LDPC-CRC-极化码级联码及其比特翻转译码算法  

Concatenated LDPC-CRC-Polar Codes and Corresponding Bit-flipping Decoding Algorithm

作　　者：尹超 潘志文[1,2] 刘楠 尤肖虎[1,2] YIN Chao;PAN Zhiwen;LIU Nan;YOU Xiaohu(National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China;Purple Mountain Laboratories,Nanjing 211100,China)

机构地区：[1]东南大学移动通信国家重点实验室,江苏南京210096 [2]网络通信与安全紫金山实验室,江苏南京211100

出　　处：《无线电通信技术》2021年第1期73-79,共7页Radio Communications Technology

基　　金：国家重点研发计划项目(2018YFB1802402)。

摘　　要：级联的LDPC-极化码被用于提升有限长度下极化码的译码性能,尽管在置信传播译码器下获得很大的性能提升,仍与最先进的CA-SCL译码器有着明显的性能差距。针对该问题,提出一个改进的LDPC-极化码级联码比特翻转译码算法,在传统的联合因子图置信传播译码算法译码失败后,通过每次对一个易错的信息比特进行比特翻转,在给定的翻转次数下,其BLER性能比BP译码算法有0.3 dB的增益;在原有的LDPC-极化码基础上串联CRC后,性能得到了进一步提升。仿真结果表明,该级联码在中高信噪比区间获得了极为优异的译码性能,接近中等列表长度的CA-SCL译码器。同时,相对于CA-SCL译码器和极化码的置信传播比特翻转译码器,具有更低的译码时延。Concatenated LPDC-Polar codes are used to improve the performance of finite-length polar codes.Though achieving greater improvement under belief propagation decoder,it still has a huge gap on CA-SCL decoder.In this paper,we propose an im⁃proved belief propagation decoding of LDPC-Polar codes with bit-flipping.By flipping one bit of unstable information bits at a time,its performance has 0.3 dB gain than traditional BP decoder under given flipping attempts.Concatenated with cyclic redundancy check nodes,the concatenated codes get advanced improvements.Simulation results show that these concatenated codes have extraordinary block error rate performance,which are competitive to medium list length CA-SCL decoder in medium and high SNR region.Besides,they also have much lower latency than CA-SCL decoder and BPF decoder.

关 键 词：极化码 级联码 比特翻转 置信传播 

分 类 号：TN911.22[电子电信—通信与信息系统]