Xiadong Wang from Edgewater, NJ, age 60

Ldpc Hard Decision Decoder For High-Speed Wireless Data Communications
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US Patent:

8352827, Jan 8, 2013
Filed:

Jun 25, 2010
Appl. No.:

12/823400
Inventors:

Chen Gong - New York NY, US
Guosen Yue - Plainsboro NJ, US
Xiadong Wang - New York NY, US
Assignee:

NEC Laboratories America, Inc. - Princeton NJ
International Classification:

H03M 13/00
H03M 13/03
US Classification:

714752, 714758, 714786, 714792
Abstract:

A method for low-density parity-check hard decision decoding includes computing, for every decoding iteration, a discrepancy of extrinsic messages responsive to channel inputs of a receiver, performing a flipping of the channel inputs responsive to a comparison of the discrepancy of extrinsic messages to a flipping threshold, the flipping threshold for each decoding iteration being determined based on a threshold computation responsive to a channel error probability estimation in a first iteration of a decoding of the channel inputs, and check node decoding responsive to the flipping of channel inputs.

System And Method For Low-Density Parity Check (Ldpc) Code Design
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US Patent:

20070113146, May 17, 2007
Filed:

Sep 21, 2006
Appl. No.:

11/533978
Inventors:

Chuxiang Li - New York NY, US
Guosen Yue - Plainsboro NJ, US
Mohammad Khojastepour - Plainsboro NJ, US
Xiadong Wang - New York NY, US
Mohammad Madihian - Plainsboro NJ, US
Assignee:

NEC LABORATORIES AMERICA, INC. - Princeton NJ
International Classification:

H03M 13/00
US Classification:

714758000
Abstract:

Disclosed is a density evolution algorithm based on a refined definition of node and edge densities for different parts of the code. In particular, density functions ƒ(i) and ƒ(i) of the output edges of the variable nodes with degree i within different codeword regions wand w, respectively, are defined and then calculated. Further, density functions ƒ(j) and ƒ(j) of the output edges for check nodes with degree j within codeword regions wand w, respectively, are defined and then calculated. Mixture density functions of output check edges connecting variable nodes in the first codeword region and the second codeword region are then calculated to determine an LDPC code design.

Xiadong Wang