Soft-decision decoding of BCH code in the global navigation satellite system( GNSS) is investigated in order to improve the performance of traditional hard-decision decoding. Using the nice structural properties of BC...Soft-decision decoding of BCH code in the global navigation satellite system( GNSS) is investigated in order to improve the performance of traditional hard-decision decoding. Using the nice structural properties of BCH code,a soft-decision decoding scheme is proposed. It is theoretically shown that the proposed scheme exactly performs maximum-likelihood( ML) decoding,which means the decoding performance is optimal. Moreover,an efficient implementation method of the proposed scheme is designed based on Viterbi algorithm. Simulation results show that the performance of the proposed soft-decision ML decoding scheme is significantly improved compared with the traditional hard-decision decoding method at the expense of moderate complexity increase.展开更多
本文面向高可靠低时延通信(High-Reliability and Low-Latency Communication,HRLLC)场景的实际需求,提出了一种基于BCH(Bose,Chaudhuri and Hocquenghem,BCH)码的双向叠加编码与低复杂度译码方案.编码方面,采用BCH码作为成分码,基于双...本文面向高可靠低时延通信(High-Reliability and Low-Latency Communication,HRLLC)场景的实际需求,提出了一种基于BCH(Bose,Chaudhuri and Hocquenghem,BCH)码的双向叠加编码与低复杂度译码方案.编码方面,采用BCH码作为成分码,基于双向叠加编码传输(Twisted-Pair Superposition Transmission,TPST)框架,构造了双向叠加BCH(TPST-BCH)码:上层BCH码字经随机变换后叠加至下层BCH码字,叠加版本进一步交织并反馈叠加至上层BCH码字,实现码长扩展与可靠性提升.译码方面,基于串行干扰消除思想,结合局部约束顺序统计译码(Ordered Statistics Decoding with Local Constraints,LC-OSD),先对上层码字生成一系列候选,给定上层候选后对下层码字进行LC-OSD译码,并最终选取后验概率最大的候选作为译码输出.为降低复杂度,我们提出了针对译码的提前终止设计,包括层内提前终止(用于提前终止层内LC-OSD搜索)和跨层提前终止(用于跳过某个上层码字给定后的整个下层LC-OSD搜索).结果显示,所提终止设计可以极大降低搜索次数,且几乎不损失性能.与现有编码方案相比,所提TPST-BCH码(采用所提译码)误帧率优于同码长码率的BCH码(采用LC-OSD算法)、5G LDPC(Low Density Parity Check)码(采用置信传播译码),与5G Polar码(采用串行干扰消除列表译码)误帧率相当或稍优,但在中高信噪比区域相对于5G Polar码具有更低的译码操作数和译码时延.展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No.61271423)
文摘Soft-decision decoding of BCH code in the global navigation satellite system( GNSS) is investigated in order to improve the performance of traditional hard-decision decoding. Using the nice structural properties of BCH code,a soft-decision decoding scheme is proposed. It is theoretically shown that the proposed scheme exactly performs maximum-likelihood( ML) decoding,which means the decoding performance is optimal. Moreover,an efficient implementation method of the proposed scheme is designed based on Viterbi algorithm. Simulation results show that the performance of the proposed soft-decision ML decoding scheme is significantly improved compared with the traditional hard-decision decoding method at the expense of moderate complexity increase.
文摘本文面向高可靠低时延通信(High-Reliability and Low-Latency Communication,HRLLC)场景的实际需求,提出了一种基于BCH(Bose,Chaudhuri and Hocquenghem,BCH)码的双向叠加编码与低复杂度译码方案.编码方面,采用BCH码作为成分码,基于双向叠加编码传输(Twisted-Pair Superposition Transmission,TPST)框架,构造了双向叠加BCH(TPST-BCH)码:上层BCH码字经随机变换后叠加至下层BCH码字,叠加版本进一步交织并反馈叠加至上层BCH码字,实现码长扩展与可靠性提升.译码方面,基于串行干扰消除思想,结合局部约束顺序统计译码(Ordered Statistics Decoding with Local Constraints,LC-OSD),先对上层码字生成一系列候选,给定上层候选后对下层码字进行LC-OSD译码,并最终选取后验概率最大的候选作为译码输出.为降低复杂度,我们提出了针对译码的提前终止设计,包括层内提前终止(用于提前终止层内LC-OSD搜索)和跨层提前终止(用于跳过某个上层码字给定后的整个下层LC-OSD搜索).结果显示,所提终止设计可以极大降低搜索次数,且几乎不损失性能.与现有编码方案相比,所提TPST-BCH码(采用所提译码)误帧率优于同码长码率的BCH码(采用LC-OSD算法)、5G LDPC(Low Density Parity Check)码(采用置信传播译码),与5G Polar码(采用串行干扰消除列表译码)误帧率相当或稍优,但在中高信噪比区域相对于5G Polar码具有更低的译码操作数和译码时延.
