Patents by Inventor Haixiang Liang

Haixiang Liang 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).

  • Patent number: 10778364
    Abstract: An ONU comprises a receiver configured to receive a continuous-mode TDMA downstream signal from an OLT; a PD coupled to the receiver and configured to convert the continuous-mode TDMA downstream signal to an electrical signal or an RF signal; an ADC coupled to the PD and configured to convert the electrical signal or the RF signal to a digital signal; and a burst-mode data recovery stage coupled to the ADC and configured to perform data recovery on a segment of the digital signal corresponding to the ONU, the burst-mode data recovery stage comprises a synchronization stage configured to perform synchronization on the segment.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: September 15, 2020
    Assignee: Futurewei Technologies, Inc.
    Inventors: Xiang Liu, Frank Effenberger, Huaiyu Zeng, Guozhu Long, Haixiang Liang
  • Publication number: 20200145176
    Abstract: An apparatus for transmission of data encapsulated in a bi-directional network transmission protocol over a distributed wireless network comprises a processor configured to direct the data encapsulated in the bi-directional network transmission protocol for transmission by a first wireless transmitter at a first frequency, and direct acknowledgement messages of the bi-directional network transmission protocol generated in response to reception of the data, for transmission by a second wireless transmitter at a second frequency.
    Type: Application
    Filed: December 27, 2019
    Publication date: May 7, 2020
    Inventors: Oren Hencinski, Haixiang Liang, Jie Lv
  • Patent number: 10505583
    Abstract: A digital subscriber line (DSL) network device for coupling to DSL communication lines, the network device comprising: multiplexing circuitry that transmits signals to vector-compliant consumer premises equipment (CPE) and legacy CPE via the DSL communication lines; and processing circuitry configured to: initiate transmission of a predetermined set of orthogonal pilot sequences to a plurality of vector-compliant CPEs; initiate transmission of data symbols corresponding to the set of orthogonal pilot sequences to one or more legacy CPEs; pre-process line errors of a victim vector-compliant CPE to remove far-end crosstalk due to the vector compliant disturber lines and perform the same pre-processing for the transmitted data symbols; determine far-end channel crosstalk information using a correlation of the pre-processed line errors and the pre-processed transmitted data symbols; and reduce far-end channel crosstalk of the victim vector-compliant CPE using the determined far-end channel crosstalk information.
    Type: Grant
    Filed: January 19, 2017
    Date of Patent: December 10, 2019
    Assignee: Futurewei Technologies, Inc.
    Inventors: Haixiang Liang, Yujie He, Jianping Tu
  • Patent number: 10382093
    Abstract: A method for implementing an upstream symbol alignment within a network component, the method comprising receiving an upstream sync signal via an initializing digital subscriber line (DSL) during a channel discovery phase from a customer premise equipment (CPE), determining a corrected upstream symbol alignment value based upon the upstream sync signal, and transmitting the corrected upstream symbol alignment value to the CPE, wherein the upstream symbol alignment value determines an upstream symbol alignment for one or more upstream transmissions, and wherein the corrected upstream symbol alignment value is determined before receiving a plurality of upstream data signals within the data symbol positions during the channel discovery phase.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: August 13, 2019
    Assignee: Futurewei Technologies, Inc.
    Inventors: Haixiang Liang, Yixian Liu
  • Publication number: 20180302183
    Abstract: An ONU comprises a receiver configured to receive a continuous-mode TDMA downstream signal from an OLT; a PD coupled to the receiver and configured to convert the continuous-mode TDMA downstream signal to an electrical signal or an RF signal; an ADC coupled to the PD and configured to convert the electrical signal or the RF signal to a digital signal; and a burst-mode data recovery stage coupled to the ADC and configured to perform data recovery on a segment of the digital signal corresponding to the ONU, the burst-mode data recovery stage comprises a synchronization stage configured to perform synchronization on the segment.
    Type: Application
    Filed: March 8, 2018
    Publication date: October 18, 2018
    Inventors: Xiang Liu, Frank Effenberger, Huaiyu Zeng, Guozhu Long, Haixiang Liang
  • Publication number: 20180175908
    Abstract: A digital subscriber line (DSL) network device for coupling to DSL communication lines, the network device comprising: multiplexing circuitry that transmits signals to vector-compliant consumer premises equipment (CPE) and legacy CPE via the DSL communication lines; and processing circuitry configured to: initiate transmission of a predetermined set of orthogonal pilot sequences to a plurality of vector-compliant CPEs; initiate transmission of data symbols corresponding to the set of orthogonal pilot sequences to one or more legacy CPEs; pre-process line errors of a victim vector-compliant CPE to remove far-end crosstalk due to the vector compliant disturber lines and perform the same pre-processing for the transmitted data symbols; determine far-end channel crosstalk information using a correlation of the pre-processed line errors and the pre-processed transmitted data symbols; and reduce far-end channel crosstalk of the victim vector-compliant CPE using the determined far-end channel crosstalk information.
    Type: Application
    Filed: January 19, 2017
    Publication date: June 21, 2018
    Inventors: Haixiang Liang, Yujie He, Jianping Tu
  • Patent number: 9985685
    Abstract: A method comprising allocating one or more detection tones of a sync symbol for crosstalk-free feedback data estimation, wherein the one or more detection tones are a quiet signal; transmitting the one or more detection tones to a computing device, receiving the crosstalk-free feedback data from the computing device, wherein the crosstalk-free feedback data comprises data associated with a background noise detected during the detection tones; determining an optimized PSD based at least in part on the crosstalk-free feedback data; and adjusting a transmission PSD of a plurality of tones based at least in part on the optimized PSD.
    Type: Grant
    Filed: September 22, 2015
    Date of Patent: May 29, 2018
    Assignee: Futurewei Technologies, Inc.
    Inventors: Hui Yin, Zhong Pan, Jianping Tu, Haixiang Liang
  • Patent number: 9935684
    Abstract: A method for implementing an upstream symbol alignment within a network component, the method comprising receiving an upstream sync signal via an initializing digital subscriber line (DSL) during a channel discovery phase from a customer premise equipment (CPE), determining a corrected upstream symbol alignment value based upon the upstream sync signal, and transmitting the corrected upstream symbol alignment value to the CPE, wherein the upstream symbol alignment value determines an upstream symbol alignment for one or more upstream transmissions, and wherein the corrected upstream symbol alignment value is determined before receiving a plurality of upstream data signals within the data symbol positions during the channel discovery phase.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: April 3, 2018
    Assignee: FUTUREWEI TECHNOLOGIES, INC.
    Inventors: Haixiang Liang, Yixian Liu
  • Publication number: 20180054235
    Abstract: A method for implementing an upstream symbol alignment within a network component, the method comprising receiving an upstream sync signal via an initializing digital subscriber line (DSL) during a channel discovery phase from a customer premise equipment (CPE), determining a corrected upstream symbol alignment value based upon the upstream sync signal, and transmitting the corrected upstream symbol alignment value to the CPE, wherein the upstream symbol alignment value determines an upstream symbol alignment for one or more upstream transmissions, and wherein the corrected upstream symbol alignment value is determined before receiving a plurality of upstream data signals within the data symbol positions during the channel discovery phase.
    Type: Application
    Filed: October 17, 2017
    Publication date: February 22, 2018
    Inventors: Haixiang LIANG, Yixian LIU
  • Publication number: 20170041045
    Abstract: A method for implementing an upstream symbol alignment within a network component, the method comprising receiving an upstream sync signal via an initializing digital subscriber line (DSL) during a channel discovery phase from a customer premise equipment (CPE), determining a corrected upstream symbol alignment value based upon the upstream sync signal, and transmitting the corrected upstream symbol alignment value to the CPE, wherein the upstream symbol alignment value determines an upstream symbol alignment for one or more upstream transmissions, and wherein the corrected upstream symbol alignment value is determined before receiving a plurality of upstream data signals within the data symbol positions during the channel discovery phase.
    Type: Application
    Filed: September 16, 2016
    Publication date: February 9, 2017
    Inventors: Haixiang LIANG, Yixian LIU
  • Patent number: 9473339
    Abstract: A method for implementing an upstream symbol alignment within a network component, the method comprising receiving an upstream sync signal via an initializing digital subscriber line (DSL) during a channel discovery phase from a customer premise equipment (CPE), determining a corrected upstream symbol alignment value based upon the upstream sync signal, and transmitting the corrected upstream symbol alignment value to the CPE, wherein the upstream symbol alignment value determines an upstream symbol alignment for one or more upstream transmissions, and wherein the corrected upstream symbol alignment value is determined before receiving a plurality of upstream data signals within the data symbol positions during the channel discovery phase.
    Type: Grant
    Filed: April 10, 2014
    Date of Patent: October 18, 2016
    Assignee: Futurewei Technologies, Inc.
    Inventors: Haixiang Liang, Yixian Liu
  • Publication number: 20160105215
    Abstract: A method of cancelling crosstalk including receiving, by a vector processor, a first signal from a first medium and a second signal from a second medium, wherein the first medium is different from the second medium, determining, using the vector processor, vectoring coefficients based on the first signal and the second signal received, cancelling, using the vector processor, the crosstalk from at least one of the first medium to the second medium and the second medium to the first medium using the vectoring coefficients determined, and transmitting or demodulating corrected signals following the cancellation of the crosstalk.
    Type: Application
    Filed: October 14, 2015
    Publication date: April 14, 2016
    Inventors: Xiang Wang, Haixiang Liang
  • Publication number: 20160094273
    Abstract: A method comprising allocating one or more detection tones of a sync symbol for crosstalk-free feedback data estimation, wherein the one or more detection tones are a quiet signal; transmitting the one or more detection tones to a computing device, receiving the crosstalk-free feedback data from the computing device, wherein the crosstalk-free feedback data comprises data associated with a background noise detected during the detection tones; determining an optimized PSD based at least in part on the crosstalk-free feedback data; and adjusting a transmission PSD of a plurality of tones based at least in part on the optimized PSD.
    Type: Application
    Filed: September 22, 2015
    Publication date: March 31, 2016
    Inventors: Hui Yin, Zhong Pan, Jianping Tu, Haixiang Liang
  • Patent number: 9020145
    Abstract: A digital subscriber line access multiplexer (DSLAM) configured to couple to a first subscriber line and a second subscriber line, wherein the DSLAM comprises at least one transmitter configured to transmit a first signal onto the first subscriber line in a first time slot, transmit a second signal onto the second subscriber line in the first time slot, wherein the first and second signals are linearly related and are intended for a first customer premise equipment (CPE), transmit a third signal onto the second subscriber line in a second time slot, and transmit a fourth signal onto the first subscriber line in the second time slot, wherein the third and fourth signals are linearly related and are intended for a second CPE.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: April 28, 2015
    Assignee: Futurewei Technologies, Inc.
    Inventors: Haixiang Liang, Dong Wei
  • Patent number: 8989063
    Abstract: A method of far-end crosstalk (FEXT) channel estimation in a digital subscriber line (DSL) system, wherein the DSL system comprises a first subscriber line and a second subscriber line, the method comprising allocating a plurality of time slots, wherein the plurality of time slots comprises a first period and a second period, wherein the first period precedes the second period, and wherein each of the first and second periods comprises at least one time slot, transmitting at least one training symbol in the first period onto the second subscriber line in a downstream direction while no transmission is made on the first subscriber line, receiving at least one feedback symbol in the second period from the first subscriber line in an upstream direction, and estimating a level of downstream FEXT from the second subscriber line into the first subscriber line based on the at least one feedback symbol.
    Type: Grant
    Filed: November 12, 2012
    Date of Patent: March 24, 2015
    Assignee: Futurewei Technologies, Inc.
    Inventors: Haixiang Liang, Yuchen Jia, Chin Ngek Hung
  • Patent number: 8964884
    Abstract: An apparatus configured to couple to a plurality of subscriber lines comprising a plurality of transmitters configured to couple to a plurality of physical channels and at least one virtual channel. The number of physical channels equals the number of subscriber lines. A processor is configured to compute a precoder matrix to minimize an error value. The error value accounts for an error on each channel subject to a constraint on power for each channel. A precoder is coupled to the processor and configured to use the precoder matrix to jointly process a plurality of data signals to generate a plurality transmit signals for the plurality of physical channels and the at least one virtual channel.
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: February 24, 2015
    Assignee: Futurewei Technologies, Inc.
    Inventors: Xiao Liang, Chin Ngek Hung, Haixiang Liang
  • Publication number: 20140307749
    Abstract: A method for implementing an upstream symbol alignment within a network component, the method comprising receiving an upstream sync signal via an initializing digital subscriber line (DSL) during a channel discovery phase from a customer premise equipment (CPE), determining a corrected upstream symbol alignment value based upon the upstream sync signal, and transmitting the corrected upstream symbol alignment value to the CPE, wherein the upstream symbol alignment value determines an upstream symbol alignment for one or more upstream transmissions, and wherein the corrected upstream symbol alignment value is determined before receiving a plurality of upstream data signals within the data symbol positions during the channel discovery phase.
    Type: Application
    Filed: April 10, 2014
    Publication date: October 16, 2014
    Applicant: Futurewei Technologies, Inc.
    Inventors: Haixiang Liang, Yixian Liu
  • Patent number: 8842991
    Abstract: A method in a network device for providing end-to-end connection in a unified optical and coax network, comprising receiving at an integrated node device (IND) a frame from an optical line terminal (OLT), wherein the frame comprises a data frame and a logical link identifier (LLID), and placing the data in a one of a plurality of buffers based on the LLID, wherein the one of the plurality of buffers corresponds to a customer premises equipment (CPE) associated with the LLID, wherein the data frame stays intact in a media access control (MAC) layer.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: September 23, 2014
    Assignee: Futurewei Technologies, Inc.
    Inventors: Haixiang Liang, Liming Fang, Jim Chen, Hesham El Bakoury
  • Publication number: 20140185701
    Abstract: An apparatus configured to couple to a plurality of subscriber lines comprising a plurality of transmitters configured to couple to a plurality of physical channels and at least one virtual channel, wherein the number of physical channels equals the number of subscriber lines, a processor configured to compute a precoder matrix to minimize an error value, wherein the error value accounts for an error on each channel subject to a constraint on power for each channel, and a precoder coupled to the processor and configured to use the precoder matrix to jointly process a plurality of data signals to generate a plurality transmit signals for the plurality of physical channels and the at least one virtual channel.
    Type: Application
    Filed: December 31, 2012
    Publication date: July 3, 2014
    Applicant: FUTUREWEI TECHNOLOGIES, INC.
    Inventors: Xiao Liang, Chin Ngek Hung, Haixiang Liang, Zhi Ding
  • Publication number: 20140161000
    Abstract: A method in a time-division duplex (TDD) transceiver coupled to a subscriber line, the method comprising receiving a discrete multitone (DMT) signal from a second transceiver after a period of inactivity on the subscriber line, wherein the DMT signal comprises a plurality of pilot tones, and determining a timing offset between the transceiver and the second transceiver based on the plurality of pilot tones.
    Type: Application
    Filed: March 13, 2013
    Publication date: June 12, 2014
    Applicant: FUTUREWEI TECHNOLOGIES, INC.
    Inventors: Amir H. Fazlollahi, Haixiang Liang