城市无人机毫米波通信网络建模与性能分析

Modeling and Performance Analysis of Unmanned Aerial Vehicle Millimeter-wave Networks in Urban Areas

为克服毫米波信号的穿透能力弱,易被遮挡的问题,综合考虑城市地区建筑物特性与毫米波传输特性,提出一种无人机辅助的城市地区毫米波网络。基于随机几何理论,对提出的网络建模,无人机和建筑物的位置建模为两个独立分布的泊松点过程,建筑物的形状建模为长方体,高度服从瑞利分布。基于此模型,推导得到一个典型用户覆盖率的近似表达式。仿真结果表明,近似表达式在降低了计算复杂度的前提下,与仿真结果吻合,验证了近似分析的有效性。理论结果表明,存在最优无人机部署高度和密度,使系统覆盖率最大化。

Aiming at the problem that the penetration ability of millimeter-wave signal is weak and easy to be blocked,a millimeter-wave network assisted by unmanned aerial vehicles(UAVs)is proposed by considering the characteristics of buildings and millimeter wave transmission in urban areas was proposed.The proposed network was modeled based on stochastic geometry,where the positions of UAVs and buildings were identically distributed according to two Poisson point processes(PPPs).Besides,buildings’shapes were modeled as cubes and heights follow Rayleigh distribution.Based on the model,an approximation for the coverage probability of the typical user was deduced.The simulation result shows that the approximation matches the simulations with the reduced computational complexity and the effectiveness is demonstrated.Theoretical results show that there exists the optimal height and density of UAVs deployment to maximize the coverage probability.