Improved Belief Propagation Decoder for LDPC-CRC-Polar Codes with Bit-Freezing  

作　　者：Qasim Jan Yin Chao Pan Zhiwen Muhammad Furqan Zakir Ali You Xiaohu 

机构地区：[1]National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China [2]Purple Mountain Laboratories,Nanjing 211100,China [3]Department of Computer Science,National University of Computer and Emerging Sciences Peshawar Campus 25100,Pakistan [4]Department of Software Engineering,Capital University of Science and Technology(CUST),Islamabad 44000,Pakistan [5]Department of Computer Sciences,Bahria University Lahore Campus,Pakistan

出　　处：《China Communications》2024年第7期135-148,共14页中国通信（英文版）

基　　金：partially supported by the National Key Research and Development Project under Grant 2020YFB1806805。

摘　　要：Though belief propagation bit-flip(BPBF)decoding improves the error correction performance of polar codes,it uses the exhaustive flips method to achieve the error correction performance of CA-SCL decoding,thus resulting in high decoding complexity and latency.To alleviate this issue,we incorporate the LDPC-CRC-Polar coding scheme with BPBF and propose an improved belief propagation decoder for LDPC-CRC-Polar codes with bit-freezing(LDPCCRC-Polar codes BPBFz).The proposed LDPCCRC-Polar codes BPBFz employs the LDPC code to ensure the reliability of the flipping set,i.e.,critical set(CS),and dynamically update it.The modified CS is further utilized for the identification of error-prone bits.The proposed LDPC-CRC-Polar codes BPBFz obtains remarkable error correction performance and is comparable to that of the CA-SCL(L=16)decoder under medium-to-high signal-to-noise ratio(SNR)regions.It gains up to 1.2dB and 0.9dB at a fixed BLER=10-4compared with BP and BPBF(CS-1),respectively.In addition,the proposed LDPC-CRC-Polar codes BPBFz has lower decoding latency compared with CA-SCL and BPBF,i.e.,it is 15 times faster than CA-SCL(L=16)at high SNR regions.

关 键 词：belief propagation bit-flipping concatenated codes LDPC-CRC-Polar codes polar codes 

分 类 号：TN764[电子电信—电路与系统]