet synchronization detection. The non-limited signal is fed through an automatic gain control path where automatic gain control is performed on the non-limited signal simultaneously with the coarse frequency and timing estimations and packet synchronization detection performed by the PSK correlator. By operating the PSK correlator on limited data from the received baseband signal and through a separate path from the automatic gain control, substantial power savings are achieved without degrading performance since the preamble time is significantly reduced. | 12-31-2009 |
| 20100128820 | QUADRATURE SIGNAL PHASE CONTROLLER FOR CONTROLLING PHASE - A quadrature signal phase controller includes a first phase shifter and a second phase shifter. The first phase shifter generates phase shifted first in-phase differential output signals and phase shifted first quadrature-phase differential output signals. The second phase shifter generates phase shifted second in-phase differential output signals and phase shifted second quadrature-phase differential output signals. Each of the first and second phase shifters increases or decreases the phase difference between the first in-phase differential output signals and the second quadrature-phase differential output signals, and the phase difference between the second in-phase differential output signals and the first quadrature-phase differential output signals, in response to a change in a level of the first control signal and a change in a level of the second control signal. | 05-27-2010 |
| 20100272218 | METHOD AND APPARATUS FOR COORDINATED MIMO SIGNAL TRANSMISSION AMONG MULTIPLE CELLS IN WIRELESS OFDM SYSTEMS - A FFR (fractional frequency reuse)-based network MIMO (multiple-input multiple-output) transmission architecture in a cellular system that employs cell sectoring using directional antennas. Each cell is sectorized into three outer sectors using three directional antennas which transmit in three different directions using three different frequency subbands. The cell sectors are arranged based on a frequency partition scheme so that three sectors in three neighboring cells form a coordinated group for network MIMO transmission. A regular and a rearranged frequency partition are described. Further, a practical implementation of SON (self organizing network)-based three-cell FFR-based network MIMO for a wireless OFDM system is described. In this implementation, a server connected to multiple base stations (BSs) defines multiple coordinated groups for coordinated MIMO transmission, and the BSs within each coordinated group negotiate a common radio resource region (a composite time-frequency region), and selects a serving mobile station to participate in the coordinated MIMO transmission. | 10-28-2010 |
| 20110188614 | SIMPLIFIED ACQUISITION APPARATUS AND METHOD FOR A BLUETOOTH RECEIVER - An acquisition scheme for receiving a Bluetooth basic data rate (BDR) or enhanced data rate (EDR) packet. A simplified acquisition apparatus for a Bluetooth receiver having a phase differentiator, a plurality of basic building blocks, a plurality of 1-bit switch, and a correlation computation equation. It features a simplified acquisition circuit implementation with a 1-bit correlator hardware shared by access code and EDR synchronization sequence correlation computations. A 4 MHz sampling rate is used for correlation computation. A SINC interpolator is then used to get an 8 or 16 MHz timing resolution for data bit decoding. Based on the measurement results, this simple acquisition scheme can support successful decoding of a received Bluetooth packet with a maximum timing offset of +/−40 ppm and a maximum frequency offset of +/−60 ppm without loss of receiver sensitivity. | 08-04-2011 |
| 20120243641 | QUADRATURE SIGNAL PHASE CONTROLLER FOR CONTROLLING PHASE - A quadrature signal phase controller includes a first phase shifter and a second phase shifter. The first phase shifter generates phase shifted first in-phase differential output signals and phase shifted first quadrature-phase differential output signals. The second phase shifter generates phase shifted second in-phase differential output signals and phase shifted second quadrature-phase differential output signals. Each of the first and second phase shifters increases or decreases the phase difference between the first in-phase differential output signals and the second quadrature-phase differential output signals, and the phase difference between the second in-phase differential output signals and the first quadrature-phase differential output signals, in response to a change in a level of the first control signal and a change in a level of the second control signal. | 09-27-2012 |
| 20120250800 | EARLY DETECTION OF SEGMENT TYPE USING BPSK AND DBPSK MODULATED CARRIERS IN ISDB-T RECEIVERS - A receiver system for early detection of a segment type of an input signal based on BPSK and DBPSK modulated carriers is provided. The receiver system includes a tuner that converts the input signal into an intermediate frequency (IF) signal, a signal conditioning module that converts the IF signal into a baseband signal, a Frequency Domain Synchronisation (FDS) block that detects the segment type of the input signal based on a carrier powers, a Transmission and Multiplexing Configuration Control (TMCC) decode block that performs a decoding operation on the received signal, a channel estimation block that estimates a channel and obtains a channel information. The TMCC decode block uses the channel information obtained from channel estimation block to correct a fast-frequency selective fading on the received signal before the decoding operation. | 10-04-2012 |
| 20120314815 | Method and Receiving Unit for the Detection of Data Symbols - A method and device is provided for detecting data symbols in a received radio signal. Each data symbol is allocated transmit-side a symbol value-specific PN sequence of successive PN chips in the chip clock, and the allocated PN sequences are offset QPSK modulated. The method for incoherent detection includes converting the received radio signal into a complex baseband signal sampled in the chip clock, generating a demodulated signal by differential demodulation of the complex baseband signal, calculating correlation results by correlating the demodulated signal with the derived sequences, and deriving the values of the data symbols by evaluating the correlation results. Each derived sequence is assigned to a PN sequence allocable transmit-side and includes derived chips, whose values correspond to a logic linking of particular PN chips of the PN sequence allocable transmit-side that is assigned the derived sequence. The invention relates furthermore to a corresponding receiving unit. | 12-13-2012 |
| 20140064412 | High Performance Turbo DPSK - A system includes a DPSK transmitter and a DPSK receiver. The DPSK transmitter is configured to encode a signal and transmit the encoded signal as a sequence of symbols. The DPSK receiver is configured to decode the sequence of symbols into bit values. The DPSK receiver further includes a first decoder which is configured to receive the sequence of the symbols, and to estimate extrinsic information for each symbol and forward the extrinsic information to a second decoder. Moreover, if magnitude of a LLR received form a second decoder is greater than a threshold, the first decoder is configured to determine a bit value of a received symbol, without considering neighboring symbols in the sequence of symbols. Still moreover, if the magnitude of the LLR received from the second decoder is not greater than the threshold, the first decoder is configured to continue to decode the received symbol and consider neighboring symbols in the sequence of symbols. | 03-06-2014 |
| 20140270005 | SHARING HARDWARE RESOURCES BETWEEN D-PHY AND N-FACTORIAL TERMINATION NETWORKS - A termination network for a receiver device is provided to support both D-PHY signaling and N-factorial signaling. The first end of each of a plurality dynamically configurable switches is coupled to a common node. A first end of each of a plurality of resistances is coupled to a second end of a corresponding switch. A plurality of terminals receive differential signals and each terminal is coupled to a corresponding second end of a resistance. Each of a plurality differential receivers is coupled between two terminals of the termination network, wherein a first differential receiver and a second differential receiver are coupled to the same two terminals, the first differential receiver is used when the differential signals use a first type of differential signal encoding, the second differential receiver is used when the differential signals use a second type of differential signal encoding. | 09-18-2014 |
| 20150063495 | SOFT DETECTION OF M-ARY DPSK SIGNALS - In some implementations, a method of a receiver includes receiving an M-ary differential phase-shift keying (DPSK) signal containing a phase offset and optionally a phase rotation. The phase offset of the received signal may be estimated. A soft detection metric employing the estimated phase offset may be calculated to provide enhanced receiver performance. The method may include subtracting the phase offset estimate from the received signal prior to calculating the soft detection metric and/or de-rotating the phase of the received signal by the same amount of the phase rotation prior to estimating the phase offset of the received signal. Estimating the phase offset may be based on maximum likelihood principle. The soft detection metric may be a log-likelihood ratio (LLR) for soft detection of the received M-ary DPSK signal and the calculation of the LLR may be based upon a conditional joint probability density function of two consecutively received symbols. | 03-05-2015 |
| 375332000 | Plural phase (>2) | 6 |
| 20080240299 | Demodulation of 16-QAM, DCM data symbols using two hybrid-QPSK constellations - In one embodiment, a demapper uses two hybrid-QPSK constellations to demap pairs of equalized data symbols recovered from 16-QAM, DCM OFDM symbols, wherein the equalized data symbols in a pair correspond to the same four-bit group. A first hybrid-QPSK constellation is generated by combining the real components of both 16-QAM mapping constellations onto one coordinate plane. The demapper generates a first set of two decision variables by combining the real components of each equalized data symbol in a pair to correspond to the first hybrid-QPSK coordinate plane. A log-likelihood ratio is then calculated for both decision variables in the set to determine likelihood estimates for the first and second bits of the four-bit group. This process is repeated for the imaginary components of each corresponding pair of equalized data symbols to generate likelihood estimates for the third and fourth bits of the four-bit group. | 10-02-2008 |
| 20090110119 | DIGITAL SATELLITE BROADCASTING RECEIVING TUNER AND SATELLITE BROADCASTING RECEIVING DEVICE INCLUDING THE SAME - When a satellite broadcasting receiving device | 04-30-2009 |
| 20090238307 | DIGITALLY CONTROLLED PHASE INTERPOLATOR CIRCUIT - Digitally controlled phase interpolator circuit. A phase selection control word undergoes decoding to generate a switch control word. The phase selection control word includes 2 quadrant indicating bits and phase interpolating bits for a 4 clock scheme (e.g., 4 clocks having phases 0°, 90°, 180°, and 270°). Such a phase selection control word could includes 3 sector indicating bits and phase interpolating bits for an 8 clock scheme (e.g., 8 clocks having phases 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°). The gates of a number of differential pairs of transistors receive the various clock signals. A number of switching circuits direct current from corresponding current sources/supplies to coupled sources of the differential pairs of transistors, and an output clock is taken from coupled drains of the differential pairs of transistors. One or more current sources/supplies can be implemented to provide continuous current (e.g., in an always on manner) to the differential pairs of transistors. | 09-24-2009 |
| 20090296858 | DEM SYSTEM, DELTA-SIGMA A/D CONVERTER, AND RECEIVER - A DEM (dynamic element matching) system in which a digital signal is inputted, has a switching circuit which, being equipped with a plurality of switches, each of the plurality of switches is subjected to on/off control based on a switch control signal, receives a first thermometer code in which the total number of logic ones and logic zeros corresponding to the digital signal is “n” and outputs a second thermometer code in which the total number of logic ones and logic zeros is “n” (where “n” is an integer equal to or larger than 2), a latch circuit which latches the second thermometer code output from the switching circuit and outputs the second thermometer code, and a switch control signal generating circuit which generates the switch control signal using the digital signal or the second thermometer code output from the latch circuit and outputs the switch control signal. | 12-03-2009 |
| 20100098192 | BIT LOG LIKELIHOOD RATION EVALUATION - A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either k | 04-22-2010 |
| 20160080188 | DATA UNIT FORMAT FOR SINGLE USER BEAMFORMING IN LONG-RANGE WIRELESS LOCAL AREA NETWORKS (WLANS) - A method includes receiving data units each having a preamble with first and second preamble portions, detecting symbol constellation rotations of OFDM symbols in the first preamble portions, and determining, based on the detected rotations, whether the preambles conform to a first format. The method also includes, when it is determined that a preamble conforms to the first format, processing the second preamble portion according to the first format, and, when it is determined that a preamble does not conform to the first format, (i) determining whether information bits in the first preamble portion indicate a single- or multi-user data unit, (ii) when it is determined that the information bits indicate a single-user data unit, processing the second preamble portion according to a second format, and (iii) when it is determined that the information bits indicate a multi-user data unit, processing the second preamble portion according to a third format. | 03-17-2016 |
| 375333000 | Biphase (manchester code) | 2 |
| 20140314185 | METHOD AND APPARATUS FOR IMPULSIVE NOISE MITIGATION USING ADAPTIVE BLANKER BASED ON BPSK MODULATION SYSTEM - A method for impulsive noise mitigation using an adaptive blanker based on BPSK modulation system includes estimating narrowband Middleton parameters of impulsive noise from signals received for a fixed time period; calculating a threshold using the estimated narrowband Middleton parameters; operating the first blanker to suppress impulsive noise from the signal received at a given point of time through the comparison of the SNR value of the received signal and the threshold. Further, the method includes operating the second blanker to suppress impulsive noise from the received signal through the comparison of the summation of the threshold and the SNR value with an absolute value of the received signal, when the SNR value is above the threshold. | 10-23-2014 |
| 20160254902 | BMC PROCESSING CIRCUIT, USB POWER DELIVERY CONTROLLER, BMC RECEPTION METHOD, AND NON-TRANSITORY COMPUTER READABLE MEDIUM STORING BMC RECEPTION PROGRAM | 09-01-2016 |
