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基于有限域循环子群方法提出了一种结构简单,可以灵活选择码长、码率,并且编译码复杂度低的准循环低密度奇偶校验(QC-LDPC)码构造方法。利用此方法构造出适合光通信系统传输的规则QC-LDPC(5334,4955)码。仿真结果表明该码型利用和积迭代译码算法在加性高斯白噪声信道中取得了很好的性能,比已广泛应用于光通信中的经典RS(255,239)码具有更好的纠错性能。因此所构造的QC-LDPC(5334,4955)码能较好地适用于高速长距离光通信系统。
Based on the finite field cyclic subgroup method, a quasi-cyclic low-density parity-check (QC-LDPC) code construction method with simple structure, flexible choice of code length and code rate, and low complexity of coding and decoding is proposed. This method is used to construct a regular QC-LDPC (5334, 4955) code suitable for optical communication system transmission. The simulation results show that the code pattern achieves good performance in additive white Gaussian noise channel by using sum-of-product iterative decoding algorithm and has better error correction performance than the classical RS (255,239) code which has been widely used in optical communication . Therefore, the QC-LDPC (5334, 4955) code constructed can be well suited to high-speed long-distance optical communication systems.