不规则LDPC码度分布的优化设计研究

针对非规则LDPC码的度分布优化,研究了差分进化算法,并利用差分进化算法得到了最大门限的度分布序列,同时在AWGN信道下,通过高斯近似方法得到了在该度分布对下的较精确的LDPC译码门限。通过仿真发现,在改进后的优化算法中的度分布对得到了更高的门限值。同时高斯近似还能应用到其他高效纠错码,对现代高效纠错码具有重要的指导意义。

The Optimization Design of Degree Distributions for Irregular LDPC Codes

For the optimization of degree distributions for irregular LDPC codes, the paper introduces the differential evolution encoding algorithm from which the biggest threshold degree distribution sequence can be derived. And at the same time, the precise LDPC decoder threshold can be worked out through the Gaussian approximation method in AWGN channel. Through simulation ,what can be found is that the improved optimization algorithm of degree distribution can provide higher threshold. Moreover, the Gaussian approximation method can also be used in other efficient ECC. So this paper has important guiding significance to the efficient ECC.