Carrier Recovery Circuit Or Carrier Tracking Patents (Class 375/326)
  • Patent number: 10637704
    Abstract: The systems and methods disclosed herein are generally directed to the real-time symbol rate of modulation modification based on noise and interference detection on a received signal during data transmission across a network. In one embodiment, a receiving device can measure the power of affected carriers, subcarriers, and/or tones. In one embodiment, adaptive bit loading can be used such that a lower order modulation scheme can be used to overcome through the noise and increase the Signal-to-noise ratio (SNR) of the transmitted signal. In one embodiment, more throughput (for example, more bps/Hz) can be achieved in the network by using subcarriers that have a higher SNR. Further, the bit-loading can serve to maximize the data rate subject to power and bit-error ratio (BER) constraints of the network.
    Type: Grant
    Filed: July 17, 2017
    Date of Patent: April 28, 2020
    Assignee: COX COMMUNICATIONS, INC.
    Inventor: Jeffrey L. Finkelstein
  • Patent number: 10598776
    Abstract: An electronic device includes a clock generating circuit, a receiving circuit and a training circuit. The clock generating circuit generates a sampling clock signal, a phase-early sampling clock signal and a phase-late sampling clock signal. The receiving circuit samples received data according to the sampling clock signal, the phase-early sampling clock signal and the phase-late sampling clock signal to generate a sample result. The training circuit controls the clock generating circuit to generate the sampling clock signal and the corresponding phase-early sampling clock signal and phase-late sampling clock signal that have different phases in a plurality of different time intervals, respectively, to cause the receiving circuit to generate a plurality of sample results. The training circuit further determines a sampling phase of the sampling clock signal according to the sample results.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: March 24, 2020
    Assignee: MEDIATEK INC.
    Inventors: Ming-Han Weng, Wei-Yung Wang, Chih-Hung Lin, Jyun Yang Shih, Chun-Chia Chen
  • Patent number: 10560128
    Abstract: Provided are a radio-frequency integrated chip (RFIC) and a wireless communication device including the RFIC. An RFIC configured to receive a carrier aggregated receive signal having at least first and second carrier signals may include first and second carrier receivers configured to generate, from the receive signal, first and second digital carrier signals, respectively. A phase-locked loop (PLL) may output a first frequency signal having a first frequency to the first carrier receiver and the second carrier receiver. The first and second carrier receivers may include first and second analog mixers, respectively, for translating frequencies of the receive signal, using the first frequency signal and the second frequency signal, respectively. Each of the first and second carrier receivers may further include a digital mixer for farther translating the frequencies of the receive signal in the digital domain.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: February 11, 2020
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Seung-hyun Oh, Chilun Lo, Barosaim Sung, Jae-hoon Lee, Jong-woo Lee
  • Patent number: 10560199
    Abstract: A signal processing circuit includes: a processor configured to adjust phases of reception samples which is supplied at a supply interval, according to a phase adjustment amount; and a processing circuit including a finite impulse response (FIR) filter with taps and configured to process, by the FIR filter, each of the reception samples and output output symbols at an output interval different from the supply interval, the processor is configured to: derive initial values of tap coefficients for the respective taps; and derive the phase adjustment amount such that a center of centroids of the tap coefficients at respective output time points of the output symbols coincides with a center of a number of taps of the FIR filter, the tap coefficients at respective output time points of the output symbols being set according to a deviation between the supply interval and the output interval and the initial values.
    Type: Grant
    Filed: January 24, 2019
    Date of Patent: February 11, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Yuya Imoto, Kazuhiko Hatae, Nobukazu Koizumi, Yasuo Ohtomo, Masato Oota, Masashi Sato, Daisuke Sasaki
  • Patent number: 10554355
    Abstract: Embodiments of a station (STA) and method for communication in accordance with phase noise compensation are generally described herein. The STA may determine, based at least partly on one or more operational parameters, whether to perform phase noise compensation of data symbols of a received protocol data unit (PDU). For instance, the STA may compare the operational parameters with one or more thresholds. The STA may further determine a method of phase noise compensation based at least partly on one or more operational parameters. As an example, the STA may determine a type of interpolation to be used for an interpolation of phase noise estimates of pilot symbols to determine phase noise estimates of data symbols. Example operational parameters may include a signal quality metric, a carrier frequency offset (CFO) measurement and/or modulation and coding scheme (MCS).
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: February 4, 2020
    Assignee: Apple Inc.
    Inventors: Claudio Da Silva, Hosein Nikopour, Wook Bong Lee
  • Patent number: 10505768
    Abstract: An apparatus in a signal receiver, such as an optical signal receiver, is provided. An adaptive equalizer provides an equalized output indicative of a received signal. A feedback component receives the equalized output and provides feedback to the adaptive equalizer. A carrier recovery component receives the equalized output from the adaptive equalizer provides estimates of symbols. The carrier recovery component is partially or fully disjoint from the feedback component, thus removing the carrier recovery component from equalizer the feedback loop. The feedback component can include an initial carrier recovery component and a phase rotation and detection component. The initial carrier recovery component generates a carrier recovery output based on the equalized output. The phase rotation and detection component performs a phase rotation based on the carrier recovery output.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: December 10, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Nash'at Abughalieh, Syed Faisal Ali Shah, Chuandong Li
  • Patent number: 10382190
    Abstract: A desirable feature of a SERDES design is power savings. One way to achieve power savings is by keeping the CDR circuit OFF during most of the time when a link is active between a transmitter and a receiver. However, due to voltage supply noise, temperature fluctuations and uncorrelated crosstalk, the receiver data may shift and/or the eye may collapse if the CDR is not turned ON to take care of these modulations. To address such disadvantages, it is proposed to generate a CDR profile that can specify optimum CDR ON and OFF time so that link stability may be maintained while saving power.
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: August 13, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Rajeev Sharma, Santhosh Kumar Gude, Parth Patel, Hadi Goudarzi, Eskinder Hailu
  • Patent number: 10355889
    Abstract: Systems and methods disclosed herein provide for adaptively applying pattern filters so that the edges are discarded only when the DFE feedback has adapted to levels that can corrupt the timing recovery. Embodiments of the systems and methods provide for a phase detector that selectively suppresses timing information based on the logic level states of the Qp and Qm data samples associated with the received signal.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: July 16, 2019
    Assignee: CADENCE DESIGN SYSTEMS, INC.
    Inventors: Scott David Huss, Guillaume Fortin
  • Patent number: 10355894
    Abstract: Systems, methods and apparatus are described that facilitate transmission of data between two devices within an electronic apparatus. An apparatus has a bus interface, a 3-phase encoder, and a processing circuit that can configure the 3-phase encoder for a first mode of operation in which data is encoded in a sequence of two-bit symbols, transmit a first three-phase signal representative of the sequence of two-bit symbols on each of the three wires. The processing circuit may be configured to configure the 3-phase encoder for a second mode of operation in which data is encoded in a sequence of three-bit symbols. Three-phase signal representative of the sequence of two-bit symbols or sequence of three-bit symbols on each of three wires, where a three-phase signal is in a different phase on each wire when transmitted, and a transition in signaling state occurs between transmission of each pair of symbols.
    Type: Grant
    Filed: September 11, 2018
    Date of Patent: July 16, 2019
    Assignee: QUALCOMM Incorporated
    Inventor: George Alan Wiley
  • Patent number: 10348537
    Abstract: Apparatuses and methods for adding offset delays to signal lines of multi-level communication architectures are disclosed herein. An example method may include comparing a current channel state of a channel of a multi-level communication bus with a next channel state of the channel. The example method may further include, based on the comparison, applying an offset delay to a control signal configured to control transition of a signal line of the channel from a value associated with the current channel state to a value associated with the next channel state. The example method may further include after application of the offset delay, driving the signal line to the value associated with the next channel state responsive to the control signal.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: July 9, 2019
    Assignee: Micron Technology, Inc.
    Inventor: Bruce W. Schober
  • Patent number: 10306577
    Abstract: A method is disclosed for synchronization, comprising obtaining baseband signal samples of a baseband information signal having an in-phase signal sample and a quadrature signal sample, the baseband information signal having been generated by mixing a received modulated carrier signal with a local oscillator (LO) signal having an LO frequency, the modulated carrier signal being an in-phase signal and quadrature signal having a substantially uncorrelated nature and derived from different input data sets; determining an offset frequency rotation based on an estimated residual correlation between the in-phase signal samples and the quadrature signal samples; and, deriving synchronization information from the offset frequency rotation, wherein the received modulated carrier signal is a quadrature-modulated signal with arbitrary orthogonal in-phase and quadrature signal components.
    Type: Grant
    Filed: April 10, 2018
    Date of Patent: May 28, 2019
    Assignee: PhasorLab, Inc.
    Inventor: Joshua C. Park
  • Patent number: 10275079
    Abstract: According to an aspect, a display device with a touch detection function includes: a touch detector including first group electrodes extending in a first direction and second group electrodes extending in a second direction intersecting the first direction; a display unit that displays an image; a display controller that controls the display unit to display the image on the display unit; and a touch detection controller that detects contact or proximity of a detection target object based on mutual capacitances between the first and the second group electrodes. The touch detection controller measures a frame frequency that is a number of times frames are displayed per unit time, to sequentially output touch drive signals having a frequency corresponding to the frame frequency to the first group electrodes, and to detect the contact or proximity of the detection target object based on signals output from the respective second group electrodes.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: April 30, 2019
    Assignee: Japan Display Inc.
    Inventor: Shigeyuki Agematsu
  • Patent number: 10270456
    Abstract: An apparatus includes a phase interpolator configured to receive a four-phase signal and output a six-phase signal, and a summing network configured to receive the six-phase signal and output a two-phase signal, wherein: a first phase, a third phase, and a fifth phase of the six-phase signal are summed to generate a second phase of the two-phase signal, while a second phase, a fourth phase, and a sixth phase of the six-phase signal are summed to generate a first phase of the two-phase signal.
    Type: Grant
    Filed: January 2, 2018
    Date of Patent: April 23, 2019
    Assignee: REALTEK SEMICONDUCTOR CORP.
    Inventors: Chia-Liang (Leon) Lin, Wenbo Xu, Fei Song
  • Patent number: 10256845
    Abstract: A method for timing recovery for a high-speed data transmission system may be provided. The method comprises receiving an analog input signal at an ADC and passing processed digital signal samples to a Viterbi detector. The method also comprises receiving at least one processed signal sample and at least two sets of at least one candidate symbol each from the Viterbi detector and/or the processed signal samples by timing error detectors and forwarding output digital signals of the timing error detectors via loop filters to related multiplexers. Furthermore, the method comprises selecting one digital signal from each of the multiplexers using a select signal generated by the Viterbi detector, and deriving a control signal controlling a sampling clock of the analog-to-digital converter by at least one of the selected digital signals from the multiplexers.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: April 9, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Hazar Yüksel, Giovanni Cherubini, Roy Cideciyan, Simeon Furrer, Marcel Kossel
  • Patent number: 10218549
    Abstract: A post-equalization phase tracking unit, for each signal block of a received series: computes beginning absolute phase rotation using equalized preceding pilot symbols; subdivides the block into a time sequence of groups of equalized symbols; initializes accumulated phase associated with the first-in-time group with the absolute phase rotation. For each group, the unit: computes a de-rotated version of each symbol using the previous group's accumulated phase used to blindly estimate a residual group phase; assigns the group's accumulated phase with a sum of the group's residual phase and the previous group's accumulated phase; estimates phase drift within the group by using at least the group's accumulated phase to compute a phase compensation signal.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: February 26, 2019
    Assignee: National Instruments Corporation
    Inventors: Michael Löhning, Eckhard Ohlmer
  • Patent number: 10193716
    Abstract: Methods and systems are described for generating two comparator outputs by comparing a received signal to a first threshold and a second threshold according to a sampling clock, the first and second thresholds determined by an estimated amount of inter-symbol interference on a multi-wire bus, selecting one of the two comparator outputs as a data decision, the selection based on at least one prior data decision, and selecting one of the two comparator outputs as a phase-error indication, the phase error indication selected in response to identification of a predetermined data decision pattern.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: January 29, 2019
    Assignee: KANDOU LABS, S.A.
    Inventors: Ali Hormati, Richard Simpson
  • Patent number: 10177941
    Abstract: Provided are a method and apparatus for estimating and correcting the phase error in 5G or pre-5G communication systems providing much higher data rates compared to existing 4G communication systems including LTE systems. The existing phase error estimation scheme using a cyclic prefix in the time domain may fail to prevent performance degradation due to inter-carrier interference. In the present invention, it is possible to enhance reception performance of the receiver by estimating and correcting the phase error multiple times within a symbol using a time domain signal and by reducing the influence of inter-carrier interference.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: January 8, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jongho Oh, Hyoungjin Lim, Jaewon Kim, Hyunkyu Yu, Hyunil Yoo, Kyungwhoon Cheun, Jisung Oh, Kilsik Ha
  • Patent number: 10104621
    Abstract: Systems and methods are provided for packet detection in a wireless local area network transceiver. An antenna is configured to receive a signal, having a carrier frequency. A mixer is configured to mix the received signal with one of the in-phase and quadrature components of the local oscillator to produce a corresponding one of an in-phase downconverted signal and a quadrature phase downconverted signal. A packet detector is configured to determine, from the one of the in-phase downconverted signal and the quadrature phase downconverted signal, if the signal contains a packet of data and instruct a set of components associated with an other of the in-phase and quadrature components of the local oscillator to activate to process the received signal.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: October 16, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Raghu Ganesan, Karthik Ramasubramanian, Sarma S. Gunturi
  • Patent number: 10084622
    Abstract: The embodiment of the disclosure discloses a method and device for eliminating Inter-Carrier Interference (ICI) and a computer storage medium. The method for eliminating the ICI includes that: a user frequency offset value is acquired; an order of a filter is determined according to the user frequency offset value; a filter coefficient is constructed according to the order of the filter; user carrier data is received; and ICI elimination is performed on a target subcarrier according to frequency-domain data on adjacent subcarriers of the target subcarrier and filter coefficients of corresponding positions of the adjacent subcarriers, wherein the target subcarrier is any carrier in the user carrier data.
    Type: Grant
    Filed: November 28, 2014
    Date of Patent: September 25, 2018
    Assignee: ZTE Corporation
    Inventor: Jidong Wei
  • Patent number: 9998126
    Abstract: Aspects of the disclosure are directed to generating a quadrature clock signal from an in-phase clock signal. In accordance with one aspect, a delay locked loop (DLL), including a first pulse to digital converter (PDC) to generate a first pulse width measurement, wherein the first pulse width measurement includes a first sign and a first magnitude; a second pulse to digital converter (PDC) to generate a second pulse width measurement, wherein the second pulse width measurement includes a second sign and a second magnitude; a digital loop filter coupled to the first PDC and the second PDC, the digital loop filter to generate a filtered comparison output based on the first pulse width measurement and the second pulse width measurement; and a first delay generation block to generate a quadrature clock signal based on the filtered comparison output and an in-phase clock signal.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: June 12, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Eskinder Hailu, Bupesh Pandita
  • Patent number: 9960857
    Abstract: Described herein are systems and methods for accurately estimating and removing a carrier frequency offset. One exemplary embodiment relates to a system comprising a frequency offset detection circuit detecting a carrier frequency offset in an optical signal, and a frequency testing circuit calculating an estimated frequency offset value of the carrier frequency offset, wherein the frequency testing circuit removes a carrier phase based on the estimated frequency offset value and recovers the optical signal. Another exemplary embodiment relates to a method comprising detecting a carrier frequency offset in an optical signal, calculating an estimated frequency offset value of the carrier frequency offset, removing a carrier phase based on the estimated frequency offset value, and recovering the optical signal.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: May 1, 2018
    Assignee: AT & T INTELLECTUAL PROPERTY I, L.P.
    Inventor: Xiang Zhou
  • Patent number: 9948415
    Abstract: A method for processing a plurality of signals may include receiving one or more observations characterizing a wireless channel, performing a channel estimation to determine a probabilistic channel model for the wireless channel, and processing the plurality of signals using the probabilistic channel model. The channel estimation may include numerically updating one or more multipath gain estimates and one or more multipath delay estimates based on the one or more received observations and a probability distribution associated with the probabilistic channel model.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: April 17, 2018
    Assignee: INTEL IP CORPORATION
    Inventors: Mihai-Alin Badiu, Guillaume Monghal, Bernard Fleury, Christian Rom
  • Patent number: 9914551
    Abstract: Embodiments described herein provide for passive timing of asynchronous Inertial Measurement Unit (IMU) attitude data using information derived from a pattern of skipped and duplicate samples of attitude data generated by the IMU. One embodiment is an attitude controller for a vehicle that generates samples of attitude data at a first frequency (f1) from an IMU of the vehicle. The IMU updates the attitude data at a second frequency (f2). Each update of the attitude data includes a time stamp. The attitude controller is processes time stamps in the samples to identify a pattern of at least one of a skipped sample of an update to the attitude data and a duplicate sample of an update to the attitude data. The attitude controller estimates lag times between updates of the attitude data and samples of the attitude data based on the pattern and a relationship between f1 and f2.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: March 13, 2018
    Assignee: The Boeing Company
    Inventors: Adam Honse, Richard A. Fowell
  • Patent number: 9918113
    Abstract: A digital broadcasting system and a method of processing data are disclosed. Herein, additional encoding is performed on mobile service data, which are then transmitted, thereby providing robustness in the processed mobile service data, so that the mobile service data can respond more strongly against fast and frequent channel changes. In a transmitting system including a service multiplexer and a transmitter located in a remote site, a method of processing data of the transmitting system includes comparing an output data rate of the service multiplexer and a transmission data rate of the transmitter, when a difference occurs between the two data rates, adjusting a burst size, wherein the burst transmits mobile service data, and encoding the mobile service data, and referring to the burst size so as to multiplex main service data and the encoded mobile service data in a burst structure.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: March 13, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Hyoung Gon Lee, In Hwan Choi, Kook Yeon Kwak, Jong Moon Kim, Won Gyu Song, Byoung Gill Kim, Jin Woo Kim
  • Patent number: 9912272
    Abstract: According to one embodiment, there is provided a control device of a secondary excitation device which supplies a rotary machine with a voltage or current of a variable frequency. The control device includes a harmonic frequency calculation unit which calculates a frequency of a specific harmonic generated on a primary side of the rotary machine by using a slip frequency or rotation speed of the rotary machine and a carrier frequency of the secondary excitation device, and a carrier frequency correction unit which corrects the carrier frequency of the secondary excitation device such that the frequency of the specific harmonic calculated by the harmonic frequency calculation unit falls within a given band.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: March 6, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ryan Triadhitama Bin Marwan Awaloeddin, Kiyoshi Kusunoki, Kentaro Kinoshita, Hiroyuki Kikuchi
  • Patent number: 9883227
    Abstract: A television signal processing circuit includes an audio/video (AV) signal generating circuit, an intermediate frequency (IF) mixer, a first filter, a radio-frequency (RF) mixer, a second filter and a digital-to-analog converter (DAC). The AV signal generator generates a digital AV signal. The IF mixer converts the digital AV signal to an IF AV signal. The first filter filters the IF AV signal to generate a filtered IF AV signal. The RF mixer converts the filtered IF AV signal to an RF AV signal. The second filter filters the RF AV signal to generate a filtered RF AV signal. The DAC converts the filtered RF AV signal to an analog AV signal and transmits the analog AV signal to an antenna.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: January 30, 2018
    Assignee: MSTAR SEMICONDUCTOR, INC.
    Inventors: Ching-Fu Lan, Ying-Chao Chou, Chih-Ching Chao, Huang-Hsiang Lin, Jung-Kuei Chang
  • Patent number: 9831975
    Abstract: A non-data-aided method of calculating an estimate of the sampling frequency offset (SFO) in a digital receiver involves performing a plurality of correlations between two identical sized groups of samples within a received signal where the spacing of the groups is varied for each correlation. In various examples the number of samples in the groups is also varied. For larger symbols, the group of samples may comprise approximately the same number of samples as the guard interval in a symbol and for smaller symbols, the group of samples may comprise approximately the same number of samples as an entire symbol. An estimate of the SFO is determined by identifying the largest correlation result obtained from all the correlations performed. The largest correlation result indicates the largest correlation.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: November 28, 2017
    Assignee: Imagination Technologies Limited
    Inventors: Paul Murrin, Bastien Beauvois, Nitzan Tzifroni
  • Patent number: 9832011
    Abstract: Performance indicator circuitry is provided for characterizing performance of a phase locked loop (PLL) in a phase path of a polar modulator or polar transmitter that is used to generate a phase modulated RF signal. The PLL includes an oscillator, a high pass path, and a low pass path. The low pass path includes a loop filter. The performance indicator circuitry includes first input circuitry and parameter calculation circuitry. The first input circuitry is configured to input a loop filter signal from the loop filter. The parameter calculation circuitry is configured to compute a value for a performance indicator based on the loop filter signal and control or characterize an aspect of operation of the PLL based on the value.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: November 28, 2017
    Assignee: Intel IP Corporation
    Inventors: Christian Wicpalek, Tobias Buckel, Andreas Menkhoff
  • Patent number: 9802497
    Abstract: An electric power transmission device includes an electric power transmission portion, a first communication portion, and a first control device controlling the electric power transmission portion and the first communication portion. A vehicle includes an electric power reception portion, a second communication portion, and a second control device controlling the electric power reception portion and the second communication portion. The first control device and the second control device determine whether or not to cause the electric power transmission portion to transmit electric power based on an instruction from a user which is provided after the user is notified of a status of electric power reception in the electric power reception portion or an estimated status of electric power reception in the electric power reception portion.
    Type: Grant
    Filed: November 24, 2011
    Date of Patent: October 31, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Shinji Ichikawa
  • Patent number: 9762379
    Abstract: We disclose an optical receiver for direct detection of an intensity-modulated optical signal, the digital signal processor of which employs a clock-recovery circuit capable of reliably recovering the internal clock of the received optical signal without relying on dispersion-compensation processing even if the signal's eye pattern is substantially closed. In an example embodiment, the clock-recovery circuit comprises a frequency-domain phase detector that operates to determine and track in time the sampling phase using only a subset of the digital spectral components corresponding to the received optical signal. The determined sampling phase is then used to synchronize the digital electrical samples of the received optical signal with the internal clock thereof by way of digital interpolation or through appropriate control of the sampling frequency and phase of the receiver's analog-to-digital converter.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: September 12, 2017
    Assignee: Alcatel-Lucent USA Inc.
    Inventor: Noriaki Kaneda
  • Patent number: 9722768
    Abstract: A carrier recovery unit is provided including: separation-and-output section that outputs separated symbol group formed into block; a priori state-estimation section that obtains a priori estimate acquired by estimating values processed this time from among values of intra-block frequency and central phase processed last time; provisional compensation section that provisionally compensates the phase of each separated symbol based on the a priori estimation phase; decision section that performs decision based on the reference signal for the symbol before decision, and obtains symbol after decision; error-estimation section that calculates the frequency and phase errors; a posteriori state-estimation section that obtains a posteriori estimate based on the frequency and phase errors; actual compensation section that actually compensates the phase based on the a posteriori estimation phase; and feedback processing section that feeds back the a posteriori estimate as the values processed last time to the a priori
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: August 1, 2017
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventor: Takashi Inoue
  • Patent number: 9722847
    Abstract: A preamble generating unit generates first and second synchronization preambles having different numbers of subcarriers. A transmission signal generating unit generates an OFDM transmission signal through time-division multiplexing by using the generated first and second synchronization preambles. A transmission RF unit converts the generated OFDM transmission signal into a radio-frequency OFDM signal and transmits the radio-frequency OFDM signal. The preamble generating unit adds a predetermined dummy period between the first synchronization preamble and the second synchronization preamble.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: August 1, 2017
    Assignee: PANASONIC CORPORATION
    Inventors: Ippei Kanno, Yoshinobu Matsumura, Teruaki Hasegawa, Shigeru Soga, Kouya Watanabe, Hisateru Kobatake, Kenichi Mori, Yoshio Urabe
  • Patent number: 9712370
    Abstract: A signal receiving apparatus receives a radio frequency signal sent by a signal transmitting apparatus, where the radio frequency signal includes a transmit end image component. The signal receiving apparatus generates a receive end image component after performing down-conversion processing on the radio frequency signal. The signal receiving apparatus separately removes the receive end image component and the transmit end image component by performing quadrature modulation compensation twice.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: July 18, 2017
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Guofei Yun, Hunter Wang, Jianxiong Bai
  • Patent number: 9692568
    Abstract: A device, a method, a mobile station and a non-transitory computer-readable digital storage medium are provided. The device comprises a quadrant classification unit to classify a plurality of symbols in an input shared channel signal into a plurality of quadrants in a complex plane, an energy determination unit to determine a real part energy and an imaginary part energy for the plurality of symbols in each of the plurality of quadrants respectively, an energy summing unit to determine a real part energy sum EI and an imaginary part energy sum EQ by summing the real part energy and the imaginary part energy for the plurality of quadrants respectively, and an estimation unit to estimate a SubChannel Power Imbalance Ratio (SCPIR) of the input shared channel signal the real part energy sum EI and the imaginary part energy sum EQ.
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: June 27, 2017
    Assignee: Intel Deutschland GmbH
    Inventor: Hong Zhang
  • Patent number: 9678146
    Abstract: The present invention discloses a temperature insensitive testing device comprising: a transmission-end test sequence generating circuit to generate a test sequence; a transmission circuit to process the test sequence according to a transmission clock and thereby generate a test signal; a reception circuit to process an echo of the test signal and generate a digital echo signal; a correlation-value generating circuit to generate correlation values including a maximum correlation value according to the test sequence and the digital echo signal; and a decision circuit to determine whether a relation between the maximum correlation value and at least one threshold satisfies a predetermined condition and thereby generate a decision result, wherein the frequency of the transmission clock is lower than a predetermined frequency which confines the variation of the maximum correlation value to a predetermined range provided that the temperature variation of the transmission cable is within a temperature variation ran
    Type: Grant
    Filed: November 3, 2014
    Date of Patent: June 13, 2017
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Ching-Yao Su, Liang-Wei Huang, Shih-Wei Wang, Sheng-Fu Chuang
  • Patent number: 9673829
    Abstract: Wideband polar receivers and method of operation are described. A phase-modulated input signal is received at a polar receiver that includes an injection-locked oscillator. The injection-locked oscillator includes a plurality of injection points. Based on the frequency of the input signal, a particular Nth harmonic is selected, and the input signal is injected at the set of injection points corresponding to the selected Nth harmonic. The injection-locked oscillator generates an oscillator output signal, and the phase of the input signal is determined from the phase of the oscillator output signal. In some embodiments, the oscillator output signal is frequency-multiplied by N, mixed with the input signal, and filtered for use in amplitude detection. The input signal is decoded based on the phase and amplitude information.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: June 6, 2017
    Assignee: INNOPHASE, INC.
    Inventors: Yang Xu, Sara Munoz Hermoso, Roc Berenguer Perez
  • Patent number: 9667350
    Abstract: The optical receiving device with phase compensation apparatus uses coherent opto-electric conversion and is designed for receiving phase- or quadrature-amplitude-modulated optical signals. The phase compensation apparatus includes following elements: a carrier-phase estimation unit that estimates carrier phase errors in a received symbol string; a gain adjustment unit that adjusts weighting of each symbols in phase error evaluation performed in the carrier-phase adjustment unit; a phase-cycle-slip reduction unit with a phase-cycle-slip detector using statistical processing performed on the output symbols from the carrier-phase estimation unit; and a phase compensation circuit that compensates carrier phase errors of the received signal using an output from the carrier phase estimation unit.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: May 30, 2017
    Assignee: Nippon Telegraph And Telephone Corporation
    Inventors: Kengo Horikoshi, Kohki Shibahara, Etsushi Yamazaki, Mitsuteru Yoshida, Koichi Ishihara, Takayuki Kobayashi, Yoshiaki Kisaka, Takuya Ohara, Masahito Tomizawa, Tomoyoshi Kataoka
  • Patent number: 9654278
    Abstract: A data processing device includes a signal processing unit that performs timing recovery of sampling timing, in such a manner that a sampled value is obtained at sampling timing which is set as a target by phase interpolation processing according to a feed-forward control, with respect to sampling data which is obtained from a recovery signal.
    Type: Grant
    Filed: January 5, 2015
    Date of Patent: May 16, 2017
    Assignee: Sony Corporation
    Inventors: Satoru Higashino, Junya Shiraishi
  • Patent number: 9635634
    Abstract: A method comprising generating a baseband information signal by mixing a received modulated carrier signal with a local oscillator (LO) signal having an LO frequency; obtaining baseband signal samples of the baseband information signal having a baseband signal magnitude and a baseband signal phase; determining a cumulative phase measurement associated with baseband signal samples having a baseband signal magnitude greater than a threshold; and, applying a correction signal to compensate for an LO frequency offset of the LO frequency based on the cumulative phase.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: April 25, 2017
    Assignee: PhasorLab, Inc.
    Inventor: Joshua C. Park
  • Patent number: 9635520
    Abstract: A method and an apparatus for receiving broadcast signals thereof are disclosed. The apparatus for receiving broadcast signals, the apparatus comprises a receiver to receive the broadcast signals, a demodulator to demodulate the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplex) scheme, a frame parser to parse signal frames from the demodulated broadcast signals, a MIMO (Multi Input Multi Output) processor to process service data in the parsed signal frames based on a rotation matrix with a rotation angle, a demapper to demap the MIMO processed service data and a decoder to decode the demapped service data.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: April 25, 2017
    Assignee: LG Electronics Inc.
    Inventors: Jinyong Choi, Woosuk Ko, Sangchul Moon, Sungryong Hong
  • Patent number: 9595988
    Abstract: A communication device is described comprising a plurality of receive paths, wherein each of the plurality of receive paths is configured to extract a multipath component of a received signal, a determiner configured to determine whether at least two of the plurality of receive paths fulfil a mutual interference correlation criterion among the plurality of receive paths and a processor configured, if at least two of the plurality of receive paths fulfil the interference correlation criterion among the plurality of receive paths, to determine the sent signal based on canceling or mitigating the interference between the multipath components of the received signal extracted by the at least two receive paths.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: March 14, 2017
    Assignee: INTEL CORPORATION
    Inventors: Umer Salim, Markus Jordan, Tobias Scholand, Jean-Xavier Canonici, Michael Speth
  • Patent number: 9549383
    Abstract: The present application discloses a system and a method for clock synchronization of base stations. In the system for clock synchronization of base stations, a Global Positioning System (GPS) receiver on a main control board of a base station is connected to a GPS antenna feeder; the GPS receiver connected to the GPS antenna feeder is connected to a Phase-Locked Loop (PLL) on the present main control board and a PLL on other main control board; the main control boards are connected through a judgment line.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: January 17, 2017
    Assignee: DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD.
    Inventors: Qiang Ma, Zhicong Han, Li Xu, Xiangu Xiao
  • Patent number: 9520987
    Abstract: A method for inductively-coupled communications is described. The method includes receiving a signal. The method also includes analyzing the signal to estimate a symbol timing error. Estimating the symbol timing error may include comparing a location of a pause, a low-to-high or a high-to-low transition in the received signal with an ideal location of a pause or a transition. The method further includes adjusting symbol timing to correct for the symbol timing error.
    Type: Grant
    Filed: February 23, 2015
    Date of Patent: December 13, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Eunmo Kang, Le Nguyen Luong, Koorosh Akhavan, Rajapaksa Senaratne, Thomas Cargill
  • Patent number: 9491010
    Abstract: A group of data symbols for a current block of data symbols in multiple blocks received over a communication channel is equalized, based on a pilot block, to generate a group of equalized symbols. The group of equalized symbols is de-rotated as a function of a current phase estimate to determine initial de-rotated equalized symbols. The phase estimate is an estimate of phase caused by noise for blocks previous to the current block. Additionally, a phase metric is calculated from real and imaginary parts of the initial de-rotated equalized symbols, wherein the phase metric estimates phase caused by noise for the current block. The current phase estimate is updated with the phase metric. The initial de-rotated equalized symbols are de-rotated by the phase metric to determine final equalized and de-rotated symbol estimates. The final equalized and de-rotated symbol estimates are output. Apparatus, methods, and computer program products are disclosed.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: November 8, 2016
    Assignee: Nokia Solutions and Networks Oy
    Inventors: Timothy Thomas, Mark Cudak
  • Patent number: 9473291
    Abstract: Described are apparatuses and methods for reducing channel physical layer (C-PHY) switching jitter. An apparatus may include a pattern dependent delay circuit to detect a switching pattern of at least three data signals on respective wires and adaptively change delays of the at least three data signals based on the switching pattern. The apparatus may further include a transmitter, coupled to the pattern dependent delay circuit, to transmit the at least three data signals.
    Type: Grant
    Filed: July 8, 2014
    Date of Patent: October 18, 2016
    Assignee: Intel Corporation
    Inventor: Jonggab Kil
  • Patent number: 9450715
    Abstract: A system for carrier phase recovery, including a receiver for receiving one or more frames of L symbols. A phase estimator performs carrier phase estimation for the received frames of L symbols, and the resulting carrier phase estimates are stored in a non-transitory computer-readable storage medium. One or more rotators de-rotates the received frames of L symbols by one or more of the carrier phase estimates, and a data processor calculates a sum of the outputs of the L de-rotated signals raised to an nth power, and determines a real part of the sum. A minimum determination device determines a minimum of the real part of the sum with respect to the carrier phase estimates, and phase unwrapping and multiplier removal is performed if a minimum has been determined.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: September 20, 2016
    Assignee: NEC Corporation
    Inventors: Shaoliang Zhang, Fatih Yaman, Yoshihisa Inada
  • Patent number: 9450871
    Abstract: A digital broadcasting system and a method of processing data are disclosed. Herein, additional encoding is performed on mobile service data, which are then transmitted, thereby providing robustness in the processed mobile service data, so that the mobile service data can respond more strongly against fast and frequent channel changes. In a transmitting system including a service multiplexer and a transmitter located in a remote site, a method of processing data of the transmitting system includes comparing an output data rate of the service multiplexer and a transmission data rate of the transmitter, when a difference occurs between the two data rates, adjusting a burst size, wherein the burst transmits mobile service data, and encoding the mobile service data, and referring to the burst size so as to multiplex main service data and the encoded mobile service data in a burst structure.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: September 20, 2016
    Assignee: LG ELECTRONICS INC.
    Inventors: Hyoung Gon Lee, In Hwan Choi, Kook Yeon Kwak, Jong Moon Kim, Won Gyu Song, Byoung Gill Kim, Jin Woo Kim
  • Patent number: 9350487
    Abstract: In an example, there is disclosed a system and method for detecting and correcting error in a quadrature receiver (QR). The QR may include a receiver channel operable to divide a received RF signal into I and Q channels. The receiver channel may include error sources, such as (in sequence) pre-demodulation (PD) error, LO mixer error, and baseband (BB) error. Test tones may be driven on the receiver channel at a plurality of test frequencies, and a quadrature error corrector may be provided to detect error from each source. Upon receiving an RF signal, the quadrature error corrector may apply correction coefficients to correct each source of error in reverse sequence (BB, LO, PD).
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: May 24, 2016
    Assignee: Analog Devices, Inc.
    Inventors: Richard P. Schubert, Mariko Medlock, Wei An
  • Patent number: 9292123
    Abstract: A system and method for sample rate adaption. The system and method provide for information derived from sampling at a first rate to be applied or processed at a second rate where the first and second rates differ in frequency and phase. The information is adapted from the first rate to the second rate. Then phase differences including phase introduced as by-product of adapting the frequencies are reduced by phase adaption.
    Type: Grant
    Filed: February 15, 2013
    Date of Patent: March 22, 2016
    Assignee: 2236008 Ontario, Inc.
    Inventor: Patrick-Andre Savard
  • Patent number: 9270507
    Abstract: A system and method for detecting signal levels in a multi-level signaling receiver. In one embodiment, a plurality of comparators, each including a differential pair, such as a differential pair of field-effect transistors (FETs) are assembled in a stacked configuration so that in some states current flows through FETs of the plurality of differential pairs in series, resulting in a reduction in power consumption.
    Type: Grant
    Filed: January 23, 2014
    Date of Patent: February 23, 2016
    Assignee: Samsung Display Co., Ltd.
    Inventor: Mohammad Hekmat