Exponentiated Weibull大气湍流下混合RF/FSO系统容量分析

Channel capacity analysis for hybrid RF/FSO system under exponentiated Weibull atmosphere turbulence

RF/FSO混合通信系统弥补了自由空间光通信受天气影响严重的问题,提高了系统的可用性。本文研究了Exponentiated Weibull大气湍流下双门限混合RF/FSO系统平均信道容量,考虑大气湍流和指向误差对平均信道容量的联合影响,利用Meijier G函数推导出平均信道容量的闭合表达式。根据平均信道容量闭合表达式进行了仿真,分析了在不同距离、大气湍流强度、抖动标准差和波束宽度条件下,平均信道容量随信噪比变化的关系。

Hybrid RF/FSO system solves the problem of the effects of severe weather on FSO,and improves system availability. Considering the combined effects of the atmosphere turbulence and pointing errors on the average channel capacity,the average channel capacity of the hybrid RF/FSO system is investigated under exponentiated Weibull atmosphere turbulence. The closed-form expressions for average channel capacity are derived based on a Meijer＇s G function. The relationship between the average channel capacity and the SNR under different parameters such as the atmosphere turbulence,the normalized jitter standard deviation and the normalized beam-width is analyzed by simulation.