Vehicle-to-vehicle Geometry Based Stochastic Channel Modeling And Analysis In Complex Block Scenes

Geometry based stochastic model(GBSM)can flexibly describe the signal propagation environment through a specific geometric structure,and is widely used in channel modeling research.However,in actual vehicleto-vehicle(V2V)communication scenarios at street intersections,the scatterers on buildings and vehicles present unique distribution characteristics,and the existing V2V channel model is no longer applicable.Therefore,the channel modeling work for complex block V2V communication scenarios is of great significance.The thesis mainly studies the channel modeling problem in complex block V2V communication scenarios,and designs two efficient threedimensional(3D)block V2V GBSMs to achieve efficient characterization of the scattering environment in block V2V communication scenarios.First,a 3D narrowband GBSM based on double-ring and quartercylindrical structures is proposed.On the basis of the model,only singlebounced and double-bounced paths are considered,and the channel impulse response and statistical characteristics of the model are deduced,while the distribution of scatterers on the double ring is used to simulate the vehicle traffic density(VTD).Furthermore,the effects of antenna placement,VTD and vehicle motion on channel statistical characteristics are studied using a simulation model with a limited number of scatterers.The simulation results show that the proposed simulation model is consistent with the original model using infinite scatterers,and it can effectively describe the time non-stationary characteristics of the V2V channel in the block scene,which can provide a reference for the modeling research of the narrowband V2V channel in the block scene.Secondly,in order to further meet the requirement of frequency selectivity and non-negligible multipath propagation delay in wideband communication systems,a 3D wideband GBSM based on double-ring,quarter-cylindrical and multi-confocal semi-ellipsoid structures is proposed.On the basis of the model,the channel impulse response and statistical characteristics of the model are deduced,in which the multipath components are divided flexibly and the time-varying Doppler frequency shift is considered.In addition,a more flexible truncated semi-ellipsoid model is designed based on the semi-ellipsoid structure,which provides a modeling scheme for the semi-ellipsoid-like scattering environment.Then,combined with the distribution of scatterers on the double ring and the power distribution of multipath components,the simulation of VTD is perfected,and the influence of VTD and motion on channel statistical characteristics is explored through simulation.The results show that the proposed simulation model can flexibly simulate a variety of wideband block communication scenarios,effectively describe the effects of VTD and motion on the channel,and provide theoretical guidance for the design of block wideband communication systems.