Patents by Inventor Rose Y. Shao

Rose Y. Shao 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).

  • Selectively applied hybrid min-sum approximation for constraint node updates of LDPC decoders
    Patent number: 8156409
    Abstract: In accordance with one or more embodiments, a decoder may determine whether a lowest reliability value of a plurality of codeword bits that correspond to a particular output reliability value for a particular constraint node of a parity-check matrix is greater than a threshold value (e.g., an offset), and if so, selectively applies a modified min-sum approximation constraint node update with a reliability value modification (e.g., an offset or normalized min-sum approximation).
    Type: Grant
    Filed: February 29, 2008
    Date of Patent: April 10, 2012
    Assignee: Seagate Technology LLC
    Inventors: Ara Patapoutian, Rose Y. Shao, Arvind Sridharan
  • Defect sensing Viterbi based detector
    Patent number: 7752531
    Abstract: A detector includes a Viterbi based detector and an erasure detector that detects as erasures one or more bits associated with a decoding window in which survivor paths do not merge within the decoding window.
    Type: Grant
    Filed: September 12, 2007
    Date of Patent: July 6, 2010
    Assignee: Seagate Technology LLC
    Inventors: Ara Patapoutian, Rose Y. Shao
  • SELECTIVELY APPLIED HYBRID MIN-SUM APPROXIMATION FOR CONSTRAINT NODE UPDATES OF LDPC DECODERS
    Publication number: 20090222710
    Abstract: In accordance with one or more embodiments, a decoder may determine whether a lowest reliability value of a plurality of codeword bits that correspond to a particular output reliability value for a particular constraint node of a parity-check matrix is greater than a threshold value (e.g., an offset), and if so, selectively applies a modified min-sum approximation constraint node update with a reliability value modification (e.g., an offset or normalized min-sum approximation).
    Type: Application
    Filed: February 29, 2008
    Publication date: September 3, 2009
    Inventors: Ara Patapoutian, Rose Y. Shao, Arvind Sridharan
  • Parallel maximum a posteriori detectors that generate soft decisions for a sampled data sequence
    Patent number: 7555070
    Abstract: A soft decision value output detector includes a plurality of maximum a posteriori (MAP) detectors. The MAP detectors are connected in parallel, and configured to simultaneously generate state metrics for portions of a sampled data sequence, and to generate soft decision values based on the generated state metrics. The MAP detectors may generate soft decision values in a fixed latency manner and without buffering the sampled data sequence for a whole sector of a disk in a disk drive. The MAP detectors may generate soft decision values for portions of the sampled data sequence at least at a rate at which the portions of the sampled data sequence are input to the MAP detectors.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: June 30, 2009
    Assignee: Maxtor Corporation
    Inventors: Bengt A. Ulriksson, Rose Y. Shao
  • DEFECT SENSING VITERBI BASED DETECTOR
    Publication number: 20090070658
    Abstract: During decoding using a Viterbi based detector, erasures are detected when surviving paths do not merge in an associated decoding window.
    Type: Application
    Filed: September 12, 2007
    Publication date: March 12, 2009
    Inventors: Ara Patapoutian, Rose Y Shao