不规则LDPC码构造方法研究及其改进

Study and improvement on construction methods of irregular LDPC code

通过对码的度数分布进行设计,非规则LDCP码能获得比规则LDPC码更好的性能,但非规则LDPC码在高SNR区会出现错误平层。在本文中,利用ACE算法,对非规则LDPC码的构造方法PEG算法进行改进,以降低非规则LDPC码的错误平层。最后Matlab模拟证明此算法有效提高了非规则LDPC码在加性高斯白噪声通道中的纠错性能。

Through designing degree distributions, irregular LDPC code have better error correcting performance than regular LDPC code. However, irregular LDPC code have error floor at high SNR region. This thesis improves PEG algorithm to make irregular LDPC have lower error floor by ACE algorithm. At last, through Matlab simulations, we confirm that this algorithm improves the error correction performance of irregular LDPC code oefformance over the additive white Gaussian noise channel.