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This paper studies a secrecy unmanned aerial vehicle (UAV) communicationsystem with coordinated multi-point (CoMP) reception, in which one UAV sendsconfidential messages to a set of cooperative ground receivers (GRs), in thepresence of several suspicious eavesdroppers. In particular, we consider twotypes of eavesdroppers that are non-colluding and colluding, respectively.Under this setup, we exploit the UAV's maneuver in three dimensional (3D) spacetogether with transmit power adaptation for optimizing the secrecycommunication performance. First, we consider the quasi-stationary UAVscenario, where we jointly optimize the UAV's 3D placement and transmit powercontrol to maximize the secrecy rate. Under both non-colluding and colludingeavesdroppers, we obtain the optimal solutions to the joint 3D placement andtransmit power control problems in well structures. Next, we consider themobile UAV scenario, where we jointly optimize the UAV's 3D trajectory andtransmit power allocation to maximize the average secrecy rate during the wholecommunication period. To deal with the difficult joint 3D trajectory andtransmit power allocation problems, we present alternating-optimization-basedapproaches to obtain high-quality solutions. Finally, we provide numericalresults to validate the performance of our proposed designs. It is shown thatdue to the consideration of CoMP reception, our proposed design with 3Dmaneuver significantly outperforms the conventional design with two dimensional(2D) (horizontal) maneuver only, by exploiting the additional degrees offreedom in altitudes. It is also shown that the non-colluding and colludingeavesdroppers lead to distinct 3D UAV maneuver behaviors.

Joint 3D Maneuver and Power Adaptation for Secure UAV Communication with CoMP Reception