光OFDM系统中几种同步算法的对比分析  

Comparison Analysis on the Performance of Several Synchronization Algorithms for Optical OFDM Systems

作　　者：袁建国[1] 李好[1] 梁天宇[1] 何清萍[1] 王琳[1] 刘文龙[1] 谢亚[1] 蒋秋照[1] 

机构地区：[1]重庆邮电大学光纤通信技术重点实验室,重庆400065

出　　处：《半导体光电》2012年第4期544-547,共4页Semiconductor Optoelectronics

基　　金：国家自然科学基金项目(61071117;61003256);重庆市自然科学基金项目(2010BB2409);重庆市教委项目(KJ110519)

摘　　要：对光OFDM系统中的三种同步算法进行了理论分析,基于仿真实验,针对定时度量、定时偏差、丢帧率三个性能参数进行了对比分析。仿真分析表明T.Schmidl&D.Cox算法由于循环前缀(Cyclic Prefix,CP)缘故使得其定位精确性欠佳,偏差较大,无法进行精确定位,但算法稳定性及丢帧率方面具有很好的性能。而H.Minn和Li-xun Huang&Li-jun Sun两种同步算法定位精确性相对较好,偏差较小,但在稳定性及丢帧率方面,后者优于前者。因而在这三种同步算法中,Li-xun Huang&Li-jun Sun算法性能较好,适应性较强,更具实际应用价值。The theoretical analysis and simulations on three kinds of synchronization algorithms for optical orthogonal frequency division multiplexing （OFDM） systems were performed. Based on simulation experiments, comparative analysis on the performance of the three algorithms for the timing metric, timing estimator and frame loss rate was carried out. The simulation results show that T. Schmidl ＆- D. Cox algorithm can not obtain an accurate timing estimator and has a greater offset because of the existence of the cyclic prefix（CP）, but it has a good performance on the stability and frame loss rate. H. Min algorithm and Li-xun Huang ＆~ Li- jun Sun algorithm do better on accuracy of timing estimator, in meantime, Li-xun Huang ~ Li- jun Sun algorithm is better than H. Min algorithm on performances of stability and frame loss rate. As a result, Li-xun Huang ＆ Li-jun Sun algorithm among the three synchronization algorithms has better performance and adaptabilities, so it has better practical application value.

关 键 词：光OFDM 定时偏移估计 帧同步 算法 

分 类 号：TN929.11[电子电信—通信与信息系统]