An Efficient Method of Constructing Quasi-Cyclic Low-Density Parity-Check Codes

被引：0
|
作者：
Wu, Zhanji [1 ]
Cheng, Jiao [1 ]
机构：
[1] Beijing Univ Posts & Telecommun, Sch Informat & Telecommun, Beijing 100876, Peoples R China
来源：
2012 IEEE VEHICULAR TECHNOLOGY CONFERENCE (VTC FALL) | 2012年
关键词：
low-density parity-check (LDPC) codes; quasi-cyclic (QC) LDPC; extrinsic information transfer (EXIT) chart; progressive edge growth (PEG) algorithm; LDPC CODES;
D O I：
暂无
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
An efficient method of constructing irregular quasi-cyclic (QC) low-density parity-check (LDPC) codes is proposed. In order to find the degree distribution with low convergence threshold, the extrinsic information transfer (EXIT) chart is utilized to optimize the degree distribution of LDPC codes. Then, a modified progressive edge growth (PEG) algorithm is used to get the mask matrix with the optimal degree distribution. Finally, the parity-check matrix of QC LDPC code is constructed based on the mask matrix, and the shift values are optimized to eliminate short cycles. Simulation results show that the constructed irregular QC LDPC codes with optimized degree distribution significantly outperform the regular QC LDPC codes in the additive white Gaussion noise (AWGN) channel.
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页数：5
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