Patents by Inventor Sameep Dave

Sameep Dave 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).

  • Publication number: 20120189324
    Abstract: A soft-decision forward error correction scheme for received optical signals is described. Differential decoding may be performed, for example, in each polarization after coherent QPSK detection. Hard decisions may be made based on judging the most likely transition between each pair of received input symbols. Soft-input generation is also described, representing the reliability of the hard decisions. The soft-input information may be generated through simplified algorithms that utilize the most likely transitions to determine a reliability assignment.
    Type: Application
    Filed: August 8, 2011
    Publication date: July 26, 2012
    Applicant: VIASAT, INC.
    Inventors: Fan Mo, Sameep Dave
  • Publication number: 20120189319
    Abstract: Polarization mode dispersion (PMD) in a dual-pole optical communications network is compensated for using an adaptive PMD equalizer. The PMD equalizer may include a number of substantially identical filter modules that provide partial outputs which may be combined to form a PMD compensated output. A constant modulus algorithm (CMA)-based equalizer may track PMD across both poles and generates an error signal. The CMA-based equalizer includes a filter bank, and uses an update algorithm and tap/output adjustments based on a difference between combined tap energies and an index, and feedback from a forward error correction code frame synchronizer.
    Type: Application
    Filed: August 8, 2011
    Publication date: July 26, 2012
    Applicant: VIASAT, INC.
    Inventors: Fan Mo, Sameep Dave, Lawrence W. Esker
  • Publication number: 20110047442
    Abstract: Methods, systems, and devices are described for forward error correction for flash memory. Encoded data from flash memory may be used to generate a number of data streams. At each of a number of error detection sub-modules operating in parallel, a different one of the data streams is processed. Each error detection sub-module may detect whether a portion of the respective received stream contains an error, and forward the portion to an error correction module. The error correction module, physically separate from the error detection sub-modules, may correct the forwarded portions of the respective received streams containing an error. The age and error rate associated with the flash memory may be monitored, and a coding rate or other aspects may be dynamically adapted to account for these factors.
    Type: Application
    Filed: August 18, 2010
    Publication date: February 24, 2011
    Applicant: ViaSat, Inc.
    Inventors: Sameep Dave, Russell Fuerst, Mark Kohoot, Jim Keszenheimer, William H. Thesling
  • Patent number: 7760880
    Abstract: A decoder may perform node data reordering for bit node processing and node data reordering for bit node to check node interconnections. The decoder may also utilize a single barrel shifting operation on data read from an edge memory for bit node processing or check node processing during a memory read operation. The decoder may also utilize a single format conversion on data read from an edge memory for bit node processing or check node processing. The decoder may also utilize a simplified check node process for check node processing.
    Type: Grant
    Filed: October 13, 2005
    Date of Patent: July 20, 2010
    Assignee: ViaSat, Inc.
    Inventors: Sameep Dave, Fan Mo
  • Patent number: 7117418
    Abstract: A method of turbo decoding using soft input-soft output information. A vector of data is sampled from a channel of data. The vector of data is then processed to output a final code word of bits. A final reliability vector of reliability values associated with the final code word is generated, such that each bit of the final code word of bits has a corresponding reliability value in the final reliability vector. Corresponding reliability values for one or more bit positions of the final code word are determined by a difference of distance metrics, and corresponding reliability values for one or more bit positions of the final code word are determined utilizing a numerical approximation.
    Type: Grant
    Filed: September 11, 2001
    Date of Patent: October 3, 2006
    Assignee: Comtech AHA Corporation
    Inventors: William H. Thesling, Sameep Dave
  • Publication number: 20060107181
    Abstract: A decoder may perform node data reordering for bit node processing and node data reordering for bit node to check node interconnections. The decoder may also utilize a single barrel shifting operation on data read from an edge memory for bit node processing or check node processing during a memory read operation. The decoder may also utilize a single format conversion on data read from an edge memory for bit node processing or check node processing. The decoder may also utilize a simplified check node process for check node processing.
    Type: Application
    Filed: October 13, 2005
    Publication date: May 18, 2006
    Inventors: Sameep Dave, Fan Mo
  • Publication number: 20020124223
    Abstract: A method of turbo decoding using soft input-soft output information. A vector of data is sampled from a channel of data. The vector of data is then processed to output a final code word of bits. A final reliability vector of reliability values associated with the final code word is generated, such that each bit of the final code word of bits has a corresponding reliability value in the final reliability vector. Corresponding reliability values for one or more bit positions of the final code word are determined by a difference of distance metrics, and corresponding reliability values for one or more bit positions of the final code word are determined utilizing a numerical approximation.
    Type: Application
    Filed: September 11, 2001
    Publication date: September 5, 2002
    Applicant: Efficient Channel Coding, Inc.
    Inventors: William H. Thesling, Sameep Dave