A novel concatenated code based on the improved SCG- LDPC code for optical transmission systems  

作　　者：袁建国 谢亚 王琳 黄胜 王永 

机构地区：[1]Key Lab of Optical Fiber Communications Technology, Chongqing University of Posts and Telecommunications

出　　处：《Optoelectronics Letters》2013年第1期42-44,共3页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.61071117, 61275077 and 61003256);the Natural Science Foundation of Chongqing CSTC (No.2010BB2409);the Science and Technology Foundation of Chongqing Municipal Education Commission(No.KJ110519)

摘　　要：Based on the optimization and improvement for the construction method of systematically constructed Gallager (SCG) (4, k) code, a novel SCG low density parity check (SCG-LDPC)(3969, 3720) code to be suitable for optical transmission systems is constructed. The novel SCG-LDPC (6561,6240) code with code rate of 95.1% is constructed by increasing the length of SCG-LDPC (3969,3720) code, and in a way, the code rate of LDPC codes can better meet the high requirements of optical transmission systems. And then the novel concatenated code is constructed by concatenating SCG-LDPC(6561,6240) code and BCH(127,120) code with code rate of 94.5%. The simulation results and analyses show that the net coding gain (NCG) of BCH(127,120)+SCG-LDPC(6561,6240) concatenated code is respectively 2.28 dB and 0.48 dB more than those of the classic RS(255,239) code and SCG-LDPC(6561,6240) code at the bit error rate (BER) of 10 -7 .Based on the optimization and improvement for the construction method of systematically constructed Gallager （SCG） （4, k） code, a novel SCG low density parity check （SCG-LDPC）（3969, 3720） code to be suitable for optical transmission systems is constructed. The novel SCG-LDPC （6561,6240） code with code rate of 95.1% is constructed by increasing the length of SCG-LDPC （3969,3720） code, and in a way, the code rate of LDPC codes can better meet the high requirements of optical transmission systems. And then the novel concatenated code is constructed by concatenating SCG-LDPC（6561,6240） code and BCH（127,120） code with code rate of 94.5%. The simulation results and analyses show that the net coding gain （NCG） of BCH（127,120）＋SCG-LDPC（6561,6240） concatenated code is respectively 2.28 dB and 0.48 dB more than those of the classic RS（255,239） code and SCG-LDPC（6561,6240） code at the bit error rate （BER） of 10-7.

关 键 词：光传输系统 LDPC码 级联码 低密度奇偶校验 代码率 仿真结果 编码增益 SCG 

分 类 号：TN911.2[电子电信—通信与信息系统]