| In recent years,due to the large demand for highway intelligence,road safety,collision avoidance,and traffic efficiency,vehicle-to-vehicle(V2V)communications have received widespread attention.For the development of V2 V communication systems,knowledge of the underlying propagation channel is required.Channel modeling is an effective solution to study the actual physical fading by reliably describing the characteristics of the channel.Therefore,an in-depth understanding of vehicle radio propagation channels is essential for investigating and designing vehicle communication systems.In addition,the advantages of multiple input multiple output(MIMO)technology can meet the growing demand for high data transmission and improve link reliability by effectively utilizing multipath propagation.This article is mainly based on the three-dimensional(3D)spatial fading channel model,and analyzes the MIMO multi-antenna channel modeling and the application of vehicle mobile communication.It deeply studies the MIMO antenna array,spatial fading correlation(SFC),Doppler Power Spectral Density(DPSD)and channel capacity,in order to analyze the statistical channel characteristics of the model,provide an important theoretical basis for evaluating the performance of vehicle mobile communication systems.This article mainly researches from the following four aspects:First of all,based on the traditional T-shaped intersection,it is improved and expanded to develop an accurate and efficient propagation channel model,and a general crossroad spatial channel model is proposed.The model proposed in this paper considers the line-of-sight(LOS)path,single-bounce scattering path and double-bounce scattering path,and uses the geometric channel model to describe the transmission characteristics of signals in dense street environments.It is based on the angle of departure(AOD)and the angle of arrival(AOA),study the statistical characteristics of the model in time,frequency and space,and compare with the previous vehicle channel model to expand the analysis and application of outdoor vehicle wireless communication systems.Then,in order to better evaluate the propagation characteristics of the V2 V communication system in the tunnel environment,the elevation and azimuth angles of transmitting and receiving plane waves are further considered on the basis of the above model.For V2 V communication system in special LOS and non-line of sight(NLOS)mobile transmission environment,a 3D spatial broadband MIMO channel model is proposed.Both the transmitter and receiver of the model are in a moving state,and specific analysis of single-bounce scattering is made.The spatial physical channel model is used to derive the statistical characteristics of space-time-frequency.In-depth study of the influence of statistical characteristics such as the cross-section radius of the tunnel,the travel direction of the transmitter and receiver,and the antenna spacing on the channel in the spatial domain,in order to better analyze the performance of the vehicle mobile communication system in the tunnel environment;An efficient SOC simulation channel model is designed based on the physical channel model,and the time and frequency correlation functions of the two models are compared,indicating the practicability and reliability of the proposed model.Finally,in order to study the performance of the V2 V communication system in the tunnel environment under 5G communication technology,a general 3D non-stationary wideband twin-cluster channel model was constructed.In the proposed model,the receiving channel is composed of LOS propagation components and LOS propagation components passing through a twin-cluster model;in order to study the non-stationary characteristics of the clusters,a birth-and-death algorithm is introduced to the cluster appearance and disappearance on the array and time axis to model.Use statistical characteristics to study the impact of non-stationary properties of clusters on MIMO channels,including spatial cross-correlation function(SCCF),temporal auto-correlation function(ACF),and DPSD.Comparing the numerical results of the twin-cluster channel model with the simulation results and previous measurement results,it is shown that the proposed 3D model can well describe the real 5G vehicle communication in the tunnel environment. |
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