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The authors consider optimal beamforming and user admission in cellular secondary networks where radio access to the licensed spectrum is granted under the premise that the interference level created in the primary network falls below a predefined threshold and Quality of Service (QoS) demands of the Secondary Users (SUs) need to be fulfilled. In scenarios where the interference constraints are restrictive, or the number of users in the primary network is large, costly user admission generally becomes unavoidable. They propose an iterative transmit beamforming and power allocation technique for interference limited cognitive networks in which a computationally efficient user selection procedure naturally integrates. Their iterative scheme is based on the uplink-downlink duality property of the network.
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