TAILIEUCHUNG - Báo cáo hóa học: " Research Article An Energy-Efficient Adaptive Modulation Suitable for Wireless Sensor Networks with SER and Throughput Constraints"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article An Energy-Efficient Adaptive Modulation Suitable for Wireless Sensor Networks with SER and Throughput Constraints | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID41401 7 pages doi 2007 41401 Research Article An Energy-Efficient Adaptive Modulation Suitable for Wireless Sensor Networks with SER and Throughput Constraints J. Joaquin Escudero Garzas Carlos Bousono Calzon and Ana García Armada Department of Signal Theory and Communications University Carlos III of Madrid Avda de la Universidad 30 28911 Leganes Madrid Spain Received 16 October 2006 Revised 14 March 2007 Accepted 6 April 2007 Recommended by Mischa Dohler 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. Copyright 2007 J. Joaquin Escudero Garzas 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. 1. INTRODUCTION Wireless sensor networks are susceptible to many different applications in diverse fields such as areas of industry and commerce . environment monitoring and control home automation and intelligent buildings . security lighting air .

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