Abstract
ABSTRACTMultiuser diversity beamforming (MDB) is investigated for downlink channels of multiuser multiple input multiple output (MIMO) systems. Since the use of multiple beams simultaneously results in a poor performance of MDB when the number of users is not sufficiently large, the use of single‐beam at a time is considered to avoid performance degradation due to the interference from other beams. Furthermore, in order to share a common precoder by multiple users, modulation division multiplexing (MDM) with a higher order modulation for MDB is discussed. Performance criteria for precoder and user selection are derived under the assumption that the maximum likelihood (ML) detector is used. Copyright © 2011 John Wiley & Sons, Ltd.
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