This article is part of the series Novel Techniques for Analysis and Design of Cross-Layer Optimized Wireless Sensor Networks.

Open Access Research Article

An Energy-Efficient Adaptive Modulation Suitable for Wireless Sensor Networks with SER and Throughput Constraints

JJoaquínEscudero Garzás*, CarlosBousoño Calzón and AnaGarcía Armada

Author Affiliations

Department of Signal Theory and Communications, University Carlos III of Madrid, Avda de la Universidad 30, Leganés,Madrid 28911, Spain

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EURASIP Journal on Wireless Communications and Networking 2007, 2007:041401 doi:10.1155/2007/41401


The electronic version of this article is the complete one and can be found online at: http://jwcn.eurasipjournals.com/content/2007/1/041401


Received:16 October 2006
Revisions received:14 March 2007
Accepted:6 April 2007
Published:17 May 2007

© 2007 Garzás 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.

We consider the problem of minimizing transmission energy in wireless sensor networks by taking into account that every sensor may require a different bit rate and reliability according to its particular application. We propose a cross-layer approach to tackle such a minimization in centralized networks for the total transmission energy consumption of the network: in the physical layer, for each sensor the sink estimates the channel gain and adaptively selects a modulation scheme; in the MAC layer, each sensor is correspondingly assigned a number of time slots. The modulation level and the number of allocated time slots for every sensor are constrained to attain their applications bit rates in a global energy-efficient manner. The signal-to-noise ratio gap approximation is used in our exposition in order to jointly handle required bit rates, transmission energies, and symbol error rates.

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