Patents by Inventor Henry D. Pfister

Henry D. Pfister 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).

  • Forward error correction
    Patent number: 9287899
    Abstract: Methods and circuits are disclosed for forward-error-correction (FEC) decoding. A plurality of symbols are received in an interleaved format of rows and columns of the symbols. A plurality of FEC decoding iterations are performed on the plurality of symbols. Each decoding iteration performs FEC decoding of the rows of the plurality of symbols and performs FEC decoding of the columns of the plurality of symbols. After performing the decoding iterations, rows in error and columns in error of the plurality of symbols are determined. In response to the determined rows in error and the determined columns in error matching a deadlock pattern, symbols at intersections of the determined rows and columns in error are determined. Bits of one or more symbols of the determined symbols are inverted. After the inverting of the bits, one or more of the FEC decoding iterations are performed.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: March 15, 2016
    Assignee: XILINX, INC.
    Inventors: Raied N. Mazahreh, Raghavendar M. Rao, Krishna R. Narayanan, Henry D. Pfister
  • Forward error correction
    Patent number: 8959418
    Abstract: In one embodiment, a circuit for FEC decoding includes first and second syndrome calculation circuits, configured to calculate FEC syndromes for rows and columns of symbols in a de-interleaved format, respectively. A decoding circuit is configured to arrange the symbols into windows. Each window includes a plurality of sequential rows and sequential columns of the symbols in the de-interleaved format. The decoding circuit is configured to place N of the windows in a group and perform M decoding iterations of the windows in the group. In each decoding iteration, the decoding circuit performs FEC decoding of rows of each of the windows in the group followed by FEC decoding of columns of each of the windows in the group.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: February 17, 2015
    Assignee: Xilinx, Inc.
    Inventors: Henry D. Pfister, Krishna R. Narayanan, Raied N. Mazahreh, Raghavendar M. Rao
  • Peer-to-peer communications
    Patent number: 8060129
    Abstract: In a multiple-access network, network access terminals conduct peer-to-peer communications on reverse link channels of the network.
    Type: Grant
    Filed: April 14, 2009
    Date of Patent: November 15, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Matthew S. Grob, Rashid A. Attar, Henry D. Pfister, Klein S. Gilhousen, Ramin Rezaiifar
  • Peer-to-Peer Communications
    Publication number: 20100050001
    Abstract: In a multiple-access network, network access terminals conduct peer-to-peer communications on reverse link channels of the network.
    Type: Application
    Filed: April 14, 2009
    Publication date: February 25, 2010
    Inventors: Matthew S. Grob, Rashid A. Attar, Henry D. Pfister, Klein S. Gilhousen, Ramin Rezaiifar
  • Peer-to-peer communications
    Patent number: 7539507
    Abstract: In a multiple-access network, network access terminals conduct peer-to-peer communications on reverse link channels of the network.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: May 26, 2009
    Assignee: QUALCOMM Incorporated
    Inventors: Matthew S. Grob, Rashid A. Attar, Henry D. Pfister, Klein S. Gilhousen, Ramin Rezaiifar