三跳混合FSO/RF/VLC中继系统性能研究

On the performance of mixed triple-hop FSO/RF/VLC relay system

提出了一个三跳混合自由空间光(FSO)通信/射频(RF)/可见光通信(VLC)中继通信系统,分析了该通信系统的中断概率性能.在此系统中,FSO信道遵循gamma-gamma分布,RF信道遵循瑞利分布.首先,推导了以Meijer’s G函数表示基于混合FSO/RF/VLC系统端到端γ的累积分布函数(CDF)的闭合表达式;然后,基于信道统计信息,进一步推导了系统的中断概率;最后,分析了不同参数对系统中断概率性能的影响.仿真结果表明:FSO信道中的大气湍流参数、VLC信道LED灯的高度及接收处的视野均对系统中断性能造成了影响.

In this paper,a three-hop hybrid free space optical(FSO)communication/radio frequency(RF)/visible light communication(VLC)relay communication system was proposed and the outage probability performance of the proposed systemwas analyzed.Gamma-gamma distribution was followed by the FSO channel,while the RF channel was subject to Rayleigh distribution.The novel exact closed-form expressions for cumulative function of the end-to-end signal-to-noiseγof the proposed system in terms of Meijer’s G function were firstly derived.Secondly,based on the channel statistics,the outage probability of the system was further deduced.Finally,the influence of different parameters on the system outage probability performance was analyzed.Simulation results showed that system outage probability performance could be affected by atmospheric turbulence parameters in FSO channels,LED light height in VLC channels and receiving vision field.