Abstract In this research work, mixed radio frequency (RF)/free space optical (FSO) communication systems have been investigated in the presence of multiple interferers at the relay node. The considered system incorporates partial relay selection (PRS) using the available outdated channel state information (CSI) at the relay node to combat the effect of interference. The fading on the PRS-aided RF link has been modeled using the Rayleigh distribution whereas the statistics of the co-channel interferers (CCIs) at the relay node has been modeled using Nakagami- m fading distribution. On the other hand, FSO link has been assumed to undergo α − μ distributed atmospheric turbulence with pointing errors. To this end, the model on the FSO link considers the impact of both kinds of optical demodulation schemes i.e., intensity modulation direct detection (IM/DD) and coherent demodulation. For the system under study, exact closed-form expressions for the outage probability, bit error rate (BER) and ergodic capacity have been presented. Further to this, asymptotic high signal to noise ratio (SNR) approximate expressions have been derived for outage probability, BER and ergodic capacity to extract quick insights into the results. Finally, numerical examples have been demonstrated to validate the findings of the research work.

中文翻译：

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部分中继选择用于对抗 RF/FSO 协作中继中的同信道干扰影响

摘要 在这项研究工作中，研究了在中继节点存在多个干扰源的情况下混合射频 (RF)/自由空间光 (FSO) 通信系统。所考虑的系统结合使用中继节点处可用的过时信道状态信息 (CSI) 的部分中继选择 (PRS) 来对抗干扰影响。PRS 辅助 RF 链路上的衰落已使用瑞利分布建模，而中继节点处的同信道干扰 (CCI) 的统计数据已使用 Nakagami-m 衰落分布建模。另一方面，FSO 链路已被假定经历具有指向误差的 α - μ 分布的大气湍流。为此，FSO 链路上的模型考虑了两种光解调方案的影响，即，强度调制直接检测 (IM/DD) 和相干解调。对于所研究的系统，已经给出了中断概率、误码率 (BER) 和遍历容量的精确闭式表达式。此外，还针对中断概率、BER 和遍历容量导出了渐近高信噪比 (SNR) 近似表达式，以便快速了解结果。最后，通过数值例子验证了研究工作的结果。BER 和遍历能力以快速洞察结果。最后，通过数值例子验证了研究工作的结果。BER 和遍历能力以快速洞察结果。最后，通过数值例子验证了研究工作的结果。