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Recursive Design of High Girth (2,k) LDPC Codes from (k,k) LDPC Codes

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4 Author(s)
Xiongfei Tao ; Dept. of Electron. Sci. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan, China ; Lixin Zheng ; Weizhong Liu ; Dongsheng Liu

An approach to construct column-weight-2 LDPC codes with high girth is presented. The approach derives a column-weight-2 LDPC code from the Tanner graph of a (k,k) QC-LDPC code. By the construction, the new LDPC codes double in girth. To construct the (k,k) QC-LDPC codes with desired girth, a search algorithm is proposed in this paper. The approach generates an example of a (2,3) LDPC code with a girth of 36, which is larger than the column-weight-2 LDPC codes constructed by the previously methods.

Published in:

Communications Letters, IEEE  (Volume:15 ,  Issue: 1 )