Joint trajectory design and power allocation for unmanned aerial vehicles aided secure transmission in the presence of no‐fly zone

Unmanned aerial vehicles (UAVs) are widely considered as key enablers for future wireless networks due to their advantages, such high mobility and flexible deployment. In this paper, the UAV assisted secure communication system is investigated, where deployed mobile jammer prevent eavesdropper from overhearing confidential message. With objective of maximizing secrecy rate, a joint optimization problem involving trajectory transmit power UAV, well source node formulated. Moreover, effects Non-Fly Zone (NFZ) imperfect estimation on location also taken into consideration. As original hardly trackable, worst case rate (WCSR) assumption first employed bypass uncertainty brought by error. Then block coordinate descent (BCD) based algorithm proposed decompose three sub-ones, can be obtained in an iterative manner. Simulation results reveal that improve performance significantly. addition, robustness under error verified.