Performance of MIMO capacity using angle domain processing realized by Butler matrix

This paper aims to present the benefit of using a Butler matrix for MIMO systems employing angle domain processing instead of array domain processing. By applying Butler matrix, the concept of angle domain processing can be realized in practice and it still takes a full advantage of multiple antennas. The different scenarios of a fading MIMO environments are examined. The simulation results on channel capacity indicate that the angle domain processing with Butler matrix outperforms the conventional array domain processing. Also the proposed system is attractive to MIMO implementation due to its low cost and complexity.