基于振荡迭代的修正BP译码算法  

A Modified belief propagation decoding algorithm for low-density parity-check codes based on oscillating iteration

作　　者：彭世章[1] 赵泽茂[1] 包建荣[1] 

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310018

出　　处：《电路与系统学报》2012年第2期100-105,共6页Journal of Circuits and Systems

基　　金：国家自然科学基金委员会与中国工程物理研究院联合基金项目(10776007);国家自然科学基金(61001133)

摘　　要：针对中高信噪比(SNR)下低密度奇偶校验(LDPC)译码错误振荡迭代不收敛,提出了基于置信传播(BP)算法的修正LDPC译码算法,即软值归零BP算法。该算法通过将振荡迭代的变量节点传递的外信息置零,减少错误信道消息对迭代译码的影响,较大地改善了译码性能。而且,还给出了振荡迭代节点的判定准则,提高了振荡迭代节点判定的准确性。仿真结果表明,在中高信噪比区且译码迭代次数相同的情况下,该算法能比BP算法获得更好的译码性能。According to no-convergence of falsely oscillating iteration in the low-density parity-check （LDPC） decoding at the range from medium to high SNRs（Signal to Noise Ratios）, we propose a modified LDPC belief propagation（BP） decoding algorithm, i.e. soft value zero-forcing BP algorithm. By setting extrinsic information of the oscillating iteration bit nodes into zero, the impact on the iteratively decoding from false channel information is greatly reduced. And it also improves the performance of the decoding algorithm. Furthermore, a decision criterion of oscillating iteration nodes is presented to increase the accuracy of the decision. Simulation results show that the proposed algorithm has better decoding performance than that of the BP algorithm with the same iterations at medium and high SNRs.

关 键 词：低密度奇偶校验码 软值归零 判定准则 振荡 

分 类 号：TN911.22[电子电信—通信与信息系统]