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由于大气湍流作用,使得自由空间光通信(free-space optical communication,FSO)系统同时受到平均光信号功率损失和随机功率衰落的影响,极大地影响了系统的通信质量。文中基于随机相位屏模型,数值仿真了光束在大气湍流中传输,分析和比较不同条件下大气湍流效应对激光传输质量的影响。在此基础上,给出了一种基于大气湍流效应的自由空间光通信信道模型,通过大量数值计算方法,得到FSO湍流信道传输函数的概率密度函数曲线,计算出在大气湍流影响下系统的误码率性能。
Due to the turbulence of the atmosphere, the free-space optical communication (FSO) system is affected by both the average optical signal power loss and random power fading, which greatly affects the communication quality of the system. In this paper, based on the random phase plate model, the numerical simulation of the beam transmission in atmospheric turbulence, analysis and comparison of atmospheric turbulence effects under different conditions on the quality of laser transmission. On this basis, a free-space optical communication channel model based on atmospheric turbulence effect is given. The probability density function curve of FSO turbulence channel transfer function is obtained through a large number of numerical calculation methods, and the error of the system under the influence of atmospheric turbulence is calculated Bit rate performance.