摘要
由Gallager最早提出的比特翻转算法是LDPC码中最主要的硬判决译码算法。目前,在该原始比特翻转算法基础之上又相继涌现出了许多改进型的加权比特翻转算法,这些算法通过引入不同的比特权重计算方式,进一步提高了此类算法寻找并定位错误比特的能力,从而有效地增加了硬判决算法的译码性能。在Jian Li等人提出的快速多比特翻转算法的基础上进一步优化了比特翻转准则,将其限定地应用在硬译码算法的第一次迭代译码过程中。仿真结果表明,该改进算法可以在误码率性能损失较小的情况下,降低译码迭代次数,从而节省整体译码过程的时间,减轻硬件的能耗负担,提升硬判决译码的效率。
Bit-Flipping Decoding algorithm proposed by Gallager is considered as one of the best hard-decision decoding algorithms for LDPC Codes.Recently many improved versions based on this algorithm emerge successively,which are capable of achieving relatively perfect balance between performance and complexity.On the basis of Jian Li＇s research on a faster Weighted Bit-Flipping Decoding algorithm,this paper presents a improved algorithm by adopting one optimized flipped criterion at the first iteration.Simulation results show that the proposed scheme provides a slightly inferior BER performance but significant computational reduction as compared to those of the existing algorithms.
出处
《电子测量技术》
2011年第3期25-28,共4页
Electronic Measurement Technology
关键词
低密度奇偶检验码
比特翻转
加权比特翻转
改进型加权比特翻转
比特翻转准则
low-density parity check（LDPC） codes
bits-flipping algorithm（BF）
weighted BF algorithm（WBF）
modified WBF algorithm（MWBF）
bits-flipping criterion
