极化码混合自动请求重传技术综述  

A Survey of Polar-Coded Hybrid Automatic Repeat Request

作　　者：王炜 戴金晟 牛凯[1] 许进[2] WANG Wei;DAI Jincheng;NIU Kai;XU Jin(The Key Laboratory of Universal Wireless Communications,Ministry of Education,Beijing University of Posts and Telecommunications(BUPT),Beijing 100876,China;ZTE Corporation,Shenzhen 518055,China)

机构地区：[1]北京邮电大学“泛网无线通信”教育部重点实验室,北京100876 [2]中兴通讯股份有限公司,广东深圳518055

出　　处：《无线电通信技术》2020年第1期55-62,共8页Radio Communications Technology

基　　金：国家重点研发计划项目(2018YFE0205501);国家自然科学基金项目(61671080);中国博士后科学基金资助项目;中兴产学研论坛项目资助~~

摘　　要：极化码在有限码长下具有优异的性能,被3GPP采纳为5G控制信道编码方案。Beyond 5G(B5G)及6G对通信系统的可靠性和频谱效率有着更高的要求,需要解决逼近信道容量极限,提高系统性能的问题。为应对这一挑战,需要以极化码为基础,研究面向数据信道的极化编码传输技术。面对B5G及6G对通信系统的更高要求,总结了极化编码的链路自适应技术框架,介绍了几种典型的极化编码混合自动请求重传(Polar-Coded HARQ)技术方案。从性能、吞吐率、灵活性和复杂度等角度,对各种方案的优势与不足进行了综合对比。相较于传统HARQ方案,这些基于极化编码的新型HARQ方案能够显著提高无线传输性能,满足6G移动通信系统需求。归纳总结了极化编码HARQ的关键技术及未来研究方向,旨在为进一步研究提供有益的参考。Polar codes have excellent performance under finite-length and have been adopted as the coding scheme for 5G control channels by 3GPP.B5G(Beyond 5G)and 6G have higher requirements for the reliability and spectral efficiency of the communication system.It is necessary to solve the problem of approaching the channel capacity limit and improving the system performance.In order to meet this challenge,it is necessary to study polar-coded transmission technology for data channel based on polar codes.Facing higher requirements of B5G(beyond 5G)and 6G for communication system,the framework of link adaptive technology based on polar codes is summarized,and several typical polar-coded hybrid automatic repeat request(HARQ)technology schemes are introduced.In this paper,the advantages and disadvantages of various schemes are compared comprehensively from the aspects of performance,throughput,flexibility and complexity.Compared with traditional HARQ schemes,these new HARQ schemes based on polar codes can significantly improve the wireless transmission performance and meet the requirements of 6G mobile communication system.Finally,the key technologies and future research directions of polar coded HARQ are summarized.It is intended to provide a useful reference for further research.

关 键 词：6G 极化码 混合自动请求重传 速率适配 信道容量 

分 类 号：TN911.2[电子电信—通信与信息系统]