It is well-known that user selection not only leads to multiuser diversity but also to decreased suboptimality of simple beamforming (BF) techniques compared to optimal Dirty Paper
Coding (DPC) approaches in the Broadcast Channel (BC), otherwise called the multi-user (MU) downlink, in a cell with a base station and mobile terminals equipped with multiple
antennas (MU-MIMO). User selection by exhaustive search can be simplified to greedy approaches, in which one user gets added at a time. In this paper, we review an approximate
criterion for MISO BF-style selection. For a sufficient amount of users, multiple receive antennas do not lead to increased spatial multiplexing, but we indicate how they affect
the high SNR rate offset. The resulting added diversity can be exploited at the cost of more involved user selection and transceiver design. We thus propose a novel receiver design
for BF-style MU-MIMO stream selection.
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