Patents by Inventor Xiao M. Gao

Xiao M. Gao 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: 7486724
    Abstract: Methods and apparatus to perform and/or analyze communication channels are described. In one embodiment, a test signal may be generated and transferred using a first signal route to a line-under-test in response to line qualification mode. The first signal route may include a compensation device to modify the test signal. In some embodiments, a reflected signal from the line-under-test may be received in response to the test signal. A second signal route may be utilized to route the reflected signal in response to line qualification mode.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: February 3, 2009
    Assignee: Intel Corporation
    Inventors: Xiao M. Gao, Wesley H. Smith
  • Patent number: 7072462
    Abstract: A system for determining whether a telephone loop is capable of carrying a Digital Subscriber Line (DSL) signal. A Constant Amplitude Zero Auto Correlation (CAZAC) sequence signal is generated and transmitted through the loop plant to a central office and the received echo signal is processed using second-order statistics. The second-order statistics calculation permits determination of the echo signal amplitude and time between the echo signal and sequence signal. The echo signal amplitude and time may be used to obtain telephone loop characteristics such as loop length.
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: July 4, 2006
    Assignee: Intel Corporation
    Inventors: Wesley H. Smith, Veda Krishnan, Xiao M. Gao, Kanna Krishnan
  • Patent number: 7020246
    Abstract: An apparatus and technique for determining whether a telephone loop is capable of carrying a Digital Subscriber Line (DSL) signal. Time domain reflected (TDR) signals that are echoes of transmit impulse signals are processed using time domain echo averaging and echo enhancement using second-order statistics. Each technique allows clearer visualization of the TDR echo signal by reducing the noise and distortion present in the TDR signals. These statistical signal processing techniques allow determination of telephone loop characteristics such as loop length once the TDR echo signal amplitude and time index are calculated.
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: March 28, 2006
    Assignee: Intel Corporation
    Inventors: Xiao M. Gao, Wesley H. Smith, Veda Krishnan, Kanna Krishnan
  • Publication number: 20040264685
    Abstract: A system for determining whether a telephone loop is capable of carrying a Digital Subscriber Line (DSL) signal. A Constant Amplitude Zero Auto Correlation (CAZAC) sequence signal is generated and transmitted through the loop plant to a central office and the received echo signal is processed using second-order statistics. The second-order statistics calculation permits determination of the echo signal amplitude and time between the echo signal and sequence signal. The echo signal amplitude and time may be used to obtain telephone loop characteristics such as loop length.
    Type: Application
    Filed: June 30, 2003
    Publication date: December 30, 2004
    Inventors: Wesley H. Smith, Veda Krishnan, Xiao M. Gao, Kanna Krishnan
  • Publication number: 20040267678
    Abstract: An apparatus and technique for Digital Subscriber Line (DSL) telephone loop qualification that includes a fuzzy logic impedance mismatch network. The impedance mismatch network is used to increase the received echo of a transmit pulse signal to determine the telephone loop characteristics.
    Type: Application
    Filed: June 30, 2003
    Publication date: December 30, 2004
    Inventors: Xiao M. Gao, Wesley H. Smith, Veda Krishnan, Kanna Krishnan
  • Publication number: 20040264684
    Abstract: An apparatus and technique for determining whether a telephone loop is capable of carrying a Digital Subscriber Line (DSL) signal. Time domain reflected (TDR) signals that are echoes of transmit impulse signals are processed using time domain echo averaging and echo enhancement using second-order statistics. Each technique allows clearer visualization of the TDR echo signal by reducing the noise and distortion present in the TDR signals. These statistical signal processing techniques allow determination of telephone loop characteristics such as loop length once the TDR echo signal amplitude and time index are calculated.
    Type: Application
    Filed: June 30, 2003
    Publication date: December 30, 2004
    Inventors: Xiao M. Gao, Wesley H. Smith, Veda Krishnan, Kanna Krishnan
  • Publication number: 20040247024
    Abstract: Briefly, a system that may perform line qualification within a mass-manufacturable modem.
    Type: Application
    Filed: June 6, 2003
    Publication date: December 9, 2004
    Inventors: Xiao M. Gao, Wesley H. Smith, Chunming Han