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中文摘要：
针对PPM调制信号的脉冲数具有稀疏性的特点，本文提出了一种利用低密度矩阵编码的方法，并根据最大后验概率准则进行译码．仿真结果表明，不管采用硬判决还是软判决，提出的编码方法都具有比规则LDPC码更好的纠错能力和更快的译码速度．
英文摘要：
According to the sparse characteristic of the PPM modulated signal,this paper proposes a coding method making use of a low density malrix, and decoding with maximum a posteriori probability rule. Compared with the regular LDPC, the pro posed method has better error correction ability and decoding speed when using hard or soft decisions.
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