Study of different mechanisms providing gain in MIMO systems

In this paper, measurements are used as the experimental basis for evaluation of MIMO antenna configurations at 2.15 GHz. At the transmitting fixed station, the effects of increasing the number of channels and increasing the inter-element spacing in MIMO systems are studied. The goal of the paper is to find out how MIMO channels could be exploited better. We have performed radio channel sounder measurements using antenna arrays of directive and dual-polarized elements. Three potential MIMO environments have been included in the study. We found that increasing the distance between transmitting antenna elements or increasing the number of elements decreases eigenvalue spread and improves MIMO performance.