双广义Gamma湍流信道上的干扰受限混合MUD-RF/FSO双向式的协作网络
Interference-Limited Mixed MUD-RF/FSO Two-Way Cooperative Networks over Double Generalized Gamma Turbulence Channels
摘要：
本文研究了多用户射频/自由空间光（RF/FSO）双向式的【形】中继网络在干扰情况下的性能。FSO链路考虑了指向误差和两种类型的检测技术，即强度调制/直接检测以及相干解调，其被建模为双广义伽马（D-GG）湍流通道。另一方面，假设RF链路上的多个用户经历Nakagami-m衰落。利用Nakagami-m分布对多个共信道干扰器（CCI）在中继节点处破坏信号进行建模。具体地说，推导出整个系统的中断概率（OP）的精确封闭形式的表达式。此外，所考虑的系统的可达和速率（ASR）的封闭形式的表达。为了简化结果，OP和ASR的渐近近似导出的初等函数。文中给出的结果通过Monte-Carlo模拟进行了验证。
英文摘要：
In this letter, the performance of multiuser-radio frequency/free space optics (RF/FSO) two-way relay network in the presence of interference is investigated. The FSO link accounts for pointing errors and both types of detection techniques, i.e. intensity modulation/direct detection as well as coherent demodulation, which is modeled as double generalized gamma (D-GG) turbulence channel. On the other hand, the multiple users on the RF link are assumed to undergo Nakagami-m fading. Multiple co-channel interferers (CCIs) which corrupt the signal at relay node are modeled using Nakagami-m distribution. Specifically, the exact closed-form expressions for the outage probability (OP) of the overall system is derived. Moreover, the closed form expression for the achievable sum-rate (ASR) of the considered system is presented. In order to simplify the results,the asymptotic approximations of the OP and ASR are derived in terms of elementary functions. The results presented in the paper are validated by Monte-Carlo simulations.
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