Radio Propagation Characteristics Of MIMO Channel

This thesis describes MIMO channel characteristics under different radio propagation environments using measurements and simulations in full 3 dimensions ray-tracing. These characteristics include received power, angle spread, and RMS time delay spread at different antenna elements. The assumption of independence of correlation at both sides of transmitter and receivers is verified.The measurements and simulations are performed in real labs. Before the simulations, the size, structures and layout of labs are determined, specially, including the permittivities of materials in labs. The reflection and transmission coefficients of several materials at 5.8 GHz are measured. They are wire glass, wooden door and plasterboard. The permittivities are obtained from the coefficients using the time gating that can eliminate the influences from environments. As far as author抯knowledge, the permittivity of wire glass is the first time determined. The measured permittivities are used in relative simulations.Lots of measurements and simulations have been performed at 2.25GHz, 5.8GHz and 60GHz. Several comparisons between the measurements and simulations are performed to verify the simulations. The comparisons are from three aspects: (1) Power delay profile. (2) Received power. (3) RMS delay spread.After verifying the reliable of simulations, a lot of simulations of MIMO channels characteristics have been done in the same labs with changing the antenna positions, polarizations, orientations of transmitters and receivers. These characteristics relative with sampling time, interval of antenna elements, propagation distance, polarizations, the number of reflections and diffractions taken into account in simulations, and so on.The propagation characteristics at different frequencies are simulated and compared in same labs. The comparisons include power coverage in the whole floor, RMS delay spread, angle spread. The total number of rays, power of rays, delay time, angle of arrival and departure are analyzed as well.