Antinoise Or Distortion (includes Predistortion) Patents (Class 375/296)
  • Patent number: 10693695
    Abstract: A transmitter comprises a first peak-to-average-power ratio (PAPR) suppression circuit and a second peak-to-average-power ratio (PAPR) suppression circuit. The first PAPR suppression circuit may receive a first sequence of time-domain symbols to be transmitted, alter the first sequence based on each of a plurality of symbol ordering and/or inversion descriptors to generate a corresponding plurality of second sequences of time-domain symbols, measure a PAPR corresponding to each of the second sequences, select one of the plurality of symbol ordering and/or inversion descriptors based on the measurement of PAPR, and convey the selected one of the symbol ordering and/or inversion descriptors to the second PAPR suppression circuit. The second PAPR suppression circuit may receive the first sequence of time-domain symbols to be transmitted, and alter the first sequence based on the selected one of the symbol ordering and/or inversion descriptors to generate a reordered and/or inverted symbol sequence.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: June 23, 2020
    Assignee: MAXLINEAR, INC.
    Inventors: Curtis Ling, Tim Gallagher, Elad Shaked
  • Patent number: 10686477
    Abstract: A method for reducing or eliminating an interference signal includes: coupling a transmission signal transmitted from a transmission antenna of a communication device so as to obtain a reference signal; adjusting a power and a phase of the reference signal, superimposing a cancellation signal obtained by the adjusting with a received signal received by a reception antenna of the communication device, and coupling the obtained superposition signal so as to obtain an acquisition signal; and repeating the adjusting until a voltage value of the acquisition signal is smaller than or equal to a historical minimum voltage value, the received signal including a useful signal and an interference signal formed by the transmission signal at the reception antenna; and determining the obtained superposition signal as a received signal for eliminating interference of the receive antenna, the received signal for eliminating interference of the receive antenna including the useful signal.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: June 16, 2020
    Assignee: BEIJING XIAOMI MOBILE SOFTWARE CO., LTD.
    Inventor: Chaoxi Chen
  • Patent number: 10680664
    Abstract: A communication device including: a transmitter for providing a first radio frequency (RF) signal to a first antenna; a second antenna for receiving the first RF signal from the first antenna to produce a second RF signal; a receiver for receiving the second RF signal from the second antenna, wherein the receiver generates a feedback signal from the second RF signal; and a controller configured to control pre-distortion based on the feedback signal.
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: June 9, 2020
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hong-min Choi, Dae-young Kim, Joo-hyun Do, Young-ik Cho
  • Patent number: 10673475
    Abstract: The disclosure provides a transmitter of a communication system using hybrid digital/analog beamforming and configured to perform digital pre-distortion (DPD). In an exemplary embodiment in accordance with the disclosure, the transmitter may generate a plurality of scrambling sequences. The transmitter may comprise a plurality of combining modules to receive a combined feedback signal. The transmitter may use the plurality of scrambling sequences to recover the signals output by the antenna arrays from the combined feedback signal. Thus, the transmitter may perform DPD for each antenna array.
    Type: Grant
    Filed: October 14, 2019
    Date of Patent: June 2, 2020
    Assignee: Industrial Technology Research Institute
    Inventors: Wei-Cheng Zhuo, Wei-Min Lai, Jia-Ming Chen, Jen-Yuan Hsu
  • Patent number: 10666340
    Abstract: A split radio access network is provided that efficiently transmits beamforming coefficients from a distributed baseband unit device to a remote radio unit device to facilitate beamforming at the remote radio unit. The beamforming coefficients can be determined at the baseband unit device and transmitted along with the IQ data (data to be beamformed) to the remote radio unit device. Due to the large number of antenna ports however, there can still be a very large number of coefficients to transmit, and the disclosure provides for a compressed set of coefficients that reduces the overhead signaling requirements. Instead of sending coefficients for every kth antenna port, the system can select a subset of the coefficients corresponding to a set of k antenna ports which can be used by the remote radio unit to approximate the full set of beamforming coefficients.
    Type: Grant
    Filed: June 14, 2019
    Date of Patent: May 26, 2020
    Assignee: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: SaiRamesh Nammi, Aditya Chopra, Arunabha Ghosh, Milap Majmundar
  • Patent number: 10666341
    Abstract: A wireless communication device including a controller and a non-transitory machine-readable storage medium operatively coupled to the controller is provided. The controller executes program code stored in the non-transitory machine-readable storage medium to perform operations including: transmitting or receiving wireless signals by sweeping beams in a non-sequential order.
    Type: Grant
    Filed: February 12, 2018
    Date of Patent: May 26, 2020
    Assignee: MEDIATEK INC.
    Inventors: Chiou-Wei Tsai, Guo-Hao Gau, Cheng-Po Liang, Xiu-Sheng Li
  • Patent number: 10659138
    Abstract: Precoding is a technique that may be used in wireless communications when antenna spacing in a multiple-input multiple-output (MIMO) system is smaller than optimum spacing conditions. A precoding system and method are disclosed herein that distributes power among streams to trade-off increased data throughput and complexity of interference cancellation. Distributing power among streams may increase data throughput compared to singular value decomposition (SVD) precoding, but interference may be reduced compared to other methods that result in relatively high interference.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: May 19, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Hoda Shahmohammadian, Ming Jian
  • Patent number: 10651869
    Abstract: A radio frequency digital-to-analog converter (RFDAC) circuit includes an RFDAC array circuit including an array of cells arranged into a plurality of segments. Each segment of the plurality of segments is configured to process input data signals. The RFDAC array circuit is configured to process an input data based on activating a set of segments of the plurality of segments, forming a set of active segments, and when the sign of the input data is changed, deactivate a partially active segment of the set of active segments and activate a sign change segment within the RFDAC array circuit. The sign change segment includes a segment within the plurality of segments of the RFDAC array circuit that is different from the set of active segments.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: May 12, 2020
    Assignees: Intel IP Corporation, Intel Corporation
    Inventors: Davide Ponton, Michael Kalcher, Alan Paussa, Edwin Thaller, Franz Kuttner, Daniel Gruber
  • Patent number: 10623118
    Abstract: The system and method for adaptively obtaining coefficients of an inverse model for both equalization and pre-distortion for a multi-channel and reconfigurable RF system. The system preforms real-time learning and adaption and does not require training sets. In some cases, the system learns new coefficients across time and transient changes in performance.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: April 14, 2020
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Ryan C. Lagoy, Gregory M. Flewelling, Thomas J. Johnson
  • Patent number: 10601630
    Abstract: Devices and methods for estimation of quadrature signal imbalance are provided. A quadrature signal is coupled to a computing system. The computing system determines several points on a symmetry function of corrected quadrature signals, and identifies a symmetry point that may satisfy a threshold level. An imbalance corresponding to the identified symmetry point may be used as an imbalance estimate. The imbalance estimate can be used for imbalance correction. Multiple imbalance estimates can be combined to reduce random errors caused by noise. Triangulation can be used to identify a value of symmetry that satisfies a threshold level. Triangulation allows the determination of the location of a symmetry trough by calculating as few as four symmetry points, thereby permitting embodiments to track rapidly changing imbalance. The disclosed embodiments may be employed in optical velocimetry systems, detection and ranging systems such as radar, sonar, and lidar, ultrasonics, and communications systems.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: March 24, 2020
    Inventors: Robert Dickerman, Christopher Dickerman
  • Patent number: 10587327
    Abstract: A transmission apparatus includes M signal processors that respectively generate modulated signals directed to M reception apparatuses, M being an integer equal to or greater than 2, and an antenna section. Each signal processor modulates a first bit sequence made up of two bits to generate a first modulated signal and a second modulated signal, and modulates a second bit sequence made up of other two bits to generate a third modulated signal and a fourth modulated signal, in a case of transmitting multiple streams to a corresponding one of the M reception apparatuses. The antenna section includes a first antenna that transmits the first modulated signal and the third modulated signal and a second antenna that transmits the second modulated signal and the fourth modulated signal. At least either the signals transmitted from the first antenna or the signals transmitted from the second antenna are phase-changed signals.
    Type: Grant
    Filed: May 23, 2019
    Date of Patent: March 10, 2020
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 10567067
    Abstract: A wireless base station that includes: a transmitter that employs a plurality of antenna elements to form a beam in each of a plurality of transmission directions and transmit a reference signal; a receiver that receives a value representing reception quality of the reference signal for a user device that has received the reference signal; a memory; and a processor connected to the memory, the processor being configured to employ an indicator value, representing reception quality for a user device group computed from values received by the receiver that represent reception quality for each of a plurality of user devices, in order to select a combination of beams to employ in user data transmission from the plurality of beams transmitted by the transmitter.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: February 18, 2020
    Assignee: FUJITSU LIMITED
    Inventor: Shinya Kumagai
  • Patent number: 10567030
    Abstract: The disclosure relates to a radio modem for a motor vehicle, having an antenna arrangement, an AD-DA converter and a processor for exchanging communications data between the motor vehicle and at least one object in the vicinity of the motor vehicle. The processor is configured to provide at least one communications standard, which in each case specifies a digital protocol stack for controlling the exchange of communications data and a radio frequency f0 for a radio signal, and implementing every provided communications standard by operating the associated protocol stack and by providing a digital mixer, which is coupled on a baseband side to the protocol stack and on an HF side to the AD-DA converter and which provides for the radio frequency f0 on the HF side, wherein the AD-DA converter is connected directly between the processor and the antenna arrangement.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: February 18, 2020
    Assignee: Audi AG
    Inventor: Jürgen Spehl
  • Patent number: 10567211
    Abstract: An optical transmitter apparatus is disclosed. The apparatus includes a processor, a memory coupled to the processor, and one or more programs configured to be executed by the processor. The programs include instructions for nonlinearity estimation that characterizes nonlinearity in an optical communication and estimates an amount of symbol distortion caused by the nonlinearity, instructions for selecting and mapping symbols to provide, for the nonlinearity estimation, only symbols that meet predetermined nonlinearity criteria, and instructions for storing, in the memory, the amount of symbol distortion to be used for a nonlinearity pre-compensation.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: February 18, 2020
    Assignee: ZTE Corporation
    Inventors: Jianjun Yu, Hung-Chang Chien
  • Patent number: 10560305
    Abstract: Approaches for compensating for RF imperfections in a system that comprises two or more independent modules. The two or more independent modules may be comprised within a remote PHY node (RPN). RF calibration data is stored in one or more non-volatile mediums for two or more independent modules. Each of the two or more independent modules are electronically coupled in a sequence via a transmission medium. A first independent module digital compensates a RF signal for a set of two or more modules that are coupled together in sequence via the transmission medium. The first independent module may correspond to a remote PHY device (RPD).
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: February 11, 2020
    Assignee: Harmonic, Inc.
    Inventor: Adi Bonen
  • Patent number: 10560371
    Abstract: The present disclosure discloses a method and an apparatus for adjusting a working status of an aggregated link. The method includes: when determining to switch a modulation mode of a first sub-link of an aggregated link from a first modulation mode to a second modulation mode, determining a transmission delay of transmitting a data slice in the second modulation mode by using the first sub-link; comparing the transmission delay of transmitting a data slice in the second modulation mode by using the first sub-link with a transmission delay of transmitting a data slice by using another sub-link of the aggregated link, to obtain a difference; and if the difference meets a preset condition, sending information for controlling a working status of the first sub-link to a transmit end device, so that the transmit end device controls the working status of the first sub-link in the second modulation mode.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: February 11, 2020
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventor: Yu Meng
  • Patent number: 10555309
    Abstract: An embodiment of the present invention relates to a method by which a base station transmits a downlink signal in wireless communication system, the method including the steps of: transmitting a demodulation-reference signal (DMRS) approval; determining a long-term channel property from the DMRS of a first slot of an uplink sub-frame received by responding to the DMRS approval; receiving a first reference signal from a second slot of the sub-frame on the basis of the determined long-term channel property; determining a short-term channel property from the first reference signal; determining a pre-coding matrix from the long-term channel property and the short-term channel property; and transmitting a downlink signal through the determined pre-coding matrix.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: February 4, 2020
    Assignee: LG ELECTRONICS INC.
    Inventors: Hyukjin Chae, Youngtae Kim, Bonghoe Kim
  • Patent number: 10541657
    Abstract: Certain aspects of the present disclosure are directed to a digital predistortion (DPD) device for use within a wireless transmitter that permits the use of a downstream digital-to-analog converter that operates at a clock rate close to the bandwidth of a digital baseband input signal. In some examples, a sampling rate of a digital baseband input signal is increased using an upsampler to obtain an increased rate digital input signal. Predistortion is applied to the increased rate digital input signal using a DPD device to obtain a predistorted digital signal. The sampling rate of the predistorted digital signal is then decreased using a downsampler to obtain a lower-rate predistorted digital signal with a sampling rate below the increased rate of the upsampler (e.g. close to the bandwidth of a digital baseband input signal). A low pass filter may be provided to filter out-of-band signal components from the predistorted digital signal.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: January 21, 2020
    Assignee: QUALCOMM Incorporated
    Inventors: Igor Gutman, Ariel Sagi, Alecsander Eitan
  • Patent number: 10516209
    Abstract: Synthesizers (32, 24) for synthesizing feedback signals output from a plurality of antenna modules (4) are provided. A distortion compensation signal output unit (15) derives, from a difference between a feedback signal synthesized by the synthesizers (32, 24) and a base band signal output from a modulation unit (12), a distortion compensation coefficient that provides, to the base band signal, distortion characteristics opposite to distortion characteristics of a signal radiated from the phased array antenna and outputs a predistortion signal representing the distortion compensation coefficient to a PD unit (13).
    Type: Grant
    Filed: April 1, 2016
    Date of Patent: December 24, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hifumi Noto, Nobuhiko Ando, Hideyuki Nakamizo, Morishige Hieda, Hideki Morishige
  • Patent number: 10511361
    Abstract: A method for determining a precoding matrix for a MIMO transmitter based on a weighted MMSE algorithm is disclosed. A precoding module identically transforms a first matrix expression into a second matrix expression. The first matrix expression comprises a matrix inversion operation of a quadratic matrix having a rank equal to a number of antennas of the MIMO transmitter. The second matrix expression comprises a matrix inversion operation of a quadratic matrix having a rank equal to a number of receivers scheduled for the MIMO transmitter.
    Type: Grant
    Filed: June 17, 2015
    Date of Patent: December 17, 2019
    Assignee: Intel Corporation
    Inventors: Wenting Chang, Guangjie Li, Yujun Chen, Xu Zhang
  • Patent number: 10505614
    Abstract: Disclosed are CSI feedback method, a precoding method, and an apparatus. In the present invention, after a terminal determines first precoding matrices on a first subband, the terminal obtains second precoding matrices corresponding to physical resources in the first subband according to the first precoding matrices and a column vector arrangement mode corresponding to the first precoding matrices; and then, the terminal determines CSI on a second subband according to the second precoding matrices. In the embodiment, precoding matrices are expanded according to a column vector arrangement mode, so as to obtain second precoding matrices corresponding to different physical resources; accordingly based on the second precoding matrices, CSI is measured by using the corresponding second precoding matrices on different physical resources.
    Type: Grant
    Filed: February 20, 2017
    Date of Patent: December 10, 2019
    Assignee: China Academy of Telecommunications Technology
    Inventors: Wenhong Chen, Runhua Chen, Qiubin Gao, Tamrakar Rakesh, Hui Li
  • Patent number: 10491198
    Abstract: Methods, apparatus, systems and articles of manufacture are disclosed to provide phase imbalance correction. An example system includes a phase detector to obtain a first signal and generate a first output, a comparator coupled to the phase detector, the comparator to generate a second output based on the first output, and an amplifier coupled to the comparator, the amplifier to adjust a first phase response of the first signal based on the second output.
    Type: Grant
    Filed: December 28, 2018
    Date of Patent: November 26, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Tolga Dinc, Salvatore Luciano Finocchiaro, Gerd Schuppener, Siraj Akhtar, Swaminathan Sankaran, Baher Haroun
  • Patent number: 10476536
    Abstract: A distortion compensation device includes an electric power amplifier that amplifies a transmission signal, and a processor that executes a process including: first identifying, by using a series that includes a plurality of coefficients or by using a look-up table that stores therein distortion compensation coefficients, an inverse characteristic of nonlinear distortion generated in the transmission signal in the electric power amplifier; second identifying, by using a plurality of coefficients, an inverse characteristic of linear distortion generated in the transmission signal in the electric power amplifier; and setting the coefficients for the first identifying and the second identifying such that a coefficient of a term with a degree of 1 in the series used in the first identifying or a sum of the plurality of coefficients used in the second identifying is a constant.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: November 12, 2019
    Assignee: FUJITSU LIMITED
    Inventor: Toshio Kawasaki
  • Patent number: 10476566
    Abstract: A transmission device comprising: a weighting circuity which, in operation, generates transmission signals of n streams (n is an integer of 3 or more) by weighting modulated signals of the n streams using a predetermined fixed precoding matrix; a phase changing circuity which, in operation, regularly changes each phase of a symbol series included in each of the transmission signals of the n streams; and a transmitter which, in operation, transmits the transmission signals of the n streams from different antennas, the phases of each of the transmission signals of the n streams being changed in each symbol, wherein the transmission signal of an i-th stream has an mi kind of phase change value y1(t) (i is an integer between 1 and n (inclusive), 0?yi<2?, and mi is set in each stream, t is an integer of 0 or more, and indicates a symbol slot), and the phase changing circuity changes the phase in one or more u (u=m1×m2× . . .
    Type: Grant
    Filed: February 5, 2019
    Date of Patent: November 12, 2019
    Assignee: SUN PATENT TRUST
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 10476538
    Abstract: A mobile terminal performing harmonic rejection includes a plurality of baseband units generating a baseband signal; a plurality of up-converters converting the baseband signal into a radio frequency (RF) signal; and a controller controlling phases of a plurality of signals applied to the plurality of baseband units and the plurality of up-converters. Meanwhile, the controller may perform at least one of a harmonic rejection mode, a first non-harmonic rejection mode for improving a signal-to-noise ratio (SNR), and a second non-harmonic rejection mode for improving linearity to provide a transmitting part having improved harmonic distortion characteristics and the mobile terminal having the transmitting part.
    Type: Grant
    Filed: April 5, 2018
    Date of Patent: November 12, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Harri Riihihuhta, Sami Vilhonen, Samu Laaja
  • Patent number: 10469149
    Abstract: Disclosed are a beam scanning method and a base station, the method in which generated is a code book comprising a plurality of second precoders, defined by the weighted sums of a plurality of first precoders, and in which a plurality of synchronization signals, to which applied are second precoders that are selected from the code book and differ from each other, are transmitted to a terminal over a plurality of time intervals. The synchronization signals are used in synchronization, beam scanning and cell ID acquisition of the terminal, and each weighted sum applied to the plurality of first precoders indicates a beam ID used in the beam scanning.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: November 5, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Kilbom Lee, Jiwon Kang, Kitae Kim, Kungmin Park, Heejin Kim
  • Patent number: 10469215
    Abstract: A system and method of operating an Internet of Things (IOT) device and an IOT manager device. The method includes determining, during operation of the IOT device in a low power mode, an orthogonal time frequency space (OTFS) transmission waveform using two-dimensional (2D) channel state information relevant to a delay-Doppler channel domain. The method further includes transmitting, during operation of the IOT device in a high power mode, the OTFS transmission waveform. The process of determining the OTFS transmission waveform may include, for example, receiving, from the IOT manager device, the 2D channel state information and storing it within a memory of the IOT device. Alternatively, at least one OTFS pilot transmission may be received from the IOT manager device and the 2D channel state information determined using the OTFS pilot transmission.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: November 5, 2019
    Inventors: Selim Shlomo Rakib, Ronny Hadani
  • Patent number: 10461790
    Abstract: The present invention generally relates to the field of electrical communication and more specifically to apparatuses and methods of phase noise mitigation for signal transmission in wideband telecommunication systems. The method for compensation of the phase noise effect on the data transmission through a radio channel is based on a possibility to present the phase noise of a reference oscillator like a random process where the main spectral density is concentrated in the low-frequency region. Therefore, the number of estimated parameters can be reduced many times to several low-frequency spectral components instead of a direct estimation in the time domain. The advantage of the method is an improvement of the estimation accuracy and a reduction of the computational complexity.
    Type: Grant
    Filed: February 11, 2019
    Date of Patent: October 29, 2019
    Assignee: LIMITED LIABILITY COMPANY “RADIO GIGABIT”
    Inventors: Andrey Arkadievich Shevchenko, Alexey Fedorovich Klyuev, Mikhail Vyacheslavovich Panteleev, Roman Olegovich Maslennikov, Alexey Andreevich Artemenko
  • Patent number: 10462806
    Abstract: The choice of a transmit (Tx)-Receive (Rx) beam pair out of many available beam pairs between a base station and a millimeter wave (mmW)-capable UE is directly related to the performance of transmission between the base station and the UE. A method, apparatus, and computer-readable medium at a transmitting user equipment (UE) capable of (mmW) communication are disclosed to determine a new serving Tx-Rx beam pair based on cumulative strengths of a plurality of Tx-Rx beam pairs. The UE may iteratively perform a process of, until a predetermined number of synchronization cycles is reached: selecting one of the plurality of Transmit (Tx)-Receive (Rx) beam pairs based at least in part on a scheduling opportunity value of the selected Tx-Rx beam pair that has not been measured for a current synchronization period; and measuring a strength of the selected Tx-Rx beam pair.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: October 29, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Jun Zhu, Raghu Narayan Challa
  • Patent number: 10454735
    Abstract: This disclosure relates to a peak reduction circuit and method for reducing peaks by identifying peak sample values exceeding a pre-set threshold value in an aggregated baseband carrier signal and determining a maximum peak sample by detecting its maximum peak absolute value and phase. A search is performed a pre-determined search length beyond an identified peak. A stored, predetermined filter impulse response based on the carrier passband configuration is retrieved and its amplitude and phase of the predetermined filter impulse response is adjusted by means of the phase and absolute value of the determined maximum peak sample. Finally, the aggregated baseband carrier signal and the adjusted predetermined filter impulse response are combined by synchronizing their maximum peaks and their opposite phase values for adjusting the aggregated baseband carrier signal to said pre-set threshold value.
    Type: Grant
    Filed: October 15, 2015
    Date of Patent: October 22, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Tore André, Daniel Larsson
  • Patent number: 10447520
    Abstract: Low-complexity computational processing provides a set of selective mapping weights for reducing peak-to-average-power ratio (PAPR) in transmitted Multiple Input, Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) signals. A MIMO precoder and invertible transform generates a base discrete-time MIMO-OFDM signal from a set of data symbols and MIMO precoding weights. A matrix multiplier multiplies the set of data symbols with a sparse update weight matrix, and the resulting product is MIMO-precoded and modulated onto an OFDM signal to produce a discrete-time update signal. A linear combiner sums the discrete-time update signal and the base discrete-time MIMO-OFDM signal to produce an updated discrete-time MIMO-OFDM signal from which the PAPR can be measured.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: October 15, 2019
    Assignee: Genghiscomm Holdings, LLC
    Inventor: Steve Shattil
  • Patent number: 10433293
    Abstract: A method for receiving a downlink signal according to a Demodulation Reference Signal (DMRS)-based transmission scheme, performed by a mobile terminal, in a wireless communication system is disclosed. The method includes receiving indication information indicating whether rate matching or timewise Resource Element (RE) pairing is allowed for REs that do not constitute frequency-wise RE pairs for Space Frequency Block Coding (SFBC) on symbols to which DMRSs are mapped in a Resource Block (RB) for a DL data channel, and decoding the downlink data channel, on assumption that the REs that do not constitute frequency-wise RE pairs for SFBC are rate-matched, or constitute time-wise RE pairs to which transmission data is mapped, according to the indication information.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: October 1, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Kunil Yum, Hyungtae Kim, Jonghyun Park, Haewook Park
  • Patent number: 10425114
    Abstract: In various embodiment, the disclosed systems, methods, and apparatuses describe the application of a pre-distortion at a transmitting device, such as a headend or a remote PHY device, to modify signals to be transmitted on a cable network in order to account for the distortions to the signals received by one or more devices on the network. In an embodiment, the pre-distortions can be implemented in the analog domain or in the digital domain, for example, using analog filters, or digital signal processing (DSP) devices. In an embodiment, the pre-distortion can be applied on particular subcarriers associated with the signals, without being applied to other subcarrier associated with the signals.
    Type: Grant
    Filed: January 19, 2018
    Date of Patent: September 24, 2019
    Assignee: Cox Communications, Inc.
    Inventor: Jeffrey L. Finkelstein
  • Patent number: 10419118
    Abstract: An optical transmission device includes: a memory; and a processor coupled to the memory; the processor: generate a first symbol by mapping a transmission data series to a first signal point which belongs to a first group within a signal space defined with regard to characteristics of an optical carrier wave of the transmission data series; generate a second symbol by mapping the transmission data series to a second signal point belonging to a second group; calculate a perturbation quantity of a signal electric field for each of the first and second symbols based on signal electric field vector information of a symbol which is generated before the first symbol and the second symbol; and determine, as a transmission signal, a symbol having a smaller perturbation quantity between the first symbol and the second symbol.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: September 17, 2019
    Assignee: FUJITSU LIMITED
    Inventor: Hiroyuki Irie
  • Patent number: 10404380
    Abstract: Embodiments of this disclosure provide a compensation apparatus for an offset drift, a received signal recovery apparatus and a receiver, in which estimation and compensation of an offset drift are directly performed at a receiver end, with no need of extra provision of an offset control circuit at a transmitter end, so that the system is simple in structure, applicable to various modulation formats, wide in applicability, and is able to meet demands for high-order modulation formats. And furthermore, by equalizing a received signal and performing phase recovery on a frequency difference and phase noises, information on offset points of a modulator of the transmitter end may be accurately separated, thereby accurately compensating for the offset drift of the modulator of the transmitter end.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: September 3, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Yangyang Fan, Zhenning Tao
  • Patent number: 10404395
    Abstract: A first transmission signal and a second transmission signal are generated from a first modulated signal and a second modulated signal by using a precoding matrix, and parameters of the precoding matrix are calculated from feedback information.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: September 3, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 10394241
    Abstract: Systems and methods are provided for effecting control through multi-stage voting. A control system may be in communication with an actuator device responsive to a voted command. A multi-stage voting system may be configured to determine the voted command. A set of controllers and a monitor controller may provide commands to the multi-stage voting system. The multi-stage voting system includes logic with a first stage that compares the commands of the set of controllers to each other, and a second stage that compares at least one of those commands to the monitor command. The multi-stage voting system delivers the voted command to the actuator device based on the comparisons made in the first and second stages. The actuator device effects an operation in response to the voted command.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: August 27, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Rami I. Debouk, Gurmitsingh M. Banvait, Padma Sundaram, Samuel E. Graham
  • Patent number: 10396723
    Abstract: A system and method for pre-distorting a digital signal in a digital communications system. The method includes converting digital bits to be transmitted to a series of symbols defining the bits and providing the symbols to a pulse shaping filter (PSF) that provides samples of the symbols at a predetermined sample rate. The method also includes providing the filtered samples to a pre-distorter that pre-distorts the samples, wherein pre-distorting the samples includes providing a non-linear transformation of the samples that is defined by pre-distorter taps, and providing the pre-distorted samples to a power amplifier to be transmitted, where pre-distorting the samples includes modeling the power amplifier and associated transmitter components using a degree three memory polynomial.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: August 27, 2019
    Assignee: Northrop Grumman Systems Corporation
    Inventors: Daniel Haas, Peter Ly
  • Patent number: 10382233
    Abstract: Techniques for processing of symbols (e.g., orthogonal frequency division multiplexing (OFDM) or single carrier-frequency division multiple access (SC-FDMA) symbols) provide enhanced out-of-band (OOB) suppression of the symbols and also provide reduced inter-symbol interference (ISI) between a symbol and a subsequent symbol. Multiple frequency tones of a symbol may be divided into two or more subsets of tones. For example, subsets of tones associated with a head portion or a tail portion of an OFDM symbol may be processed with a relatively long weighted overlap-add (WOLA) weighting length or filtering length, and a subset of tones associated with a center portion of the OFDM symbol may be processed with a relatively short WOLA weighting length or filtering length. Such heterogeneous processing of tones within a symbol may provide enhanced inter-channel interference (ICI) and improved OOB suppression and also provide reduced ISI for the center tones of the symbol.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: August 13, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Muhammad Sayed Khairy Abdelghaffar, Jing Jiang, Seyong Park, Wei Zeng, Joseph Binamira Soriaga, Tingfang Ji
  • Patent number: 10374859
    Abstract: The present disclosure relates to a 5G or pre-5G communication system for providing a higher data rate after a 4G communication system such as LTE. Particularly, the present disclosure relates to pre-processing for Filter Bank Multi-Carrier (FBMC) in a wireless communication system, and a method of a communication node includes the operations of receiving a signal from a counterpart node, determining a pre-processing scheme according to a channel and a frequency confinement characteristic of a filter based on the received signal, and performing pre-processing for a subcarrier set corresponding to the filter in accordance with the determined pre-processing scheme.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: August 6, 2019
    Assignees: Samsung Electronics Co., Ltd., Industry-Academic Cooperation Foundation, Yonsei University
    Inventors: Kyeongyeon Kim, Dongkyu Sim, Taehyun Lee, Chungyong Lee
  • Patent number: 10367671
    Abstract: High peak-to-average ratio of OFDM signals requires large back-off from an RF power amplifier's saturation power. A spectral shaper device therefore increases the output power and efficiency of the power amplifier. The shaper device performs linearization through digital predistortion, based on an out-of-band regrowth limit, as well as the EVM requirement for a particular data rate. The shaper can distribute the error energy, precisely, over frequencies such that each of the inband and out-of-band requirements is independently and individually met. The shaper distributes error energy to frequency regions in the spectrum to the maximally allowed by the standards and regulations, while not increasing the total error. The error energy is kept to the minimum where it is crucial in meeting EVM requirements. In this way, the shaper maximizes the allowable output power of the nonlinear power amplifier.
    Type: Grant
    Filed: November 28, 2017
    Date of Patent: July 30, 2019
    Assignee: AVAGO TECHNOLOGIES INTERNATIONAL
    Inventors: Dengwei Fu, Colin Fraser, Amir Eliaz, Daniel Stopler, Sandeep Shenoy
  • Patent number: 10367568
    Abstract: A split radio access network is provided that efficiently transmits beamforming coefficients from a distributed baseband unit device to a remote radio unit device to facilitate beamforming at the remote radio unit. The beamforming coefficients can be determined at the baseband unit device and transmitted along with the IQ data (data to be beamformed) to the remote radio unit device. Due to the large number of antenna ports however, there can still be a very large number of coefficients to transmit, and the disclosure provides for a compressed set of coefficients that reduces the overhead signaling requirements. Instead of sending coefficients for every kth antenna port, the system can select a subset of the coefficients corresponding to a set of k antenna ports which can be used by the remote radio unit to approximate the full set of beamforming coefficients.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: July 30, 2019
    Assignee: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: SaiRamesh Nammi, Aditya Chopra, Arunabha Ghosh, Milap Majmundar
  • Patent number: 10324876
    Abstract: Orthogonal differential vector signaling codes are described which support encoded sub-channels allowing transport of distinct data and clocking signals over the same transport medium. Embodiments are described which are suitable for implementation in both conventional high-speed CMOS and DRAM integrated circuit processes.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: June 18, 2019
    Assignee: KANDOU LABS, S.A.
    Inventor: Amin Shokrollahi
  • Patent number: 10314040
    Abstract: [Object] To provide a mechanism capable of accommodating legacy terminals not supporting GFDM in addition to terminals supporting GFDM when GFDM is introduced. [Solution] A device includes: a setting unit configured to variably set at least one of an interval between subcarriers and a time length of a subsymbol included in a unit resource constituted by one or more subcarriers or one or more subsymbols; and a transmission processing unit configured to perform filtering for every predetermined number of subcarriers.
    Type: Grant
    Filed: August 24, 2016
    Date of Patent: June 4, 2019
    Assignee: SONY CORPORATION
    Inventors: Ryota Kimura, Ryo Sawai, Yukitoshi Sanada, Hiroki Matsuda
  • Patent number: 10305563
    Abstract: A massive antenna-based pattern/polarization beam division multiple access method and an apparatus performing the same are provided. The massive antenna-based pattern/polarization beam division multiple access method includes generating a plurality of beam sectors for each antenna array by using a plurality of pattern/polarization antenna arrays and performing MIMO transmission in each of the plurality of beam sectors, wherein the plurality of pattern/polarization antenna arrays each have a different radiation pattern.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: May 28, 2019
    Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Gye Tae Gil, Dong Ho Cho, Ju Yong Lee, Dae Hee Park, Yong Hoon Lee, Sang Min Oh, Seung Won Keum
  • Patent number: 10305523
    Abstract: A transmitting device, for handling signal interference, comprises a first transmitting circuit, for processing a first plurality of baseband signals, to generate a first plurality of radio frequency signals; a second transmitting circuit, for processing a second plurality of baseband signals and a plurality of input signals, to generate a second plurality of radio frequency signals; a feedback circuit, coupled to the second transmitting circuit, for processing the second plurality of radio frequency signals and a plurality of leakage signals, to generate a plurality of error signals; and a control circuit, coupled to the first transmitting circuit, the second transmitting circuit and the feedback circuit, for generating the plurality of input signals according to the first plurality of baseband signals and the plurality of error signals.
    Type: Grant
    Filed: September 3, 2018
    Date of Patent: May 28, 2019
    Assignee: Realtek Semiconductor Corp.
    Inventors: Chin-Liang Wang, Min-Chau Jan, Wen-Shan Wang, Yuan-Shuo Chang, Wu-Chi Wang, Ying-Hsi Lin
  • Patent number: 10298300
    Abstract: A method of a user equipment (UE) for a channel state information (CSI) feedback in an advanced communication system. The method comprises receiving, from a base station (BS), CSI feedback configuration information for a pre-coding matrix indicator (PMI) feedback based on a linear combination (LC) codebook, wherein the PMI comprises a first PMI (i1) and a second PMI (i2), determining the first PMI (i1) and the second PMI (i2) indicating an LC pre-coder that corresponds to a weighted linear combination of a first beam and a second beam, wherein the first PMI (i1) includes a first beam indicator (i1,1, i1,2) and a second beam indicator (i1,3) that indicate the first beam and a distance (d1, d2) of the second beam in accordance with the first beam, respectively; and the second PMI (i2) indicates weights assigned to the first beam and the second beam. The method further comprises transmitting, to the BS, the CSI feedback over an uplink channel including the determined first PMI (i1) and the second PMI (i2).
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: May 21, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Md. Saifur Rahman, Eko Onggosanusi
  • Patent number: 10267655
    Abstract: A CV conversion amplifier is provided that can secure a sufficient capacitance-to-voltage conversion gain and a sufficient amplitude range of an output voltage with a small consumption current. A capacitive sensor using the CV conversion amplifier is provided with low electric power, low noise, and a wide tolerance of input signals. The CV conversion amplifier accepts outputs, as inputs, from a first capacitance and a second capacitance whose capacitance is changed depending on a physical quantity and converts a capacitance value into a voltage.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: April 23, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Oshima, Makoto Takahashi, Yuki Furubayashi
  • Patent number: 10256884
    Abstract: The present invention relates to a method and an apparatus for quantizing channel state information (CSI). According to an embodiment of the present invention, a method for quantizing CSI is provided, which can be implemented on a base station side. The method includes: broadcasting antenna configuration of a base station to a user equipment, wherein the antenna configuration includes an antenna port in a vertical direction and an antenna port in a horizontal direction; sending a reference signal (RS) to the user equipment; receiving a vertical precoder corresponding to the antenna port in a vertical direction and a horizontal precoder corresponding to the antenna port in a horizontal direction that are fed back by the user equipment; and based on the received vertical precoder and horizontal precoder, reconstructing a precoder by using a vertical codebook corresponding to the antenna port in a vertical direction and a horizontal codebook corresponding to the antenna port in a horizontal direction.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: April 9, 2019
    Assignee: Alcatel Lucent
    Inventors: Xun Li, Qinglin Luo, Tao Yang
  • Patent number: 10256853
    Abstract: A method of operating a communications system includes receiving a signal at a digital predistorter (DPD), introducing predistortion to the signal using the DPD, and converting the predistorted signal to an analog signal using a digital-to-analog converter having a first bandwidth. The method also includes amplifying the analog signal, sampling the amplified signal using an analog-to-digital converter having a second bandwidth less than the first bandwidth, and extracting coefficients of the DPD from the sampled signal.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: April 9, 2019
    Assignee: Dali Systems Co. Ltd.
    Inventors: Wan-Jong Kim, Shawn Patrick Stapleton