Patents by Inventor Syed Faisal Ali Shah

Syed Faisal Ali Shah 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: 10505768
    Abstract: An apparatus in a signal receiver, such as an optical signal receiver, is provided. An adaptive equalizer provides an equalized output indicative of a received signal. A feedback component receives the equalized output and provides feedback to the adaptive equalizer. A carrier recovery component receives the equalized output from the adaptive equalizer provides estimates of symbols. The carrier recovery component is partially or fully disjoint from the feedback component, thus removing the carrier recovery component from equalizer the feedback loop. The feedback component can include an initial carrier recovery component and a phase rotation and detection component. The initial carrier recovery component generates a carrier recovery output based on the equalized output. The phase rotation and detection component performs a phase rotation based on the carrier recovery output.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: December 10, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Nash'at Abughalieh, Syed Faisal Ali Shah, Chuandong Li
  • Patent number: 10439856
    Abstract: A method for efficient generation of a narrowband IoT uplink signal includes generating an under-sampled sequence of samples of a narrowband IoT uplink signal, identifying symbol boundaries in the sequence of samples that do not correspond to sample times, for each symbol boundary that does not correspond to one of the sample times: extrapolating, from a signal phase value for a sample at a last sample time before the symbol boundary, a signal phase value for a sample at a first sample time after the symbol boundary; calculating and applying a phase jump to the sample at the first sample time after the symbol boundary to generate a new phase value for the sample at the first sample time after the symbol boundary, wherein the phase jump is applied from the phase value extrapolated from the last sample time before the symbol boundary; and using the new phase value for the first sample time after the symbol boundary to calculate amplitude of the sample at the first sample time after the symbol boundary.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: October 8, 2019
    Assignee: Keysight Technologies, Inc.
    Inventors: Syed Faisal Ali Shah, Roger Alan Slyk
  • Publication number: 20190182082
    Abstract: An apparatus in a signal receiver, such as an optical signal receiver, is provided. An adaptive equalizer provides an equalized output indicative of a received signal. A feedback component receives the equalized output and provides feedback to the adaptive equalizer. A carrier recovery component receives the equalized output from the adaptive equalizer provides estimates of symbols. The carrier recovery component is partially or fully disjoint from the feedback component, thus removing the carrier recovery component from equalizer the feedback loop. The feedback component can include an initial carrier recovery component and a phase rotation and detection component. The initial carrier recovery component generates a carrier recovery output based on the equalized output. The phase rotation and detection component performs a phase rotation based on the carrier recovery output.
    Type: Application
    Filed: December 12, 2017
    Publication date: June 13, 2019
    Applicant: Huawei Technologies Co., Ltd.
    Inventors: Nash'at Abughalieh, Syed Faisal Ali Shah, Chuandong Li
  • Patent number: 9871597
    Abstract: A method and apparatus is described for estimating a local oscillator frequency offset (LOFO) of a received optical signal in a coherent optical receiver.
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: January 16, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Mohsen Nader Tehrani, Syed Faisal Ali Shah, Zhuhong Zhang, Chuandong Li
  • Publication number: 20170294971
    Abstract: A method and apparatus is described for estimating a local oscillator frequency offset (LOFO) of a received optical signal in a coherent optical receiver.
    Type: Application
    Filed: April 11, 2016
    Publication date: October 12, 2017
    Inventors: Mohsen Nader Tehrani, Syed Faisal Ali Shah, Zhuhong Zhang, Chuandong Li
  • Publication number: 20170257234
    Abstract: An apparatus for performing fractionally spaced adaptive equalization with non-integer sub-symbol sampling has an adaptive equalizer that receives a continuous stream of input data having a non-integer, fractional delay between consecutive samples at a non-integer, sub-symbol rate and outputs a stream of equalized data based on tap weights of taps of the adaptive equalizer that are spaced at an interval corresponding to the non-integer, sub-symbol rate. The tap weights are updated independently of the fractional delay between consecutive samples of the input data using an error signal. An equalizer output alignment component downstream of the adaptive equalizer aligns the stream of equalized data with a corresponding transmitted symbol.
    Type: Application
    Filed: August 4, 2016
    Publication date: September 7, 2017
    Inventors: Syed Faisal Ali Shah, Chuandong Li, Zhuhong Zhang
  • Patent number: 9755864
    Abstract: An apparatus for performing fractionally spaced adaptive equalization with non-integer sub-symbol sampling has an adaptive equalizer that receives a continuous stream of input data having a non-integer, fractional delay between consecutive samples at a non-integer, sub-symbol rate and outputs a stream of equalized data based on tap weights of taps of the adaptive equalizer that are spaced at an interval corresponding to the non-integer, sub-symbol rate. The tap weights are updated independently of the fractional delay between consecutive samples of the input data using an error signal. An equalizer output alignment component downstream of the adaptive equalizer aligns the stream of equalized data with a corresponding transmitted symbol.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: September 5, 2017
    Assignee: HUAWEI TECHNOLOGIES CO., LTD
    Inventors: Syed Faisal Ali Shah, Chuandong Li, Zhuhong Zhang
  • Patent number: 9112742
    Abstract: An apparatus comprising a memory and a processor coupled to the memory, wherein the memory includes instructions that when executed by the processor cause the apparatus to perform the following receive an incoming signal at a sampling rate that is greater than a symbol rate associated with the incoming signal, replicate a plurality of data streams from the incoming signal, apply a plurality of fractional delays for the data streams, and perform an adaptive equalization on a plurality of data blocks generated from the data streams, wherein the fractional delay is applied to the data streams independently of the adaptive equalization, and wherein the adaptive equalization implements taps spaced at a fraction of a symbol interval associated with the incoming signal.
    Type: Grant
    Filed: May 14, 2014
    Date of Patent: August 18, 2015
    Assignee: Futurewei Technologies, Inc.
    Inventors: Syed Faisal Ali Shah, Chuandong Li, Zhuhong Zhang
  • Publication number: 20140341267
    Abstract: An apparatus comprising a memory and a processor coupled to the memory, wherein the memory includes instructions that when executed by the processor cause the apparatus to perform the following receive an incoming signal at a sampling rate that is greater than a symbol rate associated with the incoming signal, replicate a plurality of data streams from the incoming signal, apply a plurality of fractional delays for the data streams, and perform an adaptive equalization on a plurality of data blocks generated from the data streams, wherein the fractional delay is applied to the data streams independently of the adaptive equalization, and wherein the adaptive equalization implements taps spaced at a fraction of a symbol interval associated with the incoming signal.
    Type: Application
    Filed: May 14, 2014
    Publication date: November 20, 2014
    Applicant: Futurewei Technologies, Inc.
    Inventors: Syed Faisal Ali Shah, Chuandong Li, Zhuhong Zhang