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Deterministic Girth-Eight QC-LDPC Codes with Large Column Weight

机译:大列重的确定性周长QC-LDPC码

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摘要

For any row weight L, several novel classes of (J = 5, L) and (J = 6, L) quasi-cyclic LDPC codes are deterministically constructed with girth eight. From these results, it is proved that (5, L) QC-LDPC codes with girth eight exist for any circulant permutation matrix (CPM) size P Ȧ5; (2L + 3)(L - 1) + 1, and that girth-eight (6, L) QC-LDPC codes exist for any P Ȧ5; 2(L+5)(L-1)+1. The two novel bounds remarkably improve the existing bounds of L^2(L-1) + 1 and (L^2+1)(L-1)+1, respectively. Moreover, for any column weight J and any row weight L, a construction for (J,L) QC-LDPC codes with girth eight is also proposed. This is the first deterministic and systematic construction which can generate girth-eight QC-LDPC codes with J Ȧ5; 7.
机译:对于任何行权重L,确定性地构造了几个新类别的(J = 5,L)和(J = 6,L)准周线LDPC码,围长为8。从这些结果证明,对于任何循环置换矩阵(CPM)大小PȦ5,都存在(5,L)个八围的QC-LDPC码; (2L + 3)(L-1)+1,并且对于任何PȦ5,都存在八角(6,L)QC-LDPC码; 2(L + 5)(L-1)+1。这两个新颖的边界分别显着改善了L ^ 2(L-1)+1和(L ^ 2 + 1)(L-1)+1的现有边界。而且,对于任何列权重J和任何行权重L,还提出了具有八围的(J,L)QC-LDPC码的构造。这是第一个确定性和系统性的结构,可以生成JȦ5的周长QC-LDPC码。 7。

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