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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
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Low-density parity-check (LDPC) codes are a class of linear block LDPC
codes. The name comes from the characteristic of their parity-check
matrix which contains only a few 1’s in comparison to the amount of
0’s. Their main advantage is that the
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In this paper, we present two encoding methods for
block-circulant LDPC codes. The first is an iterative encoding
method based on the erasure decoding algorithm, and the
computations required are well organized due to the blockcirculant
struc
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it is a ldpc parity check matrix
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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
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this an implementation of ldpc encoder and decoder in matlab. generator matrix, parity check matrix and the chennel are implemented seperately. the bit error rate performance is estimated for the ldpc code -this is an implementation of ldpc encoder a
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Low-density parity-check (LDPC) codes have recently
emerged due to their excellent performance. However, the
parity check (H) matrices of the previous works are not
adequate for hardware implementation of encoders or
decoders. This paper prop
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针对LDPC码在理论和实现两方面分别进行了较深的研究。深入了解了LDPC码编码方法、译码方法以及性能等知识，重点研究了用MATLAB如何构造奇偶校验矩阵、如何编码和如何解码的算法，而且实现了在相同码率、信噪比下LDPC码性能与卷积码性能的对比。-LDPC codes for both theory and implementation were carried out deeper study. In-depth understanding of the LDPC coding method,
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一种新型的建筑不规则低密度
奇偶检验基于所述修改（LDPC）码
渐进边增长（PEG）的算法。边缘
所述PEG算法的位置是由利用所述Sum-增强
积算法在奇偶校验矩阵的设计。该
提出的算法是在块长度和速度非常灵活。
被提议的方法构建代码的测试
AWGN信道和显著的性能改进
实现。建议解码器优化的灵活性
动作，然后由它的使用在修改所述改进的示
PEGIPEGI）算法来实现进一步的性能提升。-A novel construction for irregular
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LDPC学者的入门书籍，详细介绍了校验矩阵的构造方法，译码方法以及性能分析方法及其数学原理。(LDPC scholar's introductory books, detailing the construction of parity check matrix method, decoding methods and performance analysis methods and their mathematical principles.)
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