5G网络中无人机-车辆非平稳信道模型与统计特性分析

针对无人机到车辆通信场景，提出了一种椭圆-圆柱-半球几何非平稳无人机-车辆信道模型。为了描述收发端周围散射体分布情况，一次散射径的散射体分布用同心椭圆面模拟；在二次散射径建模中，无人机侧散射体分布采用同心圆柱体模拟，并且车辆侧散射体分布使用同心半球体模拟；地面一次反射径的反射点分布则通过半球底面同心圆来模拟。为了进一步研究信道的非平稳特性，在各路径分量的二维角度服从Von Mises分布、Laplacian分布以及Von Mises Fisher分布的基础上，推导了时间自相关函数、空间互相关函数和多普勒频谱密度函数。仿真结果表明，理论值与测量值具有较好的拟合度，所提出的信道模型可以作为无人机到车辆非平稳信道建模的设计方案。

UAV-to-vehicle non-stationary channel model and statistical characteristics analysis in 5G network

For unmanned aerial vehicle to vehicle(UAV-to-Vehicle) communication scenarios,a non-stationary UAV-to-Vehicle channel model based on elliptical-cylindrical-hemisphere geometry is proposed.In order to describe the scatterer distribution around the receiver and transmitter,the scatterer distribution of the primary scattering path is simulated by concentric ellipsoidal surfaces.In secondary scattering path modeling,the scatterer distribution of the UAV side is simulated by concentric cylinders,and the scatterer distribution of the vehicle side is simulated by concentric hemispheres.Meanwhile,the distribution of reflection points on the ground primary reflection path is simulated by using concentric circles on the base of the hemispheres.In order to further study the non-stationary characteristics of the channel,based on the two-dimensional angles of each path component obeying Von Mises distribution,Laplacian distribution and Von Mises Fisher(VMF) distribution,the time autocorrelation function(ACF),spatial cross-correlation function(CCF) and Doppler spectral density(DPSD) function are derived.The simulation results show that the theoretical values are in good agreement with measured values,and the proposed channel model can be used as a design scheme for UAV-to-Vehicle non-stationary channel modeling.