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分析光传输系统的传输特性与规则LDPC码的随机构造方法之后,提出LDPC码的一种新颖随机构造方法。基于该构造方法构造了一种新颖的码率为93.7%、冗余度为6.69%的规则SCG-LDPC(3969,3720)码,该规则LDPC码在将来的硬件实现中可相对地节省硬件存储空间和减少计算量。仿真分析表明:该新颖的SCG-LDPC(3969,3720)码在BER为10-8时,与同码率同冗余度的ITU-T G.975建议中RS(255,239)码和ITU-T G.975.1建议中LDPC(32640,30592)码相比,其净编码增益(NCG)和距离Shannon限都分别改善了约1.92dB和0.97dB。因而该规则LDPC码的纠错性能更为优越,更适用于光传输系统。
After analyzing the transmission characteristics of optical transmission system and the random construction of regular LDPC codes, a novel stochastic construction method of LDPC codes is proposed. A novel SCG-LDPC code (3969,3720) with a bit-rate of 93.7% and a redundancy of 6.69% is constructed based on this construction method, which can save hardware storage relatively in future hardware implementation Space and reduce the amount of computation. The simulation results show that the new SCG-LDPC (3969,3720) codes have better performance than RS (255,239) codes and ITU-T Compared with the LDPC (32640, 30592) codes in the G.975.1 Recommendation, both the net coding gain (NCG) and the Shannon limit are improved by about 1.92dB and 0.97dB, respectively. Therefore, the error correction performance of the rule LDPC code is more superior and is more suitable for the optical transmission system.