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International Journal of Antennas and Propagation
Volume 2013, Article ID 730710, 9 pages
http://dx.doi.org/10.1155/2013/730710
Research Article

Power Management in Multiuser Adaptive Modulation Transmission under QoS Requirements

1University of Jordan, Amman 11942, Jordan
2Qatar Mobility Innovations Center (QMIC), Doha 210531, Qatar
3University of the Aegean, 83200 Samos, Greece
4CTTC, 08860 Barcelona, Spain

Received 25 April 2013; Accepted 25 July 2013

Academic Editor: Athanasios Kanatas

Copyright © 2013 Saud Althunibat et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A transmitter power management mechanism is presented in this paper where Multiple-Input Multiple-Output (MIMO) Multiuser Random Beamforming with Adaptive Modulation strategy is performed by the system. The objective of the proposed mechanism is quality of service (QoS) satisfaction for the scheduled user. The QoS is represented by the application demanded data rate and symbol error rate. The power outage problem is considered and a practical method to minimize the outage probability is proposed. The obtained results are encouraging as they show a great decrease in the system power budget. The multiuser system capability is also exploited to achieve larger power saving values and smaller probability of power outage by scheduling the user with the best channel characteristics at each time instant. The amount of saved power and the power outage probability are both presented through closed-form expressions. These theoretical results are compared to computer simulations, which show very good agreement in performance.