一种提升最小距离的CRC-Polar码设计方法  

Method for designing CRC-Polar codes to improve minimum distances

作　　者：宋嘉伟 郑惠娟 童胜[1] SONG Jiawei;ZHENG Huijuan;TONG Sheng(State Key Laboratory of Integrated Service Networks,Xidian University,Xi’an 710071,China;School of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi’an 710121,China)

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071 [2]西安邮电大学电子工程学院,陕西西安710121

出　　处：《西安电子科技大学学报》2020年第6期72-77,共6页Journal of Xidian University

基　　金：国家自然科学基金(61871029);中央高校基本科研业务项目(JB190122)。

摘　　要：鉴于级联CRC-Polar码在短码长时的优异纠错性能,5G标准已经采纳级联CRC-Polar码作为eMBB场景下控制信道的信道编码方案。为了提升级联CRC-Polar码的最小汉明距离,改善其在高信噪比时的纠错性能,同时考虑了循环冗余校验码的优化设计和极化码信息位选择对级联编码最小距离的影响,提出了一种新的级联CRC-Polar码设计方案。采用所提方案设计的CRC-Polar码在相同参数下能够减少最小重量码字数目,甚至在某些参数下能够提升级联CRC-Polar码的最小距离。仿真结果验证了所提设计方法的有效性。In view of the excellent error correction performance of short concatenated CRC-Polar codes,the 5G standard has adopted concatenated CRC-Polar codes as the channel coding scheme for control channels in the eMBB scenario.This paper examines the optimal design of concatenated CRC-Polar codes,and aims to increase the minimum distance of concatenated CRC-Polar codes in order to improve their error correction performance at the high SNR region.To this end,this paper considers both the optimal design of the CRC code and the selection of information bit positions on the minimum distance behaviors of concatenated codes,and proposes a new design method for concatenated CRC-Polar codes.The proposed scheme can effectively reduce the number of codewords with a minimum Hamming weight,and even can increase the minimum distances of concatenated CRC-Polar codes for some code parameters.Simulation results verify the effectiveness of the proposed design method.

关 键 词：极化码 循环冗余校验 最小距离 

分 类 号：TN911.22[电子电信—通信与信息系统]