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Random BeamForming (RBF) is a practically favourable transmission scheme for multiuser multi-antenna downlink systems since it requires only partial Channel State Information (CSI) at the transmitter. Under the conventional single-cell setup, RBF is known to achieve the optimal sum-capacity scaling law as the number of users goes to infinity, thanks to the multiuser diversity based transmission scheduling that eliminates the inter-user interference. In this paper, the authors extend the study on RBF to a more practical multi-cell downlink system subject to the additional Inter-Cell Interference (ICI).
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