提出了一种基于OFDM信号子载波信噪比的LDPC-OOFDM-PON系统纠错码方案。该方案通过对性能差的子载波采取不同码率的编码,改善了系统的总误码性能。采用Mat l ab软件对系统进行仿真,并在实验室搭建光链路,仿真和离线实验结果表明该系统...提出了一种基于OFDM信号子载波信噪比的LDPC-OOFDM-PON系统纠错码方案。该方案通过对性能差的子载波采取不同码率的编码,改善了系统的总误码性能。采用Mat l ab软件对系统进行仿真,并在实验室搭建光链路,仿真和离线实验结果表明该系统切实可行。展开更多
研究了光正交频分复用(optical orthogonal frequency division multiplexing,OOFDM)系统中采样时钟同步问题,提出了一种基于训练序列互相关特性的易于硬件实现的采样时钟频偏估计算法.算法的主要思想是对接收到的训练序列与本地已知训...研究了光正交频分复用(optical orthogonal frequency division multiplexing,OOFDM)系统中采样时钟同步问题,提出了一种基于训练序列互相关特性的易于硬件实现的采样时钟频偏估计算法.算法的主要思想是对接收到的训练序列与本地已知训练序列作互相关,利用该相关值周期性变化一次产生一个采样点数差的特性,由少量加法器和一个除法器得到采样时钟频率偏差(sampling clock frequency offset,SCFO)值.通过在一个强度调制直接检测的光正交频分复用(intensity-modulation and direct-detection-OFDM,IMDD-OFDM)系统上的实验,验证了该算法具有较好的准确度和抗噪性能.展开更多
100 G Ethernet is considered to become the next generation Ethernet standard for IP networks.Typical 100 Gb/s transmission systems and their performance are presented.Comparision and analysis for 100 Gb/s transmission...100 G Ethernet is considered to become the next generation Ethernet standard for IP networks.Typical 100 Gb/s transmission systems and their performance are presented.Comparision and analysis for 100 Gb/s transmission systems have been discussed.It is demonstrated that optical OFDM can be used in future 100 Gb/s/ch and long-haul system.展开更多
文摘研究了光正交频分复用(optical orthogonal frequency division multiplexing,OOFDM)系统中采样时钟同步问题,提出了一种基于训练序列互相关特性的易于硬件实现的采样时钟频偏估计算法.算法的主要思想是对接收到的训练序列与本地已知训练序列作互相关,利用该相关值周期性变化一次产生一个采样点数差的特性,由少量加法器和一个除法器得到采样时钟频率偏差(sampling clock frequency offset,SCFO)值.通过在一个强度调制直接检测的光正交频分复用(intensity-modulation and direct-detection-OFDM,IMDD-OFDM)系统上的实验,验证了该算法具有较好的准确度和抗噪性能.
基金supported by NSFC(no60872035)Youthful foundation of UESTC JX0707Key Youthful foundation of UESTC JX0801
文摘100 G Ethernet is considered to become the next generation Ethernet standard for IP networks.Typical 100 Gb/s transmission systems and their performance are presented.Comparision and analysis for 100 Gb/s transmission systems have been discussed.It is demonstrated that optical OFDM can be used in future 100 Gb/s/ch and long-haul system.
