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A new detection scheme for multiuser multiple-input multiple-output (MIMO)systems is analytically presented. In particular, the transmitting users arebeing categorized in two distinct priority service groups, while theycommunicate directly with a multi-antenna receiver. The linear zero-forcingscheme is applied in two consecutive detection stages upon the signalreception. In the first stage, the signals of one service group are detected,followed by the second stage including the corresponding detection of theremaining signals. An appropriate switching scheme based on specifictransmission quality requirements is utilized prior to the detection so as toallocate the signals of a given service group to the suitable detection stage.The objective is the enhancement of the reception quality for both servicegroups. The proposed approach can be implemented directly in cognitive radiocommunication assigning the secondary users to the appropriate service group.The exact outage probability of the considered system is derived in closedform. The special case of massive MIMO is further studied yielding some usefulengineering outcomes; the effective channel coherence time and a certainoptimality condition defining both the transmission quality and effectivenumber of independent transmissions.

All Cognitive MIMO: A New Multiuser Detection Approach with Different Priorities