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In this paper, we consider user selection algorithms for Multi-user MIMO systems with perfect or partial channel state information at the transmitter (CSIT). A novel user selection algorithm based on chordal distance is proposed. The basic principle is to serve the user subset in which one is approximately orthogonal to the others. Since the chordal distance relies only on the channel direction information,...
Differential unitary space-frequency modulation reduces the complexity of multiple-input multiple-output-orthogonal frequency division multiplexing (MIMO-OFDM) systems significantly. But the conventional single symbol differential detection (SSDD) results in a high error floor over a severe multipath spreading channel. To overcome this limitation, a multiple symbol differential stack algorithm is...
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