Antinoise Or Distortion (includes Predistortion) Patents (Class 375/296)
  • 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
  • Patent number: 10243773
    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: June 27, 2018
    Date of Patent: March 26, 2019
    Assignee: Genghiscomm Holdings, LLC
    Inventor: Steve Shattil
  • Patent number: 10230378
    Abstract: The disclosure relates to a phase shifter having a first mode of operation and a second mode of operation, the phase shifter comprising a mixer stage configured to mix an oscillator signal with an analog signal to provide a phase shifted signal, switching circuitry and a controller arranged to provide the analog signal to the mixer stage as a voltage in the first mode of operation and as a current in the second mode of operation.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: March 12, 2019
    Assignee: NXP B.V.
    Inventors: Stephane Thuries, Cristian Pavao Moreira, Gilles Montoriol
  • Patent number: 10225485
    Abstract: According to some embodiments, a camera captures images at a high dynamic range. These images are then tonemapped into images of a lower dynamic range with enhanced contrast. The contrast enhancement for a given pixel depends on the image's local contrast at a variety of different scales. Calculation of this contrast is accelerated by the camera creating a plurality low-pass filtered versions of the original image at progressively stronger low-pass filtering; these images may be stored at increasingly lower resolutions in a mipmap. Calculations are enhanced by use of a massively parallel processor and a texture mapping unit for hardware-accelerated sampling of blended averages of several pixels. Other embodiments are shown and discussed.
    Type: Grant
    Filed: October 11, 2015
    Date of Patent: March 5, 2019
    Inventor: Oliver Markus Haynold
  • Patent number: 10218392
    Abstract: A digital predistortion linearization method is provided for increasing the instantaneous or operational bandwidth for RF power amplifiers employed in wideband communication systems. Embodiments of the present invention provide a method of increasing DPD linearization bandwidth using a feedback filter integrated into existing digital platforms for multi-channel wideband wireless transmitters. An embodiment of the present invention utilizes a DPD feedback signal in conjunction with a low power band-pass filter in the DPD feedback path.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: February 26, 2019
    Assignee: Dali Systems Co. Ltd.
    Inventors: Wan-Jong Kim, Shawn Patrick Stapleton
  • Patent number: 10212013
    Abstract: A signal clipping processing method and a device, the method including performing peak detection on an input signal, so as to obtain amplitude information, phase information, and location information of a peak signal of the input signal; obtaining, according to amplitude information and phase information of each peak signal, a peak forming factor corresponding to each peak signal, and separately outputting, according to location information of each peak signal, a corresponding cancellation pulse sequence; and calculating a sum of products of peak forming factors corresponding to all peak signals and cancellation pulse sequences corresponding to all the peak signals, so as to obtain a clipping noise, and using a difference between the input signal and the clipping noise as a signal obtained after clipping processing.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: February 19, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Jing Qiu, Tingjian Tian, Yunfu Dou
  • Patent number: 10205496
    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 yi(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: June 22, 2018
    Date of Patent: February 12, 2019
    Assignee: SUN PATENT TRUST
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 10200219
    Abstract: Systems and methods are provided for adaptive control of pre-distortion during signal transmissions. While applying pre-distortion during processing of an input signal for transmission, feedback data may be generated based on a plurality of feedback signals, and adjustments to the pre-distortion may be applied to the pre-distortion based on the feedback data. Each of feedback signals corresponds to a particular processing stage performed during the processing of the input signal. Generating the feedback data comprises applying adjustments to the plurality of feedback signals based on a type and/or a source of at least one feedback signal, with the adjustments comprising one or more of: applying a gain to one of the plurality of feedback signals; applying a delay to one of the plurality of feedback signals; and modifying a first one of the plurality of feedback signals based on a second one of the plurality of feedback signals.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: February 5, 2019
    Assignee: MAXLINEAR, INC.
    Inventors: Sridhar Ramesh, Timothy Gallagher, Ali Shahed hagh ghadam
  • Patent number: 10164584
    Abstract: A synthesizer circuit to generate a local oscillator carrier signal for a baseband signal includes a controlled oscillator comprising a phase lock loop and an oscillator configured to generate an oscillating signal. A pulling compensation circuit is configured to generate a correction signal for a present output of the phase locked loop using information on an error of the oscillating signal, information on a present sample of a baseband signal and a preceding correction signal for a preceding output of the phase locked loop.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: December 25, 2018
    Assignee: Intel IP Corporation
    Inventors: Rotem Avivi, Giuseppe Li Puma
  • Patent number: 10153793
    Abstract: The disclosure relates to devices, methods, and computer programs in mobile communications in order to reduce signal distortions. Specifically, it relates to a transmitter system which comprises a plurality of signal paths. Each signal path is associated with an input transmission signal. Each signal path comprises an analog portion of the signal path. Each 5 signal path comprises a Dual-Input Digital Predistortion, DI DPD, module. The DI DPD is configured to provide a predistorted input transmission signal to the analog portion in response to a received Crosstalk and Mismatch, CTM, signal and the input transmission signal. The transmitter system further comprises one or more CTM modules configured to receive one or more input transmission signals. The CTM module comprises to separately generate for 10 each DI DPD module the CTM signal, where said CTM signals represent CTM distortions caused by one or more output transmission signals of each said analog portion.
    Type: Grant
    Filed: May 17, 2016
    Date of Patent: December 11, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Katharina Hausmair, Thomas Eriksson, Christian Fager, Ulf Gustavsson
  • Patent number: 10153818
    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: December 11, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Md. Saifur Rahman, Eko Onggosanusi
  • Patent number: 10149306
    Abstract: Techniques disclosed herein involve network-side and device-side operations that provide for the advantageous use of a reduced set of precoders within a larger full set of precoders. The reduced set is identified dynamically, based on characteristics of the channel between a radio network node and a wireless device, and the use of a defined mapping function that maps the reduced set of precoders within the larger full set to a reduced set of index values. Reporting precoders from the reduced set offers significant reductions in signaling overhead because of the smaller size of the index values used to index the reduced set, while simultaneously offering the ability to choose from precoders matched to current channel conditions.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: December 4, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Jonas Fröberg Olsson, Mirsad Cirkic, Martin Hessler, Kristina Hessler
  • Patent number: 10148328
    Abstract: The present disclosure provides a method of generating codebook in a wireless communication system with multiple antenna arrays, as well as a wireless communication system, base station and terminal using the codebook for communication. The method comprises steps of: providing a basic codebook which contains multiple pre-coding matrices; and assigning phase offsets to certain pre-coding matrices in the basic codebook to form a codebook with phase offset. The feedback overhead from a client to a base station side is reduced and a good precision of feedback for multi-antenna array is kept by applying the method of generating codebook and using the generated codebook in the wireless communication system, base station and terminal.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: December 4, 2018
    Assignee: Sun Patent Trust
    Inventors: Hui Tong, Masayuki Hoshino, Ming Xu, Seigo Nakao, Daichi Imamura
  • Patent number: 10148231
    Abstract: An apparatus includes an RF power amplifier with a controller and an impedance matching network. The RF power amplifier is configured to drive a load in electrical communication with the RF power amplifier. The impedance matching network is located electrically between the RF power amplifier and the load. The impedance matching network is configured to match an output impedance of the RF power amplifier and an impedance of the load. The impedance matching network includes a set of fixed value impedance matching circuits configured to provide different discrete values. The RF amplifier includes a variable DC power supply powering RF transistors to result in a variable output impedance for the amplifier. The controller selects an impedance matching circuit of the capacitor presets and/or the right setting for the variable DC supply that result in minimum reflected power to match the output impedance of the amplifier to the output load impedance.
    Type: Grant
    Filed: June 14, 2016
    Date of Patent: December 4, 2018
    Assignee: Analogic Corporation
    Inventors: Ahmed A. Hussein, Gerald A. Brimmer, Robert G. Haefner, Jr., Matthew Hanlon
  • Patent number: 10148230
    Abstract: A predistortion circuit receives an input polar signal to be transmitted, including an input amplitude signal and an input phase signal. The input polar signal is predistorted using at least one predistortion parameter selected from a lookup table. A phase-and-amplitude modulated radio-frequency signal is generated corresponding to the predistorted polar signal. A copy of the generated radio-frequency signal is provided to a polar receiver. The polar receiver is operated to generate, from the copy of the radio-frequency signal and without information relating to the generated transmit signal, a feedback polar signal including a feedback amplitude signal and a feedback phase signal. The feedback polar signal is compared to the input polar signal, the lookup table is updated in response to the comparison.
    Type: Grant
    Filed: July 19, 2017
    Date of Patent: December 4, 2018
    Assignee: Innophase, Inc.
    Inventors: Yang Xu, Sara Munoz Hermoso
  • Patent number: 10142801
    Abstract: Embodiments of the disclosure relate to a transceiver circuit employing shared digital signal processing circuitry for communicating radio frequency (RF) analog communications signals received by a remote unit in a wireless distribution system (WDS). A transceiver circuit includes downlink digital signal processing circuitry that receives and processes a downlink digital communications signal(s) having a first downlink digital baseband signal and a second downlink digital baseband signal. A first downlink analog signal path and a second downlink analog signal path share the downlink digital signal processing circuitry. The first downlink analog signal path generates a first downlink analog RF communications signal. The second downlink analog signal path generates a second downlink analog RF communications signal.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: November 27, 2018
    Assignee: Corning Optical Communications Wireless Ltd
    Inventor: Maor Saig
  • Patent number: 10142150
    Abstract: An exemplary embodiment of the present invention provides a pilot signal generating apparatus, including: a changed amount estimating unit which estimates a changed amount of a pilot symbol due to interference of a data symbol which is adjacent to a predefined position of the pilot symbol; and a symbol generating unit which generates the pilot symbol in consideration of the estimated changed amount.
    Type: Grant
    Filed: October 6, 2016
    Date of Patent: November 27, 2018
    Assignees: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, KYUNGPOOK NATIONAL UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION
    Inventors: Young Su Kim, Dong Seog Han, Myung Chul Park, Hyoung Soo Lim, Nam Ho Hur
  • Patent number: 10103775
    Abstract: A method and radio node for controlling transmission of radio signals in a transmitter band to avoid or reduce interference in a victim band, the victim band being separate from the transmitter band in frequency domain. The radio node applies Digital Pre-Distortion, DPD, on signals to be transmitted on at least one carrier in the transmitter band, such that Intermodulation Distortion, IMD, components of the signals are pre-distorted asymmetrically relative the at least one carrier to suppress at least one of the IMD components falling within the victim band. The pre-distorted signals are then amplified in a power amplifier and transmitted on the at least one carrier.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: October 16, 2018
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Kauko Heinikoski, Marko E Leinonen
  • Patent number: 10084630
    Abstract: A system for use with beam signals, the system including: a crest factor reduction (CFR) module having inputs and corresponding outputs, wherein each of the inputs is for receiving a corresponding different beam signal of the beam signals and wherein each output corresponds to a different input of the plurality of inputs and is for outputting a different CFR-adjusted signal of a plurality of CFR-adjusted signals, each CFR-adjusted signal of the plurality of CFR-adjusted signals corresponding to a different beam signal of the plurality of beam signals; and a transmitter connected to the outputs of the CFR module, wherein the CFR module is configured to perform crest factor reduction on the beam signals to generate the plurality of CFR-adjusted signals, and wherein the crest factor reduction performed on the beam signals is based on a weighted sum of the magnitudes of multiple beams signals among the beam signals.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: September 25, 2018
    Assignee: Blue Danube Systems, Inc.
    Inventors: Chris Tsun Kit Ng, Ramesh Chembil-Palat
  • Patent number: 10084463
    Abstract: A transceiver including: a reconfigurable circuit including a plurality of units including at least a converter, the converter including: a digital-to-analog converter (DAC); successive approximation register (SAR) logic configured to selectively couple to the DAC; and a plurality of switches configured to reconfigure the plurality of units of the reconfigurable circuit to operate the transceiver in a receive mode or transmit mode.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: September 25, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Haim Mendel Weissman, Mahim Ranjan
  • Patent number: 10075137
    Abstract: Power amplification system for radio frequency communications, comprising a input port of an input radio frequency signal, an output port of an output radio frequency signal; a digital predistortion unit operatively interposed between the input port and the output port and quadrature modulation correction means operatively interposed between the digital predistortion unit and between at least one of the input port and the output port.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: September 11, 2018
    Assignee: Teko Telocom, S.r.l.
    Inventors: Davide Durante, Massimo Notargiacomo, Giovanni Chiurco, Flavia Martelli
  • Patent number: 10075324
    Abstract: A predistortion processing apparatus: an auxiliary feedback module, configured to: extract a nonlinear distortion signal from an analog signal, and input an obtained feedback signal corresponding to the nonlinear distortion signal into an auxiliary model coefficient training module; the auxiliary model coefficient training module, configured to: train an auxiliary coefficient according to the feedback signal and a predistortion signal, and transmit a first auxiliary coefficient obtained through training to a predistortion processing module; a radio frequency signal feedback module, configured to extract a fundamental wave feedback signal; a predistortion model coefficient training module, configured to: train a predistortion coefficient according to the predistortion signal and the fundamental wave feedback signal, and transmit an obtained predistortion coefficient to the predistortion processing module; the predistortion processing module, configured to: perform predistortion processing on an input intermedi
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: September 11, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yanqing Zhao, Chunlei Yu, Tingjian Tian
  • Patent number: 10069659
    Abstract: Embodiments of a noise-shaping crest factor reduction method for a carrier signal (and a device that performs the method) include (a) clipping the carrier signal by selecting at least one carrier signal peak that has a magnitude exceeding a predetermined crest factor reduction threshold, (b) subtracting the resulting clipped signal from the carrier signal, (c) confining, by a noise shaping filter, the resulting clipping noise signal in a frequency band corresponding to that of the carrier signal, and (d) subtracting the resulting spectrally shaped clipping noise signal from a delayed version of the carrier signal. The confining process includes selecting first sub-areas of the noise shaping filter response at one or more guard bands, selecting at least one second sub-area of the noise shaping filter response elsewhere in the frequency band, and setting the first sub-areas to a first predetermined magnitude higher than the magnitude of the second sub-area.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: September 4, 2018
    Assignee: NXP USA, INC.
    Inventor: Vincent Martinez
  • Patent number: 10055372
    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: November 25, 2015
    Date of Patent: August 21, 2018
    Assignee: KANDOU LABS, S.A.
    Inventor: Amin Shokrollahi
  • Patent number: 10057096
    Abstract: A transmitting apparatus according to one aspect of the present disclosure transmits a plurality of first transmission data and a plurality of second transmission data by using an OFDM (Orthogonal Frequency-Division Multiplexing) method. The transmitting apparatus includes frame configuring circuitry, which in operation, generates a frame including a first period in which a preamble is transmitted, a second period in which the plurality of first transmission data is multiplexed by a time division multiplexing method and is transmitted, and a third period in which the plurality of second transmission data is multiplexed by a frequency division multiplexing method and is transmitted; and transmitting circuitry that transmits the frame.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: August 21, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 10050816
    Abstract: A user equipment, apparatus, and method are provided for wireless communication with at least one base station. The user equipment includes a transceiver configured to communicate with the at least one base station by transmitting radio frequency signals to the at least one base station and by receiving radio frequency signals from the at least one base station. The user equipment also includes processing circuitry. The processing circuitry is configured to identify an occupied signal bandwidth of the radio frequency signals. The processing circuitry is also configured to identify a spectral mask for the occupied signal bandwidth. The processing circuitry is also configured to identify an unused available spectrum between the occupied signal bandwidth and the spectral mask. The processing circuitry is also configured to modulate a spectral mask filling (SMF) signal in the unused available spectrum, the SMF signal configured to reduce the peak-to-average power ratio of the radio frequency signals.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: August 14, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sridhar Rajagopal, Shadi Abu-Surra
  • Patent number: 10033452
    Abstract: Provided is a frame configuration usable for both SISO transmission and MISO and/or MIMO transmission. A frame configurator of a transmission device configures a frame by gathering data for SISO and configures a frame by gathering data for MISO and/or MIMO data, thereby to improve the reception performance (detection performance) of a reception device.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: July 24, 2018
    Assignee: SUN PATENT TRUST
    Inventors: Mikihiro Ouchi, Yutaka Murakami, Tomohiro Kimura
  • Patent number: 10033445
    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 yi(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: March 6, 2017
    Date of Patent: July 24, 2018
    Assignee: SUN PATENT TRUST
    Inventors: Yutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
  • Patent number: 10027356
    Abstract: Devices and methods of compensating for a bandpass filter are generally described. A DTx includes a BPF from which an output signal is produced and a DFE having a zero crossing (ZC) pre-distorter (ZCPD). The ZCPD compensates for ZC distortion from a desired analog signal caused by the BPF. The ZCPD adjusts a DTC code word to generate a DTx output signal to be applied to the BPF. The compensation is dependent on a magnitude of the square wave immediately prior to and after the ZC. The compensated DTC and a DPA code word are used to generate the DTx output signal. The compensation produced by the ZCPD is free from compensation for non-linear responses to the DTC and DPA code words.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: July 17, 2018
    Assignee: Intel IP Corporation
    Inventors: Elan Banin, Uri Parker, Ofir Degani, Michael Kerner
  • Patent number: 10018707
    Abstract: A novel methodology for automatically linearizing a harmonic radar transmitter—termed Feed-Forward Filter Reflection (FFFR)—is disclosed. The method combines the reflected second harmonic from a filter with the signal passing directly through the filter. The second harmonic from these two paths are combined with equal and opposite amplitudes to reduce the second harmonic beyond filtering alone. This methodology has been experimentally verified at transmit frequencies between 800 and 1000 MHz. Implemented properly, the technique provides greater than 100 dB rejection between 1.6 and 2.0 GHz. Although the tuning has been automated, further optimization is possible. Automated tuning is demonstrated over 400 MHz of bandwidth with a minimum cancellation of 110 dB. One application for the harmonic cancellation is to create a linear radar transmitter for the remote detection of non-linear targets.
    Type: Grant
    Filed: May 4, 2015
    Date of Patent: July 10, 2018
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Gregory J. Mazzaro, Kyle A. Gallagher
  • Patent number: 10003390
    Abstract: Systems and methods of precoded faster than Nyquist (FTN) signalling are provided. In the transmitter, Tomlinson-Harashima Preceding (THP) is applied to produce precoded symbols. The THP is based on inter-symbol interference (ISI) due to using faster than Nyquist (FTN) signalling. An inverse modulo operation is not performed in the receiver. Instead, in the receiver, FTN processing is performed based on a matched filter output by determining log a-posteriori probability ratio LAPPR values computed for an nth bit bn of a kth received symbol and pre-computed a-priori probabilities of an extended constellation for a given pulse shape h(t) and FTN acceleration factor combination.
    Type: Grant
    Filed: November 2, 2016
    Date of Patent: June 19, 2018
    Assignee: HUAWEI TECHNOLOGIES CANADA CO., LTD.
    Inventors: Mrinmoy Jana, Jeebak Mitra, Lutz Hans-Joachim Lampe, Ahmed Mohamed Ibrahim Medra
  • Patent number: 10002658
    Abstract: A highly configurable, extremely dense, high speed and low power artificial neural network is presented. The architecture may utilize DRAM cells for their density and high endurance to store weight and bias values. A number of primary sense amplifiers along with column select lines (CSLs), local data lines (LDLs), and sense circuitry may comprise a single neuron. Since the data in the primary sense amplifiers can be updated with a new row activation, the same hardware can be reused for many different neurons. The result is a large amount of neurons that can be connected by the user. Training can be done in hardware by actively varying weights and monitoring cost. The network can be run and trained at high speed since processing and/or data transfer that needs to be performed can be minimized.
    Type: Grant
    Filed: November 2, 2016
    Date of Patent: June 19, 2018
    Assignee: Green Mountain Semiconductor Inc.
    Inventors: Wolfgang Hokenmaier, Ryan A. Jurasek, Donald W. Labrecque
  • Patent number: 9985741
    Abstract: The present invention discloses a method for adjusting parameters of a sending device and a receiving device, and a terminal device. In the method, a new precoding parameter that needs to be used by a sending device on a line when a precoding matrix in a downlink direction of the line changes, and a new signal recovery parameter that needs to be used by a receiving device and matches the new precoding parameter are first acquired; and then the new precoding parameter, the new signal recovery parameter, and a set moment and/or symbol at which the sending device starts to use the new precoding parameter are sent to the sending device, and the new signal recovery parameter and the set moment and/or symbol are sent to the receiving device by using the sending device.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: May 29, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Xiang Wang, Weiyang Wang
  • Patent number: 9985811
    Abstract: Disclosed herein is an apparatus and methodology for reducing peak-to-average-power ratio (PAPR) for IQ radio frequency digital-to-analog converter (RFDAC). Processing circuitry may be configured to generate a digital signal comprising an in-phase (I) signal component and a quadrature (Q) signal component having a peak-to-average-power-ratio (PAPR). The processing circuitry may determine the I signal component and the Q signal component are higher than a predetermined threshold value, and limit the I signal component and the Q signal component to be less than or equal to the predetermined threshold value. The processing circuitry may rotate the signal components to generate rotated signal components to reduce the PAPR based on the I and Q signal components having less than or equal to the predetermined threshold value, and may generate an output radio frequency (RF) signal based on the rotated signal components.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: May 29, 2018
    Assignee: Intel IP Corporation
    Inventors: Christian Mayer, Franz Kuttner
  • Patent number: 9966906
    Abstract: A radio apparatus includes an amplifier that amplifies electrical power of a signal that is wirelessly transmitted, and a processor that executes a process including: performing, by using a distortion compensation coefficient that compensates distortion generated in the amplifier, distortion compensation of an input signal; reading, from a predetermined memory, a threshold that varies in accordance with the electrical power of the input signal; and comparing the read threshold with a monitoring target which includes the distortion compensation coefficient used with respect to the input signal to monitor whether an abnormality is present in the distortion compensation of the input signal.
    Type: Grant
    Filed: April 25, 2017
    Date of Patent: May 8, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Akihiko Komatsuzaki, Satoshi Matsubara, Shinichiro Kobayashi, Hideharu Shako
  • Patent number: 9967123
    Abstract: The disclosure provides a circuit. The circuit includes an IFFT (inverse fast fourier transform) block. The IFFT block generates a modulated signal in response to a data signal. A clip logic block is coupled to the IFFT block, and generates a clipped signal in response to the modulated signal. A first subtractor is coupled to the clip logic block and the IFFT block, and subtracts the modulated signal from the clipped signal to generate an error signal. A cyclic filter is coupled to the first subtractor, and filters the error signal to generate a filtered error signal. A second subtractor is coupled to the cyclic filter and the IFFT block. The second subtractor subtracts the filtered error signal from the modulated signal to generate a processed signal.
    Type: Grant
    Filed: February 7, 2017
    Date of Patent: May 8, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Jaiganesh Balakrishnan, Sarma Sundareswara Gunturi, Pankaj Gupta, Indu Prathapan
  • Patent number: 9960942
    Abstract: The invention relates to a method for reducing the PAPR in FRFT-OFDM systems, which belongs to the field of broadband wireless digital communications technology. The method is based on fractional random phase sequence and fractional circular convolution theorem, which can effectively reduce the PAPR of the system. The method of the invention has the advantages of simple system implementation and low computational complexity. In this method, the PAPR of the system can be effectively reduced while maintaining the reliability of the system. When the number of candidate signals is the same, the PAPR performance of the present method was found to be almost the same as that of SLM and better than that of PTS. More importantly, the present method has lower computational complexity than that of SLM and PTS methods.
    Type: Grant
    Filed: January 9, 2017
    Date of Patent: May 1, 2018
    Assignee: Beijing Institute of Technology
    Inventors: Hao Huan, Ran Tao, Yue Zhao, Teng Wang
  • Patent number: 9960900
    Abstract: Methods and apparatus are provided for modeling of a physical system using two-dimensional look-up tables.
    Type: Grant
    Filed: March 31, 2014
    Date of Patent: May 1, 2018
    Assignee: Intel Corporation
    Inventor: Kameran Azadet
  • Patent number: 9954626
    Abstract: A method of calibrating parameters for a polar transmitter (Polar TX) system includes receiving phase information derived from transmission information in a Polar TX for producing a radio frequency (RF) broadcast signal. An Inphase local oscillator (LO_I) signal and a quadrature phase local oscillator (LO_Q) signal are derived from a combination of a first signal and the phase information using a digital phase lock loop. A feedback receiver (FBR) receives the RF broadcast signal provided by the Polar TX. The LO_I signal and the LO_Q signal are mixed with the RF broadcast signal to obtain mixer output signals. RF path delay and IQ phase imbalance are concurrently determined as a function of the first signal and of the mixer output signals.
    Type: Grant
    Filed: August 8, 2016
    Date of Patent: April 24, 2018
    Assignee: Intel IP Corporation
    Inventors: Alexander Belitzer, Bernhard Sogl
  • Patent number: 9923595
    Abstract: A signal processing circuit arrangement may include a preamplifier circuit configured to map a first dimension input and a second dimension input to a first subset of a plurality of lookup table coefficients of a two-dimensional (2D) lookup table, wherein the first dimension input and the second dimension input each represent a signal level of one or more input signals, extrapolate from the first subset of the plurality of lookup table coefficients to generate a lookup table output, and apply the lookup table output to the one or more input signals to generate a predistorted input signal for an amplifier.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: March 20, 2018
    Assignee: Intel Corporation
    Inventors: Albert Molina, Kameran Azadet
  • Patent number: 9923582
    Abstract: A high-frequency signal predistortion device includes a high-frequency signal estimator, a predistortion estimator, and a predistorter. The high-frequency signal estimator is configured to determine non-linear distortion characteristics of high-frequency signals transmitted by antennas. The predistortion estimator is coupled to the high-frequency signal estimator. The predistortion estimator is configured to determine a predistortion coefficient based on the non-linear distortion characteristics. The predistorter is coupled to the predistortion estimator. The predistorter is configured to distort a base signal of the high-frequency signals based on the predistortion coefficient.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: March 20, 2018
    Assignees: Samsung Electro-Mechanics Co., Ltd., Korea Advanced Institute of Science and Technology
    Inventors: Yong Hoon Lee, Sang Il Lee, Min Hyun Kim, Young Wook Sirl, Eui Rim Jeong, Soon Il Hong, Jong Ok Ha, Seong Jin Kim
  • Patent number: 9906428
    Abstract: A method and apparatus is provided. The method includes determining a training data set comprising input and output data of a power amplifier, determining compensation data by regressing the training data using a frequency domain weighting function, storing the compensation data, and linearizing an output of the power amplifier using the stored compensation data.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: February 27, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jaeyoung Kim, Pranav Dayal, Jungwon Lee
  • Patent number: 9876516
    Abstract: A method of suppressing interference in a communication sent over a channel includes assessing characteristics of channel-induced distortion in a channel, and applying pre-distortion to a signal sent over the channel. The pre-distortion is based on the assessed characteristics of the channel-induced distortion.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: January 23, 2018
    Assignee: Texas State University—San Marcos
    Inventor: Stan McClellan
  • Patent number: 9866303
    Abstract: The present invention relates to a wireless communication system and, more specifically, to a method and device for reporting channel state information (CSI). The method by which a terminal in a wireless communication system reports CSI, according to one embodiment of the present invention, can comprise the steps of: receiving a reference signal from a base station; and reporting, to the base station, the CSI generated by using the reference signal. The CSI can include at least one first domain precoding matrix indicator (PMI) indicating a first precoding matrix for a first domain of a two-dimensional antenna structure and at least one second domain PMI indicating a second precoding matrix for a second domain of the two-dimensional antenna structure. A reporting period of the at least one first domain PMI can be shorter than a reporting period of the at least one second domain PMI.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: January 9, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Hyunsoo Ko, Jiwon Kang, Jaehoon Chung
  • Patent number: 9866327
    Abstract: Since a sampling frequency of RRU is always constant, A/D conversion may be performed with a sampling frequency higher than necessary with respect to a frequency band width of a radio signal. A sampling frequency change function, and the sampling frequency is reduced in a range where a aliasing component does not deteriorate signal quality of a desired signal component when the sampling frequency is decreased, based on radio band allocation information, or signal transmission between BBU and RRU is stopped in a no signal section, whereby a band required for digital RoF transmission between the BBU and the RRU is reduced.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: January 9, 2018
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Naotaka Shibata, Seiji Yoshida, Shigeru Kuwano, Jun-ichi Kani, Jun Terada
  • Patent number: 9866269
    Abstract: A digital predistortion (DPD) system includes an input configured to receive a DPD input signal. The DPD system includes a first predistortion circuit configured to provide a first signal path coupled to the input to generate a first predistortion signal. The first predistortion circuit includes a first infinite impulse response (IIR) filter. A second predistortion circuit is configured to provide a second signal path coupled to the input in parallel with the first signal path to generate a second predistortion signal. The second predistortion circuit includes a second IIR filter. A combiner circuit is configured to combine the first predistortion signal and the second predistortion signal to generate a DPD output signal.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: January 9, 2018
    Assignee: XILINX, INC.
    Inventors: Hongzhi Zhao, Christopher H. Dick, Hemang M. Parekh
  • Patent number: 9866246
    Abstract: A digital transmitter channel optimization device can be employed within or in conjunction with a transmitter to perform a number of techniques in the digital domain to account for distortion introduced in the transmitter. The optimization device can be configured to perform such techniques on an arbitrary signal to thereby allow the optimization device to be used with virtually any transmitter. The optimization device may be particularly beneficial in wideband systems where accounting for distortion can be difficult to accomplish using existing techniques.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: January 9, 2018
    Assignee: L-3 Communications Corp.
    Inventors: June Y Sun, William K McIntire