Description: We present a novel beamforming technique
for multi-user frequency-selective indoor channels called
interference-nulling time-reversal (INTR). The beamformer is
implemented with a pre-filter designed to minimize the interuser
interference present in conventional time-reversal (TR).
Moreover, our technique relies on a large number of antennas at
the transmitter to mitigate inter-symbol interference, enabling
low computational complexity receivers. We demonstrate that
INTR outperforms previous TR techniques with respect to
average bit error rate per user and achievable sum rate. Thus,
INTR can be used for space division multiple access in no-Iine-ofsight
mm-wave massive MIMO, providing remarkable diversity
and multiplexing gains.
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