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This LDPC software is intended as an introduction to LDPC codes computer based simulation. The pseudo-random irregular low density parity check matrix is based on Radford M. Neal’s programs collection, which can be found in [1]. While Neal’s collecti
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This LDPC software is intended as an introduction to LDPC codes computer based simulation. The pseudo-random irregular low density parity check matrix is based on Radford M. Neal’s programs collection, which can be found in [1]. While Neal’s collecti
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LDPC码既低密度奇偶校验码（Low Density Parity Check Code，LDPC），它由Robert G.Gallager博士于1963年提出的一类具有稀疏校验矩阵的线性分组码，不仅有逼近Shannon限的良好性能，而且译码复杂度较低, 结构灵活，是近年信道编码领域的研究热点，目前已广泛应用于深空通信、光纤通信、卫星数字视频和音频广播等领域。LDPC码已成为第四代通信系统(4G)
-LDPC codes BER simulation under AWGN channel.
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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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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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how to construct the parity check matrix for LDPC codes
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from Shortten DVB-S2 LDPC 64800 code into 8100
The program can produce the parity check matrix of DVB-S2 LDPC 64800 with short length code of 8100.
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对低密度校验矩阵的重建算法，LDPC应用在压缩感知中的一种算法-Low density parity check matrix of the reconstruction algorithm of LDPC applications in compression of the perception of an algorithm
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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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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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文件中给出了可用的LDPC编码，译码程序。并且有生成生成矩阵与校验矩阵的程序。-File give the available LDPC encoding, decoding process. And there is a generator matrix and parity check matrix generation program.
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两种不同的方法构造低密度校验编码的校验矩阵，两种方法的复杂度有所不同，适合编码研究的学子们-Two different coding method for constructing low-density parity check matrix, the complexity of the two methods differ for students who study coding
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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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LDPC码的C语言编译码，包含校验矩阵，备注-LDPC codes codec C language, including parity check matrix, notes, etc.
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ldpc码校验矩阵的生成函数，测试可以使用的文件-Lala code file generation function ldpc parity check matrix, the test may be used
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This soft decoding algorithm for the sumproduct implementation of the ldpc codoes. The program calculates the log likelihood ratio.
And add them all in the . After running the programme type Eji to fing the final matrix of lg likelyhood ratios.H=L
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constant ldpc parity check matrix
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