现代电子技术2018，Vol.41Issue(11)：1-4,4.DOI:10.16652/j.issn.1004-373x.2018.11.001
可快速编码的大围长QC-LDPC码构造
Construction of quasi-cyclic LDPC codes with fast encoding and large girth
摘要
Abstract
A construction method of quasi-cyclic(QC)LDPC codes with fast encoding and large girth is proposed to reduce the effect of short cycles on the performance of iterative decoding while maintaining the low encoding complexity of LDPC codes. The check matrix is divided into two parts. The right part of the matrix has the quasi-dual-diagonal structure,which can perform the fast encoding directly,and reduce the encoding complexity of LDPC codes effectively. The circulant permutation sub-matri-ces are set one by one in the left part of the matrix to ensure the minimum number of short cycles,avoid the occurrence of short cycles,and guarantee the characteristic of large girth. The simulation results show that,in comparison with LDPC codes in IEEE 802.16e,the codes constructed with the new method have larger girth and less short cycles,and better error correction performance while maintaining the low encoding complexity.关键词
LDPC码/准循环/循环置换矩阵/快速编码/校验矩阵/编码复杂度Key words
LDPC code/quasi-cycle/circulant permutation matrix/fast encoding/check matrix/encoding complexity分类
信息技术与安全科学引用本文复制引用
刘原华,何华..可快速编码的大围长QC-LDPC码构造[J].现代电子技术,2018,41(11):1-4,4.基金项目
陕西省自然科学基金资助项目(2016JQ6033) （2016JQ6033）
国家自然科学基金资助项目(61201194) （61201194）
国家自然科学基金资助项目(61601362)Project Supported by Natural Science Foundation of Shaanxi Province(2016JQ6033),National Natural Science Foundation of China(61201194,61601362) （61601362）
