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In this paper we propose the multi-user MIMO (MU-MIMO) with the fixed relay station (RS) transmissions scheme where the base station (BS) and the fixed RS are equipped with multiple antennas and the multiple users are equipped with a single antenna. Since the MU-MIMO can improve the sum capacity significantly by transmitting the data streams to multiple users simultaneously without much link gain...
In this paper, we consider the three-hop MIMO relaying systems, based on the amplify-and-forward (AF) protocol, where there are two relay nodes both of which are equipped with multiple antennas, over Gaussian broadcast channels. We also consider that the base station (BS) broadcasts the signals to multiple distributed users via two relay nodes, that is, three hops, using a zero-forcing dirty paper...
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