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The Scientific World Journal
Volume 2014, Article ID 650653, 14 pages
http://dx.doi.org/10.1155/2014/650653
Research Article

Network Efficient Power Control for Wireless Communication Systems

Facultad de Ciencias, Universidad Autónoma de San Luis Potosi, Avenue Salvador Nava s/n, Zona Universitaria, 78290 San Luis Potosi, SLP, Mexico

Received 15 August 2013; Accepted 31 October 2013; Published 9 February 2014

Academic Editors: A. Bogliolo and D. S. Budimir

Copyright © 2014 Daniel U. Campos-Delgado 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

We introduce a two-loop power control that allows an efficient use of the overall power resources for commercial wireless networks based on cross-layer optimization. This approach maximizes the network’s utility in the outer-loop as a function of the averaged signal to interference-plus-noise ratio (SINR) by considering adaptively the changes in the network characteristics. For this purpose, the concavity property of the utility function was verified with respect to the SINR, and an iterative search was proposed with guaranteed convergence. In addition, the outer-loop is in charge of selecting the detector that minimizes the overall power consumption (transmission and detection). Next the inner-loop implements a feedback power control in order to achieve the optimal SINR in the transmissions despite channel variations and roundtrip delays. In our proposal, the utility maximization process and detector selection and feedback power control are decoupled problems, and as a result, these strategies are implemented at two different time scales in the two-loop framework. Simulation results show that substantial utility gains may be achieved by improving the power management in the wireless network.