Research On Improved Cylindrical MIMO Wireless Channel Modeling Based On Moving Scattering Scene

As one of the indispensable social infrastructures in the world,wireless communication systems provide innovative communication services while coping with growing communication demands.Multiple Input and Multiple Output(MIMO)technology can significantly improve data throughput and link range without increasing bandwidth or transmit power.In order to accommodate higher data rates in different frequency bands,advanced systems are needed to tightly by integrating multiple antennas,researchers are increasingly interested in wireless MIMO technology for faster data transmission rates,ultra-low latency,and more energy-efficient communication systems.As a part of the key research of mobile communication,MIMO technology is also the research scope of the fifth generation wireless communication system(5G).These challenges involve new frequency bands and larger bandwidths.At the physical level,new channel propagation is required models and improved antenna designs need to introduce 5G communication technology into Vehicle-to-vehicle(V2V)communication.This paper conducts research around MIMO channel modeling in two-dimensional(2D)and three-dimensional(3D)spatial domains.For the mobile communication environment,this paper analyzes the probability density function,Doppler Shift(DS),Spatial Fading Correlation(SFC)and Power Spectral Density(PSD)which affect the performance of a MIMO multi-antenna system.The theoretical and simulation research of the wireless communication system of the scene lays a good theoretical foundation.The innovation work of this article can be divided into the following three parts:Firstly,a Gaussian Scattering Density Model(GSDM)is proposed.Assuming that the scatterers at the mobile station(MS)have a Gaussian distribution,the Angle of Arrival(AOA)and Time of Arrival(TOA)expressions of the Probability Density Function(PDF),Power Azimuth Spectrum(PAS)and Power Delay Spectrum(PDS)expressions by appropriately selecting the density of the scatterer.The standard deviation of the model is applied to the macro-cell and pico-cell environment of a single geometric model and the simulation data is compared with empirical models and data to verify the rationality of the proposed model.Secondly,for 5G macrocell mobile-to-mobile(M2M)communication scenarios,we in this article propose a 3D cylinder MIMO channel model to reflect the distribution region of interfering objects in macrocell propagation environments,where the receiver(Rx)is located in the center point of the cylinder model,while the transmitter(Tx)is outside the scattering region.In the proposed model,the received signal is constructed as a sum of the components with line-of-sight(LOS)propagations and the components reflected by the objects with different energies,i.e.,non-line-of-sight(NLOS)propagation components,which makes the model has the ability to sufficiently adaptable to a variety of 5G wireless communication scenarios.Furthermore,we investigate the statistical channel propagation properties,i.e.,spatial cross-correlation functions(CCFs)of two different propagation components,temporal autocorrelation functions(ACFs)and PSDs,for different movement directions and time instants of the Tx and Rx.Numerical analytical results of the propagation properties fit the simulation results very well,which demonstrate that the proposed 3D model is practical for characterizing the real 5G macrocell M2 M channels.Finally,in order to make the propagation characteristics of urban V2 V mobile communication systems more flexibly and accurately,a 3D dual-cylindrical geometric propagation model is proposed,in which scattering around the transmitter and receiver is modeled.The volume includes fixed and moving scatterers,a 3D parameter reference model for narrowband MIMO V2 V multipath fading channels is studied.From the reference model,the corresponding Spatio-Temporal Correlation Function(ST-CF)and Spatiotemporal Doppler Power Spectral Density(SD-PSD)of the 3D non-isotropic scattering environment is derived.By analyzing the relevant characteristic curves of the 3D spatial array,the comparison of simulation results with some classic model data shows the rationality of the proposed model,which provides a good theoretical basis for further analysis and discussion of the characteristics of MIMO multipath channels or 5G MIMO channels in the future.