%0 Journal Article %A LI Hai-Rui %A MIAO Jian-Song %A YU Chu %A ZHENG Zi-Yuan %T Secrecy Energy Efficiency Maximization for UAV-Enabled Multi-Hop Mobile Relay System %D 2022 %R 10.19682/j.cnki.1005-8885.2022.1002 %J The Journal of China Universities of Posts and Telecommunications %P 81-91 %V 29 %N 3 %X

To deal with the secrecy issues and energy efficiency issues in the unmanned aerial vehicles ( UAVs) assisted communication systems, an UAV-enabled multi-hop mobile relay system is studied in an urban environment. Multiple rotary-wing UAVs with energy budget considerations are employed as relays to forward confidential information between two ground nodes in the presence of multiple passive eavesdroppers. The system secrecy energy efficiency ( SEE), defined by the ratio of minimum achievable secrecy rate ( SR) to total propulsion energy consumption (PEC), is maximized via jointly optimizing the trajectory and transmit power of each UAV relay. To solve the formulated non-convex fractional optimization problem subject to mobility, transmit power and information-causality constraints, an effective iterative algorithm is proposed by applying the updated-rate-assisted block coordinate decent method, successive convex approximation (SCA) technique and Dinkelbach method. Simulation

results demonstrate the effectiveness of the proposed joint trajectory design and power control scheme.

%U https://jcupt.bupt.edu.cn/EN/10.19682/j.cnki.1005-8885.2022.1002