The paper is about bounds for LDPC and LDGM codes under MAP. A new method for analyzing low density parity check (LDPC) codes and low density generator matrix (LDGM) codes under bit maximum a posteriori probability (MAP) decoding is introduced. T

提出了一种码率码长灵活变化的准循环低密度奇偶校验(Quasi - Cyclic Low Density Parity Check, QC - LDPC)码,利用构造出的H 矩阵可以达到较大的圈长( girth)值,并能在 girth值不变的前提下实现码率码长的灵活变化-Puts forward a bit rate code length of flexible change must circulation Low Density parity (Quasi-Cyclic Low De

　文章提出了一种可以兼容不同码率规则和非规则准循环低密度校验码(LDPC)的部分并行译码结构, 用Verilog语言开发，基于该部分并行结构在Altera公司的StratixII-EP2S90器件上验-This paper presents a part of different bit rates can be compatible with the rules and irregular quasi-cyclic low density parity check code (LDPC) de

A novel class of bit-flipping (BF) algorithms for decoding low-density parity-check (LDPC) codes is presented. The proposed algorithms, which are called gradient descent bit flipping (GDBF) algorithms, can be regarded as simplified gradient d