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中文摘要：
基于SCG（4，k）码的构造方法对SCG-LDPC码进行优化改进，构造一种适用于光通信系统的新颖LDPC（3969，3720）码，通过增大其码长，构造码率为95．1％的新颖SCG—LDPC（6561，6240）码，使其码率更符合光通信系统的高码率要求。并用SCG—LDPC（6561，6240）码与码率为94．5％的BCH（127，120）码进行级联，构造出一种新颖的BCH（127，120）＋LDPC（6561，6240）级联码。仿真分析表明：在误码率为101时，新构造的BCH（127，120）＋LDPC（6561，6240）级联码的净编码增益比已广泛应用于光通信系统的经典RS（255，239）码和SCG—LDPC（6561，6240）码分别提高了2．27dB和0．49dB。因而该级联码更适合于光通信系统。
英文摘要：
A novel SCG low density parity check SCG-LDPC（3969,3720） code for optical communication systems, based on the optimization and improvement for the construction method of Systematically Constructed Gallager（SCG） （4 ,k） code, was constructed. The novel SCG-LDPC （6561,6240） code with the code-rate of 95.1% was constructed by increasing the code-length of SCG-LDPC（3969,3720）, so that the code-rate of LDPC codes can better meet the high code-rate requirements of optical communication systems. And then the novel BCH （127,120）＋LDPC （6561,6240） concatenated code was constructed by concatenating SCG-LDPC（6561,6240） code and BCH（127,120） code with the code-rate of 94.5 %. The simulation analysis shows that at the bit error rate（BER） of 10-7, the net encoding gain（NCG） of the BCH（127,120）＋LDPC（6561, 6240） concatenated code is respectively 2.27 dB and 0.49 dB more than those of the classic RS （255,239） code and SCG-LDPC（6561,6240） code. Therefore, the novel BCH（127,120） ＋LDPC （6561,6240） concatenated code can be better suitable for optical communication systems.
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