Patents by Inventor Ambighairajah Yasotharan

Ambighairajah Yasotharan 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).

  • Impulse response shortening and symbol synchronization in OFDM communication systems
    Patent number: 7421029
    Abstract: A method for receiving at a receiver having a variable filter a transmitted signal that includes a periodic training signal. The method includes (a) receiving and sampling the transmitted signal at the receiver to produce a digital complex baseband signal; (b) filtering the digital complex baseband signal with the variable filter; (c) detecting the periodic training signal in the filtered digital complex baseband signal; (d) determining a desired channel impulse response based on the detected periodic training signal; (e) calculating filter coefficients required by the variable filter to achieve the desired channel impulse response; and (f) adjusting the variable filter according to the calculated filter coefficients. A receiver for implementing the method is also provided.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: September 2, 2008
    Assignee: Unique Broadband Systems, Inc.
    Inventors: Ambighairajah Yasotharan, Dmitri Korobkov
  • Impulse response shortening and symbol synchronization in OFDM communication systems
    Publication number: 20040120409
    Abstract: A method for receiving at a receiver having a variable filter a transmitted signal that includes a periodic training signal. The method includes (a) receiving and sampling the transmitted signal at the receiver to produce a digital complex baseband signal; (b) filtering the digital complex baseband signal with the variable filter; (c) detecting the periodic training signal in the filtered digital complex baseband signal; (d) determining a desired channel impulse response based on the detected periodic training signal; (e) calculating filter coefficients required by the variable filter to achieve the desired channel impulse response; and (f) adjusting the variable filter according to the calculated filter coefficients. A receiver for implementing the method is also provided.
    Type: Application
    Filed: December 20, 2002
    Publication date: June 24, 2004
    Inventors: Ambighairajah Yasotharan, Dmitri Korobkov