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在单光束发射和接收无线光通信(FSO)系统中,目前人们普遍接受的是光强闪烁在强湍流下服从负指数分布,在弱湍流下服从对数正态分布,而在强弱湍流下都适用的Gamma-Gamma分布则是研究的热点。在这几种分布的基础上,将它们推广到多光束发射和接收FSO系统,分别推导出了基于对数正态分布、负指数分布以及Gamma-Gamma分布的多光束发射和接收FSO系统的光强闪烁概率密度分布函数,建立起多光束发射和接收系统光强闪烁信道模型,并对基于负指数分布的多光束信道模型与通信距离、激光波长、接收孔径以及收发天线数目等参数的相互关系进行了具体的仿真分析。这对多光束发射和接收FSO系统的理论分析和系统设计具有一定的指导意义。
In single beam transmitting and receiving wireless optical communications (FSO) systems, it is generally accepted that light intensity flicker follows a negative exponential distribution under strong turbulence and a logarithmic normal distribution under weak turbulence, whereas under intense turbulence The applicable Gamma-Gamma distribution is the hot spot of research. Based on these distributions, we extend them to multi-beam transmitting and receiving FSO systems and derive the light of multi-beam transmitting and receiving FSO systems based on logarithmic normal distribution, negative exponential distribution and Gamma-Gamma distribution respectively Strong flashing probability density distribution function, the multi-beam transmitting and receiving system light intensity flicker channel model is established, and the correlation between multi-beam channel model based on negative exponential distribution and communication parameters, laser wavelength, receiving aperture and the number of transmitting and receiving antennas Have carried on the concrete simulation analysis. This is of some guiding significance for theoretical analysis and system design of multi-beam transmitting and receiving FSO systems.