Open Access

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

  • J. Joaquín Escudero Garzás1Email author,
  • Carlos Bousoño Calzón1 and
  • Ana García Armada1
EURASIP Journal on Wireless Communications and Networking20072007:041401

DOI: 10.1155/2007/41401

Received: 16 October 2006

Accepted: 6 April 2007

Published: 17 May 2007

Abstract

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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Authors’ Affiliations

(1)
Department of Signal Theory and Communications, University Carlos III of Madrid

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Copyright

© J. Joaquín Escudero Garzás et al. 2007

This article is published under license to BioMed Central Ltd. 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.