The near-far problem and the correlations in a MIMO channel are two major obstacles in the way of widely implementing Space Division Multiple Access (SDMA) systems. In this paper we investigate the effect of distributing the basestation antennas and the reduction of intra-user correlations on the performance of a MIMO-OFDM system in which a basestation, composed of distributed antenna arrays, is communicating (downlink transmission) with several single antenna mobile users. The arrays are located at different sites in a Ricean-Lognormal channel environment. Very significant improvement in system performance is achieved due to the improved spatial properties of the MIMO channel and due to the reduction of channel matrix correlations.
['Nadem Hussein Dawod', 'Roshdy H. M. Hafez', 'Ian Marsland']
A Multiuser Zeroforcing System with Reduced Near-Far Problem and MIMO Channel Correlations