RATE-OPTIMAL MULTIUSER SCHEDULING WITH REDUCED FEEDBACK LOAD AND ANALYSIS OF DELAY EFFECTS (ThuPmOR3)

Author(s) : Vegard Hassel (Norwegian University of Science and Technology (NTNU), Norway) Mohamed-Slim Alouini (University of Minnesota, United States) Geir Egil Řien (Norwegian University of Science and Technology (NTNU), Norway) David Gesbert (Eurecom, France)

Abstract : In this paper we propose a multiuser scheduling algorithm that has the maximum average system spectral efficiency, but obtains a significant reduction in feedback load compared to full feedback by using a feedback threshold. An expression for the threshold value that minimizes the feedback load is found. Novel closed-form expressions are also found for the system spectral efficiency when using M-ary quadrature amplitude modulation. Finally, we analyze the impact of scheduling delay and outdated channel estimates.

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