Plural Phase (>2) Patents (Class 375/332)
  • Patent number: 10270460
    Abstract: An analog-to-digital converter includes a ring oscillator having an input for receiving an analog signal, a coarse Gray code counter having a first input coupled to a first output of the ring oscillator and a second input for receiving a clock signal, a fine counter having first inputs coupled to secondary outputs of the ring oscillator and a second input for receiving the clock signal, a first difference generator having an input coupled to the output of the coarse counter, a second difference generator having an input coupled to the output of the fine counter, and an adder having a first input coupled to the output of the first difference generator, a second input coupled to the output of the second difference generator, and an output for providing a digital signal corresponding to the analog signal.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: April 23, 2019
    Assignee: INFINEON TECHNOLOGIES AG
    Inventors: Cesare Buffa, Fernando Cardes Garcia, Luis Hernandez-Corporales, Carlos Andres Perez Cruz, Andres Quintero Alonso, Andreas Wiesbauer
  • Patent number: 9998170
    Abstract: An active phased array transmitter includes: a transmission frequency signal source that generates a transmission frequency signal; a modulator that modulates the transmission frequency signal based on transmission data and outputs the modulated transmission signal; a plurality of transmitters that change the phase and intensity of the modulated transmission signal; a transmission phased array antenna including a plurality of transmission antennas; a local transmission frequency signal source that generates a local transmission frequency signal; a first mixer that generates a first intermediate frequency transmission signal from a received signal of the radio waves output from the transmission antennas and the local transmission frequency signal; a second mixer that generates a second intermediate frequency transmission signal from the modulated transmission signal and the local transmission frequency signal; a transmission correlation processing circuitry that detects a transmission correlation relationship;
    Type: Grant
    Filed: February 6, 2017
    Date of Patent: June 12, 2018
    Assignee: FUJITSU LIMITED
    Inventor: Hiroshi Matsumura
  • Patent number: 9781489
    Abstract: The present invention provides a digital video broadcasting-terrestrial (DVB-T) system and modulation method thereof. The system comprises a transmission module and a receiving module. The transmission module modulates a video signal to a DVB-T signal. The receiving module receives the DVB-T signal via a transmission line and demodulates the DVB-T signal to the video signal, and at the same time, monitoring the signal-to-noise ratio (SNR) or bit error rate (BER), and quantizes them to a reference data. The receiving module transmits the reference data to the transmission module through the same transmission line. The system can determine a control parameter according to the reference data to set the modulation parameter of the DVB-T signal.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: October 3, 2017
    Assignee: ATEN INTERNATIONAL CO., LTD.
    Inventor: Kuo-feng Kao
  • Patent number: 9755605
    Abstract: This disclosure generally pertains to volume control of audio output by a device. A piecewise curve may be used to implement volume control using two or more curves segments. The piecewise curve may be implemented by a signal converter. The curve segments may be selected to provide volume control that provides incremental changes in amplification at mid-level to high level volumes, while providing anticipated amplification at lower volumes which satisfy users' expectations. In some instances, different piecewise curves may be selected for different types of audio so that these different types of audio are provided to users at an expected volume and/or in a meaningful way. When multiple audio outputs occur at a same time, the piecewise curves associated with some of the audio outputs may be dynamically adjusted or updated based on the presence of the other ones of the multiple audio outputs and/or ambient noise.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: September 5, 2017
    Assignee: Amazon Technologies, Inc.
    Inventors: Meng Li, Arnaud Jean-Louis Charton, Catherine Michelle Loo
  • Patent number: 9686103
    Abstract: A method for compensating the frequency dependent phase imbalance in a receiver is provided. The receiver downconverts an input signal to generate the signal r(t). The signal r(t) has an in-phase component rI(t) and a quadrature component rQ(t). A first test signal with a first carrier frequency is applied as the input signal of the receiver to obtain a first phase imbalance I. A second test signal with a second carrier frequency is applying as the input signal of the receiver to obtain a second phase imbalance. An IQ delay mismatch ?t of the receiver according to the difference of the second and the first phase imbalances and the difference of the second and the first carrier frequencies is obtained. The in-phase component rI(t) and the quadrature component rQ(t) of the signal r(t) corresponding to other input signal is compensated according to the obtained IQ delay mismatch ?t.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: June 20, 2017
    Assignee: MEDIATEK INC.
    Inventors: Kuo-Hao Chen, Chun-Hao Liao, Pei-Shiun Chung, Hsin-Hung Chen
  • Patent number: 9438307
    Abstract: A robust time shift tracking UWB receiver. After translating in baseband by a quadrature demodulator, the received UWB pulsed signal is integrated on successive time windows, and then sampled. The complex samples are then correlated with a coding sequence from the transmitter and then transmitted on the one hand to a phase estimator and a demodulating/detecting module. The latter estimates the symbol emitted and provides it to the estimator which removes the modulation effect for estimating, at each time-symbol, the phase of the complex samples. A phase rotation follow-up module determines a compensated phase rotation and a non-compensated phase rotation from a reference instant. Controlling means deduce from the non-compensated phase rotation a time offset to be applied to the integration windows.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: September 6, 2016
    Assignee: Commissariat a l'energie atomique et aux energies alternatives
    Inventors: Francois Dehmas, Laurent Ouvry, Manuel Pezzin
  • Patent number: 9350469
    Abstract: A system and method are provided for calibrating the IQ-imbalance in a low-IF receiver. A Test Signal can be generated in a mirror frequency and conveyed to the receiver. The power of the signal produced in the receiver from the conveyed Test Signal can be measured. In the absence of an IQ-imbalance, the Test Signal can be completely eliminated in the receiver and the corresponding measured power of the produced signal can be minimized. Accordingly, a two dimensional algorithm is described for calibrating a receiver and correcting the IQ-imbalance by adjusting the phase and gain difference between the I and Q channels in the receiver based on the measured power of the signal produced in the receiver.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: May 24, 2016
    Assignee: SITUNE CORPORATION
    Inventors: Saeid Mehrmanesh, Vahid Mesgarpour Toosi, Mahdi Khoshgard
  • Patent number: 9178630
    Abstract: A receiving circuit includes: an interpolation circuit that generates, by using an interpolation coefficient, output data including a data point and a boundary point from pieces of input data that are input in chronological order; a detection circuit that outputs a detection signal when the detection circuit detects a phase of the output data by using the boundary point of the output data; a low pass filter that filters the detection signal and generates the interpolation coefficient; and a modulation circuit that modulates, by using a modulation signal having a frequency different from a cutoff frequency of the low pass filter, the interpolation coefficient generated by the low pass filter, and outputs the modulated interpolation coefficient to the interpolation circuit.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: November 3, 2015
    Assignee: FUJITSU LIMITED
    Inventor: Yoshiyasu Doi
  • Patent number: 9166737
    Abstract: Methods and apparatuses are described for a User Equipment (UE) to receive enhanced Control CHannels (eCCHs), including enhanced Physical Downlink Control CHannels (ePDCCHs), transmitted in a set of Resource Blocks (RBs) over a Transmission Time Interval (TTI). A method includes transmitting a first control signal to a first UE over a first number of Resource Elements (Res) in a subset of the RBs and over a first number of the transmission symbols in the TTI; transmitting a second control signal to a second UE over a second number of the REs in the subset of the RBs and over a second number of the transmission symbols in the TTI; and transmitting a reference signal of the first type over a third number of the REs in the subset of the RBs and over a third number of the transmission symbols in the TTI.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: October 20, 2015
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Aris Papasakellariou, Young-Bum Kim, Jianzhong Zhang
  • Patent number: 9136899
    Abstract: Integrated circuit transceiver circuitry (2) includes a first resonant circuit (3A) coupled to a narrowband interface (6,7A,7B,21) between a first amplifier (3,20) and an interfacing circuit (4,8,9,44), including a programmable first reactive element (C) and a second reactive element (L). Amplitude sensing circuitry (42) senses a maximum amplitude of an in-phase signal (I) or a quadrature-phase signal (Q). An on-chip first tone generation circuit (38,38A,38B,38C) generates tones for injection into the in-phase signal and the quadrature-phase signal and operates in response to frequency scanning circuitry (30) and the amplitude sensing circuitry to adjust the first reactive element (C) to calibrate the first resonant circuit to a desired resonant frequency by selectively coupling reactive sub-elements (1,2,4,8 . . . ×Cv) into the first reactive element (C).
    Type: Grant
    Filed: June 3, 2013
    Date of Patent: September 15, 2015
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Sudipto Chakraborty
  • Patent number: 9137065
    Abstract: Methods, systems, and devices are described for mitigating phase noise. An output of a decoder is utilized to generate an estimation of a plurality of transmitted symbols. One or more phase errors of a plurality of received symbols are generated. The one or more phase errors are based at least in part on the estimation of the plurality of transmitted symbols. The one or more phase errors are generated by comparing angles between the plurality of received symbols and the estimation of the plurality of transmitted symbols. The output of the decoder used to generate the estimation is a plurality of a posteriori log-likelihood ratios (LLRs) of a plurality of transmitted bits. The estimation is generated by performing hard decision decoding on the output of the decoder and remodulating the hard decision decoding according to the modulation used by a transmitter on the plurality of transmitted bits.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: September 15, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Maxim Gotman, Ziv Alina
  • Patent number: 9118451
    Abstract: A receiver circuit includes: an input ADC configured to convert an input data signal to sample data in accordance with a clock; a boundary phase computation circuit configured to determine the boundary phase of the input data signal based on the sample data; an eye pattern computation circuit configured to compute a maximum amplitude phase of an eye pattern of the input data signal based on the sample data and the boundary phase; and a determination circuit configured to determine a value of the input data signal in the maximum amplitude phase based on the sample data and the maximum amplitude phase.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: August 25, 2015
    Assignee: Fujitsu Limited
    Inventors: Masaya Kibune, Hirotaka Tamura
  • Patent number: 9094024
    Abstract: There is provided a signal processing apparatus including an oscillating unit having a division ratio of an integer that performs oscillation at a predetermined oscillation frequency, a frequency transforming unit that transforms a frequency of a signal of a processing target using a signal of the oscillation frequency obtained by the oscillation of the oscillating unit, and a correcting unit that corrects an error of the frequency of the signal of the processing target transformed by the frequency transforming unit based on an error of the oscillation frequency.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: July 28, 2015
    Assignee: Sony Corporation
    Inventors: Satoshi Suda, Hideki Yokoshima, Yoshihisa Takaike
  • Patent number: 9036740
    Abstract: An image rejection (IR) circuit is configured to receive a complex signal from a radio frequency (RF) mixer, where the complex signal includes an in-phase signal portion and a quadrature signal portion. This IR circuit may include: an in-phase path to remove first mismatch information from the in-phase signal portion and associated with at least one in-phase multi-tap filter; a quadrature path to remove second mismatch information from the quadrature signal portion and associated with at least one quadrature multi-tap filter; and a correlation unit to independently update each of the multiple taps of the in-phase multi-tap filter and the quadrature multi-tap filter according to a priority scheme.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: May 19, 2015
    Assignee: Silicon Laboratories Inc.
    Inventors: John Khoury, Yan Zhou
  • Patent number: 9020077
    Abstract: 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 (M1, M2, M3, M4). The complex intermediate frequency mixer further comprises a first, second, third and fourth gain adjusting component (?1, ?2, ?2, ?1), connected to a first, second, third and fourth mixer output (M1-out, M2-out, M3-out, M4-out), respectively. Moreover, a first summing unit (S1), connected to a first gain output (?1-out), a fourth gain output (?1-out) and a third mixer output (M3-out) negated, and second summing unit (S2), connected to the second gain output (?2-out), the third gain output (?2-out) and the fourth mixer output (M4-out), are configured to output a first baseband complex signal of the received complex IF signal.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: April 28, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Lars Sundström, Fenghao Mu, Leif Wilhelmsson
  • Patent number: 9019031
    Abstract: A method for phase modulation of a carrier signal from a transmitter to a contactless transponder in which data is coded as consecutive symbols, each corresponding to a predefined number of carrier cycles, and in which a symbol time is at least two cycles of the carrier signal includes, at the transmitter, spreading a phase jump of a symbol in relation to a preceding symbol over a first part of the symbol time. The establishment of the phase jump is completed in the first part of the symbol time. The periods of the cycles are constant during a second part of the symbol time.
    Type: Grant
    Filed: June 24, 2011
    Date of Patent: April 28, 2015
    Assignee: Commissariat à l'énergie atomique et aux énergies alternatives
    Inventors: Jacques Reverdy, Elisabeth Crochon, Francois Dehmas, Florian Pebay-Peyroula
  • Patent number: 9014306
    Abstract: 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.
    Type: Grant
    Filed: April 14, 2011
    Date of Patent: April 21, 2015
    Assignee: Broadcom Corporation
    Inventor: Farzad Etemadi
  • Patent number: 9014292
    Abstract: Provided is a precoding method for generating, from a plurality of baseband signals, a plurality of precoded signals to be transmitted over the same frequency bandwidth at the same time, including the steps of selecting a matrix F[i] from among N matrices, which define precoding performed on the plurality of baseband signals, while switching between the N matrices, i being an integer from 0 to N?1, and N being an integer at least two, generating a first precoded signal z1 and a second precoded signal z2, generating a first encoded block and a second encoded block using a predetermined error correction block encoding method, generating a baseband signal with M symbols from the first encoded block and a baseband signal with M symbols the second encoded block, and precoding a combination of the generated baseband signals to generate a precoded signal having M slots.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: April 21, 2015
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 9008236
    Abstract: Symbol detection and soft demapping methods and systems are provided. Individual subset symbol detection according to one or more embodiments involves identifying a search subset of a transmission symbol set for a transmission symbol. For each other transmission symbol in communication signals, multiple search subsets of the transmission symbol set are identified. The multiple search subsets include respective search subsets based on each transmission symbol in either the search subset for the first identified one of the transmission symbols or each of the multiple search subsets identified for a different one of the other transmission symbols. Symbol detection errors may be detected by identifying competing symbols and computing competing distances. Soft demapping may be provided by calculating soft decision results based on detected symbols and weighting the soft decision result.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: April 14, 2015
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Ming Jia, Peiying Zhu, Wen Tong, Jianglei Ma
  • Patent number: 9008234
    Abstract: A method for transmitting and receiving a signal and an apparatus for transmitting and receiving a signal are disclosed. The method includes receiving the signal from a first frequency band in a signal frame including at least one frequency band, demodulating the received signal by an orthogonal frequency division multiplexing (OFDM) method and parsing the signal frame, acquiring a symbol stream of a service stream from the at least one frequency band included in the parsed signal frame, demapping symbols included in the symbol stream and outputting the demapped symbols to sub streams, multiplexing the output sub streams and outputting one bit stream, and deinterleaving and error-correction-decoding the output bit stream.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: April 14, 2015
    Assignee: LG Electronics Inc.
    Inventors: Woo Suk Ko, Sang Chul Moon
  • Publication number: 20150092888
    Abstract: An transmitting apparatus is provided. The transmitting apparatus includes a modulator which performs a QPSK-modulation for original data by using a different constellation combination pattern by predetermined unit, and a transmitter which transmits the QPSK-modulated data. Accordingly, BEP performance may be improved by transmitting additional data according to a constellation combination patter in hidden form.
    Type: Application
    Filed: October 1, 2014
    Publication date: April 2, 2015
    Inventors: Dong Seog Han, Eun Su Kang
  • Patent number: 8976904
    Abstract: Methods and systems to vary an erasure slicer threshold based on a measure computed from prior soft and/or hard symbol decisions, identify reliable symbol estimates based on the threshold, identify unreliable symbol estimates for erasure based on the threshold, modify the identified symbol estimates, output the reliable symbol estimates and the modified symbol estimates as erasure slicer decisions, and filter the decisions in a feedback filter of a decision feedback equalizer (DFE). The erasure slicer threshold may be based on signal-to-noise ratio (SNR) or mean-squared-error (MSE). A symbol estimate may be identified for erasure when a coordinate of the corresponding soft decision is within an erasure area defined by the threshold. Symbol modification may include replacing a corresponding coordinate of the symbol estimate with a coordinate of a decision boundary associated with the erasure area.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: March 10, 2015
    Assignee: Intel Corporation
    Inventor: Noam Tal
  • Patent number: 8976905
    Abstract: A robust differential receiver is described that may be used in any frequency modulated system, including short-range radio frequency (RF) communication devices. The differential receiver provides a preamble detection approach that reduces false preamble detection, a fine carrier frequency (CFO) estimation approach that provides an extended estimation range, and robust in-band and out-of-band interference detection. The described differential receiver assures that preamble detections are not falsely triggered, and that CFO estimates are based on accurately modeled preamble waveforms that have not been distorted by phase ambiguities or in-band distortion.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: March 10, 2015
    Assignee: Marvell International Ltd.
    Inventors: Quan Zhou, Songping Wu, Hui-Ling Lou
  • Patent number: 8971453
    Abstract: 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.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: March 3, 2015
    Assignee: Uniband Electronic Corp.
    Inventors: Yiping Fan, Chun-Yuan Lin, Sheng-Chia Huang, Chun-Chin Chen
  • Patent number: 8964909
    Abstract: The present invention provides for making code rate adjustments and modulation type adjustments in a pseudonoise (PN) encoded CDMA system. Coding rate adjustments may be made by changing the number of information bits per symbol, or Forward Error Code (FEC) coding rate. A forward error correction (FEC) block size is maintained at a constant amount. Therefore, as the number of information bits per symbol are increased, an integer multiple of bits per epoch is always maintained. The scheme permits for a greater flexibility and selection of effective data rates providing information bit rates ranging from, for example, approximately 50 kilobits per second to over 5 mega bits per second (Mbps) in one preferred embodiment.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: February 24, 2015
    Assignee: Intel Corporation
    Inventors: John E. Hoffman, George Rodney Nelson, Jr., Daniel I. Riley, Antoine J. Rouphael, James A. Proctor, Jr.
  • Patent number: 8942320
    Abstract: A method includes receiving a data unit that includes a signal (SIG) field and a data field. The SIG field provides information for interpreting the data field. The method also includes detecting a first symbol constellation rotation of at least a first orthogonal frequency division multiplexing (OFDM) symbol in the SIG field of the data unit, determining, based at least in part on the detected first symbol constellation rotation, a number of information bits per OFDM symbol in the SIG field of the data unit, processing the SIG field of the data unit according to the determined number of information bits per OFDM symbol in the SIG field, and processing the data field of the data unit according to the information for interpreting the data field as provided in the SIG field of the data unit.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: January 27, 2015
    Assignee: Marvell World Trade Ltd.
    Inventors: Hongyuan Zhang, Raja Banerjea
  • Patent number: 8942324
    Abstract: A circuit, use, and method for controlling a receiver circuit is provided, wherein a complex baseband signal is generated from a received signal, a phase difference between a phase of the complex baseband signal and a phase precalculated from previous sampled values is determined, the phase difference is compared with a first threshold, a number is determined by counting the exceedances of the first threshold by the phase difference, a number of the counted exceedances is compared with a second threshold, and the receiver circuit is turned off if the number of counted exceedances exceeds the second threshold within a time period.
    Type: Grant
    Filed: December 30, 2013
    Date of Patent: January 27, 2015
    Assignee: Atmel Corporation
    Inventors: Ulrich Grosskinsky, Werner Blatz
  • Patent number: 8934524
    Abstract: A method detects a threshold crossing instant at which a signal crosses a threshold, by: sampling the signal at plural sampling instants spaced from one another by a sampling period; detecting consecutive first and second sampling instants at which the signal has a first signal value lower than or equal to the threshold, and the signal has a second signal value higher than the threshold, respectively; calculating a first interval indicative of a time between the threshold crossing instant and the first sampling instant; setting a reference signal having a reference amplitude representing the first interval relative to a reference scale; generating a signal with a delay depending on said reference signal; generating a threshold crossing detection signal at an instant delayed by a second interval; calibrating the reference scale of the reference amplitude so that the second interval is substantially equal to the first interval.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: January 13, 2015
    Inventor: Maurizio Casti
  • Patent number: 8908810
    Abstract: A system and method are provided for implementing a soft Reed-Solomon (RS) decoding scheme, technique or algorithm to improve physical layer performance in cable modems and cable gateways. The algorithm is implemented in a forward error correction (FEC) module connected to a QAM demodulator. The RS decoding scheme is implemented without significantly complicating hardware or processing overhead. The soft Reed-Solomon (RS) decoding scheme extracts candidate RS symbols and their Log Likelihood Ratios (LLRs) from QAM symbols. The set of highest probable candidate blocks are then chosen and these are decoded using a variant of the Chase algorithm until a valid codeword is detected at the decoder output.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: December 9, 2014
    Assignee: Intel Corporation
    Inventors: Bernard Arambepola, Murat Badem, Parveen K. Shukla, Sahan Gamage, Thushara Hewavithana, Naor Goldman
  • Publication number: 20140341317
    Abstract: Provided is a precoding method for generating, from a plurality of baseband signals, a plurality of precoded signals to be transmitted over the same frequency bandwidth at the same time, including the steps of selecting a matrix F[i] from among N matrices, which define precoding performed on the plurality of baseband signals, while switching between the N matrices, i being an integer from 0 to N?1, and N being an integer at least two, generating a first precoded signal z1 and a second precoded signal z2, generating a first encoded block and a second encoded block using a predetermined error correction block encoding method, generating a baseband signal with M symbols from the first encoded block and a baseband signal with M symbols the second encoded block, and precoding a combination of the generated baseband signals to generate a precoded signal having M slots.
    Type: Application
    Filed: July 30, 2014
    Publication date: November 20, 2014
    Inventors: Yutaka MURAKAMI, Tomohiro KIMURA, Mikihiro OUCHI
  • Patent number: 8891661
    Abstract: Techniques for data transmission using high-order modulation are provided. According to one aspect, parameters of a transmission link are determined, and a multilevel coding scheme and a high-order modulation signal constellation are selected on the basis of the determined parameters. An information indicating the selected multilevel coding scheme and high-order modulation signal constellation and data symbols encoded according to the selected multilevel coding scheme and high-order modulation signal constellation are transmitted. In other aspects, QPSK data symbols are embedded between M-QAM data symbols or M-PSK data symbols with M>4. The QPSK data symbols may be used to improve the efficiency of the decoding process.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: November 18, 2014
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Udo Seier, Khaled Fazel
  • Patent number: 8885776
    Abstract: A symbol error detector can be configured to detect symbol errors of a Bluetooth enhanced data rate (EDR) packet without relying solely on a CRC error detection mechanism. After a phase of a current symbol is demodulated to determine a demodulated current symbol, the phase of the demodulated current symbol can be subtracted from the phase of the current symbol prior to demodulation to yield a phase error. The phase error can be compared against a phase error threshold to determine a potential unreliability of the demodulated current symbol. The phase error being greater than the phase error threshold can indicate that the demodulated current symbol may be unreliable. Accordingly, a symbol error notification can be generated to indicate that the demodulated current symbol may be unreliable.
    Type: Grant
    Filed: February 19, 2013
    Date of Patent: November 11, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Soner Ozgur
  • Patent number: 8855243
    Abstract: A method and system for performing complex sampling of signals using two or more sampling channels and calculating time delays between these channels.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: October 7, 2014
    Assignee: Elta Systems Ltd.
    Inventors: Moshe Fireaizen, David Karasik
  • Patent number: 8848834
    Abstract: A method for detecting a format of a frame in a communication system is presented. An embodiment of the method includes receiving the frame comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols. The plurality of OFDM symbols may include at least one signal field symbol. The method further includes determining a modulation associated with the at least one signal field symbol. The modulation may be a first modulation or a second modulation. Also, the method includes estimating a position of the at least one signal field symbol among the plurality of symbols, and extracting a coding rate of the received frame. The method then includes detecting the format of the received frame based on the determined modulation and the estimated position of the at least one signal field symbol, and the extracted coding rate of the received frame.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: September 30, 2014
    Assignee: Uurmi Systems Pvt. Ltd
    Inventor: Nanda Kishore Chavali
  • Patent number: 8792593
    Abstract: According to one embodiment, a radio receiver includes an antenna, a low-noise amplifier (LNA), a quadrature demodulator, an analog-to-digital converter (ADC), first and second power calculators, a correlation value calculator, a correction parameter generator, a corrector, a demodulator, and a controller. The antenna receives a signal. The LNA amplifies the received signal. The quadrature demodulator demodulates the amplified signal. The ADC converts analog IQ into digital IQ. The first and second power calculators calculate the first and second powers, respectively. The correlation value calculator calculates a correlation value between the digital IQ. The correction parameter generator generates a correction parameter based on the first and second power expected values, and the correlation value between the digital IQ. The corrector performs a linear transform operation. The demodulator demodulates the corrected IQ. The controller generates a gain control signal.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: July 29, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Toshiyuki Yamagishi
  • Patent number: 8755466
    Abstract: A receiver, receiving method, and use of an in-phase signal and a quadrature-phase signal is provided, that includes a mixer in the receiving path, an oscillator whose output is connected to a mixer input of the mixer, whereby the oscillator is formed to output a base signal, oscillating at a base frequency, at the output, a clock generation device to generate a clock signal from the base signal, whose input is connected to the output of the oscillator, whereby the clock generation device has a frequency converter for converting a base frequency of the base signal by the factor F=x+A, where x is a positive whole number and A a rational number between 0 and 1, and a signal processing device, which is connected downstream of the mixer in the receive path, whereby the signal processing device is connected to the clock generation device for control with the clock signal.
    Type: Grant
    Filed: January 23, 2009
    Date of Patent: June 17, 2014
    Assignee: Atmel Corporation
    Inventor: Marco Schwarzmueller
  • Patent number: 8750151
    Abstract: Techniques to calibrate downlink and uplink channels to account for differences in the frequency responses of transmit and receive chains are described. In one embodiment, pilots are transmitted on downlink and uplink channels and used to derive estimates of the downlink and uplink channel responses, respectively. Sets of correction factors are then determined based on estimates of downlink and uplink channel responses. A calibrated downlink channel is formed using a first set of correction factors for the downlink channel, and a calibrated uplink channel is formed using a second set of correction factors for the uplink channel. The first and second sets of correction factors may be determined using a matrix-ratio computation or a minimum mean square error computation. The calibration may be performed in real-time based on over-the-air transmission. Other aspects, embodiments, and features are also claimed and described.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: June 10, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Mark S. Wallace, John W. Ketchum, Jay Rodney Walton, Steven J. Howard
  • Patent number: 8724744
    Abstract: The present invention discloses a method and apparatus for wide dynamic range phase conversion. In one embodiment, inphase and quadrature signal components of a complex input signal are collapsed into a single quadrant to produce a first signal representation. A scaling operation is subsequently performed on the first signal representation to produce a second signal representation. Lastly, the second signal representation is converted into the phase domain.
    Type: Grant
    Filed: August 19, 2005
    Date of Patent: May 13, 2014
    Assignee: General Instrument Corporation
    Inventors: David P. Gurney, Anthony R. Schooler
  • Patent number: 8718196
    Abstract: A symbol error detector can be configured to detect symbol errors of GFSK modulated portions of a Bluetooth packet without relying solely on a CRC error detection mechanism. The symbol error detector can operate on frequency error signals that are a difference between a frequency associated with a current symbol and predetermined frequency outputs from a bank of filters matched to a frequency response of the Bluetooth receiver for predefined combinations of three consecutive symbols (i.e., an estimated previously decoded symbol, an estimated current symbol, and an estimated subsequent symbol). The frequency error signals can be compared against a threshold and against each other to determine a potential unreliability in decoding the current symbol and to determine whether to generate a symbol error notification. The frequency error signals being within a threshold of each other can indicate potential unreliability in decoding the current symbol.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: May 6, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Soner Ozgur
  • Patent number: 8705665
    Abstract: A process for computing Log-Likelihood-ratios (LLRs) in a detector of a wireless communication receiver is disclosed, with the, LLRs being used by a channel decoder. A signal is received from a telecom front end, the signal corresponding to data belonging to a finite set of constellation symbols, each constellation symbol being arranged in a lattice constellation impaired by additive noise and a multiplicative channel. A limited set of distances representative of Euclidian distances between the received signal and a finite set of predetermined constellation symbols are computed, possibly multiplied by the channel. A set of soft decision LLRs are derived from the computed set of distances under the constraint of a limited length of the list of distances. The derived LLRs are completed by clipping values read from a look-up table which is simultaneously addressed by the values of the SNR and a bit index.
    Type: Grant
    Filed: February 14, 2011
    Date of Patent: April 22, 2014
    Assignee: ST-Ericsson SA
    Inventors: Andrea Ancora, Sebastien Aubert
  • Patent number: 8705663
    Abstract: A receiver is described. The receiver includes a first injection-locked oscillator having a first input configured to receive a BPSK signal and a second input configured to receive a first frequency reference. The receiver also includes a second injection-locked oscillator having a third input configured to receive the BPSK signal and a fourth input configured to receive a second frequency reference. Further, the receiver includes a first phase-locked loop coupled with the second input of the first injection-locked oscillator. The first phase-locked loop is configured to generate the first frequency reference. And, a second phase-locked loop is coupled with the fourth input of the second injection-locked oscillator. The second phase-locked loop is configured to generate the second frequency reference.
    Type: Grant
    Filed: September 23, 2013
    Date of Patent: April 22, 2014
    Assignee: Innophase Inc.
    Inventor: Yang Xu
  • Patent number: 8665014
    Abstract: An I/Q demodulation apparatus and method with phase scanning are provided. The demodulation apparatus includes a ring oscillator, a first latch unit, a decoding unit, a counter unit, a second latch unit, a first arithmetical unit and a second arithmetical unit. The first latch unit samples phase signals outputted from the ring oscillator. The decoding unit decodes the output of the first latch unit to correspondingly generate fine code of a first, a second, a third and a fourth codes. The counter unit counts the phase signals. The second latch unit samples the output of the counter unit to correspondingly generate coarse code of the first, the second, the third and the fourth codes. The first arithmetical unit performs an addition/subtraction operation by using the first code and the second code. The second arithmetical unit performs the addition/subtraction operation by using the third code and the fourth code.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: March 4, 2014
    Assignee: Industrial Technology Research Institute
    Inventors: Huan-Ke Chiu, Jia-Hung Peng
  • Patent number: 8660203
    Abstract: Modern coding and modulation techniques have greatly improved the transmission and reception of signals. A method is described including receiving a signal de-mapping the signal into a first and second substream, decoding the first and second substream using a low density parity check decoding process, and combining the first and second decoded substream into a single data stream. An apparatus is described including a symbol de-mapper that receives a signal de-maps the modulation symbols in the signal into a first and second substream, a first decoder that decodes the first substream using a low density parity check coding process at a first decoding rate, a second decoder that decodes the second substream at a second encoding rate, and a combiner that combines the first substream and the second substream into a single data stream.
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: February 25, 2014
    Assignee: Thomson Licensing
    Inventors: Wei Zhou, Li Zou, Yuping Zhao, Xiaoxin Zhang, Peng Liu, Charles Chuanming Wang
  • Patent number: 8654880
    Abstract: Modern coding and modulation techniques have greatly improved the transmission of signals. A method is described including receiving a stream of data bits, demultiplexing the stream into a first and second substream, encoding the first and second substream using a low density parity check coding process, and mapping the first substream to a first region of a symbol constellation map and the second substream to a second region. Also, an apparatus is described including a demultiplexer that produces a first and second bitstream, a first encoder that encodes the first substream using a low density parity check coding process at a first encoding rate, a second encoder that encodes the second substream at a second rate, and a symbol mapper that maps bits from the first substream to a first region of a symbol constellation map and maps bits from the second substream to a second region.
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: February 18, 2014
    Assignee: Thomson Licensing
    Inventors: Wei Zhou, Li Zou, Yuping Zhao, Xiaoxin Zhang, Peng Liu, Charles Chuanming Wang
  • Patent number: 8644426
    Abstract: A robust differential receiver is described that may be used in any frequency modulated system, including short-range radio frequency (RF) communication devices. The differential receiver provides a preamble detection approach that reduces false preamble detection, a fine carrier frequency (CFO) estimation approach that provides an extended estimation range, and robust in-band and out-of-band interference detection. The described differential receiver assures that preamble detections are not falsely triggered, and that CFO estimates are based on accurately modeled preamble waveforms that have not been distorted by phase ambiguities or in-band distortion.
    Type: Grant
    Filed: July 7, 2009
    Date of Patent: February 4, 2014
    Assignee: Marvell International Ltd.
    Inventors: Quan Zhou, Songping Wu, Hui-Ling Lou
  • Patent number: 8644424
    Abstract: A receiver apparatus receiving a quadrature-modulated, modulated wave, includes: a real-zero signal generator for adding a sinusoidal wave to the modulated wave to generate a real-zero signal; an in-phase and quadrature component detector for extracting an in-phase component signal and a quadrature component signal from the real-zero signal; a real-zero sequence generator for generating a real-zero sequence as a sequence of time points at which the in-phase component and quadrature component signals become zero; and a signal reconstruction unit for reproducing the in-phase component and quadrature component from the real-zero sequence. It is possible to provide a receiving apparatus that enables decoding of a received signal with high precision even when sufficient linearity cannot be secured in the analog circuit of the receiver apparatus.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: February 4, 2014
    Assignees: Sharp Kabushiki Kaisha
    Inventors: Takashi Yoshimoto, Minoru Kubota, Naoki Okamoto, Hiroshi Suzuki, Kazuhiko Fukawa, Satoshi Suyama
  • Patent number: 8619924
    Abstract: A circuit, use, and method for controlling a receiver circuit is provided, wherein a complex baseband signal is generated from a received signal, a phase difference between a phase of the complex baseband signal and a phase precalculated from previous sampled values is determined, the phase difference is compared with a first threshold, a number is determined by counting the exceedances of the first threshold by the phase difference, a number of the counted exceedances is compared with a second threshold, and the receiver circuit is turned off if the number of counted exceedances exceeds the second threshold within a time period.
    Type: Grant
    Filed: February 23, 2010
    Date of Patent: December 31, 2013
    Assignee: Atmel Corporation
    Inventors: Ulrich Grosskinsky, Werner Blatz
  • Patent number: 8588344
    Abstract: A system and method for determining the modulation type and constellation order of an input signal given that the modulation type and constellation order are known to belong to set of possible types/orders. A computer operates on samples of the input signal to compute signal features. The computer classifies the modulation type and the constellation order by comparing each feature to one or more corresponding threshold values. The results of the comparisons are used to determine the modulation type and constellation order of the input signal from the set of possible types/orders. The classification may be performed based on a decision tree, each leaf node of the decision tree corresponding to a type/order combination, and each non-leaf node corresponding to one or more of the comparisons. The set of possible types/order may include PSK with a number of different constellation orders and QAM with a number of different constellation orders.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: November 19, 2013
    Assignee: National Instruments Corporation
    Inventors: Baijayanta Ray, Abhay Samant
  • Patent number: 8576954
    Abstract: Briefly, a method and apparatus to calculate cross-correlation values of complex binary sequences are provided. The apparatus may include a transformation unit and a cross-correlator. The cross-correlator may include a cross-correlation controller to provide, based on a type bit and a sign bit, a real component and/or an imaginary component of signals of complex binary sequences to a real accumulator and/or to an imaginary accumulator.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: November 5, 2013
    Assignee: Marvell World Trade Ltd.
    Inventors: Kobby Pick, Yona Perets
  • Patent number: RE45443
    Abstract: A radio receiver comprising: an antenna for receiving a radio frequency signal amplitude modulated with an audio frequency signal; a digitizer for periodically sampling the radio frequency signal and generating a digital reception signal representative of the amplitude of the radio frequency signal; and a demodulator for demodulating the digital reception signal to generate a representation of the audio frequency signal.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: March 31, 2015
    Assignee: GS IP, Limited Liability Company
    Inventors: Morgan James Colmer, Martin John Brennan