User Admission in MIMO Interference Alignment Networks

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In this paper, the authors consider an interference channel where a set of primary active users are cooperating through interference alignment over a constant multiple-input-multiple-output channel while a set of secondary users desire access to the channel. They present the conditions under which a secondary user can be admitted to the network. For the admitted users, they derive several beamforming designs maximizing approximately the secondary users' sum-rate based on the number of the secondary users, the number of antennas at the secondary users and the total number of streams in the network of active users.