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针对光通信系统日益发展的需要,提出了一种的基于有限域准循环低密度奇偶校验(QC-LDPC)码的构造方法。该构造方法简单易行,可以有效避免四环的出现,具有良好的围长特性,同时能够自由地选择码长码率。仿真分析表明:通过该构造方法所构造的码率为93.7%的QC-LDPC(3780,3540)码的纠错性能优于利用随机构造方法所构造的SCG-LDPC(3969,3720)码和已广泛用于ITU-T G.975中的RS(255,239)码和ITU-T G.975.1中的LDPC(32640,30592)码,因而其更适合于光通信系统。
In order to meet the needs of the growing optical communication system, a construction method based on finite-area quasi-cyclic low-density parity-check (QC-LDPC) codes is proposed. The construction method is simple and easy, can effectively avoid the appearance of a tether, has good girth characteristics, and can freely select a code length rate. The simulation results show that the error-correcting performance of QC-LDPC (3780,3540) code constructed by this method is 93.7% better than that of SCG-LDPC (3969,3720) code constructed by random construction method It is widely used in the RS (255,239) codes in ITU-T G.975 and the LDPC (32640, 30592) codes in ITU-T G.975.1 and is therefore more suitable for optical communication systems.