Patents by Inventor Qingyuan Dai

Qingyuan Dai 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: 20200177312
    Abstract: A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
    Type: Application
    Filed: February 10, 2020
    Publication date: June 4, 2020
    Applicant: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventors: Robert Lind Olesen, Eldad M. Zeira, Peter J. Voltz, Yongwen E. Yang, Qingyuan Dai, Chang-Soo Koo, I-Tai Lu, KunJu Tsai
  • Patent number: 10560223
    Abstract: A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
    Type: Grant
    Filed: May 7, 2018
    Date of Patent: February 11, 2020
    Assignee: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventors: Robert L. Olesen, Eldad M. Zeira, Peter J. Voltz, Yongwen E. Yang, Qingyuan Dai, Chang-Soo Koo, I-Tai Lu, KunJu Tsai
  • Publication number: 20180254856
    Abstract: A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
    Type: Application
    Filed: May 7, 2018
    Publication date: September 6, 2018
    Applicant: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventors: Robert L. Olesen, Eldad M. Zeira, Peter J. Voltz, Yongwen E. Yang, Qingyuan Dai, Chang-Soo Koo, I-Tai Lu, KunJu Tsai
  • Patent number: 9991992
    Abstract: A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: June 5, 2018
    Assignee: InterDigital Technology Corporation
    Inventors: Robert L. Olesen, Eldad M. Zeira, Peter J. Voltz, Yongwen E. Yang, Qingyuan Dai, Chang-Soo Koo, I-Tai Lu, KunJu Tsai
  • Publication number: 20170163383
    Abstract: A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
    Type: Application
    Filed: February 16, 2017
    Publication date: June 8, 2017
    Applicant: InterDigital Technology Corporation
    Inventors: Robert L. Olesen, Eldad M. Zeira, Peter J. Voltz, Yongwen E. Yang, Qingyuan Dai, Chang-Soo Koo, I-Tai Lu, KunJu Tsai
  • Patent number: 9621251
    Abstract: A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
    Type: Grant
    Filed: January 19, 2015
    Date of Patent: April 11, 2017
    Assignee: InterDigital Technology Corporation
    Inventors: Robert L. Olesen, Eldad M. Zeira, Peter J. Voltz, Yongwen E. Yang, Qingyuan Dai, Chang-Soo Koo, I-Tai Lu, KunJu Tsai
  • Patent number: 9585111
    Abstract: A method including receiving at a synchronizing node a first reference frame from a first reference node at a first time and storing a first time value representing the first time, and calculating a timing estimator by subtracting a minimum time value, representing the distance from the synchronizing node to the first reference node, from the first time value. The method includes receiving at the synchronizing node a second reference frame at a second time and transmitting from the synchronizing node to the first reference node a short timing contention time frame. The method includes receiving at the synchronizing node from the first reference node an arrival time value representing the time at which the first reference node received the short timing contention frame and calculating a time drift from the first arrival time value and the second time value and adjusting the timing estimator based on the time drift.
    Type: Grant
    Filed: September 18, 2013
    Date of Patent: February 28, 2017
    Assignee: Elbit Systems of America, LLC
    Inventors: Qingyuan Dai, Charles H. Woloszynski
  • Publication number: 20150139143
    Abstract: A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
    Type: Application
    Filed: January 19, 2015
    Publication date: May 21, 2015
    Applicant: InterDigital Technology Corporation
    Inventors: Robert L. Olesen, Eldad M. Zeira, Peter J. Voltz, Yongwen E. Yang, Qingyuan Dai, Changsoo Koo, I-Tai Lu, KunJu Tsai
  • Publication number: 20140016626
    Abstract: A method including receiving at a synchronizing node a first reference frame from a first reference node at a first time and storing a first time value representing the first time, and calculating a timing estimator by subtracting a minimum time value, representing the distance from the synchronizing node to the first reference node, from the first time value. The method includes receiving at the synchronizing node a second reference frame at a second time and transmitting from the synchronizing node to the first reference node a short tuning contention time frame. The method includes receiving at the synchronizing node from the first reference node an arrival time value representing the time at which the first reference node received the short timing contention frame and calculating a time drift from the first arrival time value and the second time value and adjusting the timing estimator based on the time drift.
    Type: Application
    Filed: September 18, 2013
    Publication date: January 16, 2014
    Applicant: ELBIT SYSTEMS OF AMERICA, LLC
    Inventors: Qingyuan Dai, Charles H. Woloszynski
  • Patent number: 8553824
    Abstract: A method including receiving at a synchronizing node a first reference frame from a first reference node at a first time and storing a first time value representing the first time, and calculating a timing estimator by subtracting a minimum time value, representing the distance from the synchronizing node to the first reference node, from the first time value. The method includes receiving at the synchronizing node a second reference frame at a second time and transmitting from the synchronizing node to the first reference node a short timing contention time frame. The method includes receiving at the synchronizing node from the first reference node an arrival time value representing the time at which the first reference node received the short timing contention frame and calculating a time drift from the first arrival time value and the second time value and adjusting the timing estimator based on the time drift.
    Type: Grant
    Filed: February 19, 2009
    Date of Patent: October 8, 2013
    Assignee: Elbit Systems of America, LLC
    Inventors: Qingyuan Dai, Charles H. Woloszynski
  • Patent number: 8391399
    Abstract: A communications system includes one or more antennas and a receiver coupled to the one or more antennas. The one or more antennas are operable to receive a signal transmitted from a transmitter. The receiver includes a combiner that is operable to combine the signals received by the one or more antennas into a combined signal. The signal received by the receiver is a single-carrier waveform comprising a signal field and one or more data fields after the signal field. The signal field indicates a modulation technique of the one or more data fields. The one or more data fields include a first short unique word, a data payload after the second short unique word, and a second short unique word after the data payload.
    Type: Grant
    Filed: November 2, 2009
    Date of Patent: March 5, 2013
    Assignee: Elbit Systems of America, LLC
    Inventors: Qingyuan Dai, Charles H. Woloszynski, Gregory N. Smith
  • Patent number: 8295401
    Abstract: A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
    Type: Grant
    Filed: January 10, 2007
    Date of Patent: October 23, 2012
    Assignee: InterDigital Technology Corporation
    Inventors: Robert Lind Olesen, Eldad M. Zeira, Peter J. Voltz, Yongwen E. Yang, Qingyuan Dai, Chang-Soo Koo, I-Tai Lu, KunJu Tsai
  • Patent number: 8019036
    Abstract: In an orthogonal frequency division multiplexed (OFDM) multiple-in multiple-out (MIMO) wireless communication system, a method for correcting sampler clock frequency offset in a receiver comprises acquiring the frequency offset and symbol timing in a received signal by the receiver. The estimated value of a fractional offset is computed, and a correction in the frequency domain based upon the estimated value of the fractional offset is performed.
    Type: Grant
    Filed: March 2, 2007
    Date of Patent: September 13, 2011
    Assignee: InterDigital Technology Corporation
    Inventors: Peter J. Voltz, Robert Lind Olesen, I-Tai Lu, Chang-Soo Koo, Qingyuan Dai, Yongwen E. Yang, Hui-Yuan Teng
  • Publication number: 20100290554
    Abstract: A communications system includes one or more antennas and a receiver coupled to the one or more antennas. The one or more antennas are operable to receive a signal transmitted from a transmitter. The receiver includes a combiner that is operable to combine the signals received by the one or more antennas into a combined signal. The signal received by the receiver is a single-carrier waveform comprising a signal field and one or more data fields after the signal field. The signal field indicates a modulation technique of the one or more data fields. The one or more data fields include a first short unique word, a data payload after the second short unique word, and a second short unique word after the data payload.
    Type: Application
    Filed: November 2, 2009
    Publication date: November 18, 2010
    Applicant: Elbit Systems of America, LLC
    Inventors: Qingyuan Dai, Charles H. Woloszynski, Gregory N. Smith
  • Patent number: 7773681
    Abstract: In a wireless communication system, a method and apparatus for noise estimation of a received OFDM communication signal, wherein the signal comprises a data frame with a preamble having at least one long training field (LTF) containing two substantially similar OFDM symbols, comprise examining the LTF for substantially similar OFDM symbols. The noise power in the signal is estimated and the received signal power is measured. The signal to noise ratio is calculated and the signal power is determined by subtracting the noise power from the signal noise.
    Type: Grant
    Filed: August 1, 2006
    Date of Patent: August 10, 2010
    Assignee: InterDigital Technology Corporation
    Inventors: Chang-Soo Koo, Peter J. Voltz, I-Tai Lu, Qingyuan Dai, Robert L. Olesen
  • Publication number: 20090207954
    Abstract: A method including receiving at a synchronizing node a first reference frame from a first reference node at a first time and storing a first time value representing the first time, and calculating a timing estimator by subtracting a minimum time value, representing the distance from the synchronizing node to the first reference node, from the first time value. The method includes receiving at the synchronizing node a second reference frame at a second time and transmitting from the synchronizing node to the first reference node a short timing contention time frame. The method includes receiving at the synchronizing node from the first reference node an arrival time value representing the time at which the first reference node received the short timing contention frame and calculating a time drift from the first arrival time value and the second time value and adjusting the timing estimator based on the time drift.
    Type: Application
    Filed: February 19, 2009
    Publication date: August 20, 2009
    Applicant: Innovative Cocepts, Inc.
    Inventors: Qingyuan Dai, Charles H. Woloszynski
  • Publication number: 20070223605
    Abstract: In an orthogonal frequency division multiplexed (OFDM) multiple-in multiple-out (MIMO) wireless communication system, a method for correcting sampler clock frequency offset in a receiver comprises acquiring the frequency offset and symbol timing in a received signal by the receiver. The estimated value of a fractional offset is computed, and a correction in the frequency domain based upon the estimated value of the fractional offset is performed.
    Type: Application
    Filed: March 2, 2007
    Publication date: September 27, 2007
    Applicant: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventors: Peter Voltz, Robert Olesen, I-Tai Lu, Chang-Soo Koo, Qingyuan Dai, Yongwen Yang, Hui-Yuan Teng
  • Publication number: 20070211822
    Abstract: A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.
    Type: Application
    Filed: January 10, 2007
    Publication date: September 13, 2007
    Applicant: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventors: Robert Olesen, Eldad Zeira, Peter Voltz, Yongwen Yang, Qingyuan Dai, Chang-Soo Koo, I-Tai Lu, KunJu Tsai
  • Publication number: 20070053452
    Abstract: In a wireless communication system, a method and apparatus for noise estimation of a received OFDM communication signal, wherein the signal comprises a data frame with a preamble having at least one long training field (LTF) containing two substantially similar OFDM symbols, comprise examining the LTF for substantially similar OFDM symbols. The noise power in the signal is estimated and the received signal power is measured. The signal to noise ratio is calculated and the signal power is determined by subtracting the noise power from the signal noise.
    Type: Application
    Filed: August 1, 2006
    Publication date: March 8, 2007
    Applicant: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventors: Chang-Soo Koo, Peter Voltz, I-Tai Lu, Qingyuan Dai, Robert Olesen