Research On Non-Stationary Channel For 5G Mobile-to-Mobile Scenario

With the emergence of the 5th Generation Mobile Communication(5G)technology,the mobile-to-mobile(M2M)communication system has developed rapidly in the direction of informatization and intellectualization.Due to the characteristics of low cost,low latency,and better signal-to-noise ratio,mobile communication terminals such as vehicles and unmanned aerial vehicle(UAV)in the M2 M communication system have been widely used in military,agriculture,transportation and other fields.However,the complex communication scenarios result in the non-stationary characteristics of the M2 M channel,which puts forward higher requirements for the efficient transmission performance of the communication system.Therefore,the design of a stable and reliable M2 M channel model is of great significance to the communication system.The main research contents of this thesis are as follows:1.In this thesis,a novel single-twin clusters non-stationary V2 V channel model is proposed for V2 V scenarios in M2 M communication systems.To describe the channel non-stationary characteristics during the switching of the antenna arrays and the movement of the transceiver,the model simulates the cluster variation of Non-Line-OfSight(NLOS)compent by using the Markov birth-death process in the time domain and array domain,and also the parameters such as path delay,path power,path arrival angle and departure angle are evolved in time and space.In order to further study the nonstationary characteristics of the channel,based on the angular parameter spectra obeying the Von Mises Fisher(VMF)distribution,the time autocorrelation function(ACF),spatial cross-correlation function(CCF)and Doppler spectral density(DPSD)function are derived.The simulation results show the correctness of the theoretical derivation and channel model,and which provide a new direction for V2 V channel modeling research.2.For UAV-to-Vehicle(UAV-V)communication scenarios in M2 M mobile communication systems,the thesis proposed a non-stationary Geometry-Based Stochastic UAV-V channel model.In order to describe the scatterer distribution around the receiver and transmitter,the scatterer distribution of the primary scattering path is simulated by concentric ellipsoidal surfaces;In secondary scattering path modeling,the scatterer distribution of the UAV side is simulated by concentric cylinders,and the scatterer distribution of the vehicle side is simulated by concentric hemispheres;Meanwhile,the scatterer distribution of ground primary reflection path is simulated by concentric circles on the base of the hemispheres.In addition,based on the two-dimensional angular parameter spectra obeying Von Mises distribution,Laplacian distribution,and VMF distribution,the time ACF,spatial CCF and DPSD function are derived.The simulation results show that the theoretical values and measured values have a good degree of fitting,and the proposed channel model can be used as a design scheme for UAV-V nonstationary channel modeling.