Abstract
We study the multiuser diversity in both multiple-access channel (MAC) and broadcast channel (BC) in multiple-input multiple-output (MIMO) systems, where more than one users are communicating with the base station simultaneously. We consider multi-user scheduling with linear receivers for uplink MIMO MAC and linear precoders for downlink MIMO BC. In each time slot, a group of users is selected for either transmission or reception. A selection criterion is presented to optimise the detection signal-to-noise ratio. We show that the linear processings achieve asymptotically the same detection signal-to-noise ratio for downlink and uplink. This makes it convenient to use a single scheduling algorithm in both downlink and uplink. Furthermore, we present a performance analysis of the proposed scheduling algorithm. Both the analysis and simulations have shown that the scheduling algorithm can provide a significant gain in capacity and error performance for both MIMO BC and MIMO MAC with linear processing.
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