Inventors:
Chuxiang Li - New York NY, US
Guosen Yue - Plainsboro NJ, US
Mohammad A. Khojastepour - Plainsboro NJ, US
Xiaodong Wang - New York NY, US
Mohammad Madihian - Plainsboro NJ, US
Assignee:
NEC Laboratories America, Inc. - Princeton NJ
International Classification:
H03M 13/00
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.