在Málaga湍流信道和Nakagami-m衰弱信道条件下,对基于选择合并技术的混合自由空间光/射频(FSO/RF)通信系统性能进行研究。在考虑指向性误差的情况下,推导了采用副载波调制和强度调制直接检测方案的混合FSO/RF系统的平均误码率和中断概率表达式,并利用Meijer G函数和扩展广义双变量Meijer G函数获得其闭合解。在不同的副载波调制方式、湍流强度、指向性误差及RF信道衰弱参数情况下,分别分析混合FSO/RF系统和单FSO系统的误码率和中断概率。仿真结果表明,相比单FSO系统,混合FSO/RF通信系统能有效提升通信系统性能。

This study investigates the performance of the hybrid free space optical/radio frequency (FSO/RF) communication system based on the selective combination technology under the conditions of the Málaga turbulent channel and the Nakagami-m fading channel. Considering the pointing errors, we deduce the expressions of the average bit error rate and the outage probability of the hybrid FSO/RF system that adopts the subcarrier modulation and intensity modulation direct detection scheme. Their closed-form solutions are then obtained using the Meijer G function and the extended generalized bivariate Meijer G function. The bit error rate and the outage probability performances of the hybrid FSO/RF and only-FSO systems are investigated under different subcarrier modulation schemes, turbulence intensities, pointing errors, and RF channel fading parameters. The simulation results show that compared with the only-FSO system, the hybrid FSO/RF communication system can effectively improve the communication system performance.