On the Girth of (3,L) Quasi-Cyclic LDPC Codes based on Complete Protographs

被引：0
|
作者：
Ranganathan, Sudarsan V. S. [1 ]
Divsalar, Dariush [2 ]
Wesel, Richard D. [1 ]
机构：
[1] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA
[2] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
来源：
2015 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY (ISIT) | 2015年
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D O I：
暂无
中图分类号：
TP301 [理论、方法];
学科分类号：
081202 ;
摘要：
We consider the problem of constructing (3,L) quasi-cyclic low-density parity-check (LDPC) codes from complete protographs. A complete protograph is a small bipartite graph with two disjoint vertex sets such that every vertex in the variable-node set is connected to every vertex in the check-node set by a unique edge. This paper analyzes the required lifting factor for achieving girths of six or eight in the resulting quasi-cyclic codes with constraints on lifting. The required lifting factors provide lower bounds on the block-length of such codes.
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页码：431 / 435
页数：5
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