长距离和多模接入网络中低密度奇偶校验-正交频分复用的性能研究

Performances of Low-density Parity-check Coded Orthogonal Frequency Division Multiplexing in Long Reach and Multi-mode Fiber Access Networks

研究了低密度奇偶校验编码与正交频分复用相结合的编码调制技术,从理论上分析了光纤链路中色散和频率选择性衰落的影响,并通过数值模拟仿真,比较了不同编码码率的编码调制信号在长距离单模光纤传输和多模光纤接入网络中的传输性能.仿真结果表明,采用码率为0.75的长码型非规则的低密度奇偶校验编码与正交频分复用相结合的编码调制技术更适合光纤通信系统中的长距离传输和多模接入网络.

The systems of optical OFDM high-speed transmission over single-mode fiber and multimode access network by employing the long LDPC coding technique were investigated.The dispersion and frequency selective fading effects of optical fiber link were theoretically analyzed,and the transmission performance of LDPC coded OFDM signals with three different rates in the long-distance transmission and multi-mode fiber access networks through the numerical simulation were compared.Simulation results show that the coded modulation technique of long irregular LDPC coded OFDM with 0.75 coding rate is the most effective for long-distance single mode fiber transmission and multi-mode fiber access networks.