Utility-Based Scheduling and Fixed Switching Beamforming for User Satisfaction Improvement in OFDMA Systems

Konferenz: European Wireless 2014 - 20th European Wireless Conference
14.05.2014 - 16.05.2014 in Barcelona, Spain

Tagungsband: European Wireless 2014

Seiten: 6Sprache: EnglischTyp: PDF

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Rodrigues, Emanuel B.; Neto, Hugo C.; Maciel, Tarcisio F.; Lima, Rafael M.; Cavalcanti, Rodrigo P. (Wireless Telecommunications Research Group (GTEL), Federal University of Ceara (UFC), Fortaleza, Brazil)

In this paper, we consider the problem of improving the percentage of satisfied users in the downlink of an Orthogonal Frequency Division Multiple Access (OFDMA) system that provides non-real time services. Therefore, we propose an utilitybased scheduling algorithm that uses a sigmoidal utility function combined with Fixed Switching Beamforming (FSB) to exploit several kinds of diversity, such as time, frequency, space and multi-user, in order to achieve the pursued objective. System-level simulation results demonstrate that there is an optimal number of spatial beams to be used by FSB, and that the proposed joint scheduling and beamforming provides higher user satisfaction than other classical techniques found in the literature.