Patents by Inventor Freng-Wei Sun

Freng-Wei Sun 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: 20080082895
    Abstract: An approach for generating a structured Low Density Parity Check (LDPC) codes is provided. Structure of the LDPC codes is provided by restricting a certain part of the parity check matrix to be lower triangular, hence enabling a very simple encoding method that does not require the generator matrix of the code. The approach can also exploit the unequal error protecting capability of LDPC codes on transmitted bits to provide extra error protection to more vulnerable bits of high order modulation constellations (such as 8-PSK (Phase Shift Keying)). Additionally, an efficient decoding scheme is described where both bit nodes and check nodes are partitioned into groups. The edge values associated with each of the group can be placed together in memory simultaneously for bit nodes groups and check nodes groups. This architecture allows the multiple edges to be fetched from memory at a single clock cycle.
    Type: Application
    Filed: November 9, 2007
    Publication date: April 3, 2008
    Applicant: The DIRECTV Group, Inc.
    Inventors: Mustafa Eroz, Freng-Wei Sun, Lin-Nan Lee