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基于Gamma-Gamma模型的MIMO-FSO系统BER性能分析
徐建武,王红星,胡昊,刘敏
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(海军航空工程学院电子工程系，山东烟台 264001)

摘要:

分析了在Gamma-Gamma分布信道模型下采用强度调制/直接检测方式的多输入多输出FS O系统模型，在信道为独立同分布和独立不同分布两种情况下，分别推导出单发单收、多发单收和单发多收FSO系统的平均误码率计算公式，其近似封闭解形式用Meijer′s G函数表示出来，并仿真分析了三者的平均误码率性能，结果表明：在Gamma-Gamma分布模型下，当闪烁强度为1.2、信噪比为45 dB时，系统误码率为K分布的1/5；当平均误码率为10- 4时，采用4个发射天线的多发单收系统性能比单发单收系统提高了近60 dB；当平均误码率为10-5时，采用3个接收天线的单发多收系统性能比单发单收系统提高了近5 0 dB，这对无线光多发多收通信系统的理论分析和系统设计具有一定的指导意义。

关键词: 无线光通信空间分集多输入多输出 Gamma-Gamma分布误码率性能

DOI：

基金项目:

BER performance analysis of MIMO-FSO system based on Gamma-Gamma distribution model

XU Jian-wu,WANG Hong-xing,HU Hao,LIU Min

(Department of Electronic and Information Engineering,Naval Aeronautical and  Astronautical University,Yantai 264001,China)

Abstract:

The MIMO-FSO system model is analysed based on the GammaGamma distribu tion channels with IM/DD(Intensity Modulation/Direct Demodulation), under the ca ses of independent with identical distribution and independent with different distributions, the average error rates of SISO-F SO, MISO-FSO and SIMO-FSO systems are derived with the approximate closed form expressed by Meijer′s G function, and the average bit error rate(BER) performan ces ar e simulated respectively. Simulation results show that: under GammaGamma distr ibution；when SI and SNR are equal to 1.2 and 45 dB respectively, system′s average BER is one fifth of K distribution；when the average BER is 10-4, the performance of MISO-FSO system with 4 transmitting antennas is improved abou t 60 dB；when BER is 10-5, the performance of SIMO-FSO system with 3 r eceiving antennas is improved about 50 dB, which is meaningful to analyse and design MIMO-FSO systems.

Key words: free space optical space diversity MIMO Gamma Gamma distribution BER perform ance