The usage of unmanned aerial vehicle (UAV) as a cooperative mobile relay is considered to be a promising technique to enhance the performance of future wireless networks. This paper studies the system performance of a dual hop decode and forward, full/half duplex (FD/HD) UAV assisted relay systems, in the presence of direct link between source and the destination. A radio frequency based energy harvesting mechanism underlying simultaneous wireless information and power transfer technique is employed at the UAV to improve the system energy efficiency. For the proposed system design, we derive a closed-form expression for outage probability and system throughput with respect to the key metrics such as transmit power and time splitting factor over generalised weibull fading channel. The impact of self-interference effect on the system performance is studied in different aspects. The obtained results demonstrated that, increasing the fading parameter \((\beta)\) improves the overall system performance, significantly. In addition, FD operation with selection combining at the receiver offers an improved performance as compared to HD systems. Finally, the numerical simulation results are given, in order to validate the derived expressions.

无人飞行器（UAV）作为协作移动中继的使用被认为是增强未来无线网络性能的有前途的技术。本文研究了在源与目的地之间存在直接链接的情况下，双跳解码和前向全/半双工（FD / HD）UAV辅助中继系统的系统性能。在无人飞行器上采用了基于同时无线信息和功率传输技术的基于射频的能量收集机制，以提高系统能量效率。对于拟议的系统设计，我们针对关键指标（例如，广义Weibull衰落信道上的发射功率和时间分割因子）得出停机概率和系统吞吐量的闭式表达式。从不同方面研究了自干扰效应对系统性能的影响。所得结果表明，增加了衰落参数\（（\ beta）\）显着提高了整个系统的性能。此外，与高清系统相比，在接收机上进行选件组合的FD操作可提供更高的性能。最后，给出了数值模拟结果，以验证推导的表达式。