基于改进分段CRC码校验模式的极化码EPre-Fast-SCL译码算法  

The EPreFast-SCL decoding algorithm of polar codes based on the improved segmented CRC check mode

作　　者：袁建国[1] 翟少秋 贺京杰 张丰果 YUAN Jianguo;ZHAI Shaoqiu;HE Jingjie;ZHANG Fengguo(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《光电子.激光》2025年第1期87-92,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金项目(61971079)资助项目。

摘　　要：针对极化码预快速串行抵消列表(prefast successive cancellation list,PreFast-SCL)译码算法没有设置早期停止策略导致复杂度较高的问题,提出一种改进的分段循环冗余校验(cyclic redundancy check,CRC)码校验模式,进而结合该改进的校验模式提出一种增强的PreFast-SCL(enhanced PreFast-SCL,EPreFast-SCL)译码算法。该算法在编码时将信息序列进行分段并在每段信息序列尾部加入可以校验该段信息序列的CRC码,最后一段CRC码用来校验整个信息序列,当其中的某段信息序列未通过校验时,及时终止并剔除错误路径。仿真结果表明,所提出的EPreFast-SCL译码算法相对于循环冗余校验码辅助SCL(CRC aided SCL,CA-SCL)译码算法以及PreFast-SCL译码算法在一定程度上提升了译码性能且具有较低的译码复杂度。In order to solve the problem of the high complexity caused by the lack of the early stop strategy in the prefast successive cancellation list(PreFast-SCL)decoding algorithm of polar codes,an improved verification mode of the segmented cyclic redundancy check(CRC)code is proposed,and then combined with the improved verification mode,an enhanced PreFast-SCL(EPreFast-SCL)decoding algorithm is proposed.The proposed algorithm segments the information sequence during encoding and adds the CRC code that can verify the information sequence at the end of each information sequence.In addition,the last CRC code is used to verify the entire information sequence.when a certain segment of the information sequence fails to pass the verification,it is promptly terminated and the error path is eliminated.The simulation results indicate that the proposed EPreFast-SCL decoding algorithm enhances the decoding performance to some extent compared to the cyclic redundancy check aided SCL(CRC-aided SCL,CA-SCL)decoding algorithm and the PreFast-SCL decoding algorithm,with lower decoding complexity.

关 键 词：极化码 预快速 串行抵消列表 分段循环冗余校验 

分 类 号：TN911.22[电子电信—通信与信息系统]