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Impact of RF I/Q Imbalance on Interference-Limited Mixed RF/FSO TWR Systems with Non-Zero Boresight Error
IEEE Wireless Communications Letters ( IF 6.3 ) Pub Date : 2021-02-01 , DOI: 10.1109/lwc.2020.3033528
Abhijeet Upadhya 1 , Juhi Gupta 2 , Vivek K. Dwivedi 2 , Mohamed-Slim Alouini 3
Affiliation  

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.

中文翻译:

RF I/Q 不平衡对具有非零视轴误差的干扰受限混合 RF/FSO TWR 系统的影响

在这封信中,我们研究了一个通用模型,用于评估同相/正交相位不平衡 (IQI) 对非对称双跳射频/自由空间光 (RF/FSO) 双向中继 (TWR) 系统的影响。中继中存在多个同信道干扰 (CCI)。RF 和 FSO 链路上的衰落分别使用 K 分布和双广义 Gamma (D-GG) 湍流模型进行建模。FSO 链路上已经考虑了非零视轴指向误差和光解调方案类型的影响。为此,已经为经受 D-GG 辐照且具有非零视轴指向误差的 FSO 链路导出了一个封闭形式的概率密度函数 (PDF)。此外,还给出了断电概率的精确和高信噪比 (SNR) 渐近表达式。为了深入了解系统的吞吐量,已推导出可实现总和率 (ASR) 的近似和渐近表达式。结果表明,所考虑的 TWR 系统的可靠性和吞吐量依赖于射频前端的 IQI 和干扰强度。
更新日期:2021-02-01
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