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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10-7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。
Based on the construction method of SCG (4, k) code, the novel LDPC (3969,3720) codes for SCG-LDPC codes are optimized and improved. By increasing the code length, the code rate is 95.1 % Of the new SCG-LDPC (6561,6240) code, making it more in line with the optical code rate of high code rate system requirements. And a novel BCH (127,120) + LDPC (6561,6240) concatenation code is constructed by concatenating the SCG-LDPC (6561,6240) code with the BCH (127,120) code with a 94.5% code rate. The simulation results show that the net coding gain ratio of the newly constructed BCH (127,120) + LDPC (6561,6240) concatenated codes has been widely used in the classical RS (255,239) yards of optical communication systems with bit error rate of 10-7 And SCG-LDPC (6561,6240) codes increased 2.27dB and 0.49dB, respectively. Therefore, the concatenated code is more suitable for optical communication system.