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Alternative TitleA Class of Quasi-cyclic LDPC Codes and Encoding
夏国江; 齐建中; 孙辉先; 熊蔚明; 北京8701信箱
Source Publication空间科学学报
Keyword准循环ldpc码 计算复杂度 结构复杂度 循环矩阵 生成向量
Other AbstractFirstly, based on the characters of space communication, this study improves a class of regular quasi-cyclic LDPC codes which is based on circulant matrices and obtains a kind of irregular quasi-cyclic LDPC codes. Compared with original codes, the parity check matrix called H of this irregular LDPC ensemble has three characters: 1.H is row full rank;2.H is lower triangulation;3.H contains degree one variable nodes. With the first two characters, the encoding complexity of computation and architecture of this kind of LDPC are proportion to the length of check symbols, so encoders implemented with software and hardware are quite simple. This feature is very important to deep space communication because the resource on board is constrained.The third character makes the iterative decoding threshold lower than the original codes. Moreover, the computer sim-ulation has proved this result.Secondly, the proof for the condition of girth not shorter than 6 is simplifed compared to the original ones. Last, the computing formula is derived for parity check symbols of systemic codes. Based on this formula, the encoding circuit has been investigated using shift registers.
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
夏国江,齐建中,孙辉先,等. 一类准循环LDPC码及其编码[J]. 空间科学学报,2009,29(4):443-447.
APA 夏国江,齐建中,孙辉先,熊蔚明,&北京8701信箱.(2009).一类准循环LDPC码及其编码.空间科学学报,29(4),443-447.
MLA 夏国江,et al."一类准循环LDPC码及其编码".空间科学学报 29.4(2009):443-447.
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