Abstract
A thorough understanding of fundamental limits of wireless-powered unmanned aerial vehicle (UAV) relay networks in millimeter waves is still missing. We narrow this gap by investigating the outage performance of a UAV-assisted wireless network over fluctuating two-ray (FTR) channels. The FTR fading model is particularly appealing since well characterizes the wireless propagation in a wide range of frequencies, including those in millimeter waves. The proposed setup consists of a source-destination pair communicating with the assistance of a UAV, which is a wireless-powered relay station operating in full-duplex mode under the amplify-and-forward protocol. For the wireless energy harvesting at the UAV, wireless power transfer (WPT), simultaneous wireless information and power transfer (SWIPT), and self-recycling energy techniques are employed together. To characterize the system outage probability, we obtain an integral-form expression derived from an approximate analysis and a simple closed-form expression derived from an asymptotic analysis at the high signal-to-noise ratio (SNR) regime. Monte Carlo simulations are provided to validate the correctness of our theoretical results and provide insights on the network performance in terms of key system parameters. Interestingly, obtained results show that the FTR fading parameters corresponding to the first hop and second hop play no role on the system outage performance at high SNR. Instead, it is mainly governed by the effect of the residual self-interference at the UAV, leading to outage floors.
Highlights
We assume that the average channel gain between S and R and between R and D is determined by the path-loss effect, being given as i = di−, i ∈ {1, 2}, respectively, where di is the Euclidean distance between the nodes and = 4 is the path-loss exponent
In this paper, the outage performance of a wireless-powered full duplex (FD)-AF unmanned aerial vehicle (UAV) relay network operating over fluctuating two-ray (FTR) fading channels was analyzed
Our closed-form asymptotic result showed that the FTR fading parameters corresponding to the first hop and second hop play no role on the system outage performance at high signal-to-noise ratio (SNR)
Summary
MUCIN et al.: WIRELESS-POWERED FULL-DUPLEX UAV RELAY NETWORKS OVER FTR CHANNELS compared to the DF protocol, while maintaining a comparable performance at medium-to-high signal-to-noise ratio (SNR). The penalty in this case comes from the self-interference (SI) suffered at the receiver antenna of the relay from its own transmitter antenna, as a consequence of the simultaneous retransmission. In this regard, SI mitigation techniques have been the subject of several research efforts based on propagation, analog, and digital-domain approaches [7]–[9]
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