Patents Examined by Gina McKie
  • Patent number: 10326533
    Abstract: A method and structure for equalization in coherent optical receivers. Block-based LMS (BLMS) algorithm is one of the many efficient adaptive equalization algorithms used to (i) increase convergence speed and (ii) reduce implementation complexity. Since the computation of the equalizer output and the gradient of the error are obtained using a linear convolution, BLMS can be efficiently implemented in the frequency domain with the constrained frequency-domain BLMS (FBLMS) adaptive algorithm. The present invention introduces a novel reduced complexity constrained FBLMS algorithm. This new approach replaces the two discrete Fourier transform (DFT) stages required to evaluate the DFT of the gradient error, by a simple frequency domain filtering. Implementation complexity can be drastically reduced in comparison to the standard constrained FBLMS. Furthermore, the new approach achieves better performance than that obtained with the unconstrained FBLMS in ultra-high speed coherent optical receivers.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: June 18, 2019
    Assignee: INPHI CORPORATION
    Inventors: Mario R. Hueda, NĂ©stor D. Campos
  • Patent number: 10277443
    Abstract: Disclosed is a technique related to a method and apparatus for generating a preamble and a data frame for wireless communication, and to a synchronization estimation method using the preamble. According to the technique, a method for generating a frame for wireless communication is disclosed, wherein the method comprises: a step of generating a modified sequence using a first base sequence for synchronization estimation; and a step of allocating the first base sequence and the modified sequence to the frequency domain of a first timeslot to generate a preamble. The modified sequence includes a complex conjugated sequence of the first base sequence or a sequence having a code different from that of the first base sequence.
    Type: Grant
    Filed: August 23, 2010
    Date of Patent: April 30, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Kapseok Chang, Wooyong Lee, Hyun-Kyu Chung
  • Patent number: 10250303
    Abstract: The invention provides a selection circuit and method of multiple input/output ports and antenna sub-arrays for reconfigurable hybrid beamforming. The selection circuit includes a plurality of digital signal processing modules, each electrically connected to a respective input/output port, a plurality of analog front end (AFE) and radio frequency (RF) chains, each electrically connected to a respective digital signal processing module, a plurality of multiplexing circuits, each electrically connected to any number of the AFE and RF chains, and a plurality of antenna sub-arrays, each electrically connected to a respective multiplexing circuit, wherein the multiplexing circuits set any number of the antenna sub-arrays to transmit/receive any number of electrical signals of input/output ports transmitted by the AFE and RF chains.
    Type: Grant
    Filed: May 11, 2017
    Date of Patent: April 2, 2019
    Assignees: NATIONAL TAIWAN UNIVERSITY, MEDIATEK INC.
    Inventor: Sau-Hsuan Wu
  • Patent number: 10230427
    Abstract: A method for direct current power line communication in a photovoltaic system includes (a) transferring power between a photovoltaic device and a load using a power line, (b) detecting a change in operation of the power line, and (c) in response to the detected change in operation of the power line, decoding operating state of the power line to obtain information. A method for direct current power line communication in a photovoltaic system includes (a) transferring power between a photovoltaic device and a load using a power line, (b) changing operation of the power line, and (c) encoding operating state of the power line to represent information to be communicated.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: March 12, 2019
    Assignee: Maxim Integrated Products, Inc.
    Inventor: Seth M. Kahn
  • Patent number: 10193723
    Abstract: The present invention relates to a method of transmitting and a method of receiving signals, and corresponding apparatus. One aspect of the present invention relates to a method of obtaining a field for indicating a time de-interleaving depth from a layer 1 (L1) header of preamble symbols.
    Type: Grant
    Filed: May 1, 2017
    Date of Patent: January 29, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Woo Suk Ko, Sang Chul Moon
  • Patent number: 10187133
    Abstract: A system and machine-implemented method are described for adjusting communication with a first distributed-input-distributed-output (DIDO) client. For example, a method according to one embodiment of the invention comprises: applying DIDO weights to one or more data streams to generate one or more DIDO precoded data streams; receiving input channel quality information (CQI) and/or channel state information (CSI) related to DIDO communication channels over which the DIDO precoded data streams are to be transmitted; determining a power scaling factor based on the CQI and/or CSI; and applying the power scaling factor to each of the DIDO precoded data streams.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: January 22, 2019
    Assignee: REARDEN, LLC
    Inventors: Antonio Forenza, Stephen G. Perlman
  • Patent number: 10158510
    Abstract: A method and an apparatus for transmitting broadcast signals thereof are disclosed.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: December 18, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Jaeho Hwang, Woosuk Ko, Sungryong Hong, Jongwoong Shin, Jinwoo Kim
  • Patent number: 10158509
    Abstract: Systems and methods are provided for aligning amplitude and phase signals in a polar receiver. A receiver generates digital amplitude and phase signals representing the amplitude and phase of a modulated input signal. At least one of the digital signals is filtered using a fractional delay filter with a variable delay. The delay of the fractional delay filter is adjusted to align the amplitude and phase signals. In some embodiments, an error vector magnitude is determined by comparing in-phase and quadrature values of the signal with values corresponding to a constellation point, and the delay is adjusted based on the error vector magnitude. The fractional delay filter may be a finite impulse response filter with coefficients stored in a lookup table that correspond to different delays.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: December 18, 2018
    Assignee: Innophase Inc.
    Inventors: Yang Xu, Sara Munoz Hermoso
  • Patent number: 10158405
    Abstract: Interference alignment for a multiple-input multiple-output communications network with partial connectivity is provided. A method is provided that includes determining assignments for data streams transmitted in the multiple-input multiple-output communications network. The method also includes suppressing inter-cell interference and suppressing intra-cell interference. Also provided is inter-cell/intra-cell decomposition and exploitation of partial connectivity in a multiple-input multiple-output communications network. The multiple-input multiple-output communications network can comprise three or more cells.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: December 18, 2018
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Liangzhong Ruan, Vincent Kin Nang Lau, Xiongbin Rao
  • Patent number: 10142003
    Abstract: Embodiments of the present invention provide a precoding information obtaining apparatus. The apparatus includes: a determining module, configured to determine a transformation quantity according to a steering vector of an antenna form and a departure-angle range; a sending module, configured to send, to a terminal, information about the transformation quantity determined by the determining module, where the information about the transformation quantity is used by the terminal to determine a PMI according to the information about the transformation quantity, a codebook used for obtaining channel information, and a pilot measurement result; and a receiving module, configured to receive the PMI reported by the terminal. A network node sends a transformation quantity containing antenna information to a terminal, and the terminal feeds back a PMI according to the transformation quantity.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: November 27, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Xiaoyan Bi, Dageng Chen
  • Patent number: 10135600
    Abstract: There is disclosed herein multiplexer circuitry. In particular, there is disclosed a latch circuit for use as a multiplexer to multiplex information carried by respective pairs of input information signals onto an output information signal, each pair of input information signals comprising a first input information signal and a second input information signal, and each pair of input information signals carrying information values based on signal values of those input information signals and interleaved with information values carried by the other pair or pairs of input information signals.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: November 20, 2018
    Assignee: SOCIONEXT INC.
    Inventors: Darren Walker, Ian Juso Dedic
  • Patent number: 10135663
    Abstract: An FBMC signal transmitting method and receiving method, a transmitter, and a receiver are provided. The transmitting method includes: generating offset quadrature amplitude modulation OQAM symbols included on at least two subbands; mapping an OQAM symbol on each subband onto a respective subcarrier to obtain a frequency-domain signal, where a first frequency interval exists between adjacent subcarriers in a same subband, a second frequency interval exists between adjacent subcarriers that belong to two adjacent subbands, the second frequency interval is a sum of the first frequency interval and a guard band interval, and the guard band interval is a fractional multiple of the first frequency interval; generating an FBMC signal out of the frequency-domain signal; and transmitting the FBMC signal to a receiver.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: November 20, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Daiming Qu, Tao Jiang, Jun Li, Lei Chen
  • Patent number: 10135643
    Abstract: An embodiment includes a first feedback tap, a second feedback tap, and a summation circuit. The summation circuit may include a first load and a second load coupled to each other at an internal circuit node, and coupled in series between a power supply node and an output node. The summation circuit may be configured to receive, via a serial communication link, an input signal indicative of a series of data symbols, and to generate an output voltage level on the output node based upon a current data symbol. The first feedback tap, coupled to the output node, may be configured to sink a first current from the output node based upon a first previously received data symbol. The second feedback tap, coupled to an intermediate circuit node, may be configured to sink a second current from the intermediate circuit node based upon a second previously received data symbol.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: November 20, 2018
    Assignee: Oracle International Corporation
    Inventors: Long Kong, Ranjan Vaish, Muthukumar Vairavan, Zuxu Qin
  • Patent number: 10135654
    Abstract: A method for transmitting a synchronization signal by a transmitting side device to a receiving side device in a wireless access system. The method includes generating a concatenated code sequence in a frequency domain by concatenating a first code sequence having a first index (M1) and a second code sequence having a second index (M2). Each of the first code sequence and the second code sequence is obtained by cyclic shifting a code sequence. The concatenated code sequence is mapped to subcarriers for transmitting the synchronization signal via a secondary synchronization channel (S-SCH). The method further includes transforming the concatenated code sequence into a time domain signal; and transmitting the time domain signal to the receiving side device as the synchronization signal. The concatenated code sequence indicates a cell group identity (ID).
    Type: Grant
    Filed: October 7, 2014
    Date of Patent: November 20, 2018
    Assignee: LG ELECTRONICS INC.
    Inventors: Seung Hee Han, Min Seok Noh, Yeong Hyeon Kwon
  • Patent number: 10127167
    Abstract: System, methods and apparatus are described that facilitate transmission of data, particularly between two devices within an electronic apparatus. Information is transmitted in N-phase polarity encoded symbols. Drivers may be adapted or configured to align state transitions on two or more connectors in order to minimize a transition period between consecutive symbols. The drivers may include circuits that advance or delay certain transitions. The drivers may include pre-emphasis circuits that operate to drive the state of a connector for a portion of the transition period, even when the connector is transitioned to an undriven state.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: November 13, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Chulkyu Lee, George Alan Wiley
  • Patent number: 10103928
    Abstract: Nyquist filters for pulse shaping and related matched filters in wireless communications are disclosed that provide improved performance. The disclosed embodiments recognize that the second derivative of the raised cosine function is discontinuous in the frequency domain and that the first derivative of the square root raised cosine is discontinuous in the frequency domain. As such, a generalization for the raised cosine filter is applied, and improvements can be made to the raised cosine function time-frequency localization and ultimately to tradeoffs between inter-symbol interference and adjacent channel interference by introducing smoothness to the higher order derivatives of the frequency response.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: October 16, 2018
    Assignee: National Instruments Corporation
    Inventors: James Wesley McCoy, Lothar Wenzel
  • Patent number: 10103697
    Abstract: A multiphase transmitter including a reactive combiner for combining amplified pulse modulated signals generated by multiple power amplifiers of the transmitter. In some embodiments, the reactive combiner is configured to inhibit odd order harmonics of the amplified pulse modulated signals in a power efficient manner.
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: October 16, 2018
    Assignee: NXP USA, INC.
    Inventors: Chun-Wei Chang, Joseph Staudinger
  • Patent number: 10097239
    Abstract: Systems and methods are provided for constructing a physical transmission line system. Characteristic data associated with a transmission line system is received. A model of the transmission line system is built based on the characteristic data. Building a model of the transmission line system includes determining a characteristic admittance matrix based on the characteristic data, determining a propagation function matrix based on the characteristic data, calculating a linking matrix based on the characteristic admittance matrix and the propagation function matrix, and determining a state space model based on the characteristic admittance matrix and the linking matrix. A simulation is performed using the state space model to determine a physical characteristic, where the transmission line system is built or modified based on the simulation-determined physical characteristic.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: October 9, 2018
    Assignee: Ansys, Inc.
    Inventors: Michael J. Tsuk, Jacob K. White, J. Eric Bracken
  • Patent number: 10084632
    Abstract: Embodiments include a system, method, and computer program product that receives an Orthogonal Frequency Division Multiplexing (OFDM) symbol, and utilizes a weighted gradient-based adaptive peak cancellation convergence algorithm to create a peak cancellation signal to reduce a peak-to-average power ratio (PAPR) as well as induced error rates of the OFDM symbol. Iterations of the weighted gradient-based adaptive peak cancellation convergence algorithm produce a peak cancellation signal that converges to a desired peak cancellation signal that satisfies a targeted PAPR. Some embodiments utilize a priori knowledge of a power spectral density of clipping noise and pre-defined transmission constraints in the frequency domain to create a peak cancellation signal with specific and desired spectral density properties.
    Type: Grant
    Filed: July 10, 2017
    Date of Patent: September 25, 2018
    Assignee: Apple Inc.
    Inventor: Zohar Agon
  • Patent number: 10079709
    Abstract: In a method for generating a data unit, it is determined whether the data unit is to be transmitted using single carrier (SC) modulation or orthogonal frequency division (OFDM) modulation. When it is determined that the data unit is to be transmitted using SC modulation, a header field of the data unit is generated using a first technique to indicate that the data unit conforms to a first protocol and/or whether the data unit conforms to a first PHY mode or a second PHY mode of the first protocol. When it is determined that the data unit is to be transmitted using OFDM modulation, the header field is generated using a second technique to indicate that the data unit conforms to the first protocol and/or whether the data unit conforms to the first PHY mode or the second PHY mode of the first protocol.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: September 18, 2018
    Assignee: Marvell World Trade Ltd.
    Inventors: Yakun Sun, Hongyuan Zhang, Hui-Ling Lou, Kwok S. Au