【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.更多还原

【Abstract】 According to the sparse characteristic of the PPM modulated signal,this paper proposes a coding method making use of a low density matrix,and decoding with maximum a posteriori probability rule.Compared with the regular LDPC,the proposed method has better error correction ability and decoding speed when using hard or soft decisions.更多还原