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In this paper, the authors consider the coexistence between a large number of cognitive radio users and a licensed user in order to enhance the spectrum efficiency. Zero-Forcing Beamforming (ZFB) is utilized as a downlink precoding technique that pre-cancels inter-user interference in their multiuser cognitive Multiple-Input/Multiple-Output (MIMO) system. When there is a large number of users, the system performance can be significantly increased by selecting a subset of users and a set of receive antennas for each user. In particular, to reduce the complexity, they propose a receive antenna selection method followed by multiuser selection in order to maximize the downlink throughput as well as mitigate the interference to the primary user.
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