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The authors propose an adaptive multiuser QoS-based scheduler based on the users' channel measurements. In order to mitigate the complexity that results from computing non-codebook based beamformers for possibly infeasible users, they propose to preselect the optimal users using a virtual Signal-to-Noise Ratio (vSNR). This is computed assuming non-interfering users and a total power constraint. Solely depending on vSNR, they obtain thresholds that fulfill the equivalent SINR constraints for a different number of users. In this paper, vSNR thresholds are utilized to develop a fast adaptive multiuser scheduling routine.
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