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arXiv 2212.04064cs.ITmath.IT
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面向列表译码的CRC辅助短分组高码率卷积码

CRC-Aided High-Rate Convolutional Codes With Short Blocklengths for List Decoding

Wenhui Sui, Brendan Towell, Ava Asmani, Hengjie Yang, Holden Grissett, Richard D. Wesel

AI总结:

本文针对短分组高码率卷积码设计最优CRC多项式,结合对偶网格等技术降低译码复杂度,验证了相关方案能紧密逼近RCU界,并对比了不同码型与译码器的复杂度-性能权衡。

摘要:

近期,码率为1/n的归零(ZT)与咬尾(TB)卷积码(CC)结合循环冗余校验(CRC)辅助的列表译码,已被证明在短分组场景下能紧密逼近随机编码联合(RCU)界。本文针对短分组、码率为(n-1)/n的ZT和TB卷积码,设计CRC多项式。本文同时考虑了标准的(n-1)/n码率卷积码多项式,以及通过对1/2码率码进行删余得到的(n-1)/n码率设计方案。CRC多项式的选取以最大化最小距离d_min、最小化最近邻数目A_(d_min)为目标。对于标准(n-1)/n码率码,采用Yamada等人提出的对偶网格,可降低CRC辅助串行列表维特比译码(SLVD)的复杂度。咬尾卷积码的CRC辅助SLVD在分组长度为128时,能紧密逼近RCU界。本文对比了CRC辅助的标准型与删余型归零卷积码、咬尾卷积码的误帧率(FER)性能(与RCU界的差距)及复杂度。本文还探究了三种咬尾卷积码译码器的复杂度-性能权衡:单网格方案、多网格方案,以及采用环绕维特比算法进行预处理的改进型单网格方案。

英文摘要:

Recently, rate-1/n zero-terminated (ZT) and tail-biting (TB) convolutional codes (CCs) with cyclic redundancy check (CRC)-aided list decoding have been shown to closely approach the random-coding union (RCU) bound for short blocklengths. This paper designs CRC polynomials for rate- (n-1)/n ZT and TB CCs with short blocklengths. This paper considers both standard rate-(n-1)/n CC polynomials and rate- (n-1)/n designs resulting from puncturing a rate-1/2 code. The CRC polynomials are chosen to maximize the minimum distance d_min and minimize the number of nearest neighbors A_(d_min) . For the standard rate-(n-1)/n codes, utilization of the dual trellis proposed by Yamada et al. lowers the complexity of CRC-aided serial list Viterbi decoding (SLVD). CRC-aided SLVD of the TBCCs closely approaches the RCU bound at a blocklength of 128. This paper compares the FER performance (gap to the RCU bound) and complexity of the CRC-aided standard and punctured ZTCCs and TBCCs. This paper also explores the complexity-performance trade-off for three TBCC decoders: a single-trellis approach, a multi-trellis approach, and a modified single-trellis approach with pre-processing using the wrap around Viterbi algorithm.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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