Title :
Improved ADMM Penalized Decoder for Irregular Low-Density Parity-Check Codes
Author :
Xiaopeng Jiao ; Haoyuan Wei ; Jianjun Mu ; Chao Chen
Author_Institution :
Sch. of Comput. Sci. & Technol., Xidian Univ., Xi´an, China
Abstract :
Based on linear programming (LP) decoding with alternating direction method of multipliers (ADMM), Liu et al. proposed an ADMM penalized decoder for low-density parity-check (LDPC) codes that can improve the error rate performance at low signal-to-noise ratios. In this letter, we propose a new ADMM penalized decoder to improve the error rate performance further for irregular LDPC codes. The proposed decoder modifies the penalty term of the objective function by assigning different penalty parameters for different variable node degrees. Simulations over three irregular LDPC codes show that the proposed decoder performs considerably better than the ADMM penalized decoder.
Keywords :
decoding; error statistics; linear programming; parity check codes; ADMM penalized decoder; LP decoding; alternating direction method of multipliers; error rate performance; irregular LDPC codes; linear programming decoding; low-density parity-check codes; penalty parameters; penalty term; variable node degrees; Decoding; Error analysis; Indexes; Linear programming; Optimization; Parity check codes; Signal to noise ratio; Alternating direction method of multipliers (ADMM); alternating direction method of multipliers (ADMM); linear programming (LP) decoding; penalized ADMM decoder;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2015.2421445