Research On Spherical Wave MIMO Channel Modeling Based On Electromagnetic Theory

The performance of the fifth generation(5G)mobile communication system with massive multiple-input-multiple-output(MIMO),millimeter wave and other technologies as the core has basically met expectations.Researchers have begun to focus on the development of sixth generation(6G)mobile communication systems.Wireless channel modeling is the prerequisite of any communication system,so it is of great significance for the development and research of technologies such as massive MIMO.This paper introduces the development history of wireless communication and introduces the main characteristics of wireless communication systems.The classification compares several methods of wireless channel modeling,illustrating their respective advantages and disadvantages,then two wireless channel models are proposed.The main research work of this paper is as follows.A correlation-based massive multiple-input multiple-output channel impulse response matrix(CIRM)model is proposed.In this model,CIRM can be modeled as the coupling sum between the steering vectors of the base station and the enginbase of the mobile terminal.Nakagami distribution is used to simulate the fading of the coupling between the steering vectors and the enginbase.To validate the model,extensive measurements were implemented,and the results showed that the new model fits the measurements better than other CBSMs.In addition,the proposed model can provide a trade-off between accuracy and complexity,which can be used in the design of future communication systems of massive MIMO.A new physical channel model is proposed,which can be used to study the interaction between antennas and propagation channel in MIMO system.In order to describe the propagation of signals more accurately,this paper uses the form of spherical waves to model the channel matrix.The spherical vector wave coefficient expansion of electromagnetic field,antenna scattering matrix and non-stationary modeling are used to derive the extended form of the channel matrix.The channel matrix that strips the influence of the antenna is introduced,and its covariance statistic is expressed as a function of the bilateral power angle spectrum of the common-polarization component and the cross-polarization component.This model can help study the interaction between antenna and channel and can be used to study the design of antennas in a given propagation channel.