Performance of successive broadcasting scheme for a multiuser dowlink MIMO system operating under mutual coupling conditions

This paper reports the performance of a downlink of a multiuser MIMO system which uses a successive beamforming broadcasting scheme. The investigations take into account the effects of mutual coupling that is present in receiving antennas. It is shown that that the mutual coupling changes the received signals statistic properties and impacts the co-channel interference component. The overall mutual coupling effect on the system performance as measured in terms of sum rate capacity depends on the inter-element spacing. Simulation results show that the mutual coupling increases the sum rate capacity when an inter-antenna spacing is smaller than 0.5 wavelength.