Research On Modeling And Simulation Of V2V Channel Based On Geometry

With the concept of Vehicle-to-Everything(V2X)being deeply rooted among the people and the coming of beyond fifth generation /sixth generation wireless communication networks,in order to better protect the road traffic safety and cater for both the design and performance analysis of wireless communication systems in the V2 X environment,a stable and reliable vehicle-mounted wireless communication system must be established.Vehicle-to-Vehicle(V2V)communication technology is the V2 V communication which used in the vehicle terminal,and is not limited to the communication technology of the fixed base station,which can detect the status of other vehicles in real time,and can automatically predict the possibility of traffic accidents on the road at the same time,it can not only improves road traffic efficiency but also better ensuring road traffic safety.The performance of the wireless communication system depends on the wireless channel model.In the design of the vehicle-mounted wireless communication system,a V2 V channel model needs to be established according to the actual V2 V communication environment.In order to more accurately characterize the V2 V MIMO channel characteristics in complex wireless communication scenarios,this paper adopted the way of geometry-based stochastic model(GBSM),structured a novel 3D MIMO V2 V GBSM channel reference model on the basis of 2D MIMO V2 V GBSM.The main contents of the paper are as follows:Firstly,it summarizes both typical V2 V communication scenarios and existing V2 V channel modeling methods,focuses on GBSM,inferred the Rice fading channel model,and then proposed several commonly 2D geometric models,and inferred the angle relationship and Doppler shift in the model.with the V2 V channel time autocorrelation function,the effects of different scattering environments,primary scattering,secondary scattering and line-of-sight on the time-correlation characteristics of the V2 V channel are analyzed.Secondly,in order to accurately characterize the characteristics of the V2 V MIMO channel in complex wireless communication scenarios,it is extended on the basis of the existing literature model.Aiming at the urban street scattering environment which considering the distribution of moving and stationary effective scatterers in the environment,an improved method about 3D MIMO V2 V channel reference model is proposed.According to the relationship between angle and path length in the model,the theoretical expressions of auto correlation function and spatial cross correlation function of the model are derived,and the factors which influenced the V2 V channel space-time correlation characteristic are analyzed.The simulation results show that the space-time correlation characteristics of the V2 V channel are closely related to the distribution of scatters and the arrangement of antenna arrays in different scattering environments.At the same time,a reasonable algorithm is used to derive the simulation model,and the simulation results verify the accuracy of the model and the effectiveness of the algorithm.Finally,the influence of vehicle traffic density(VTD)on the statistical characteristics of V2 V MIMO channels is studied.According to the 3D V2 V channel reference model mentioned in this article,the theoretical expression of Doppler power spectrum density(DPSD),envelope level crossing rate and average fade duration are given.with the measured VTD data in the literature,this paper made a simulation graph of the statistical characteristics of the V2 V channel under the 2D model and the 3D model,then compared the similarities and differences under different VTD.The simulation results show that the expansion of the 3D model through the vertical dimension of the space is necessary,which further confirms that it is necessary to study the elevation angle of the scatters in V2 V communication;different VTD have significant effects on the statistical characteristics of the2 D and 3D V2 V channels.The low VTD scene always shows better channel performance than the high VTD scene.Finally,compared the reference model and the simulation model of different channel parameters,both of they showed good consistency,which proved the effectiveness of the simulation model.