Smart geometrical antenna design exploiting the LOS component to enhance a MIMO System based on Rayleigh-fading in indoor scenarios

In this paper we propose a special antenna design for indoor applications which enables superior transmission properties within a designated and fixed area due to a line of sight (LOS) based MIMO antenna configuration. In the rest of the room the MIMO-system relies on the multi-path signal from the Rayleigh channel background. We derive a simple design recipe to achieve a nearly perfect antenna configuration for a LOS-based MIMO-system and apply this to an indoor application example. Assuming a typical office scenario, capacity issues are discussed and a very simple transmission system is simulated. In the designated area a very simple transmission system delivers nearly the maximum data rate and hence, the application of successive interference (SIC) cancellation is not necessary here. For the rest of the room SIC yields a significant improvement. At last we propose a more symmetrical antenna structure, which reduces the angular dependence of the transmission quality.