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大气无线光通信(FSO)信号受大气湍流及光电转换器件影响,不确定性大。从探测接收光信号的实际过程出发,以大气信道和光电探测信道两个基本模型为基础进行理论推导,提出了弱湍流扰动下光电转换的离散计数概率和连续计数概率密度两个严格数学表达式,给出了其数值计算方法。在此基础上,推导出二进制强度调制下检测电流的概率密度计算式,建立了弱湍流无线光通信差错性能的数学计算模型,并据此对闪烁指数、背景噪声等因素影响进行仿真。结果表明,基于该模型的系统差错性能与预测分析相一致,所给模型可有效评估弱湍流条件下无线光通信系统性能。
Atmospheric wireless optical communications (FSO) signals are subject to atmospheric turbulence and optoelectronic conversion devices, with large uncertainties. Based on the actual process of detecting optical signals and theoretical derivation based on two basic models of atmospheric channel and photoelectric detection channel, two strict mathematical expressions of discrete counting probability and continuous counting probability density of photoelectric conversion under weak turbulence disturbance are proposed. , Gives its numerical method. Based on this, the formula of the probability density of the detection current under binary intensity modulation is deduced, and the mathematic calculation model of the weak turbulence wireless optical communication error performance is established. Based on this, the influence of the flicker index and the background noise is simulated. The results show that the system error performance based on this model is consistent with the predictive analysis. The proposed model can effectively evaluate the performance of wireless optical communication systems under weak turbulence.