基于OSSK调制的MIMO星地激光通信上行链路系统

A MIMO terrestrial-satellite laser communication uplink system based on OSSK modulation

目的:研究光学空间移位键控(OSSK)调制的多输入多输出(MIMO)星地激光通信上行链路系统。方法:利用Malaga(M)分布表征近地面湍流光强闪烁、光束漂移、到达角起伏的联合影响。推导OSSK调制的MIMO星地激光通信上行链路误码率的闭合表达式。仿真分析信噪比、天顶角对系统误码率的影响,并且与差分相移键控、最小位移键控等传统调制进行对比,最后采用蒙特卡洛方法对仿真结果进行验证。结果:OSSK调制相较于传统调制可以在同等条件下降低约2个数量级误码率,增加接收天线可以进一步提高系统性能。为满足最低通信需求,OSSK调制可以获得更大的最大天顶角。结论:OSSK调制可以有效地优化通信性能,降低星地激光通信的成本,从而为星地激光通信系统的研究提供了有效方案。

Aims:This paper aims to study the multiple-input multiple-output(MIMO)terrestrial-satellite laser communication uplink system based on optical space shift keying(OSSK)modulation.Methods:The Málaga(M)distribution was used to describe the combined effects of near-ground turbulent light intensity scintillation,beam wander and angle of arrival fluctuation.The closed expression of the bit error rate(BER)of the OSSK modulation MIMO terrestrial-satellite laser communication uplink was derived.The influence of the zenith angle and the signal-to-noise ratio on the system error performance was simulated,analyzed and compared with traditional modulation such as differential phase shift keying and minimum shift keying.Finally,the simulation result was verified with the Monte Carlo method.Results:Compared with traditional modulation,the OSSK modulation reduced the bit error rate by about 2 orders of magnitude under the same condition;and the addition of receiving antenna improved the system performance.To meet the minimum communication requirements,the OSSK modulation could obtain a larger maximum zenith angle.Conclusions:The OSSK modulation can effectively optimize communication performance,reduce the cost of terrestrial-satellite laser communication,and provide an effective solution for the research of terrestrial-satellite laser communication systems.