By analyzing the discretized density evolution theory and the differential evolution algorithm, a method is proposed to search optimal irregular LDPC code for joint optimization of the system.

在分析和阐述了离散概率密度演化理论和多维线性空间极值问题的基础上，给出了适合于该方案的非正则ldpc码的搜索算法和搜索结果。

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In Chinese national standard for Digital Terrestrial Multimedia Broadcasting (DTMB), irregular Quasi Cyclic LDPC (QC - LDPC) code is used as core part of forward error correction coding.

在中国数字电视广播地面传输标准(DTMB)中，使用了非规则准循环ld P C码(QC - LDPC)作为前向纠错编码的核心部分。

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