Construction Method of QC-LDPC Codes in Optical Communication Systems

doi:10.13190/jbupt.201303.21.yuanjg

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2013, Vol. 36 ›› Issue (3): 20-24.doi: 10.13190/jbupt.201303.21.yuanjg

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Construction Method of QC-LDPC Codes in Optical Communication Systems

YUAN Jian-guo, LIU Wen-long, HUANG Sheng, WANG Yong

Key Laboratory of Optical Fiber Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Received:2012-07-20 Online:2013-06-30 Published:2013-06-30

Abstract

Abstract:

To meet the increasing requirement on the transmission characteristics of optical communication systems, based on the structure of parity-check matrix of Richardson-Urbanke algorithm, a lower-complexity constructing method is proposed for the quasi-cyclic low-density parity-check (QC-LDPC) codes in the optical communication systems, and a QC-LDPC(4288,4020) code with 93.7% higher code-rate is also constructed. Simulation shows that the constructed QC-LDPC(4288,4020) code has net coding gain of about 1.7 dB over the classic RS(255,239) code which has been widely used for optical communication systems and 0.3 dB more than that of SCG-LDPC(3969,3720) code with the same 93.7% higher code-rate, and the NCG of the QC-LDPC(4288,4020) code is about 1.3 dB away from the Shannon limit at bit error rate BER of 10^-7; furthermore, the error floor of QC-LDPC(4288,4020) code is lower than that of the randomly constructed LDPC(4288,4020) with the column weight of 3.

Key words: optical communication system, quasi-cyclic low-density parity-check code, bit error rate, net coding gain

CLC Number:

TN929.53

YUAN Jian-guo, LIU Wen-long, HUANG Sheng, WANG Yong. Construction Method of QC-LDPC Codes in Optical Communication Systems[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2013, 36(3): 20-24.

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Construction Method of QC-LDPC Codes in Optical Communication Systems

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