Patents by Inventor Wanlun Zhao

Wanlun Zhao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20230042362
    Abstract: This disclosure relates to techniques for reducing blind decoding of downlink control channels in a wireless communication system. The techniques may include determining whether a control channel pilot signal, such as a demodulation reference signal (DMRS) is present within a set of control carrier entities, and accordingly determining whether the downlink control channel is present within the set of control channel elements. In this manner, a number of candidates for blind decoding may be reduced.
    Type: Application
    Filed: August 2, 2022
    Publication date: February 9, 2023
    Inventors: Wanlun Zhao, Parvathanathan Subrahmanya
  • Publication number: 20220345335
    Abstract: Aspects of this disclosure relate to a time-division duplex (TDD) multiple-input multiple-output (MIMO) system that includes a plurality of nodes. The plurality of nodes collectively includes antennas divided into groups. Reference signals can be transmitted from each group of antennas to one or more other groups of antennas during respective time slots. Channel estimates can be generated based on the received reference signals. The channel estimates can be jointly processed to generate calibration coefficients. Each calibration coefficient can represent a ratio associated with a transmit coefficient and a receive coefficient. Example algorithms for the joint processing are disclosed.
    Type: Application
    Filed: July 7, 2022
    Publication date: October 27, 2022
    Inventors: Jinghu Chen, Wanlun Zhao, Tamer Adel Kadous, Peter John Black, Michael Mingxi Fan
  • Publication number: 20220345336
    Abstract: Aspects of this disclosure relate to reference signal channel estimation. A wireless communication channel between two nodes can be estimated based on a received reference signal, such as a Sounding Reference Signal. Techniques are disclosed to improve performance of reference signal channel estimation and make channel estimates more robust in the presence of one or more of a variety of impairments. Frequency domain processing and/or time domain processing can be performed to reduce distortion in channel estimates.
    Type: Application
    Filed: June 23, 2022
    Publication date: October 27, 2022
    Inventors: Peter John Black, Jinghu Chen, Jing Jiang, Tamer Adel Kadous, Wanlun Zhao
  • Patent number: 11411778
    Abstract: Aspects of this disclosure relate to a time-division duplex (TDD) multiple-input multiple-output (MIMO) system that includes a plurality of nodes. The plurality of nodes collectively includes antennas divided into groups. Reference signals can be transmitted from each group of antennas to one or more other groups of antennas during respective time slots. Channel estimates can be generated based on the received reference signals. The channel estimates can be jointly processed to generate calibration coefficients. Each calibration coefficient can represent a ratio associated with a transmit coefficient and a receive coefficient. Example algorithms for the joint processing are disclosed.
    Type: Grant
    Filed: July 12, 2019
    Date of Patent: August 9, 2022
    Assignee: XCOM Labs, Inc.
    Inventors: Jinghu Chen, Wanlun Zhao, Tamer Adel Kadous, Peter John Black, Michael Mingxi Fan
  • Patent number: 11411779
    Abstract: Aspects of this disclosure relate to reference signal channel estimation. A wireless communication channel between two nodes can be estimated based on a received reference signal, such as a Sounding Reference Signal. Techniques are disclosed to improve performance of reference signal channel estimation and make channel estimates more robust in the presence of one or more of a variety of impairments. Frequency domain processing and/or time domain processing can be performed to reduce distortion in channel estimates.
    Type: Grant
    Filed: March 31, 2020
    Date of Patent: August 9, 2022
    Assignee: XCOM Labs, Inc.
    Inventors: Peter John Black, Jinghu Chen, Jing Jiang, Tamer Adel Kadous, Wanlun Zhao
  • Patent number: 11290163
    Abstract: Aspects of the disclosure relate to a selection scheme implemented by a scheduler in a multiple-input multiple-output (MIMO) network to identify which users to schedule simultaneously during the same time slot. For downlink communications and a particular frequency wholeband or sub-band, the scheduler can determine downlink channel information using uplink channel information for channels between base stations and UEs. The scheduler can then determine a strength of the channels using the downlink channel information, order the UEs using a fairness metric based on the channel strengths, and compute one or more QR decompositions to identify whether a spatial dimension of a UE is roughly or approximately orthogonal to spatial dimension(s) of other UEs selected to be served during a time slot being scheduled. If the spatial dimensions are roughly or approximately orthogonal, the scheduler selects the UE to be served at the same time as other UEs already selected.
    Type: Grant
    Filed: March 11, 2021
    Date of Patent: March 29, 2022
    Assignee: XCOM Labs, Inc.
    Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
  • Publication number: 20210328838
    Abstract: Aspects of this disclosure relate to reference signal channel estimation. A wireless communication channel between two nodes can be estimated based on a received reference signal, such as a Sounding Reference Signal. Techniques are disclosed to improve performance of reference signal channel estimation and make channel estimates more robust in the presence of one or more of a variety of impairments. Frequency domain processing and/or time domain processing can be performed to reduce distortion in channel estimates.
    Type: Application
    Filed: March 31, 2020
    Publication date: October 21, 2021
    Inventors: Peter John Black, Jinghu Chen, Jing Jiang, Tamer Adel Kadous, Wanlun Zhao
  • Publication number: 20210314031
    Abstract: Aspects of the disclosure relate to a selection scheme implemented by a scheduler in a multiple-input multiple-output (MIMO) network to identify which users to schedule simultaneously during the same time slot. For downlink communications and a particular frequency wholeband or sub-band, the scheduler can determine downlink channel information using uplink channel information for channels between base stations and UEs. The scheduler can then determine a strength of the channels using the downlink channel information, order the UEs using a fairness metric based on the channel strengths, and compute one or more QR decompositions to identify whether a spatial dimension of a UE is roughly or approximately orthogonal to spatial dimension(s) of other UEs selected to be served during a time slot being scheduled. If the spatial dimensions are roughly or approximately orthogonal, the scheduler selects the UE to be served at the same time as other UEs already selected.
    Type: Application
    Filed: March 11, 2021
    Publication date: October 7, 2021
    Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
  • Patent number: 10985813
    Abstract: Aspects of the disclosure relate to a selection scheme implemented by a scheduler in a multiple-input multiple-output (MIMO) network to identify which users to schedule simultaneously during the same time slot. For downlink communications and a particular frequency wholeband or sub-band, the scheduler can determine downlink channel information using uplink channel information for channels between base stations and UEs. The scheduler can then determine a strength of the channels using the downlink channel information, order the UEs using a fairness metric based on the channel strengths, and compute one or more QR decompositions to identify whether a spatial dimension of a UE is roughly or approximately orthogonal to spatial dimension(s) of other UEs selected to be served during a time slot being scheduled. If the spatial dimensions are roughly or approximately orthogonal, the scheduler selects the UE to be served at the same time as other UEs already selected.
    Type: Grant
    Filed: June 12, 2020
    Date of Patent: April 20, 2021
    Assignee: XCOM Labs, Inc.
    Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
  • Publication number: 20210014085
    Abstract: Aspects of this disclosure relate to a time-division duplex (TDD) multiple-input multiple-output (MIMO) system that includes a plurality of nodes. The plurality of nodes collectively includes antennas divided into groups. Reference signals can be transmitted from each group of antennas to one or more other groups of antennas during respective time slots. Channel estimates can be generated based on the received reference signals. The channel estimates can be jointly processed to generate calibration coefficients. Each calibration coefficient can represent a ratio associated with a transmit coefficient and a receive coefficient. Example algorithms for the joint processing are disclosed.
    Type: Application
    Filed: July 12, 2019
    Publication date: January 14, 2021
    Inventors: Jinghu Chen, Wanlun Zhao, Tamer Adel Kadous, Peter John Black, Michael Mingxi Fan
  • Publication number: 20200382169
    Abstract: Aspects of the disclosure relate to a selection scheme implemented by a scheduler in a multiple-input multiple-output (MIMO) network to identify which users to schedule simultaneously during the same time slot. For downlink communications and a particular frequency wholeband or sub-band, the scheduler can determine downlink channel information using uplink channel information for channels between base stations and UEs. The scheduler can then determine a strength of the channels using the downlink channel information, order the UEs using a fairness metric based on the channel strengths, and compute one or more QR decompositions to identify whether a spatial dimension of a UE is roughly or approximately orthogonal to spatial dimension(s) of other UEs selected to be served during a time slot being scheduled. If the spatial dimensions are roughly or approximately orthogonal, the scheduler selects the UE to be served at the same time as other UEs already selected.
    Type: Application
    Filed: June 12, 2020
    Publication date: December 3, 2020
    Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
  • Patent number: 10735057
    Abstract: Aspects of the disclosure relate to a selection scheme implemented by a scheduler in a multiple-input multiple-output (MIMO) network to identify which users to schedule simultaneously during the same time slot. For uplink communications and a particular frequency wholeband or sub-band, the scheduler can obtain uplink channel information for channels between base stations and UEs. The scheduler can then determine a strength of the channels using the uplink channel information, order the UEs using a fairness metric based on the channel strengths, and compute one or more QR decompositions to identify whether a spatial dimension of a UE is roughly or approximately orthogonal to spatial dimension(s) of other UEs selected to be served during a time slot being scheduled. If the spatial dimensions are roughly or approximately orthogonal, the scheduler selects the UE to be served at the same time as other UEs already selected.
    Type: Grant
    Filed: April 29, 2019
    Date of Patent: August 4, 2020
    Assignee: XCOM Labs, Inc.
    Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
  • Patent number: 10686502
    Abstract: Aspects of the disclosure relate to a selection scheme implemented by a scheduler in a multiple-input multiple-output (MIMO) network to identify which users to schedule simultaneously during the same time slot. For downlink communications and a particular frequency wholeband or sub-band, the scheduler can determine downlink channel information using uplink channel information for channels between base stations and UEs. The scheduler can then determine a strength of the channels using the downlink channel information, order the UEs using a fairness metric based on the channel strengths, and compute one or more QR decompositions to identify whether a spatial dimension of a UE is roughly or approximately orthogonal to spatial dimension(s) of other UEs selected to be served during a time slot being scheduled. If the spatial dimensions are roughly or approximately orthogonal, the scheduler selects the UE to be served at the same time as other UEs already selected.
    Type: Grant
    Filed: April 29, 2019
    Date of Patent: June 16, 2020
    Assignee: XCOM Labs, Inc.
    Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
  • Publication number: 20160014619
    Abstract: Methods and apparatus for managing interference are described and may include updating a covariance inverse value of a linear function to remove an effect on the linear function of a first set of channels associated with a first network entity, wherein the first set of channels are cancelled in response to performing a first cancellation procedure. Methods and apparatus for managing interference may further include performing a second cancellation procedure to cancel a second set of channels associated with a second network entity based at least in part on the updated covariance inverse value of the linear function.
    Type: Application
    Filed: October 24, 2014
    Publication date: January 14, 2016
    Inventors: Ming KANG, Wanlun Zhao, Insung Kang, Farrokh Abrishamkar
  • Patent number: 9198053
    Abstract: Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: November 24, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Stephen William Edge, Peter John Black, Qiang Wu, Wanlun Zhao, Yeliz Tokgoz, Roberto Padovani, Ayman Fawzy Naguib, Je Woo Kim, Pranav Dayal, Parag Arun Agashe
  • Publication number: 20150280803
    Abstract: In an aspect of the disclosure, a method, a computer program product, and an apparatus are provided. The apparatus switches from a multiple receive diversity (RxD) on state to a RxD off state upon detecting a condition is in a certain state. The condition may be a high measure of correlation between a first antenna and a second antenna, or a high level of imbalance between the first antenna and the second antenna. The apparatus also periodically switches back to the RxD on state to determine if the condition remains in the certain state. The time period between entries into the RxD on state is dynamically adjusted as a function of prior conditions.
    Type: Application
    Filed: June 18, 2013
    Publication date: October 1, 2015
    Inventors: Jinghu Chen, Wanlun Zhao, Qiang Shen, Insung Kang, Jilei Hou
  • Patent number: 9119026
    Abstract: Briefly, in accordance with one embodiment, a method of transmitting signals is provided. Signal waveforms are transmitted from at least two respective sectors. The at least two respective sectors are from at least two different sets of a superset of sectors. The transmitted signal waveforms include signal waveforms at least nearly mutually orthogonal at least along a particular signal dimension. An advantage of such an embodiment, for example, is reduced signal interference.
    Type: Grant
    Filed: May 1, 2008
    Date of Patent: August 25, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Peter John Black, Qiang Wu, Roberto Padovani, Wanlun Zhao, Yeliz Tokgoz, Ayman Fawzy Naguib, Pranav Dayal, Parag Arun Agashe, Naga Bhushan, Je Woo Kim
  • Patent number: 9007942
    Abstract: A method of wireless communication includes receiving a wireless signal at a linear receiver, and iteratively computing an inverted covariance matrix in frequency domain, one channel code at a time. The method also includes computing receiver demodulation coefficients based on the inverted covariance matrix and the frequency domain channel estimate or time domain channel estimate. The method further includes deriving a transmitter symbol based on a received signal vector and the coefficients.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: April 14, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Wanlun Zhao, Fuyun Ling, Mingxi Fan, Jinghu Chen
  • Patent number: 8839079
    Abstract: The present disclosure describes methods and apparatuses for improved transport block decoding in devices capable of wireless communication, which may include user equipment and network entities. For example, the present disclosure presents methods and apparatuses for decoding a code block from a plurality of code blocks corresponding to a transport block, obtaining a reliability indicator that identifies a reliability of the decoding of the code block, comparing the reliability indicator to a reliability threshold, and determining whether to decode a subsequent code block from the plurality of code blocks based on the comparing. Furthermore, these methods and apparatuses may include determining not to decode at least one subsequent code block of the transport block where the comparing indicates that the reliability indicator is less than the reliability threshold. As such, device power is not unnecessarily consumed by decoding likely superfluous code blocks.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: September 16, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Jinghu Chen, Wanlun Zhao, Michael Mingxi Fan, Fuyun Ling, Peter John Black, Krishna Kiran Mukkavilli, Weihong Jing, Jia Tang
  • Patent number: 8782112
    Abstract: An improved receiver apparatus and algorithm for equalizing signals in a receiver device may equalize a block of data generated from N data symbols in a single carrier communication system. A first algorithm may be applied to a plurality of signal samples to generate a frequency domain representation of the samples. A channel estimate may be generated and a frequency response of a zero-forcing or a minimum-mean-square equalizer is applied. A conjugate of the computed frequency response is multiplied with a frequency domain representation for each sample to generate a product value. N-aliased frequency domain values from the generated product value may be determined for each of the samples. A second algorithm is applied to the generated N-aliased frequency domain values to generate estimates of the transmitted time domain data symbols.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: July 15, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Fuyun Ling, Wanlun Zhao