OFDM-UAV中继广播通信系统航迹优化方法

doi:10.19665/j.issn1001-2400.20240305

Abstract

Abstract:

To improve the performance of the unmanned aerial vehicle (UAV) relay broadcast communication system,taking into consideration the entire communication links from the base station to the UAV and from the UAV to the users,the orthogonal frequency division multiplexing (OFDM) based trajectory optimization method is proposed for the UAV relay broadcast communication system with frequency selective fading channels.First,the OFDM-based UAV relay broadcast communication model is provided.Then,approximate calculation formula for the interruption probability for a single-user node and that for the system average interruption probability are theoretically derived.Furthermore,two trajectory methods for the relay UAV are proposed based on the optimization criteria of minimizing the average interruption probability and minimizing the maximum user interruption probability.The effectiveness and correctness of the proposed optimization method are demonstrated by computer simulations,which indicates that the OFDM-based UAV relay broadcasting communication system can effectively overcome frequency-selective fading,and achieve better connectivity under the decode-and-forward transmission mode than the amplify-and-forward mode in multipath channels.The interruption performance of the system,derived based on the criterion of minimizing average interruption probability,surpasses that obtained by minimizing the maximum user interruption probability criterion.

Key words: UAV relay, broadcast communication, orthogonal frequency division multiplexing, trajectory optimization, interruption probability

CLC Number:

V243

LI Dongxia, MENG Yan, HUANG Gengming, LIU Haitao. Trajectory optimization method for the OFDM-UAV relay broadcast communication system[J].Journal of Xidian University, 2024, 51(4): 91-101.

Figures/Tables 8

参数	数值
信道类型	频率选择性衰落信道
BS、UAV节点发射功率 $P B σ n 2 、 P R σ n 2 /$ dB	80
SNR门限γ_th/dB	5
BS节点位置坐标/m	[1 500,0,0]
UAV节点初始位置坐标/m	[0,-400,500]
UAV飞行速度v/(m·s^-1)	25
UAV初始航向角/rad	1(与x轴夹角)
UAV最大航向角δ_max/(°)	15
用户服务范围半径R/m	150
用户数目N	300
子信道总数目K	128
信道路径数量L₁=L₂	3
信道路径损耗因子α	1
p乘指数	45
UAV节点位置更新周期/s	1
仿真时长T_max/s	150

References 19

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Trajectory optimization method for the OFDM-UAV relay broadcast communication system

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