Patents Examined by Betsy Deppe
  • Patent number: 11171817
    Abstract: Methods related to wireless communication systems and reducing peak-to-average-power ratio (PAPR) in MU-MIMO transmissions are provided. A base station (BS) generates a plurality of communication signals including data for a plurality of user equipment (UE) devices in a plurality of serving beam subspaces. The BS may also generate a peak-to-average-power ratio (PAPR) reduction signal for one or more of the plurality of communication signals. A first portion of the PAPR reduction signal is in a first serving beam subspace of the plurality of serving beam subspaces based on a first error vector magnitude (EVM) associated with a first UE of the plurality of UEs. A second portion of the PAPR reduction signal is in a non-serving beam subspace. The BS may also transmit, to the plurality of UEs, the plurality of communication signals and the PAPR reduction signal. Other features are also claimed and described.
    Type: Grant
    Filed: April 15, 2020
    Date of Patent: November 9, 2021
    Assignee: QUALCOMM Incorporated
    Inventors: Noam Zach, Guy Wolf, Sharon Levy, Ory Eger, Assaf Touboul
  • Patent number: 11165480
    Abstract: This application provides a data transmission method and apparatus. The method includes: receiving, by a terminal device, a first reference signal sent by a network device; measuring, by the terminal device, a downlink channel based on the first reference signal, to obtain a channel status of the downlink channel; determining, by the terminal device, a target mode from a plurality of modes based on the channel status of the downlink channel, where information that is used to feed back channel state information (CSI) and that is sent by the terminal device in different modes of the plurality of modes is different; and sending, by the terminal device, indication information to the network device, where the indication information is used to indicate the target mode. The data transmission method and apparatus in the embodiments of this application are conducive to improve flexibility of feeding back CSI.
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: November 2, 2021
    Inventors: Huangping Jin, Xiaoyan Bi, Min Zhang, Wei Han
  • Patent number: 11133920
    Abstract: A display device including: a timing controller outputting a reference clock signal and a data packet, wherein the data, packet includes a clock signal embedded in a data signal; a clock and data recovery (CDR) circuit receiving the reference clock signal and the data packet; and a display panel displaying an image based on the data packet, wherein, when the CDR circuit receives the reference clock signal, a frequency band of the reference clock signal is detected using a first internal clock signal, a parameter associated with jitter characteristics of the clock and data recovery circuit is adjusted according to the detected frequency band, and a second internal clock signal is output by adjusting a frequency of the first internal clock signal and when the CDR circuit receives the data packet, the data signal and a clock signal synchronized with the data signal are recovered from the data packet.
    Type: Grant
    Filed: May 20, 2020
    Date of Patent: September 28, 2021
    Inventors: Jungpil Lim, Kyungho Ryu, Kilhoon Lee, Hyunwook Lim
  • Patent number: 11050593
    Abstract: Disclosed herein are a synchronization apparatus and method for a upstream system. The synchronization apparatus for a upstream system includes one or more processors, and execution memory for storing at least one program that is executed by the one or more processors, wherein the at least one program is configured to receive a signal and calculate a first channel estimation value for the received signal using a predefined pilot, and calculate a second channel estimation value using a predefined complementary pilot and the first channel estimation value.
    Type: Grant
    Filed: May 4, 2020
    Date of Patent: June 29, 2021
    Inventors: Kwan-Woong Ryu, Jin-Hyuk Song, Joon-Young Jung, Dong-Joon Choi
  • Patent number: 11025358
    Abstract: A method of mitigating interference in a wireless signal of interest (SOI) received on an active frequency channel due to a common template multi-channel jamming attack includes selecting at least one reference channel from among a plurality of monitored frequency channels in which correlated jamming patterns are present without the SOI. The method further includes generating a plurality of weights according to data obtained from the active and reference channels, and applying an adaptive digital filter to the active channel according to the generated weights. The monitored frequency channels can be centered about the active frequency channel. The selection of reference channels can be varied and optimized. The data from each reference channel can be used to create a single virtual antenna tap or a plurality thereof. Assignment of the active channel can be time-varied to match a hopping pattern of a frequency hopping SOI.
    Type: Grant
    Filed: April 20, 2020
    Date of Patent: June 1, 2021
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: Jonathan P. Beaudeau
  • Patent number: 11005691
    Abstract: A method (50) for estimating a frequency shift and a frequency drift affecting a useful signal including a code word formed by a channel encoder, including an analysis phase (51) including: for two analysis frequency drifts: a compensation (52) of the analysis frequency drift on the useful signal, an estimation (53) of the frequency shift on each useful signal obtained after compensation, a selection (54) of frequency hypotheses, and an estimation phase (55) including: for each frequency hypothesis: a frequency recalibration (56) of the useful signal depending on the frequency hypothesis, in order to obtain sample sequences, an evaluation (57) of the probability of each sample sequence to be a code word of said channel encoder, an estimation (58) of the frequency shift and of the frequency drift depending on the most probable frequency hypothesis.
    Type: Grant
    Filed: October 22, 2018
    Date of Patent: May 11, 2021
    Inventors: Benjamin Gadat, Mehdi Anteur
  • Patent number: 11005688
    Abstract: Implementations provide a receiver circuit that includes: an alternate current (AC)-coupling network to filter an input signal, the AC-coupling network including a first RC filter connected between a first input node and a first common node and a second RC filter connected between a second input node and the first common node; a differential amplifier coupled to the AC-coupling network and configured to receive a filtered input signal from the AC-coupling network and generate an output signal, the differential amplifier including a differential pair of transistors and a common-mode measurement network coupled to source terminals of a first and a second transistors in the differential pair; and a first operational amplifier having an input coupled to output terminal of the common-mode measurement network and an output coupled to the first common node.
    Type: Grant
    Filed: August 21, 2019
    Date of Patent: May 11, 2021
    Assignee: Analog Bits Inc.
    Inventor: Mohammad Mahdi Ahmadi
  • Patent number: 10998987
    Abstract: Intra-array pilot measurements are performed with an antenna array of a MIMO transceiver. The antenna array comprises N transceive antennas. The antenna array is partitioned into K groups of antennas, Gk, k=1, . . . , K, wherein K?2, each group Gk comprising Nk antennas, Aki, i=1, . . . , Nk, of the antenna array. For each k=1, . . . , K, Sk pilot measurements, Mks, s=1, . . . , Sk, are performed, wherein Sk?1 and wherein each pilot measurement Mks comprises transmitting simultaneously by each antenna Aki, i=1, . . . , Nk, of the group Gk a pilot signal Pkis and generating by each antenna Ak?i?, i?=1, . . . , Nk?, of the other groups, Gk?, k??k, a received signal Ykk?i?s by receiving the pilot signals Pkis transmitted by the antennas Aki, i=1, . . . , Nk. The measurements can be performed in a mode for detecting whether current hardware impairment parameters are valid or in a mode for updating the hardware impairment parameters.
    Type: Grant
    Filed: September 16, 2019
    Date of Patent: May 4, 2021
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Alexis Decurninge, Maxime Guillaud, Xiwen Jiang, Florian Kaltenberger
  • Patent number: 10992503
    Abstract: A transceiver includes a receive circuit configured to receive an incoming signal and recover a reference signal at a reference frequency from the incoming signal. The incoming signal is a wireless packet. A first oscillator generates a signal at a set of predetermined frequencies. A first phase lock loop (PLL) interfaced with the first oscillator. The first PLL is configured to adjust a first oscillator frequency of the first oscillator based on an incoming frequency of the incoming signal using the reference frequency. A transmit circuit includes a second oscillator configured to generate a carrier signal at a predetermined frequency and a modulator configured to modulate data over the carrier signal at the predetermined frequency. The transmit circuit includes a second PLL interfaced with the second oscillator that sets the second oscillator to generate the carrier signal at the predetermined frequency using the reference signal. The transmit circuit transmits the modulated carrier signal.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: April 27, 2021
    Inventors: David D. Wentzloff, Abdullah Mohammed G Alghaihab, Xing Chen, Yao Shi
  • Patent number: 10985901
    Abstract: A synchronisation symbol detector that comprises two correlation modules and a comparison module. The first correlation module performs one or more correlations between the input signal and a down-converted version of the input signal and generates a first correlation metric from the one or more first correlations. The second correlation module performs one or more second correlations between the input signal and an up-converted version of the input signal and generates a second correlation metric from the one or more second correlations. The comparison module is configured to compare the first correlation metric and the second correlation metric and determine whether the input signal comprises a synchronisation symbol based on the comparison.
    Type: Grant
    Filed: June 29, 2019
    Date of Patent: April 20, 2021
    Assignee: Imagination Technologies Limited
    Inventors: Filipe Carvalho, Taku Yamagata
  • Patent number: 10931339
    Abstract: Disclosed are a method and device for determining an uplink transmission codebook. The method includes: transmitting by the terminal data transmission capability information to a base station, the data transmission capability information being used to characterize a data transmission capability that current antennas of the terminal can support; receiving by the terminal codebook indication information transmitted by the base station, the codebook indication information including codebook information used for indicating the terminal to perform uplink transmission, and/or information used for characterizing that the base station successfully decodes or fails to decode the data transmission capability information; and determining by the terminal the codebook corresponding to the uplink transmission, according to the codebook indication information.
    Type: Grant
    Filed: July 10, 2018
    Date of Patent: February 23, 2021
    Inventors: Qiuping Huang, Qiubin Gao, Tamrakar Rakesh, Xin Su, Runhua Chen, Hui Li, Mengjun Wang
  • Patent number: 10924314
    Abstract: A method of transmitting a broadcast signal includes encoding data which is carried by Data Pipes (DPS); mapping the encoded data to constellations; interleaving the mapped data by skipping virtual cells based on a memory address for the interleaving; building at least one signal frame having symbols including the interleaved data; frequency interleaving cells of the symbols in the at least one signal frame; modulating the at least one signal frame including the frequency interleaved cells of the symbols by an orthogonal frequency division multiplexing (OFDM) scheme; and transmitting the broadcast signal including the modulated at least one signal frame.
    Type: Grant
    Filed: December 27, 2016
    Date of Patent: February 16, 2021
    Inventors: Jongseob Baek, Byounggill Kim, Woochan Kim, Jaehyung Kim, Woosuk Ko, Sungryong Hong, Chulkyu Mun, Jinyong Choi, Jaeho Hwang, Kookyeon Kwak, Byeongkook Jeong
  • Patent number: 10924318
    Abstract: Disclosed is a blind authentication method for a frequency selective fading channel based on belief propagation. The method includes: transmitting carrier signals to a frequency selective fading channel with multiple paths, where each carrier signal includes an authentication signal, a pilot signal and an information signal performing BKIC processing on a carrier signal in each path to obtain a target signal, and performing differential signal processing on the target signal to obtain a target authentication signal, obtaining a reference signal based on a key and the pilot signal in each path performing the differential signal processing on the reference signal to obtain a reference authentication signal, and calculating a correlation between the target authentication signal and the reference authentication signal to obtain a test statistic; and comparing the test statistic with a prescribed threshold to determine whether the carrier signal path can pass authentication.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: February 16, 2021
    Assignee: Shenzhen University
    Inventors: Ning Xie, Li Zhang
  • Patent number: 10917279
    Abstract: A PLC network system and method operative with OFDM for generating MIMO frames with suitable preamble portions configured to provide backward compatibility with legacy PLC devices and facilitate different receiver tasks such as frame detection and symbol timing, channel estimation and automatic gain control (AGC), including robust preamble detection in the presence of impulsive noise and frequency-selective channels of the PLC network. A PLC device may include a delayed correlation detector and a cross-correlation detector operating in concert to facilitate preamble detection in one implementation.
    Type: Grant
    Filed: July 11, 2016
    Date of Patent: February 9, 2021
    Inventors: Mostafa Sayed Ibrahim, Il Han Kim, Tarkesh Pande, Anuj Batra
  • Patent number: 10917192
    Abstract: A communication system receives a jammed signal including a sequence of complex numbers encoding one or combination of symbols transmitted by multiple transmitters. The system transforms the sequence of complex numbers into an image of real numbers having at least two columns and multiple rows, with real values of real and imaginary parts of each complex number forming different columns but the same row of the first image, processes the image with a neural network trained to suppress the wideband signal in the received signal, and detects the symbols transmitted by the transmitters from the de-jammed signal.
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: February 9, 2021
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Milutin Pajovic, Koike Akino Toshiaki, Philip Orlik
  • Patent number: 10892916
    Abstract: A channel estimation method and circuit. The channel estimation method, adapted for a receiving device of a multi-input multi-output wireless LAN system, comprises the following steps. Firstly, performing a first channel estimation operation on a long training field to obtain a plurality of first composite channel estimation values related to the long training field. Then, performing a second channel estimation operation on a signal field to obtain a plurality of second composite channel estimation values related to the signal field, and performing a third channel estimation operation on a data segment to obtain a plurality of first channel estimation values related to the data segment. Next, obtaining a plurality of second channel estimation values according to the first composite channel estimation values and the second composite channel estimation values, and adjusting the first channel estimation values related to the data segment according to the second channel estimation values.
    Type: Grant
    Filed: August 13, 2019
    Date of Patent: January 12, 2021
    Assignee: ALi Corporation
    Inventor: Yong Yang
  • Patent number: 10892835
    Abstract: A system includes a pseudorandom binary sequence (PRBS) generator configured to generate a first PRBS and a second PRBS and an exclusive-OR logic configured to exclusive-OR the first PRBS and the second PRBS to compute a third PRBS. The system also includes an adder, a correlator and a corrector. The adder adds the third PRBS to input data to compute summed data for transmission of the summed data across the channel. The correlator computes the exclusive-OR of the first PRBS and the second PRBS to reproduce the third PRBS and correlates output data from the channel to the reproduced third PRBS to compute a channel gain error and a channel memory error. The corrector extracts the input data from the output data from the channel using the computed channel gain and memory errors.
    Type: Grant
    Filed: August 8, 2018
    Date of Patent: January 12, 2021
    Inventors: Shagun Dusad, Nagarajan Viswanathan
  • Patent number: 10879954
    Abstract: Methods, systems, and devices for wireless communications are described. A transmitting device may identify synchronization signals and a set of frequency hopping channels for communications as part of a discovery reference signal (DRS) in an anchor channel. The set of frequency hopping channels may include a sequence to indicate an order for utilizing each hopping channel of the set of hopping channels. In some cases, the hopping sequence may be a pseudo random sequence. Additionally, the hopping sequence may be defined such that a non-repeating hopping sequence or pattern which visits all hopping frequencies before revisiting the same frequency is utilized. As such, each hopping channel may be utilized an equal number of times within a period of time and have an approximately equal occupancy time to the other hopping channels.
    Type: Grant
    Filed: October 29, 2018
    Date of Patent: December 29, 2020
    Assignee: QUALCOMM Incorporated
    Inventors: Chih-Hao Liu, Srinivas Yerramalli, Tamer Kadous
  • Patent number: 10873373
    Abstract: Methods and systems that can enable antenna selection (AS) and data bits in transmitted spatially modulated (SM) streams to be detected at a receiver using different detection methods. In example embodiments, encoding for an AS stream is done separately at a transmitter than encoding for data streams, enabling a receiver to use one type of detection for AS bits and a reduced complexity type of MIMO detection for the data bits.
    Type: Grant
    Filed: September 12, 2018
    Date of Patent: December 22, 2020
    Inventors: Jung Hoon Suh, Osama Aboul-Magd, Kwok Shum Au
  • Patent number: 10873491
    Abstract: An apparatus including a plurality of multipliers each configured to multiply correlations by a weight, wherein the correlations include a plurality of subsets of correlations, wherein the weight of each of the plurality of multipliers is uniquely different from the weights of at least two of the plurality of multipliers and the correlations; a summation processor configured to sum the weight multiplied correlations of the plurality of multipliers for time n, where n is an integer; and a coarse timing and coarse frequency processor configured to generate a coarse timing and a coarse frequency based on the sum.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: December 22, 2020
    Inventors: Xiaoqiang Ma, Hongbing Cheng, Linbo Li, Jungwon Lee