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Simultaneous Diagonalization: On the DoF Region of the K-user MIMO Multi-way Relay Channel

The K-user MIMO Y-channel consisting of K users which want to exchange messages among each other via a common relay node is studied in this paper. A transmission strategy based on channel diagonalization using zero-forcing beam-forming is proposed. This strategy is then combined with signal-space alignment for network-coding, and the achievable degrees-of-freedom region is derived. A new degrees-of-freedom outer bound is also derived and it is shown that the proposed strategy achieves this outer bound if the users have more antennas than the relay.

preprint2014arXivOpen access
Anas ChaabanKarlheinz OchsAydin Sezgin
math.ITInformation Theory
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Anas ChaabanKarlheinz OchsAydin Sezgin

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