Ray-tracing Based Channel Simulation And Analysis For Millimeter Wave Vehicular Network

With the rapid development of economy,the total number of vehicles in the world is increasing year by year.The huge number of vehicles has brought a series of problems such as traffic accidents,traffic congestion,traffic violations and so on.Based on the background,the Central Committee of the Communist Party of China(CPC)and the State Council jointly issued the “Outline of Building a Traffic Power” in September 2019,which for the first time included the intelligent transportation system(ITS)in the outline,greatly promoting its vigorous development.In the ITS,the Internet of Vehicles(IOV)is the most important part of intelligent vehicle connection with the help of the new generation of information and communication technology,which takes the moving vehicle as the information perception object.In terms of reducing traffic pressure,improving the level of environmental protection,and enhancing the level of driving safety,the application of IOV is quite helpful.With the increasing complexity of urban traffic conditions and the increasing burden of management,IOV communication need to provide more safety-critical vehicle applications which requires high reliability and low delay communication in the future.The Fifth Generation Mobile Communication System(5G)uses a large number of millimeter wave(mm Wave)bands whose spectrum resources have not been fully utilized.It can provide unprecedented spectrum and Gbit/s data rate for mobile devices to support the requirements of data rate and delay for various vehicle applications.Consequently,the research on the characteristics of the mm Wave vehicular channel in dense urban environment is becoming more and more important.In this dissertation,the typical urban scenario of Beijing is modeled,and the mm Wave vehicular wireless channel is simulated by ray tracing simulator.This dissertation mainly studies and completes the following work:(1)Referring to 3GPP model and ITU-R proposal,the meteorological attenuation for terrestrial link and satellite-terrestrial link are calculated in detail and implanted into the ray tracing simulator.The above links in the typical urban scenario are simulated by ray tracing simulator.Based on the output of the simulator,the meteorological attenuation is calculated quantitatively,and its influence on the key channel parameters and channel characteristics is compared and analyzed.(2)The co-frequency interference is studied between the terrestrial and the satelliteterrestrial link when they use the same frequency band.The carrier frequency of the communication link is the same as that of the interference link,and they are received by the receiver indiscriminately,which increases the difficulty of detecting the signal of communication link from the received signal.By calculating the signal-to-interference ratio,the interference between the terrestrial and the satellite-terrestrial link is analyzed.(3)In the ray tracing simulator,the definition of the dynamic moving mode of overtaking with constant speed change is added.The mm Wave vehicular channel characteristics are analyzed with consideration of the impact of overtaking and simulation configurations,including different antenna directions and various traffic flows.The effects of multi-antenna and beam switching of the receiver are evaluated under overtaking situation.To sum up,the key channel parameters of mm Wave vehicular wireless channel in the urban scenario are extracted by using the ray tracing simulator,and the channel characteristics are characterized,which provides theoretical and data support for the research of channel characteristics.This is helpful to deepen the understanding of the channel in the design and performance evaluation for the IOV communication system.