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).
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Publication number: 20230042362Abstract: 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: ApplicationFiled: August 2, 2022Publication date: February 9, 2023Inventors: Wanlun Zhao, Parvathanathan Subrahmanya
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Publication number: 20220345335Abstract: 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: ApplicationFiled: July 7, 2022Publication date: October 27, 2022Inventors: Jinghu Chen, Wanlun Zhao, Tamer Adel Kadous, Peter John Black, Michael Mingxi Fan
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Publication number: 20220345336Abstract: 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: ApplicationFiled: June 23, 2022Publication date: October 27, 2022Inventors: Peter John Black, Jinghu Chen, Jing Jiang, Tamer Adel Kadous, Wanlun Zhao
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Patent number: 11411778Abstract: 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: GrantFiled: July 12, 2019Date of Patent: August 9, 2022Assignee: XCOM Labs, Inc.Inventors: Jinghu Chen, Wanlun Zhao, Tamer Adel Kadous, Peter John Black, Michael Mingxi Fan
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Patent number: 11411779Abstract: 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: GrantFiled: March 31, 2020Date of Patent: August 9, 2022Assignee: XCOM Labs, Inc.Inventors: Peter John Black, Jinghu Chen, Jing Jiang, Tamer Adel Kadous, Wanlun Zhao
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Patent number: 11290163Abstract: 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: GrantFiled: March 11, 2021Date of Patent: March 29, 2022Assignee: XCOM Labs, Inc.Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
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Publication number: 20210328838Abstract: 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: ApplicationFiled: March 31, 2020Publication date: October 21, 2021Inventors: Peter John Black, Jinghu Chen, Jing Jiang, Tamer Adel Kadous, Wanlun Zhao
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Publication number: 20210314031Abstract: 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: ApplicationFiled: March 11, 2021Publication date: October 7, 2021Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
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Patent number: 10985813Abstract: 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: GrantFiled: June 12, 2020Date of Patent: April 20, 2021Assignee: XCOM Labs, Inc.Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
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Publication number: 20210014085Abstract: 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: ApplicationFiled: July 12, 2019Publication date: January 14, 2021Inventors: Jinghu Chen, Wanlun Zhao, Tamer Adel Kadous, Peter John Black, Michael Mingxi Fan
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Publication number: 20200382169Abstract: 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: ApplicationFiled: June 12, 2020Publication date: December 3, 2020Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
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Patent number: 10735057Abstract: 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: GrantFiled: April 29, 2019Date of Patent: August 4, 2020Assignee: XCOM Labs, Inc.Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
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Patent number: 10686502Abstract: 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: GrantFiled: April 29, 2019Date of Patent: June 16, 2020Assignee: XCOM Labs, Inc.Inventors: Wanlun Zhao, Jinghu Chen, Tamer Adel Kadous, Michael Mingxi Fan, Peter John Black
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Publication number: 20160014619Abstract: 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: ApplicationFiled: October 24, 2014Publication date: January 14, 2016Inventors: Ming KANG, Wanlun Zhao, Insung Kang, Farrokh Abrishamkar
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Patent number: 9198053Abstract: 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: GrantFiled: March 28, 2013Date of Patent: November 24, 2015Assignee: QUALCOMM IncorporatedInventors: 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
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Publication number: 20150280803Abstract: 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: ApplicationFiled: June 18, 2013Publication date: October 1, 2015Inventors: Jinghu Chen, Wanlun Zhao, Qiang Shen, Insung Kang, Jilei Hou
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Patent number: 9119026Abstract: 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: GrantFiled: May 1, 2008Date of Patent: August 25, 2015Assignee: QUALCOMM IncorporatedInventors: Peter John Black, Qiang Wu, Roberto Padovani, Wanlun Zhao, Yeliz Tokgoz, Ayman Fawzy Naguib, Pranav Dayal, Parag Arun Agashe, Naga Bhushan, Je Woo Kim
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Patent number: 9007942Abstract: 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: GrantFiled: August 2, 2012Date of Patent: April 14, 2015Assignee: QUALCOMM IncorporatedInventors: Wanlun Zhao, Fuyun Ling, Mingxi Fan, Jinghu Chen
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Patent number: 8839079Abstract: 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: GrantFiled: August 20, 2012Date of Patent: September 16, 2014Assignee: QUALCOMM IncorporatedInventors: Jinghu Chen, Wanlun Zhao, Michael Mingxi Fan, Fuyun Ling, Peter John Black, Krishna Kiran Mukkavilli, Weihong Jing, Jia Tang
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Patent number: 8782112Abstract: 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: GrantFiled: June 28, 2011Date of Patent: July 15, 2014Assignee: QUALCOMM IncorporatedInventors: Fuyun Ling, Wanlun Zhao