Dynamic User Scheduling in Non-Orthogonal Multiuser MIMO-OFDM

We propose a multiuser scheduler based on signal-to-interference-and-noise ratio (SINR) constraints using a non-orthogonal space-division multiple access (SDMA) MIMO-OFDM. To mitigate the complexity needed for computing the linear transceiver filters with a possible number of non-feasible users, we 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, we obtain thresholds that fulfill the equivalent SINR constraints for a different number of users. In this paper, vSNR thresholds are utilized to develop a simple multiuser scheduling routine. Finally, a performance comparison to the unscheduled case will be demonstrated.