移动散射体下的V2V信道相关性和多普勒谱特性研究

摘要

该文首次提出两种典型的移动散射体存在的车辆对车辆(V2V)的无线传播信道模型,一种是基于一次散射发射(SBT)和一次散射接收(SBR)的信道,另一种是基于两次散射(DB)的信道,并在这两种模型的基础上给出了同时包含一次散射发射,一次散射接收,两次散射和视距(LOS)分量的信道模型.在假设移动散射体的运动速度和方向都随机且运动速度较小和较大的散射体速度分别用指数分布和混合高斯分布来描述的情况下,给出了这些传播信道的复增益,通过计算得到了信道的自相关函数(ACF)和多普勒功率谱密度(PSD).文中还将理论计算得到的多普勒谱与已有文献的测量结果进行了对比,两者符合得较好.%Two typical Vehicle-To-Vehicle (V2V) propagation channel models are proposed for the first time.One is that the channel is composed by Single-Bounce Transmit (SBT) and Single-Bounce Receive (SBR)components.The other is that the channel is composed by Double-Bounce (DB) components.Based on the two models,another model consisting of SBT,SBR,DB,and LOS components is proposed.It is assumed that the local scatterers move with random velocities in random directions and the velocity distributions of the moving scatterers with low and high speed are assumed to follow exponential and Gaussian Mixture (GM) distributions,respectively.The complex channel gains of the proposed V2V channel models are proposed,and the corresponding AutoCorrelation Function (ACF) and Doppler Power Spectral Density (PSD) are derived.The theoretical results are also compared with the available PSDs by measurements and good agreements are found between them.