为了研究了大气散射效应对光信号的影响,以雨粒子为例,从其物理特性出发,应用Mie散射理论和Joss雨滴谱分布,计算了雨粒子对光波传输的衰减,在此基础上分析了光散射效应对自由空间光通信-正交频分复用系统性能的影响。结果表明,在散射信道中,自由空间光通信-正交频分复用系统的性能主要取决于散射造成的光强度起伏方差,其次为散射造成的光强度衰减系数。

For studying the effects of atmospheric scattering to optical signals,taking rain particles as an example,starting from its physical properties and employing Mie scattering theory and Joss raindrop spectrum distribution,the light intensity attenuation coefficient caused by rain particles’scattering was calculated.On this basis,the scattering effect on the performance of the free space optical communication orthogonal frequency division multiplexing (FSO-OFDM) system was analyzed.The results show that the FSO-OFDM system performance in scattering channel primarily depends on the variance of light intensity caused by scattering,secondly depends on light intensity attenuation coefficient caused by scattering.