三维非平稳车载信道建模及其空-时相关特性研究

3D non-stationary channel modeling and its space-time correlationanalysis for vehicle-to-vehicle communications

针对车载(V2V)通信系统无线传播场景的非平稳特性且无线信号三维传播时俯仰角(EAs)与水平角(AAs)非独立的特点,提出一种基于规则几何的新型三维非平稳V2V信道参考模型及其相应的仿真模型。为了刻画信道的非平稳特性,考虑了信号收发车辆以任意方向和速度运动而引起的多时变参数。针对EAs、AAs角度谱服从VMF联合分布的情形推导了模型的部分统计特性,并深入研究了车辆行驶环境、非平稳性以及收发端行驶状态对信道空-时相关函数的影响。仿真结果表明,提出的信道模型可以捕捉车辆行驶方向变化对信道空-时相关性的影响,多普勒功率谱密度理论值与实测值的基本一致、仿真模型与参考模型统计特性的高度拟合验证了理论推导的正确性和模型的实用性。

Aiming at the non-stationary characteristics of the wireless transmission scene of vehicle-to-vehicle(V2 V)communication system and the non-independent characteristics of elevation angles(EAs)and azimuth angles(AAs)in the three-dimensional(3 D)wireless transmission,a novel 3 D regular-shaped geometry-based stochastic reference model and the corresponding simulation model for vehicle-to-vehicle(V2 V)channels were proposed.In order to describe the non-stationary of the channel,the multiple-time-varying parameters caused by the transceiver vehicle moving in any direction and speed have been added in the proposed model.Some of the statistical characteristics of the model are derived for the case that the EAs and AAs Angle spectrum obey the joint distribution of von mises fisher(VMF),and the effects of vehicle driving environment,non-stationarities and the driving state at the receiving and transmitting terminals on the space-time correlation function of the channel are investigated in depth.Simulation results show that the proposed channel model can capture the influence of vehicle driving direction changes on the space-time correlation of the channel,the theoretical value of Doppler power spectral density(DPSD)is basically consistent with the measured value,and the statistical characteristics of the simulation model and the reference model are highly fitted,it demonstrates not only the utility of simulation models but also the correctness of the theoretical derivations and simulations.