Patents by Inventor Douglas Whitcomb

Douglas Whitcomb 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).

  • Decision feedback equalization with fractionally-spaced feedback data
    Patent number: 7580455
    Abstract: A decision feedback equalizer (DFE) architecture uses feedback samples that are over-sampled with respect to the symbol rate. On-baud feedback samples are quantized with a slicer, while off-baud samples are linear, IIR samples. Both forward and feedback filters are fractionally-spaced, but adapted only at the baud instances.
    Type: Grant
    Filed: March 18, 2008
    Date of Patent: August 25, 2009
    Inventors: Thomas J. Endres, Douglas Whitcomb, Christopher David Long, Wonzoo Chung
  • DECISION FEEDBACK EQUALIZATION WITH FRACTIONALLY-SPACED FEEDBACK DATA
    Publication number: 20080232454
    Abstract: A decision feedback equalizer (DFE) architecture uses feedback samples that are over-sampled with respect to the symbol rate. On-baud feedback samples are quantized with a slicer, while off-baud samples are linear, IIR samples. Both forward and feedback filters are fractionally-spaced, but adapted only at the baud instances.
    Type: Application
    Filed: March 18, 2008
    Publication date: September 25, 2008
    Inventors: Thomas J. Endres, Douglas Whitcomb, Christopher David Long, Wonzoo Chung
  • Decision feedback equalization with fractionally-spaced feedback data
    Patent number: 7346105
    Abstract: A decision feedback equalizer (DFE) architecture uses feedback samples that are over-sampled with respect to the symbol rate. On-baud feedback samples are quantized with a slicer, while off-baud samples are linear, IIR samples. Both forward and feedback filters are fractionally-spaced, but adapted only at the baud instances.
    Type: Grant
    Filed: April 26, 2004
    Date of Patent: March 18, 2008
    Assignee: Dotcast, Inc.
    Inventors: Thomas J. Endres, Douglas Whitcomb, Christopher David Long, Wonzoo Chung
  • Decision feedback equalization with fractionally-spaced feedback data
    Publication number: 20050018765
    Abstract: A decision feedback equalizer (DFE) architecture uses feedback samples that are over-sampled with respect to the symbol rate. On-baud feedback samples are quantized with a slicer, while off-baud samples are linear, IIR samples. Both forward and feedback filters are fractionally-spaced, but adapted only at the baud instances.
    Type: Application
    Filed: April 26, 2004
    Publication date: January 27, 2005
    Inventors: Thomas Endres, Douglas Whitcomb, Christopher Long, Wonzoo Chung