大容量光通信系统中规则LDPC码的研究

为研究规则LDPC码在大容量光通信系统的性能,对不同列重和不同迭代次数的短规则LDPC码在大容量光信道中的误码率性能进行了数据仿真。发现确定码长的规则LDPC码,存在最优的列重,使得在相同的冗余度时,最大程度地改善大容量光通信系统的性能;此外,误码率随迭代次数的增加具有收敛的特性,LDPC码译码时应合理地选取迭代次数。

Study on Regular LDPC in High-Capacity Optical Communications System

In high-capacity optical communication systems, noise, dispersion and nonlinearity effect in optical fiber channel will seriously affect the performance of the system. The channel coding technology can effectively improve the reliability of high-capacity optical communication system. To study rules of regular LDPC codes in the performance of high-capacity optical communication system, the different column weights and different iteration numbers of regular LDPC code applying in high-capacity optical communica- tion system were simulated. Simulation found that optimal column exists in a determined length of regular LDPC code which can improve the performance of the large capacity optical communication system to the greatest extent with the same redundancy. In addition, Bit error rate of regular LDPC code has the character of convergence with the increase of the number of iterations, so the number of iterations should be reasonably selected in decoding.