大气激光通信下的OFDM的频偏及信道估计  

Frequency offset of atmospheric laser communication OFDM and channel estimation

作　　者：朱耀麟[1,2] 孟超[1] 张勇[1] 

机构地区：[1]西安工程大学电子信息学院,西安710048 [2]西安理工大学自动化与信息工程学院,西安710048

出　　处：《激光杂志》2013年第2期37-38,共2页Laser Journal

基　　金：陕西省教育厅自然科学基金资助项目(11JK1000);西安工程大学博士科研启动基金资助项目(BS0722);西安工程大学教改项目(2010JG12)

摘　　要：本文针对子载波频率偏移对大气激光通信下的OFDM系统的影响,在LS估计准则下,采用基于训练符号的信道估计来抑制频偏对系统产生的影响,从而精确恢复子载波。仿真结果表明:在大气激光通信下的系统中,子载波的频率偏移仍会对系统产生很大的ICI,通过对系统进行基于训练符号的信道估计,可以有效补偿子载波频偏对系统带来的影响,能显著降低系统的BER.,证明了此方法的可行性。Atmospheric laser communication OFDM system is impacted by the sub - cartier frequency offset in this paper. The impact of the frequency offset of the system is suppressed by the channel estimation based on the training symbol in LS estimation criteria. Sub - carriers are accurately recovered. Simulation results show that ICI is emerged by the sub - cartier frequency offset in atmospheric laser communication OFDM system. Channel estimation based on the training symbol is adopted in the system, the impact of the sub - cartier frequency offset can be effectively compensated, and the system＇ s BER can significantly reduced. Therefore, the method is proved to be feasible.

关 键 词：大气激光通信 OFDM 频偏 信道估计 

分 类 号：TN929.12[电子电信—通信与信息系统]