This paper investigates the performance of a dual-hop mixed free-space optical (FSO)/radio frequency (RF) system. To this end, the FSO link is subject to the Gamma-Gamma distribution effects that account for pointing error impairments and under both heterodyne detection and intensity modulation with direct detection (IM/DD) methods, while the RF link undergoes the α- F distribution fading. For amplify-and-forward (AF) and decode-and-forward (DF) relaying, we derived the closed-form expressions of various important performance metrics by using bivariate Fox's H-functions, such as the average bit-error rate (BER), end-to-end outage probability (OP), effective capacity, and ergodic capacity. We unveil the effects of system and channel parameters on performance. Furthermore, we provide an asymptotical analysis to discuss significant diversity gains. Note that our results include previous works as special cases, which provides a framework. Finally, our derived expressions have confirmed the correctness via exactly matching Monte Carlo simulation results.

中文翻译：

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混合 FSO/RF 衰落信道上双跳无线系统的性能分析


本文研究了双跳混合自由空间光学 (FSO)/射频 (RF) 系统的性能。为此，FSO 链路受到 Gamma-Gamma 分布效应的影响，该分布效应会导致指向误差损伤，并且在外差检测和直接检测 (IM/DD) 方法的强度调制下，而 RF 链路则受到 α-F 分布的影响褪色。对于放大转发 (AF) 和解码转发 (DF) 中继，我们通过使用二元 Fox 的 H 函数导出了各种重要性能指标的封闭式表达式，例如平均误码率 (BER) ）、端到端中断概率（OP）、有效容量和遍历容量。我们揭示了系统和通道参数对性能的影响。此外，我们提供了渐近分析来讨论显着的多样性增益。请注意，我们的结果包括以前的作品作为特例，这提供了一个框架。最后，通过精确匹配蒙特卡罗模拟结果，我们的推导表达式证实了其正确性。