Outage probability optimization for UAV-enabled wireless relay networks in fading channels

Abstract In this paper, we consider a mobile wireless relaying system, where a fixed-wing unmanned aerial vehicle (UAV) flies in a circular manner to provide continuous relaying between two disconnected ground stations. The system employs a UAV to ferry data from source to destination in a time division (TD) manner with limited energy budget. To improve the outage performance of this system in fading channels, we develop time and power allocation schemes for the source and relay nodes. Our approach does not depend on instantaneous channel state information. Instead, we assume that only channel statistics (i.e., mean and variance) are known at the transmitters. In Rayleigh fading channel, we show that the outage probability optimization problem is a convex optimization problem, which can be solved by standard convex optimization techniques. In Rician fading channel, we develop an asymptotic optimal time and power allocation scheme to minimize the outage probability in high signal-to-noise ratio (SNR) regime. Our derivation indicates that the proposed time and power allocation schemes in Rayleigh channel and Rician channel are identical. Numerical results show that significant improvement can be obtained through the proposed time and power allocation schemes.

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