Multi-scenario Wireless Channel Measurement And Characteristics Analysis Based On LTE-V2X

Vehicle-to-X(V2X)communication technology,as a typical application of Internet of Things technology in the high-speed field of China’s new infrastructure,has received strong support from government departments at all levels such as the State Council,the National Development and Reform Commission and the Ministry of Industry and Information Technology in recent years.In order to promote the development of V2 X communication technology in China and create a mature commercial operation system for the V2 X industry,the national government has coordinated various departments and units to establish a special committee for the development of the V2 X industry.At present,China is promoting the V2 X communication technology based on cellular communication system(Long Term Evolution-Vehicle to X,LTE-V2X).Since the wireless channel model is the basis for the design and optimization of the communication system,as well as network deployment and planning,before the formal deployment of the LTE-V2 X the communication system network,it is of great engineering significance to develop a standard channel model for different scenarios.In this paper,the current channel measurement activities and standardized channel models related to V2 X communication systems are investigated and analyzed.We find that the current channel models are not suitable for LTE-V2 X communication systems.Then,according to the LTE-V2 X communication system standard,the channel measurement system is built.Next,for the three scenarios of highway straights,urban straights,and tunnels,field channel measurement is carried out in the LTE-V2 I communication system between vehicle and roadside equipment(Vehicle-toInfrastructure,V2I).Finally,based on the measured channel data,the wireless channel propagation characteristics of the three scenarios are analyzed.Compared with the traditional cellular communication system,the path loss exponent of highway straight road and urban straight road scenarios in the LTE-V2 I communication system is larger.According to the analysis,this is because the deployment position of transmitters in the LTE-V2 I communication system is lower,and the signal propagation is more seriously affected by occlusion.Due to the influence of the waveguide effect,the energy of the signal in the tunnel scenario is concentrated and the path loss is less than that in the free space.Compared with highway straight road and urban straight road scenarios,the tunnel scenario has a more complex signal propagation environment and serious multipath phenomenon due to its closure.The rich multipath information makes the delay spread and Doppler spread more serious in the tunnel scenario,but also it reduces the correlation between the two antennas at the receiver side,so as to enhance the reliability of the LTEV2 I communication system.In addition,according to the non-stationary characteristics of the LTE-V2 I communication system,the stationary distances of highway straight road scenario and urban straight road scenario under different stationary thresholds are solved.Due to the presence of moving scatterers in the urban straight road scenario,the stationary distance under the same stationary threshold is shorter than that in the highway straight road scenario.According to the channel characteristics of the tunnel scenario,the reasonable deployment position of roadside equipment is discussed.The antenna correlation on the receiving side is studied,and two factors that affect the correlation coefficient are obtained.Through the above analysis of the channel characteristics of the three scenarios,it can provide a reference for the standardization of the LTE-V2 X channel.