Study Of V2V Radio Channel Properties And Channel Modeling Under Two Typical Driving Environments

With the development of wireless communication technology,combined with the great potential in intelligent transport system,traffic safety and social benefits,V2 V wireless communication has become a hot topic in the research field of wireless communication in recent years.Advantages shown from V2 V in driverless,improvement of efficiency and avoidance of collisions attract more and more interests of researchers.However,as the deepening of research,a large number of studies and measurement campaigns show that characteristics of V2 V wireless channels are significantly different from those of traditional cellular channels,which will vary depending on the different scenarios as well.In order to analyze and study the characteristics of V2 V wireless communication channels deeply,and play the role in the field of intelligent transportation and traffic safety,especially in promoting the development of intelligent transportation systems better,two measurement campaigns were carried out based on the theoretical analysis in this thesis.The main research contents are as the following:Based on the introduction of channel sounder applied by Super Radio AS,two measurement campaigns were carried out under typical driving environment.According to the results,the complex channel impulse response can be obtained from channel transfer function through the inverse Fourier transform,which can be used to the deep analysis for the V2 V radio channel.In this thesis,a system-theoretic description of wireless channels was presented,analysis in time domain,energy domain and frequency domain were descripted respectively,including power-delay profile,delay spread,delay-Doppler spectrum and so on.Then we made a comparison between the results of theoretical analysis and the measurement results.The path loss models and the typical theoretical modeling methods were introduced.According to the measurement data,V2 V channel models under the measurement scenarios were built.Finally,focus on the difference of match degree between different channel models,a new algorithm for model selection based on grey system theory and uncertaintymathematical theory was proposed.The new method was also applied in 5.9 GHz V2 V channel models in this thesis,and its effectiveness was proved.According to the measurement data under two different scenarios,by the analysis and calculation,we draw a conclusion as follow: for two measured scenarios,90% root mean square delay spread are within 8.287 us,7.26 us,respectively,and the Max.Doppler frequency shift is 17.41 Hz,682 Hz.We also observe several other paths approximately parallel to the main path,which were reflected at other cars on the way and buildings beside the way.This means these obstacles can make impact on the properties of V2 V radio channel as well.