一种新型OOFDM符号同步技术  

A New Technique of Symbol Synchronization for OOFDM

作　　者：倪宝景[1] 李迎春[1] 韩景龙[1] 姜鹏[1] 傅磊[1] 

机构地区：[1]上海大学特种光纤与光接入网省部共建重点实验室,上海200072

出　　处：《上海大学学报（自然科学版）》2013年第2期132-137,共6页Journal of Shanghai University:Natural Science Edition

基　　金：上海市科委基金资助项目(11510500500;11511502500)

摘　　要：提出了一种简单、低复杂度、鲁棒性强的光正交频分复用(optical orthogonal frequency division multiplexing,OOFDM)符号同步技术,并予以实验验证.算法的主要思想是在OFDM符号的第0子载波上加载编码的直流(direct current,DC)信号,达到在接收端进行OFDM帧同步和符号同步的目的.由于该技术利用了本就闲置的第0子载波,不会额外损耗系统的带宽,因此,适用于OFDM无源光网络(OFDM-passive optical network,OFDM-PON)系统.在20 km标准单模光纤通信系统中,运用该同步算法实现了2.667 Gbit/s的实时数据传输.该技术还提供了在物理层增加网络安全机制的功能,实现了点到点和点到多点的OOFDM网络的符号同步.A simple,low cost and robust scheme for optical orthogonal frequency division multiplexing （OOFDM） symbol synchronization is proposed and experimentally tested.The main idea is to load a direct current（DC） signal on a special subcarrier to achieve OFDM symbol synchronization at the receiver. This techniqueis applicable to OFDM-PON（OFDM-passive optical network） system without additional bandwidth as the first zero subcarrier does not have any signal loaded originally.Using the proposed scheme,a real-time optical OFDM signal transmission at 2.667 Gbit/s over 20 km standard single-mode fiber is achieved. This scheme also offers an additional network security mechanism on the physical layer.Most importantly,it provides online real-time symbol synchronization for point-to-point and point-to-multipoint OOFDM network.

关 键 词：光正交频分复用 正交频分复用-无源光网络 同步算法 

分 类 号：TN915.63[电子电信—通信与信息系统]