Secrecy Energy Efficiency Analysis of UAV-Enabled Communication Networks

Recent researches show that unmanned aerial vehicle (UAV) can offer an efficient solution to achieve wireless connectivity with high mobility and low cost. This letter investigates the secrecy energy efficiency (SEE) in a multi-tier UAV-enabled communication network via a threshold-based access scheme and multi-antenna technique, where the UAV-enabled transmitters, legitimate receivers and eavesdroppers are deployed randomly. In particular, we first exploit the association probability of a randomly located receiver and the activation probability of UAV-enabled transmitters. Then, we analyze the security, reliability, and SEE of the UAV-enabled networks. Simulation results are provided to show the effect of the predetermined access threshold on the reliability as well as security performance, and determine the optimal design parameters for a given UAV-enabled network to maximize the SEE.