基于5G LDPC码的增强耦合编码及HARQ设计  

An Enhanced 5G LDPC Coupling Coding and HARQ Design

作　　者：杨佳仪 王千帆[1] 毕胜 谭志远 韦宝典 马啸[1] YANG Jiayi;WANG Qianfan;BI Sheng;TAN Zhiyuan;WEI Baodian;MA Xiao(School of Computer and Engineering,Guang Dong Province Key Laboratory of Information Security Technology,MoE Key Laboratory of Information Technology,Sun Yat-sen University,Guangzhou 510006,China;School of Electric Power Engineering,South China University of Technology,Guangzhou 510641,China;Guangdong Power Grid Co.,Ltd.Guangzhou Power Supply Bureau,Guangzhou 510620,China;Huawei Technologies Co.,Ltd.,Shanghai 201206,China)

机构地区：[1]中山大学计算机学院,广东省信息安全技术重点实验室,信息技术教育部重点实验室,广东广州510006 [2]华南理工大学电力学院,广东广州510641 [3]广东电网有限责任公司广州供电局,广东广州510620 [4]上海华为技术有限公司,上海201206

出　　处：《移动通信》2025年第2期58-64,共7页Mobile Communications

基　　金：国家重点研发计划“面向未来无线通信信息处理若干关键问题的数学理论和方法”(2021YFA1000500);国家自然科学基金“面向6G的中短码理论与技术”(62471506);国家自然科学基金“面向下一代光纤通信网络的耦合LDPC码理论、设计和优化”(62301617);广东省自然科学基金“向下兼容的高可靠高吞吐耦合LDPC码传输方案设计与分析”(2023A1515011056)。

摘　　要：针对CB级反馈场景,提出了一种基于现有的5G标准低密度一致校验码的增强耦合编码与混合自动重传方案,旨在提升5G链路数据传输的可靠性并改善其吞吐性能。具体而言,在FEC设计方面,基于5G LDPC码引入分组马尔可夫叠加传输技术,设计了BMST-5G-LDPC码,通过部分叠加耦合机制有效提升了传输可靠性;在HARQ设计方面,基于BMST-5G-LDPC码提出了一种兼容型HARQ方案,支持增量冗余IR和重复冗余RR机制。为进一步改善吞吐性能,特别提出了部分重传HARQ方案,通过对错误CB的部分比特进行重组并重传,节省信道传输资源改善吞吐性能,并同样支持IR和RR部分重传设计。仿真结果表明,所设计的BMST-5G-LDPC码在准静态衰落信道下相比传统5G LDPC码有约1.25 dB的性能增益;对于HARQ设计,兼容型HARQ设计相比于传统IR-HARQ方案,有10%以上吞吐增益;特别地,采用IR机制的PR-HARQ相比于传统IR-HARQ方案在中高噪比有20%以上的吞吐增益。For code block(CB)-level feedback scenarios,an enhanced coupling coding and hybrid automatic repeat request(HARQ)scheme is proposed based on the standard 5G low-density parity-check(LDPC)codes to improve the reliability and throughput of 5G data link.Specifically,for the forward error correction(FEC)design,the block Markov superposition transmission(BMST)scheme is introduced based on 5G LDPC codes,resulting in the BMST-5G-LDPC codes,and the transmission reliability is effectively improved through the partial superposition coupling mechanism.For the HARQ design,a compatible HARQ scheme is proposed based on BMST-5G-LDPC codes,supporting both incremental redundancy(IR)and repetition redundancy(RR)mechanisms.To further improve the throughput,a partial retransmission HARQ(PR-HARQ)scheme is particularly proposed,where partial bits of the erroneous CBs are reorganized and retransmitted to save the transmission resources while maintaining compatibility with IR and RR designs.Simulation results show that the designed BMST-5G-LDPC codes achieve about 1.25 dB performance gains compared with the 5G LDPC codes over the quasi-static fading channel.For the HARQ design,the compatible HARQ scheme can achieve a throughput gain of 10%compared with the conventional IR-HARQ.In particular,the PR-IR-HARQ scheme can achieve a throughput gain of more than 20%compared with the conventional IR-HARQ with the medium and high signal-to-noise ratios.

关 键 词：5G 低密度一致校验码 混合自动重传 分组马尔可夫叠加传输 

分 类 号：TN911.22[电子电信—通信与信息系统]