Optimal Power Allocation for Minimizing Outage Probability of UAV Relay Communications
- Resource Type
- Conference
- Authors
- Tu, Hui; Zhu, Jia; Zou, Yulong
- Source
- 2019 11th International Conference on Wireless Communications and Signal Processing (WCSP) Wireless Communications and Signal Processing (WCSP), 2019 11th International Conference on. :1-6 Oct, 2019
- Subject
- Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
Photonics and Electrooptics
Signal Processing and Analysis
Relays
Power system reliability
Probability
Resource management
Rician channels
Propagation losses
Fading channels
UAV relaying
Rician fading
Power allocation
Outage probability
- Language
- ISSN
- 2472-7628
Unmanned aerial vehicle (UAV) networks have grown rapidly in recent years and become attractive for various emergence communications scenarios. In this paper, we consider a UAV acting as a relay node to assist wireless transmissions from a base station (BS) to a mobile user (MU). A closed-form expression of outage probability for the BS-MU transmission via UAV relaying is derived over Rician fading channels. We then formulate an optimization problem to minimize the outage probability of UAV relay communications with a constraint on the total transit power of the BS and UAV relay. It is proved that our formulated optimization problem is convex and an optimal power allocation solution is found for the outage probability minimization. Simulation results demonstrate that with an increasing power allocation factor, the outage probability initially decreases and then starts to increase, showing the existence of an optimal power allocation solution. Additionally, it is shown that the proposed optimal power allocation scheme significantly outperforms the conventional equal power allocation in terms of the outage probability.