计算机工程2018，Vol.44Issue(1)：128-133,6.DOI:10.3969/j.issn.1000-3428.2018.01.021
可快速编码的大围长QC-LDPC码构造方法
Construction Method of QC-LDPC Codes with Big Girth for Fast Encoding
摘要
Abstract
The sub-matrices on both diagonals of the right half of the check matrix are unit matrices.Existence of the deterministic unit matrix not only destroys the randomness of Quasie Cyclic-Low Density Parity Check (QC-LDPC) code,it leads to a certain loss of performance.For this reason,a construction method of QC-LDPC codes with girth 8 and a fast encoding is proposed.An improved quasi-doubly-diagonal parity check matrix is obtained by using Independent Row-column Mapping Sequence(IRCMS) algorithm,row and column rotation shift and masking techniques,so that the constructed codes not only have a girth of at least 8,but also use check matrix to fast coding,they can effectively reduce the coding complexity.Simulation results show that compared with the rule-based codes constructed based on IRCMS algorithm,the constructed codes not only have fast coding characteristics,but also have a performance improvement of about 0.15 dB.Compared with the QC-LDPC codes constructed based on the Progress Edge Growth (PEG) algorithm,the constructed codes are similar in performance with low coding complexity.Compared with the improved DVB-S2 codes,the constructed codes have a coding gain of about 0.1 dB.关键词
低密度奇偶校验码/循环置换矩阵/围长/行列循环移位/快速编码Key words
Low Density Parity Check(LDPC) code/Circulant Permutation Matrix(CPM)/girth/row-column circular shift/fast encoding分类
信息技术与安全科学引用本文复制引用
彭海英,杨箭,孙力军..可快速编码的大围长QC-LDPC码构造方法[J].计算机工程,2018,44(1):128-133,6.基金项目
国家自然科学基金(61271261) （61271261）
重庆高校创新团队建设计划项目(CXTDX201601020). （CXTDX201601020）
