Patents Examined by Jaison Joseph
  • Patent number: 10411938
    Abstract: How to apply an Alamouti like space-time coding (or transmit diversity) to a Filter Bank Multicarrier (FBMC) transmission using Offset QAM (OQAM). In FBMC, due to the orthogonality in the real domain only, an intrinsic interference results thereof for the imaginary component. Simply adapting the Alamouti scheme to FBMC OQAM is not obvious since the intrinsic interference terms are not equivalent at each antenna since it depends on the surrounding symbols. The application proposes to use a precoding symbol chosen to cancel out (zero) the intrinsic interference individually for each antenna, ie a code rate of 1/2 (sending one data symbol requires two time units). A more elaborated embodiment proposes to choose the contiguous precoding symbols such that a virtual QAM Alamouti scheme is achieved, without rate loss.
    Type: Grant
    Filed: April 1, 2016
    Date of Patent: September 10, 2019
    Assignee: NTT DOCOMO, INC.
    Inventors: Petra Weitkemper, Katsutoshi Kusume, Jamal Bazzi, Mikio Iwamura
  • Patent number: 10411656
    Abstract: A crest factor reduction (CFR) system includes a digital tilt filter coupled to an input of the CFR system. In some embodiments, the digital tilt filter is configured to receive a system input signal and generate a digital tilt filter output signal at a digital tilt filter output. In some examples, the CFR system further includes a CFR module coupled to the digital tilt filter output, where the CFR module is configured receive the digital tilt filter output signal and perform a CFR process to the digital tilt filter output signal to generate a CFR module output signal at a CFR module output. In addition, the CFR system may include a digital tilt equalizer coupled to the CFR module output, where the digital tilt equalizer is configured to receive the CFR module output signal and generate a system output signal.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: September 10, 2019
    Assignee: XILINX, INC.
    Inventors: Christopher H. Dick, Hongzhi Zhao, Hemang M. Parekh, Xiaohan Chen
  • Patent number: 10411934
    Abstract: A superposition coded orthogonal frequency division multiplexing system which sets forth a comprehensive solution and deals with factors such as peak-to average power ratio (PAPR), error performance enhancement, data rate increase, synchronization or channel estimation and multi input and output (MIMO), using a joint system.
    Type: Grant
    Filed: October 11, 2018
    Date of Patent: September 10, 2019
    Inventors: Selahattin Gokceli, Gunes Zeynep Karabulut Kurt
  • Patent number: 10411744
    Abstract: A method for transforming and reconstructing a signal includes receiving a plurality of samples of a waveform of the signal at different points in time. The waveform of the signal is transformed, for each sample, into an in-phase (I) component and a quadrature (Q) component. A derotational circuit applies a delayed complex conjugate multiple (DCM) to the signal to determine a constant product having an I component (Ic) and a Q component (Qc). A magnitude component is determined based on Ic and Qc. A delta phase component is determined based on Ic and Qc. The magnitude component is processed to create a processed magnitude component. The delta phase component is processed to create a processed delta phase component. An IQ waveform is created by reconstructing the waveform of the signal based on the processed magnitude component and the processed phase component.
    Type: Grant
    Filed: October 11, 2018
    Date of Patent: September 10, 2019
    Assignee: Ratheon Company
    Inventors: David B. Wilson, Loyra G. Dirzo, Jose A. Ruvalcaba
  • Patent number: 10411933
    Abstract: An apparatus and method for generating a broadcast signal frame including preamble for signaling injection level information. An apparatus for generating broadcast signal frame according to an embodiment of the present invention includes an injection level controller configured to generate a power reduced enhanced layer signal by reducing a power of an enhanced layer signal; a combiner configured to generate a multiplexed signal by combining a core layer signal and the power reduced enhanced layer signal; a power normalizer configured to reduce the power of the multiplexed signal to a power level corresponding to the core layer signal; a time interleaver configured to generate a time-interleaved signal by performing interleaving that is applied to both the core layer signal and the enhanced layer signal; and a frame builder configured to generate a broadcast signal frame including a preamble for signaling injection level information corresponding to the injection level controller.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: September 10, 2019
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung-Ik Park, Jae-Young Lee, Sun-Hyoung Kwon, Heung-Mook Kim
  • Patent number: 10404518
    Abstract: The present application discloses a communications method and apparatus. The method includes: determining a radio frame, where the radio frame includes a period, the period includes at least one first sub-period and at least one second sub-period, the first sub-period corresponds to a first procedure, and the second sub-period corresponds to a second procedure; the first sub-period includes n first time slices, different beams are used in adjacent first time slices in the n first time slices, there is a first guard interval between the adjacent first time slices, and the second sub-period includes m second time slices; and at least one first time slice is adjacent to at least one second time slice and there is no guard interval between the at least one first time slice and the at least one second time slice that are adjacent to each other; and performing communication by using the radio frame.
    Type: Grant
    Filed: August 1, 2018
    Date of Patent: September 3, 2019
    Inventors: Kun Zeng, Huang Huang, Guangjian Wang
  • Patent number: 10404492
    Abstract: A device for mitigating a first group delay of a lowpass filter configured to lowpass filter a first channel coefficient of a set of channel coefficients with respect to time, includes a prediction filter configured to filter a data sequence derived from a lowpass filtered first channel coefficient to generate a prediction value of the lowpass filtered first channel coefficient; and an adjustment circuitry configured to adjust the prediction filter to generate the prediction value having a second group delay that is less than the first group delay.
    Type: Grant
    Filed: August 17, 2016
    Date of Patent: September 3, 2019
    Assignee: Intel IP Corporation
    Inventor: Michael Ruebsamen
  • Patent number: 10396936
    Abstract: A receiver for receiving a radio frequency (RF) signal that comprises a carrier signal modulated with a baseband symbol. The receiver includes a plurality of spatially-distributed antennas to receive the RF signal; a local reference signal generator configured to generate a local reference signal; a plurality of power couplers, each power coupler having a first input connected to a respective one of the antennas to receive a respective version of the RF signal, a second input connected to the local reference signal generator to receive the local reference signal, and an output to output a corresponding coupled signal; and a differentiator circuit connected to the power coupler outputs for determining a power differential between at least one pair of the coupled signals to recover the baseband symbol from the RF signal.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: August 27, 2019
    Inventors: Bilel Mnasri, Ke Wu, Tarek Djerafi, Serioja Ovidiu Tatu
  • Patent number: 10389555
    Abstract: A technique includes determining a first phase delay associated with communication of a bit pattern having a first bit transition frequency over a communication channel; and determining a second phase delay associated with communication of a bit pattern having a second bit transition frequency greater than the first bit transition frequency over the communication channel. The technique includes regulating a compensation applied to a signal received from the communication channel based at least in part on a difference of the first and second phase delays.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: August 20, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Dacheng Zhou, Daniel Alan Berkram, Peter David Maroni
  • Patent number: 10382047
    Abstract: A system for optimum phase searching in an Ethernet physical layer includes a time recovering circuit and an equalizer. The time recovering circuit includes a loop filter and a time error detector, and the equalizer includes a feed forward equalizer, a slicer and a feed backward equalizer. An optimum phase searching method includes obtaining optimum phases when mean squared errors calculated by the slicer are less than a first threshold, absolute values of mean values of outputs calculated by a time error detector are less than a second threshold, and the outputs are monotonic.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: August 13, 2019
    Inventor: Rong-yun Li
  • Patent number: 10367560
    Abstract: A data processing apparatus and a data processing method are provided. The method includes inputting q data streams, where each data stream includes Msymb complex-valued modulation symbols of one code word, and q and Msymb are integers greater than or equal to 1. The method also includes determining an l×l matrix used by the Msymb complex-valued modulation symbols included in each data stream, where the l×l matrix is one of an l×l identity matrix and a circulant matrix of the l×l identity matrix, and l is a quantity of transport layers. Additionally, the method includes performing, by using the determined l×l matrix, layer permutation mapping on the Msymb complex-valued modulation symbols included in each data stream.
    Type: Grant
    Filed: January 30, 2018
    Date of Patent: July 30, 2019
    Inventors: Lei Huang, Dageng Chen, Xiaoyan Bi
  • Patent number: 10361748
    Abstract: Disclosed herein is a multi-stage echo cancellation scheme. The disclosed embodiments include an apparatus and method for monitoring and canceling echoes greater than 25 dB in a coaxial cable plant. The method includes obtaining echo channel estimate coefficients from a cable node. The method determines a location and strength of each partial echo in an impulse response using the echo channel estimate coefficients. Optionally, the method determines a frequency response of each partial echo in the impulse response.
    Type: Grant
    Filed: January 15, 2018
    Date of Patent: July 23, 2019
    Assignee: Futurewei Technologies, Inc.
    Inventors: Xiaolong Zhang, Fan Wang, Tao Ouyang, Li Zhang, James Jeng Chen
  • Patent number: 10361794
    Abstract: Aspects of the subject disclosure may include, a system that obtains a group of signals that are each representative of a corresponding one of a group of electromagnetic waves, analyzes the group of signals to determine signal characteristics, and determines, according to the signal characteristics, predicted characteristics for a communication signal that is to be transmitted by a circuit. Other embodiments are disclosed.
    Type: Grant
    Filed: June 14, 2018
    Date of Patent: July 23, 2019
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Giovanni Vannucci, Peter Wolniansky, Paul Shala Henry, Robert Bennett, Farhad Barzegar, Irwin Gerszberg, Donald J. Barnickel, Thomas M. Willis, III
  • Patent number: 10356439
    Abstract: Flexible frame referencing is described that is suitable for use with a display transport. In one example, the referencing is a method that includes receiving frames at a computer system for transmission to a display, sending frames to the display without inter-frame compression in an intra-frame mode, saving the sent frames to a reference frame list, switching the computer system to an inter-frame mode, selecting a reference frame from the reference frame list, compressing additional received frames using the selected reference frame, and sending the additional frames to the display compressed in the inter-frame mode.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: July 16, 2019
    Assignee: Intel Corporation
    Inventors: Jason Tanner, Paul S. Diefenbaugh
  • Patent number: 10341997
    Abstract: Disclosed are a method and a device for transmitting uplink control information (UCI) by a terminal in a wireless communication system. The UCI transmission method comprises the steps of: generating an encoding information bit stream by performing channel coding for a UCI bit stream; generating complex modulation symbols by performing modulation for the generated encoding information bit stream; spreading the complex modulation symbols in block-wise on the basis of an orthogonal sequence; and transmitting the spread complex modulation symbols to a base station. The encoding information bit stream is generated by a channel coding for circularly repeating the UCI bit stream.
    Type: Grant
    Filed: January 4, 2018
    Date of Patent: July 2, 2019
    Inventors: Seung Hee Han, Ji Woong Jang, Jae Hoon Chung, Han Gyu Cho, Yeong Hyeon Kwon, Seung Hyun Kang
  • Patent number: 10341044
    Abstract: Embodiments of the application provide a method for encoding data in a wireless communication network. A communication device obtains K data bits and a target code length M. The device determines a mother code length N1. The device encodes the K data bits to obtain an encoded bit sequence of code langth N1. The mother code length N1 is determined according to a minimum value of values Na, Nmax and N. The values Na, Nmax and N satisfy the following conditions: (1) the value Na satisfies with: a rate R1 is less than or equal to a preset rate, wherein the rate R1 is determined according to the value K and the value Na; (2) the value Nmax is a preset maximum mother code length, and Nmax is an integer power of 2; and (3) the value N satisfies with M?N*(1+?), and ? is a preset constant.
    Type: Grant
    Filed: December 18, 2018
    Date of Patent: July 2, 2019
    Inventors: Gongzheng Zhang, Hejia Luo, Rong Li, Ying Chen, Yunfei Qiao
  • Patent number: 10333639
    Abstract: A digital synthesis channelizer includes a memory buffer and circuitry. The memory buffer stores samples of N input signals having a sampling rate Fsi. The N input signals are processed, prior to storing in the memory buffer, by an N-point time-frequency transform module. The circuitry includes at least P filters derived from a Low-Pass Filter whose stopband frequency depends on Fsi. The circuitry is configured to set a sampling time according to a predefined output sampling rate Fso=?·Fsi, ? being a predefined rate-conversion ratio, to select based on the sampling time one or more filters out of the at least P filters, and using the selected one or more filters, to generate, from at least some of the samples in the memory buffer, a filtered and interpolated output sample of an output signal that sums N digitally resampled by ? and frequency-shifted versions of the respective N input signals.
    Type: Grant
    Filed: May 9, 2018
    Date of Patent: June 25, 2019
    Assignee: CAPACICOM LTD.
    Inventors: Avihay Sadeh-Shirazi, Ronen Mayrench, Nitzan Ron, Ariel Yagil, Naor Goldman, Daniel Wajcer
  • Patent number: 10320443
    Abstract: A signal transmission system comprising a power amplifier, configured to amplify a signal; an antenna port, controllably connectable by a switch in series to an output of the power amplifier, and configured to be coupled to an antenna; a load component, controllably connectable by the switch in series to the output of the power amplifier; wherein the switch is disposed between the power amplifier and the antenna port and the load, to selectively connect the load component or the antenna port to the power amplifier according to a first operational mode and a second operational mode, and wherein the first operational mode is a mode in which the power amplifier is electrically connected to the antenna port and disconnected from the load component, and the second operational mode is a mode in which the power amplifier is electrically connected to the load component and disconnected from the antenna port.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: June 11, 2019
    Inventors: Cornelius Claussen, Markus Mack, Jens Schaub
  • Patent number: 10320340
    Abstract: Various examples are directed to a digital predistortion (DPD) circuit comprising a DPD actuator circuit, a DPD feedback frequency-shaping filter, a basis matrix generator circuit, a basis matrix frequency-shaping filter, and a DPD adaption circuit. The DPD actuator circuit may generate a predistorted signal based at least in part on an input signal and a set of frequency-shaped DPD parameters. The DPD feedback frequency-shaping filter may filter a DPD feedback signal to generate a frequency-shaped DPD feedback signal. A passband of the DPD feedback frequency-shaping filter may include substantially all of a bandwidth of the input signal and exclude a distortion term outside the bandwidth of the input signal. The basis matrix generator may generate a basis matrix based at least in part on a power amplifier feedback signal The basis matrix frequency-shaping filter may generate a frequency-shaped basis matrix based at least in part on the basis matrix.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: June 11, 2019
    Assignee: Analog Devices Global Unlimited Company
    Inventors: Patrick Pratt, David Jennings
  • Patent number: 10305609
    Abstract: Systems, methods, and computer-readable media for receiver channel calibration are provided. The method includes generating a plurality of calibration signals corresponding to a plurality of receiver channels, respectively, of a receiver module. The plurality of calibration signals are propagated through at least portions of the plurality of receiver channels, respectively. At least two signal characteristics of at least two of the propagated plurality of calibration signals are compared. At least one adjustment in gain, phase, or timing for at least one of the plurality of receiver channels is identified based on a result of the comparing. Based on the identified adjustment, a data signal received via the at least one of the plurality of receiver channels is adjusted.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: May 28, 2019
    Assignee: LOON LLC
    Inventors: Pascal Stang, Sharath Ananth