Patents by Inventor Andrew Kan

Andrew Kan 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: 7116957
    Abstract: The velocity of a wireless communications device (106) is estimated. In response to this estimate, a filter bandwidth, such as a pilot filter (310) bandwidth, is adjusted so that the introduction of noise and distortion to a signal received by the device is mitigated. The filter bandwidth is adjusted by increasing it as the estimated velocity increases; and decreasing it as the estimated velocity decreases. Such adjustments may be accomplished through providing a number of predetermined bandwidths that each correspond to a particular velocity range, and setting the filter bandwidth to the predetermined bandwidth that corresponds to the estimated velocity.
    Type: Grant
    Filed: October 22, 2001
    Date of Patent: October 3, 2006
    Assignee: QUALCOMM Incorporated
    Inventors: Gilbert Christopher Sih, Andrew Kan, Stein A. Lundby, Shimman Patel
  • Publication number: 20050020219
    Abstract: The velocity of a wireless communications device (106) is estimated. In response to this estimate, a filter bandwidth, such as a pilot filter (310) bandwidth, is adjusted so that the introduction of noise and distortion to a signal received by the device is mitigated. The filter bandwidth is adjusted by increasing it as the estimated velocity increases; and decreasing it as the estimated velocity decreases. Such adjustments may be accomplished through providing a number of predetermined bandwidths that each correspond to a particular velocity range, and setting the filter bandwidth to the predetermined bandwidth that corresponds to the estimated velocity.
    Type: Application
    Filed: October 22, 2001
    Publication date: January 27, 2005
    Inventors: Gilbert Sih, Andrew Kan, Stein Lundby, Shimman Patel
  • Patent number: 6760362
    Abstract: A method and apparatus to dynamically adjust parameters of a filter for a pilot signal. An incoming signal containing a pilot signal is filtered using non-identical filters, and the magnitudes of the filtered signals are compared to estimate a bandwidth of the pilot signal. Noise in the incoming signal may also be estimated, preferably from a portion of the incoming signal not expected to contain the pilot signal. Based on the comparison of the filtered signal magnitudes, which may be compensated to remove the noise contribution, the parameters of a filter applied to the incoming signal to isolate the pilot signal are varied. The parameters may vary the bandwidth of a pilot signal filter. The non-identical filters used in the pilot signal bandwidth estimation may be IIR or FIR filters having different passbands, or may be a correlation of the incoming signal with sinusoids of different frequencies.
    Type: Grant
    Filed: April 22, 2002
    Date of Patent: July 6, 2004
    Assignee: Qualcomm Incorporated
    Inventors: Shimman Patel, Andrew Kan
  • Publication number: 20030198283
    Abstract: A method and apparatus to dynamically adjust parameters of a filter for a pilot signal. An incoming signal containing a pilot signal is filtered using non-identical filters, and the magnitudes of the filtered signals are compared to estimate a bandwidth of the pilot signal. Noise in the incoming signal may also be estimated, preferably from a portion of the incoming signal not expected to contain the pilot signal. Based on the comparison of the filtered signal magnitudes, which may be compensated to remove the noise contribution, the parameters of a filter applied to the incoming signal to isolate the pilot signal are varied. The parameters may vary the bandwidth of a pilot signal filter. The non-identical filters used in the pilot signal bandwidth estimation may be IIR or FIR filters having different passbands, or may be a correlation of the incoming signal with sinusoids of different frequencies.
    Type: Application
    Filed: April 22, 2002
    Publication date: October 23, 2003
    Inventors: Shimman Patel, Andrew Kan
  • Publication number: 20030065697
    Abstract: A fast, iterative techique for evaluating M modulo J which may be easily implemented in hardware. In the illustrative embodiment, the invention includes a first circuit (10) for decomposing M into two integers A and B=M−A; a second circuit (20) for evaluating (A modulo J); a third circuit (30) for evaluating M′=(A modulo J)+B; and, a fourth circuit (40) for determining whether to output M′ as the final answer, or to feedback M′ to said first means to evaluate M′ modulo J.
    Type: Application
    Filed: October 17, 2001
    Publication date: April 3, 2003
    Inventors: Shimman Patel, Andrew Kan, Rajat Dhawan