Research On Geometry-Based Channel Model And Its Statistical Characteristics In V2V Scenarios

Vehicle-to-Vehicle(V2V)communication plays an important role in the deployment and application of internet of vehicles technology,which lays the foundation for the realization of vehicle-road collaboration,autonomous driving and smart city,and has attracted wide attention from industry and academia.Accurate recognition and modeling of wireless channels is the basis of communication system design,performance evaluation and standardization.However,V2 V communication is characterized by complex scattering environment,high moving speed and fast time-varying,which makes traditional cellular mobile channels no longer suitable for V2 V communication scenes.Therefore,it is of great significance to establish an effective and reliable V2 V channel model with reasonable methods and explore key channel statistical characteristics.Firstly,a novel 3D V2V Multiple Input Multiple Output(MIMO)wideband channel model based on geometry is proposed.The statistical characteristics of the channel,such as the spacetime correlation function,the doppler power spectral density,the envelope level crossing rate and the average fading duration are derived in detail.On this basis,the influence of various channel influencing factors on the channel statistical characteristics was explored,and the variation trends of channel statistical characteristics with antenna configuration parameters,the motion speed of transceiver vehicles,the motion speed of scatterers,and the distribution state of scatterers were obtained.The differences of channel characteristics in different communication scenarios were compared.The correctness of the derivation and the rationality of the model are verified by numerical simulation and measured data.Based on a reasonable parameter calculation method,a simulation model which is in good agreement with the theoretical model is also presented.Secondly,when the wide-sense assumption is no longer valid,we extend the stationary channel model in to a non-stationary channel model.Combining the time-varying of model parameters and the birth-death process of multipath components to describe the non-stationary property of the channel in the time domain,the time evolution scheme of the non-stationary channel is proposed.The update process of the time-varying parameters such as the number of taps,distance,angle,delay and power is derived,which further extends the application scope of the proposed model.On this basis,the time-varying statistical characteristics of the non-stationary channel are derived and simulated.The simulation results show that the proposed non-stationary channel model can effectively simulate the non-stationarity of the V2 V MIMO channel.This paper provides a certain theoretical basis for the design of vehicular wireless communication system and the evaluation of communication performance under various scenarios,and discusses the channel influencing factors reasonably combined with the actual scenarios.The numerical simulation results of the model provide some important conclusions for obtaining good communication performance.In addition,this model has enriched the channel model base in V2 V scenarios,and further expanded the research in the field of V2V channel modeling.