Carlos Pereira

Impact of Mutual Coupling on MIMO Channel Modelling

Mutual coupling effect between antennas on MIMO (multiple input multiple output) transmission is an important factor to take into account for an accurate modelling channel when antennas are closely spaced. The aim of this paper is to present the impact of mutual coupling on MIMO channel characteristics according to several propagation contexts. To achieve this purpose an original study, which has recourse to two complementary simulation methods, is set out. The first method simulates multipath propagation channel thanks to an optimized 3D ray-tracing. The second one is derived from rigorous electromagnetic analysis based on a method of moments. It models, in near field, mutual coupling between antennas. Results illustrate this impact on MIMO channel transfer matrix.

Impact of Indoor Environment Modeling on MIMO Channel Characterization

One of the important factors for deterministic channel propagation simulator using 3D ray-tracing methods is the environment modeling. Sensitivity of results depends on its description accuracy. This paper concerns the influence of the environment description precision on MIMO channel characterization. Simulations have been performed in two unfurnished indoor environments. The first one is a floor, the second one is a hall with large dimensions. For these two cases, four description levels show effects of geometrical and electrical descriptions by studying the MIMO channel characteristic parameters like correlation and capacity. These last ones vary according to LOS and NLOS cases, antenna polarizations, spacing between antennas and number of transmitters and receivers