Abstract
In spectrum sharing environments of cognitive radio (CR), secondary users are permitted to share the primary user's spectrum only if limited interference to the primary user can be guaranteed. On the other hand, when multiple CR users share the same channel at one time, the total throughput of the CR networks can be maximized by allocating the common radio resource to the CR users with the best channel quality and the multiuser diversity gain can be obtained. In this paper we propose a fast CR user selection algorithm with low complexity and the multiuser diversity gain are analyzed. From the simulation results, this algorithm not only decreases the computational complexity of the scheduling algorithm but also retains large capability of the MIMO CR system.
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