摘要
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.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2011年第2期161-168,共8页
Acta Photonica Sinica
基金
国家高技术研究发展计划(No.2009AA01Z220
No.2009AA01Z222)
国家自然科学基金(No.60977049/F050301)资助
关键词
光纤通信
接入网
低密度奇偶校验
正交频分复用
折射率渐变多模光纤
Optical communication
Access network
Low-Density Parity-Check（LDPC）
Orthogonal Frequency Division Multiplexing（OFDM）
Graded-Index Multi-Mode Fiber（GI-MMF）
