On the performance of hybrid RF and RF/FSO fixed gain dual-hop transmission systems
On the performance of hybrid RF and RF/FSO fixed gain dual-hop transmission systems
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混合RF和RF/FSO固定增益双跳传输系统的性能
DOI：
10.1109/siecpc.2013.6550751
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
F. Yilmaz
中科院分区：
文献类型：
--
作者：
I. S. Ansari;Mohamed;F. Yilmaz
在这项工作中，我们给出了一个双分支传输系统的性能分析，该系统由一条直接射频(RF)链路和一个由非对称射频链路和自由空间光(FSO)链路组成的双跳中继组成，并与没有直接射频路径的双跳传输系统进行比较，以了解分集对系统的影响。FSO链路考虑指向误差和两种类型的检测技术(即间接调制/直接检测(IM/DD)以及外差检测)。在选择组合分集方案的假设下，对系统的性能进行了评估。RF链路用瑞利衰落分布建模，而FSO链路用统一的Gamma-Gamma衰落分布建模。具体地，我们根据Meijer的G函数推导出这些系统的累积分布函数、概率密度函数、矩母函数和端到端信噪比的矩的新的精确闭合表达式。然后，我们利用这些结果给出了中断概率、高阶衰减量、二进制和多进制调制方案的平均误码率以及遍历容量的新的精确闭合表达式，所有这些都是根据Meijer的G函数来表示的。所有新的分析结果也通过基于计算机的蒙特卡罗模拟得到了验证。
In this work, we present the performance analysis of a dual-branch transmission system composed of a direct radio frequency (RF) link and a dual-hop relay composed of asymmetric RF and free-space optical (FSO) links and compare it without having a direct RF path to see the effects of diversity on our system. The FSO link accounts for pointing errors and both types of detection techniques (i.e. indirect modulation/direct detection (IM/DD) as well as heterodyne detection). The performance is evaluated under the assumption of selection combining diversity scheme. RF links are modeled by Rayleigh fading distribution whereas the FSO link is modeled by a unified Gamma-Gamma fading distribution. Specifically, we derive new exact closed-form expressions for the cumulative distribution function, probability density function, moment generating function, and moments of the end-to-end signal-to-noise ratio of these systems in terms of the Meijer's G function. We then capitalize on these results to offer new exact closed-form expressions for the outage probability, higher-order amount of fading, average error rate for binary and M-ary modulation schemes, and ergodic capacity, all in terms of Meijer's G functions. All our new analytical results are also verified via computer-based Monte-Carlo simulations.