Patents by Inventor Shouxing Qu

Shouxing Qu 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: 20190140875
    Abstract: In some examples, a binary bit stream of input bits is encoded into a three-amplitude bipolar symbol stream of symbols, the encoding using a coding rule that specifies setting a value of a respective symbol of the symbol stream based on a respective input bit of the binary bit stream and a prior input bit of the binary bit stream that is prior to the respective input bit, the coding rule further specifying that adjacent non-zero pulses keep the same polarity. A radio frequency (RF) carrier signal is modulated using the symbol stream to produce a modulated RF signal.
    Type: Application
    Filed: January 8, 2019
    Publication date: May 9, 2019
    Inventor: Shouxing Qu
  • Patent number: 10212014
    Abstract: In some examples, an apparatus includes a transmitter configured to apply input data as a frequency-domain data sequence to modulate a set of subcarriers, and separate the frequency-domain data sequence into a first subsequence of elements and a second subsequence of elements. A first conjugate symmetric subsequence that is based on inserting a zero value into the first subsequence is formed, and a second conjugate symmetric subsequence that is based on inserting a zero value into the second subsequence is formed, where the zero values are inserted at different positions in the first and second subsequences. A time-domain sequence comprising a first component that is a function of the first conjugate symmetric subsequence, and a second component that is a function of the second conjugate symmetric subsequence is generated.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: February 19, 2019
    Assignee: BlackBerry Limited
    Inventors: Shouxing Qu, Dake He, Stephen McCann
  • Patent number: 10212009
    Abstract: In some examples, a binary bit stream of input bits is encoded into a three-amplitude bipolar symbol stream of symbols, the encoding using a coding rule that specifies setting a value of a respective symbol of the symbol stream based on a respective input bit of the binary bit stream and a prior input bit of the binary bit stream that is prior to the respective input bit, the coding rule further specifying that adjacent non-zero pulses keep the same polarity. A radio frequency (RF) carrier signal is modulated using the symbol stream to produce a modulated RF signal.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: February 19, 2019
    Assignee: BlackBerry Limited
    Inventor: Shouxing Qu
  • Publication number: 20180254933
    Abstract: In some examples, a binary bit stream of input bits is encoded into a three-amplitude bipolar symbol stream of symbols, the encoding using a coding rule that specifies setting a value of a respective symbol of the symbol stream based on a respective input bit of the binary bit stream and a prior input bit of the binary bit stream that is prior to the respective input bit, the coding rule further specifying that adjacent non-zero pulses keep the same polarity. A radio frequency (RF) carrier signal is modulated using the symbol stream to produce a modulated RF signal.
    Type: Application
    Filed: March 6, 2017
    Publication date: September 6, 2018
    Inventor: Shouxing Qu
  • Patent number: 9998315
    Abstract: A method and apparatus for orthogonal frequency division multiplexing (OFDM) modulation includes separating a frequency-domain sequence of complex numbers into a first portion and a second portion that is disjoint with the first portion, each of the first portion and the second portion including a respective half of the complex numbers of the frequency-domain sequence, and generating a time-domain sequence having a real in-phase component that is a function of the first portion only, and an imaginary quadrature-phase component that is a function of the second portion only.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: June 12, 2018
    Assignee: BlackBerry Limited
    Inventor: Shouxing Qu
  • Publication number: 20180123856
    Abstract: In some examples, an apparatus includes a transmitter configured to apply input data as a frequency-domain data sequence to modulate a set of subcarriers, and separate the frequency-domain data sequence into a first subsequence of elements and a second subsequence of elements. A first conjugate symmetric subsequence that is based on inserting a zero value into the first subsequence is formed, and a second conjugate symmetric subsequence that is based on inserting a zero value into the second subsequence is formed, where the zero values are inserted at different positions in the first and second subsequences. A time-domain sequence comprising a first component that is a function of the first conjugate symmetric subsequence, and a second component that is a function of the second conjugate symmetric subsequence is generated.
    Type: Application
    Filed: November 3, 2016
    Publication date: May 3, 2018
    Inventors: Shouxing Qu, Dake He, Stephen McCann
  • Publication number: 20170264477
    Abstract: A method and apparatus for orthogonal frequency division multiplexing (OFDM) modulation includes separating a frequency-domain sequence of complex numbers into a first portion and a second portion that is disjoint with the first portion, each of the first portion and the second portion including a respective half of the complex numbers of the frequency-domain sequence, and generating a time-domain sequence having a real in-phase component that is a function of the first portion only, and an imaginary quadrature-phase component that is a function of the second portion only.
    Type: Application
    Filed: March 8, 2016
    Publication date: September 14, 2017
    Inventor: Shouxing QU
  • Patent number: 9414336
    Abstract: A method in a network access equipment is provided. The method includes defining a burst duration for sending a plurality of reference signals. The method further includes determining an interval between ones of the plurality of reference signals in the burst duration. The method further includes defining a burst period for sending a plurality of reference signal bursts. The method further includes sending a reference signal instruction message containing an activation message and at least one of the burst duration, the interval, and the burst period.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: August 9, 2016
    Assignee: BlackBerry Limited
    Inventors: Yongkang Jia, James Earl Womack, Zhijun Cai, Shouxing Qu
  • Patent number: 9264124
    Abstract: Embodiments are directed to providing communication between a first device and a second device by: iterating, by the first device, over a number of transmitter antenna polarization types in the first device, constructing, by the first device, a number of data units based on each of the transmitter antenna polarization types, transmitting, by the first device, each of the data units for each of a number of receiver antenna polarization types in the second device, receiving, by the first device, an indication of a transmitter antenna polarization type in the first device included in the number of transmitter antenna polarization types in the first device, and transmitting, by the first device, data using the indicated transmitter antenna polarization type.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: February 16, 2016
    Assignee: BlackBerry Limited
    Inventors: Huan Wu, Yan Xin, Shouxing Qu, Arnold Sheynman
  • Patent number: 9226250
    Abstract: The present disclosure relates generally to systems and methods for timing synchronization. Uplink synchronization is a necessary component of a UE operating in a mobile, wireless network. Reliable uplink synchronization generally requires regular uplink transmission containing reference signals. A method is provided that defines a burst period for sending the reference signals, determines an interval between the reference signals, and sends a timing instruction message that includes the burst period and the determined interval. A second method is provided that receives the timing instruction message and sends the reference signals in accordance with the timing instruction.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: December 29, 2015
    Assignee: Blackberry Limited
    Inventors: Yongkang Jia, James Earl Womack, Zhijun Cai, Shouxing Qu
  • Patent number: 9160382
    Abstract: A method and apparatus for tracking and mitigating phase noise in a communication receiver are disclosed. The phase noise tracking and mitigation apparatus operates in a recursive manner and includes a quantizer for determining data symbols from noise-compensated input values, a phase noise estimator for determining raw phase noise values from the data symbols and a first sequence of uncompensated input values, an error concealment module for removing unreliable samples from the raw phase noise values, a filter operable to filter the raw phase noise values to produce filtered phase noise values, and a phase-noise compensator for determining noise-compensated output values dependent upon the filtered phase noise values and the first sequence of uncompensated input values. Filter coefficients, and initial noise-compensated input values are determined from one or more second sequences of uncompensated input values corresponding to known symbols corrupted by phase noise.
    Type: Grant
    Filed: October 8, 2013
    Date of Patent: October 13, 2015
    Assignee: BlackBerry Limited
    Inventors: Huan Wu, Daniel Noel Badiere, Shouxing Qu, Yan Xin, Arnold Sheynman
  • Patent number: 9077423
    Abstract: A user equipment and a wireless radio frequency assistant in a communication system that supports multiple input multiple output. The wireless radio frequency assistant and the user equipment operate together as a single system. The user equipment controls and activates the wireless radio frequency assistant to transform a first frequency of a radio frequency signal transmitted to the system of user equipment and the wireless radio frequency assistant to a second frequency. The wireless radio frequency assistant transmits the second frequency to the user equipment.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: July 7, 2015
    Assignee: BlackBerry Limited
    Inventors: Yan Xin, Shouxing Qu, Arnold Sheynman, Christopher Andrew DeVries, Daniel Noel Badiere
  • Patent number: 9065695
    Abstract: The present disclosure provides for a method and apparatus for efficient cross-correlation between a reference sequence and a received sequence in a wireless communication system. The reference sequence includes a concatenation of sign-adjusted sub-sequences, the sign adjustments determined by a first sign sequence of a set of sign sequences. For example, the reference sequence may be an alternating concatenation of sign-adjusted Golay complementary pair sub-sequences. The received sequence is shifted to provide a plurality of time shifted sequences that are then cross-correlated with the sub-sequences to form a set of partial cross-correlations. The partial cross-correlations are sign-adjusted using the first sign sequence and combined to produce the cross-correlation between the reference sequence and the received sequence. The cross-correlations so produced may be used for channel signature (e.g. PHY-type) identification and/or channel impulse response estimation.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: June 23, 2015
    Assignee: BlackBerry Limited
    Inventors: Huan Wu, Yan Xin, Shouxing Qu, Arnold Sheynman
  • Publication number: 20150098535
    Abstract: A method and apparatus for tracking and mitigating phase noise in a communication receiver are disclosed. The phase noise tracking and mitigation apparatus operates in a recursive manner and includes a quantizer for determining data symbols from noise-compensated input values, a phase noise estimator for determining raw phase noise values from the data symbols and a first sequence of uncompensated input values, an error concealment module for removing unreliable samples from the raw phase noise values, a filter operable to filter the raw phase noise values to produce filtered phase noise values, and a phase-noise compensator for determining noise-compensated output values dependent upon the filtered phase noise values and the first sequence of uncompensated input values. Filter coefficients, and initial noise-compensated input values are determined from one or more second sequences of uncompensated input values corresponding to known symbols corrupted by phase noise.
    Type: Application
    Filed: October 8, 2013
    Publication date: April 9, 2015
    Applicant: BlackBerry Limited
    Inventors: Huan WU, Daniel Noel BADIERE, Shouxing QU, Yan XIN, Arnold SHEYNMAN
  • Publication number: 20150063495
    Abstract: In some implementations, a method of a receiver includes receiving an M-ary differential phase-shift keying (DPSK) signal containing a phase offset and optionally a phase rotation. The phase offset of the received signal may be estimated. A soft detection metric employing the estimated phase offset may be calculated to provide enhanced receiver performance. The method may include subtracting the phase offset estimate from the received signal prior to calculating the soft detection metric and/or de-rotating the phase of the received signal by the same amount of the phase rotation prior to estimating the phase offset of the received signal. Estimating the phase offset may be based on maximum likelihood principle. The soft detection metric may be a log-likelihood ratio (LLR) for soft detection of the received M-ary DPSK signal and the calculation of the LLR may be based upon a conditional joint probability density function of two consecutively received symbols.
    Type: Application
    Filed: August 27, 2013
    Publication date: March 5, 2015
    Inventors: Shouxing Qu, Huan Wu, Yan Xin, Arnold Sheynman
  • Patent number: 8958462
    Abstract: The present disclosure provides for the construction and use of a set of Zero-Correlation-Zone (ZCZ) Concatenated Complementary Pair (CCP) sequences with zero-correlation-zone range greater than one or with zero-correlation-zone range equal to one and the sequence set size greater than two. Complementary pair sequences A and B are selected and, for each member of the set of ZCZ CCP sequences, sign sequences pA and pB are combined with the complementary pair sequences to form a member ZCZ CCP sequence of the set. A ZCZ CCP sequence modified by propagation over a communication channel may be identified by cross-correlation with ZCZ CCP sequences of the set. A set of sign sequences may be constructed by recursive expansion from an initial set or found by a computer search. The sequences may be used in a transceiver of a portable electronic device or other communication device.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: February 17, 2015
    Assignee: BlackBerry Limited
    Inventors: Yan Xin, Yongkang Jia, Huan Wu, Shouxing Qu, Arnold Sheynman
  • Publication number: 20140376670
    Abstract: The present disclosure provides for a method and apparatus for efficient cross-correlation between a reference sequence and a received sequence in a wireless communication system. The reference sequence includes a concatenation of sign-adjusted sub-sequences, the sign adjustments determined by a first sign sequence of a set of sign sequences. For example, the reference sequence may be an alternating concatenation of sign-adjusted Golay complementary pair sub-sequences. The received sequence is shifted to provide a plurality of time shifted sequences that are then cross-correlated with the sub-sequences to form a set of partial cross-correlations. The partial cross-correlations are sign-adjusted using the first sign sequence and combined to produce the cross-correlation between the reference sequence and the received sequence. The cross-correlations so produced may be used for channel signature (e.g. PHY-type) identification and/or channel impulse response estimation.
    Type: Application
    Filed: September 10, 2014
    Publication date: December 25, 2014
    Applicant: BLACKBERRY LIMITED
    Inventors: Huan WU, Yan XIN, Shouxing QU, Arnold SHEYNMAN
  • Patent number: 8908799
    Abstract: Systems and methods of performing ASK or QAM modulation with uneven distance between symbols are provided. Different bit positions mapped to such symbols are assigned to different receivers, with the result that there are different BER performances among bits sent from a transmitter to the different receivers. Bits for multiple receivers are mapped to a UASK constellation or a UQAM constellation without using superposition.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: December 9, 2014
    Assignee: Blackberry Limited
    Inventors: Shouxing Qu, Yan Xin, Johanna Lisa Dwyer
  • Publication number: 20140348261
    Abstract: Systems and methods of performing ASK or QAM modulation with uneven distance between symbols are provided. These are used to provide differing BER performances among bits sent from a transmitter to a receiver.
    Type: Application
    Filed: August 6, 2014
    Publication date: November 27, 2014
    Inventors: Shouxing Qu, Yan Xin, Johanna Lisa Dwyer, Paul Carpenter
  • Publication number: 20140321566
    Abstract: Embodiments are directed to providing communication between a first device and a second device by: iterating, by the first device, over a number of transmitter antenna polarization types in the first device, constructing, by the first device, a number of data units based on each of the transmitter antenna polarization types, transmitting, by the first device, each of the data units for each of a number of receiver antenna polarization types in the second device, receiving, by the first device, an indication of a transmitter antenna polarization type in the first device included in the number of transmitter antenna polarization types in the first device, and transmitting, by the first device, data using the indicated transmitter antenna polarization type.
    Type: Application
    Filed: April 26, 2013
    Publication date: October 30, 2014
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Huan Wu, Yan Xin, Shouxing Qu, Arnold Sheynman