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The goal of this paper is to investigate the security performance of the multi-antenna unmanned aerial vehicle (UAV)-enabled mobile relaying system with a multi-antenna destination in the presence of a multi-antenna eavesdropper. To improve the secrecy outage probability performance, we propose a location-based three dimensional (3D) beamforming scheme without the channel state information of the destination and the eavesdropper. To this end, we first derive the expression of the secrecy outagedoi:10.1109/access.2019.2898995 fatcat:iz2wpucmvfgulkadbrmvbitd5u