Design of improved error-rate sliding window decoder for SC-LDPC codes: reliable termination and channel value reuse  

作　　者：JIA Xishan LI Jining YAO Yuan WANG Yifan LIU Bo XU Degang 

机构地区：[1]School of Precision Instruments and Opto-electronics Engineering,Tianjin University,Tianjin 300072,China [2]Key Laboratory of Optoelectronics Information Technology(Ministry of Education),Tianjin University,Tianjin 300072,China [3]Institute of Modern Optics,College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China [4]Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,Tianjin 300350,China

出　　处：《Optoelectronics Letters》2025年第4期212-217,共6页光电子快报(英文版)

基　　金：supported by the National Natural Science Foundation of China (No.62275193)。

摘　　要：In this paper,an improved error-rate sliding window decoder is proposed for spatially coupled low-density parity-check(SC-LDPC)codes.For the conventional sliding window decoder,the message retention mechanism causes unreliable messages along the edges of belief propagation(BP)decoding in the current window to be kept for subsequent window decoding.To improve the reliability of the retained messages during the window transition,a reliable termination method is embedded,where the retained messages undergo more reliable parity checks.Additionally,decoding failure is unavoidable and even causes error propagation when the number of errors exceeds the error-correcting capability of the window.To mitigate this problem,a channel value reuse mechanism is designed,where the received channel values are utilized to reinitialize the window.Furthermore,considering the complexity and performance of decoding,a feasible sliding optimized window decoding(SOWD)scheme is introduced.Finally,simulation results confirm the superior performance of the proposed SOWD scheme in both the waterfall and error floor regions.This work has great potential in the applications of wireless optical communication and fiber optic communication.

关 键 词：reliable termination message retention mechanism reliable termination method sliding window decoderthe error rate sliding window decoder belief propagation bp decoding retained messages 

分 类 号：TN911.22[电子电信—通信与信息系统] TN911.2[电子电信—信息与通信工程]