Geometric Modeling And Analysis Of Narrowband MIMO Vehicle Communication Channel

Relative technologies of Internet of Vehicles,which was a part of the strategy of ‘Internet Plus' and ‘Made in China 2025',has become a research hotspot in the filed of wireless communication.Communication of Vehicle-to-vehicle of Vehicle Networking technology could provide collision warning effectively and reduce the probability of traffic accidents greatly.Therefore,V2 V communication technology has been under the highlight.As the environment of communication,characteristics of the physical wireless channel could affect the performance of communication system.Accordingly,communication environment need to be described by channel models when studying V2 V communication technology.V2 V communication works under condition of high-speed driving or restricted moving area,which causes its channel to be different from traditional cellular system channel.Thus the method of traditional cellular system could hardly apply to V2 V communication modeling.Since MIMO technology could improve channel capacity and reliability,establishing a vehicle communication system with MIMO technology can be a effective way considering that both transmitter and receiver are vehicles with large surface to install MIMO antenna system easily.In this thesis,V2 V communication modeling was studied to establish the real communication scenarios of channel model.The main research work and innovation of this thesis are as follows:(1)Vehicle communication scenarios were induced and abstracted.According to different application scenarios of vehicle communication,two scenarios were summarized in this thesis,namely,straight road scenario and intersection scenario.From the point of the need of irregular geometric modeling,the geometric model was abstracted.According to the parameters which may affect the channel model,18 different channel combinations were proposed and corresponding channel characteristics were analyzed deeply.This part laid a solid foundation for the subsequent establishment of the vehicle channel reference model for specific scenarios.(2)Reference models of narrow-band MIMO vehicle channel in straight road scenario and intersection scenario were established.The wireless communication channel model of vehicle in straight road scenario is deduced and discussed in detail.Considering the visible path between transmitter and receiver and the non-visible path transmission through one scattering,irregular geometric channel modeling method was introduced to establish the two-dimensional narrowband MIMO fading channel reference model.Besides two-dimensional model was extended to three-dimensional model by adding reflection coefficient variables based on scene.Furthermore,the statistical characteristic function of model was deduced and effects of Rice factor,direction of motion and other parameters on the statistical characteristics were analyzed in depth.(3)Deterministic model for narrowband MIMO vehicle channel was established in this thesis.A appropriate parameter calculation method was introduced to determine the random variables such as emission angle and altitude angle in the reference model and the finite harmonic superposition method was used to establish deterministic model.Additionally the influence of Rice factor,reflection coefficient and other parameters on the performance of deterministic models was analyzed.On the top of that,system-level simulation was carried out to study the change of bit error rate under different modulation modes,different parameters and different scenarios.The simulation results of the deterministic simulation model and the statistical characteristics of the reference model verify the correctness of the channel model.The research results of this thesis was aimed to provide theoretical support for further understanding the propagation law of narrowband MIMO vehicular channel.