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针对浅海水声信道的长时延、强多途特性以及中短长LDPC码BP译码算法在迭代过程中因出现振荡现象而严重影响译码算法的性能,提出了一种新的优化BP译码算法。新的优化BP译码算法将节点所在最小环长和变量节点信息相结合作为判决标准,并借鉴“纠删”译码算法的思想,通过对震荡值进行修正来减弱和抑制中短长LDPC码在译码迭代过程中出现的震荡现象。仿真结果表明:在浅海水声信道中,采用优化的BP译码算法能获得比文中其他BP译码算法更好的译码性能。
Aiming at the problem of long time delay, strong multi-path characteristics and short and long LDPC BP decoding algorithm in shallow-sea acoustic channel, the performance of decoding algorithm is seriously affected by the oscillation during the iterative process. A new optimized BP translation Code algorithm. The new optimized BP decoding algorithm combines the minimum ring length of the node and the node information of the variable as the criterion and draws lessons from the idea of “erasure” decoding algorithm to weaken and restrain short and long Oscillation phenomenon of LDPC code during decoding iteration. The simulation results show that the optimized BP decoding algorithm can obtain better decoding performance than other BP decoding algorithms in the shallow sea acoustic channel.