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Software for Low Density Parity Check Codes Radford M. Neal Version of 2006-02-08. This collection of programs and modules, written in C, is intended to support research and education concerning Low Density Parity Check (LDPC) codes. (Note, however,
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dmb-th标准中关于LDPC中稀疏矩阵及校验矩阵的源代码，附有校验矩阵-dmb-th standard in on the LDPC check matrix sparse matrix and the source code, with parity matrix
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计算ldpc低密度奇偶校验矩阵中4环的个数。-Ldpc calculated low-density parity-check matrix of the number of ring 4.
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Low density parity check matrix-Descr iption
A program written for generating LDPC matrix in the as pattern as discussed in the research paper , " Time varying periodic convolutional codes with low density parity check
matrix" by Alberto
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Flexible construction of girth-six QC-LDPC Codes-The program constructs girth-six QC-LDPC codes given row-weight,k, column-weight,j, and sub-matrix size,m. The obtained parity-check matrix is stored in H. The construction has flexibility in that j,k
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Construct the short length of QC LDPC codes without girth 4 and girth 6-The Program to construct the short length of QC LDPC codes without girth 4 and girth 6
Copyright (C) Yang XIAO, Jun FAN, BJTU, July 26, 2007, E-Mail: yxiao@bjtu.edu.cn.
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本程序是用来查找LDPC parity-check matrix中的cycle的. 以次可以方便知道girth 的情况.-This program is used to find all the cycles in the parity-check matrix of the LDPC codes. By using this program we can also know the girth condition of our codes.
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这个程序 是用来为QC-LDPC 的parity check matrix 选择 shift values的. 其中 0 matrix 的shift value为-1.-this program is used to assign the shift values for parity-check matrix of the QC-LDPC codes. The shift value of the zero matrix is-1.
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LDPC编码算法,
Create R = 1/2 low density parity check matrix
M : Number of row
N : Number of column
method : Method for distributing non-zero element
{0} Evencol : For each column, place 1s uniformly at random
{1} Evenboth: For each
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lDPC校验矩阵的环检测。包括4环检测算法，6环检测算法及8环检测算法。还包括一个准循环LDPC奇偶校验矩阵的生成算法。-this algrithm can search cycles in LDPC parity check matrix。It contain cycle-4 cycle-6 cycle-8 test algrithm.It also contains a algrithm for generate the LDPC quasi-cyclic parity check matr
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低密度奇偶校验码(简称LDPC码)是目前距离香农限最近的一种线性纠错码，它的直接编码运算量较大，通常具有码长的二次方复杂度．为此，利用有效的校验矩阵，来降低编码的复杂度，同时研究利用大规模集成电路实现LDPC码的编码．在ISE 8．2软件平台上采用基于FPGA的Verilog HDL语言实现了有效的编码过程，为LDPC码的硬件实现和实际应用提供了依据-Abstract：Low．density parity·check code(LDPC code)is a kind of linear eror
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LDPC码即低密度奇偶校验码（Low Density Parity Check Code，LDPC），这是LDPC仿真中稀疏矩阵生成程序，我花了好几天的时间搞懂，并做了注释。
-LDPC codes that low-density parity check codes (Low Density Parity Check Code, LDPC), which is generated sparse matrix LDPC simulation program, I spent a few
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用于LDPC编码译码的仿真实现。包括随机生成校验矩阵、由校验矩阵产生生成矩阵、编码、加随机噪声、译码等内容。-For LDPC codec simulation. Including randomly generated check matrix, generated by the parity check matrix generator matrix, coding, plus random noise, such as decoding.
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Matlab software that generates LDPC parity check matrix of rate 1/2 with the possibility of selecting the input output block dimension and performs BER evaluation of BPSK+LDPC transmission over AWGN channel.
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LDPC码校验矩阵的生成，可在c++上运行-Generating LDPC code check matrix, can be run on c++
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matlab生成LDPC的校验矩阵和生成矩阵-matlab generated LDPC parity check matrix and the generator matrix
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根据行重、列重，构造低密度奇偶校验码（LDPC码）的校验矩阵。-According to the line weight, the column weight is constructed LDPC (LDPC code) parity check matrix.
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本文基于 CCSDS 标准上的算法详细研究了校验矩阵的生成算法、快速编码算法、最小 和译码算法，通过仿真对掌握的情况进行验证。虽在文章中最后没有给出在硬件上实现的情 况，但是在硬件上实现时各模块的设计进行了较为详细的介绍，后续工作证明它是行之有效 的。(In this paper, based on the algorithm of CCSDS standard, the generation algorithm of parity check matrix, fast encoding alg
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LDPC信道编码仿真。generate_h.m生成校验矩阵H。用main_encode.m程序载入校验矩阵信息，用encode.m进行编码。(LDPC channel coding simulation. Generate_h.m generates parity check matrix H. Load the check matrix information with main_encode.m program and encode with encode.m.)
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1） 生成具有大小的LDPC奇偶校验矩阵。
2） 使用BF算法对使用1）生成的码字进行解码。
3） 给出解码算法在BPSK调制和AWGN信道下，信噪比为1、1.5、2、2.5、3db时的误码概率。(1)Generate a parity check matrix of LDPC with size .
2)Use the BF algorithm to decode a codeword generated by using 1).
3)Give the bit error probabilit
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