Rozhnovskaya I. Electromagnetic modeling of MIMO-channel with account of the polarization properties of antennas

The object is the electrodynamics modeling of multibeam radio channel. The subject is the MIMO-channel with account of the polarization properties of antennas in the form of combined helical antenna and the antenna array on its basis. Research methods: methods of the matrix theory, methods of the signal graph theory, the induced EMF method which includes methods of differential and integral calculus, methods of the linear and vector algebra theory, methods of the mathematical modeling, simulation on the computer. Theoretical and practical results: the electromagnetic model of MIMO-channel, which takes into account the partial mismatch of input circuits from the side of the signal transmitter and receiver and mathematical model of radio link transmission coefficient in an analytical form on the basis of electromagnetic approach, is proposed. The calculation method of antennas mutual resistance, which takes into account their mutual coupling, based on the analytically geometrical analysis of the elementary radiators field with the help of the EMF method is developed. Analytical expressions for determination of the radiation field of antenna element in the form of combined helical antenna and the antenna array on its basis are given. Thesis results allow to estimate numerically the real radio channel capacity; to carry out the choice of optimum structural features of the antenna systems, optimum type of polarization of radiation, optimum type of antenna pattern on the stage of the МIМO-system design.