论文标题
RF I/Q不平衡对具有非零孔误差的干扰限制的混合RF/FSO TWR系统的影响
Impact of RF I/Q Imbalance on Interference-Limited Mixed RF/FSO TWR Systems with Non-Zero Boresight Error
论文作者
论文摘要
在这封信中，我们研究了一个通用模型，该模型在存在多个共渠道干扰器（CCIS）的情况下，评估了相对双hop射频/自由空间光学（RF/FSO）双向继电器（CCIS）在不对称的双HOP射频/自由空间光学（RF/FSO）系统中的影响。 RF和FSO链路上的褪色分别是使用K分布和双重概括（D-GG）湍流模型建模的。在FSO链接上已经考虑了非零孔指向误差和光学解调方案的类型的影响。为此，已经为FSO链路得出了闭合形式的概率密度函数（PDF），该链接正在使用非零的孔指向误差，而D-GG辐照度均具有D-GG辐照度。此外，已经提出了用于中断概率的精确和高信噪比（SNR）。为了了解系统的吞吐量，已经得出了可实现的总和率（ASR）的近似和渐近表达式。结果表明，在RF前端提供了对IQI的可靠性和吞吐量的依赖性以及对考虑的TWR系统的干扰强度。
In this letter, we investigate a generic model assessing the effect of in-phase/quadrature-phase imbalance (IQI) on an asymmetric dual hop radio frequency/free space optical (RF/FSO) two-way relay (TWR) system in the presence of multiple co-channel interferers (CCIs) at the relay. The fading on the RF and FSO links have been modeled using K-distribution and double generalized Gamma (D-GG) turbulence model, respectively. The impact of non-zero boresight pointing error and type of optical demodulation schemes have been considered on the FSO link. To this end, a closed-form probability density function (PDF) has been derived for the FSO link undergoing D-GG irradiance with non-zero boresight pointing error. Furthermore, the exact and high signal-to-noise (SNR) asymptotic expression for outage probability have been presented. To gain insights into the throughput of the system, approximate and asymptotic expressions for the achievable sum rate (ASR) have been derived. The results show dependency of reliability and throughput offered on IQI at the RF front-end and strength of interference for the considered TWR system.
