A Non-Stationary V2V MIMO Channel Model Relying On Moving Trajectories And Its Statistical Properties

The vehicular networking communication system has great value in improving efficiency,guaranteeing safety and providing information service for perceiving the environment and providing prewarning timely.It is also the application of 5G technology in traffic.Therefore,it is of great significance for the development of vehicular networking communication system to establish a channel model that considers actual communication environment.By focusing on the vehicle-to-vehicle(V2V)communication and considering actual time-variant trajectories,the V2V multiple-input multiple-output(MIMO)channel models relaying on moving trajectories are proposed in this paper.The time evolving channel parameters,i.e.Doppler frequencies,angels of arrival and departure,path delays,and path powers,are also analyzed detailedly.The good agreements between the simulated,theoretical and measured results verify the correctness of our proposed model,calculation of parameters and derivation of statistical properties.The main work of this paper are summarized as follows:(1)The theories of V2V channel and MIMO communication system are introduced clearly.Some typical channel models are also analyzed,i.e.determinated,analyzedand stochastical models.The geometry-based stochastic model(GBSM)is obtained for its good flexibility and fitness with actual channel by comparing different methods.This provides theoretical basis for the following research.(2)Focusing on the complexity of non-stationary V2V MIMO channel,the Taylor series is introduced to approximate parameters i.e.,trigonometric function values of angle of arrival or departure,Doppler frequency and phase.Considering the channel characteristic of relaying on various environment,the approximate expressions of above parameters for straight and curve environment are derived.Simulation results fitting well with the theoretical one verifies the correctness of approximate expressions.(3)The V2V MIMO channel models considering the trajectories of two terminals are proposed in two typical scenarios,i.e.,the straight and curve,respectively.These models contain line of Sight(Lo S)and non-line-of-sight(NLo S)propagation paths.In addition,the time evolving channel parameters,i.e.,relative distances,relative velocities,angles of arrival and departure,path delays and powers are analyzed detailedly in Lo S and NLo S paths,respectively.Simulation results fitting well with the theoretical ones verifies the correctness and multiple-scenario applicability of our proposed model.(4)The statistical properties of our proposed model in the straight and curve scenarios are analyzed,and approximated expressions of spatial-temporal correlation function,i.e.temporal correlation function(TCF)and spatial correlation function(SCF)are derived in detail.Simulation results under different V2V scenarios show that the speeds and directions of velocities affect the statistical properties,which verifies that our proposed models depend on the trajectories of two terminals.The good agreement between the simulated,theoretical and measured results verifies the applicability of our proposed model.