Abstract
Under the assumption that each node has delayed channel state information at transmitter (D-CSIT), this letter studies the achievable degrees of freedom (DOF) for $K$ -user multiple-input-multiple-output (MIMO) Y channel in frequency division duplex (FDD) systems, where each user exchanges messages with other $K-1$ users simultaneously via an intermediate relay. We propose a new retrospective network coding alignment (RNCA) scheme and derive the closed-form expression for achievable DOF.
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