OFDM光网络中软件定义的信号传输性能优化

[摘要] 针对正交频分复用（OFDM）光网络，提出两项OFDM传输性能优化技术，分别可以抑制OFDM信号的旁瓣分量和降低峰均功率比（PAPR）。通过在每个OFDM符号前插入一段软件定义的旁瓣抑制码（SSC），OFDM信号旁瓣可以得到显著抑制，从而有效降低密集波分复用-正交频分复用（DWDM-OFDM）系统中的相邻载波干扰。此外，利用软件定义的方式更改保护频带（FGB），以降低OFDM信号的PAPR，改善信号传输性能。通过实验对两项OFDM传输性能优化技术进行了验证。

[关键词] 正交频分复用；旁瓣抑制；峰均功率比

[Abstract] In this paper, we propose two techniques for optimizing transmission performance in OFDM networks. These techniques reduce the sidelobe component and PAPR of an OFDM signal. By inserting a software-defined sequence called sidelobe suppression code (SSC), the sidelobes of the OFDM signal are significantly suppressed, and the interference between adjacent channels in DWDM-OFDM systems can be reduced. Furthermore, we utilize frequency guard band (FGB) to reduce PAPR through software definition and improve transmission. Our two methods are validated by experiments.

[Keywords] orthogonal frequency division multiplexing; sidelobe suppression; peak to average power ratio