Lowering the Error Floor of ADMM Penalized Decoder for LDPC Codes  

作　　者：Jiao Xiaopeng Mu Jianjun 

机构地区：[1]School of Computer Science and Technology, Xidian University, Xi'an 710071, Shaanxi Province, China [2]Key Laboratory of Information Coding and Transmission, Southwest Jiaotong University, Chengdu, 610031, China

出　　处：《China Communications》2016年第8期127-135,共9页中国通信（英文版）

基　　金：supported in part by National Nature Science Foundation of China under Grant No.61471286,No.61271004;the Fundamental Research Funds for the Central Universities;the open research fund of Key Laboratory of Information Coding and Transmission,Southwest Jiaotong University(No.2010-03)

摘　　要：Decoding by alternating direction method of multipliers(ADMM) is a promising linear programming decoder for low-density parity-check(LDPC) codes. In this paper, we propose a two-step scheme to lower the error floor of LDPC codes with ADMM penalized decoder.For the undetected errors that cannot be avoided at the decoder side, we modify the code structure slightly to eliminate low-weight code words. For the detected errors induced by small error-prone structures, we propose a post-processing method for the ADMM penalized decoder. Simulation results show that the error floor can be reduced significantly over three illustrated LDPC codes by the proposed two-step scheme.Decoding by alternating direction method of multipliers （ADMM） is a promising linear programming decoder for low-density par- ity-check （LDPC） codes. In this paper, we pro- pose a two-step scheme to lower the error floor of LDPC codes with ADMM penalized decoder. For the undetected errors that cannot be avoided at the decoder side, we modify the code structure slightly to eliminate low-weight code words. For the detected errors induced by small error-prone structures, we propose a post-processing method for the ADMM penalized decoder. Simulation results show that the error floor can be reduced significantly over three illustrated LDPC codes by the proposed two-step scheme.

关 键 词：LDPC codes linear programming decoding alternating direction method of multipliers(ADMM) error floor 

分 类 号：TN[电子电信]