Low Complexity Opportunistic Interference Alignment in $K$-Transmitter MIMO Interference Channels

摘要

In this paper, we propose low complexity opportunistic methods forinterference alignment in $K$-transmitter MIMO interference channels byexploiting multiuser diversity. We do not assume availability of channel stateinformation (CSI) at the transmitters. Receivers are required to feed backanalog values indicating the extent to which the received interferencesubspaces are aligned. The proposed opportunistic interference alignment (OIA)achieves sum-rate comparable to conventional OIA schemes but with asignificantly reduced computational complexity.