Development of multi-link geometry-based MIMO channel model

Abstract

Forthcoming wireless communication systems need larger capacity. MIMO systems are already an answer that enables to achieve large increase to the link capacity. However, a wide and precise knowledge of the radio propagation channel is required in order to exploit the many benefits and capabilities of MIMO systems. In this master‟s thesis a multi-link geometry-based MIMO channel model was developed. This work analyses the effect of common clusters on multi-link MIMO capacity and inter-link correlation based on simulation studies. Furthermore, the basics on radio wave propagation and MIMO systems as well as a review on existing MIMO channel models are also provided. Finally simulation results revealed that, in general, common clusters increase the inter-link correlation, and so the ML-MIMO capacity decrease. But sometimes cluster geometry together with array geometry fully determines the MIMO system performance independently of the significance of common clusters. In addition, it was shown how often the overall system performance is degraded. Finally, it was also investigated that a common cluster which is really significant for only one link is not in fact a common cluster.