空间相干光通信中基于DSP的多普勒频移补偿技术  

Compensation technology of Doppler frequency shift in space coherent optical communication using DSP

作　　者：向劲松[1] 潘乐春[1] 张苗苗 张孝雷[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：《重庆邮电大学学报（自然科学版）》2011年第4期389-393,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：重庆市科委自然科学基金(CSTC2008BB2414);重庆市教委自然科学基金(KJ080513);重庆邮电大学自然科学基金(A2007-46)~~

摘　　要：目前通常采用光锁相环(optical phase-locked loop,OPLL)完成空间相干光通信中的相位同步。针对光锁相环性能受空间通信终端间多普勒频移影响的不足,采用基于数字信号处理(digital singnal procesor,DSP)的开环方法补偿多普勒频移,并将开环补偿方法应用于一种递推解调系统中,根据前一时刻的数据信息进行后一时刻的数据解调。仿真结果表明:采用基于DSP的开环补偿方法可以补偿多普勒频移,使空间相干光通信系统不使用光锁相环,且性能接近多普勒频移被完全补偿的理想状态。Optical phase-locked loop（OPLL） is often used in space coherent optical communication as the traditional way to achieve the phase synchronous. But the OPLL is affected by the Doppler frequency shift, so in this paper, we use an open-loop compensation technology based on DSP to compensate the Doppler frequency shift, and apply it to a recursive demodulate system, demodulating the next data according to the previous data information. Simulation results show that the open-loop compensation technology based on DSP is able to compensate the Doppler frequency shift, and allow the space coherent optical communication system to demodulate without any optical phase-locked loop, and the performance of the system can approach the ideal status which Doppler frequency shift is completely compensated.

关 键 词：空间相干光通信 多普勒频移 频偏估计 DSP开环补偿 

分 类 号：TN929.1[电子电信—通信与信息系统]