DF-UAV中继广播通信系统航迹优化方法

doi:10.19665/j.issn1001-2400.2023.01.008

Abstract

Abstract:

An unmanned Aerial Vehicle(UAV) relay broadcast communication system can provide a high quality service and multiple business assistances for users.UAV trajectory optimization is one of the critical technical problems of the UAV relay communication system.The trajectory optimization methods are investigated to improve the link transmission performance of the UAV relay broadcast communication system with the decode-and-forward protocol.First,the UAV relay broadcast communication system model is established.The calculation formula for the interruption probability of a user link and that for the average interruption probability of the communication system are given.After that,a trajectory optimization method based on the criterion of minimizing the maximum outage probability for all users is proposed,and the mathematical expression for the accurate ergodic capacity of the UAV relay broadcast communication system is theoretically derived.Finally,the influence of system characteristic parameters such as service area radius,maximum turning angle,path loss factor and transmitting power on the optimal track,system interruption performance and system capacity performance of the relay UAV is verified by computer simulation.Meanwhile,the system interruption performance and system capacity performance of two relay forwarding protocols are compared under the same optimization criteria.Simulation results show that the outage performance and capacity performance of the decode-and-forward protocol are significantly improved compared with the amplify-and-forward protocol,which verifies the effectiveness of the proposed trajectory optimization criterion.

Key words: UAV relay, trajectory optimization, broadcast communication, decode-and-forward, traversal capacity

CLC Number:

V243

LI Dongxia,SONG Siyu,LIU Haitao. Trajectory optimization method of the DF-UAV relay broadcast communication system[J].Journal of Xidian University, 2023, 50(1): 66-75.

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Trajectory optimization method of the DF-UAV relay broadcast communication system

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