Authors: Said El Abdellaoui; Mérouane Debbah; Youssef Fakhri; Driss Aboutajdine
Addresses: LRIT Laboratory Associate Unit to CNRST (URAC 29), Faculty of Sciences, Mohammed V-Agdal University, 4 Avenue Ibn Battouta, B.P 1014 RP, Rabat, Morocco ' Alcatel-Lucent Chair on Flexible Radio, SUPELEC Plateau de Moulon 3, rue Joliot-Curie, Bureau 5-24 91192, Gif-sur-Yvette Cedex, France ' LARIT Laboratory, équipe Réseaux et Télécommunications, Faculty of Sciences, University Ibn Tofail, B.P 133, Kénitra 14 000, Morocco ' LRIT Laboratory Associate Unit to CNRST (URAC 29), Faculty of Sciences, Mohammed V-Agdal University, 4 Avenue Ibn Battouta B.P 1014 RP, Rabat, Morocco
Abstract: Energy in wireless sensor networks is a scarce resource, therefore an energy-efficient mechanism is required to increase the network lifetime. In this paper, we study the problem of optimal power allocation, taking into account the estimation of the total signal-to-noise ratio at the fusion centre (FC). We consider that nodes transmit their data to the fusion centre over quasi-static Rayleigh fading channels. In order to analyse our approach, we first investigate the orthogonal channel case and then the non-orthogonal one introducing a virtual MISO framework communication scheme. We consider in both cases that the nodes have channel state information. Simulations show that the new algorithm introduced provides a network extension lifetime of more than 80% in comparison with other traditional methods.
Keywords: network lifetime; cooperative communication; virtual MISO; QSRC; convex optimisation; energy constraints; wireless sensor networks; WSNs; wireless networks; energy efficiency; power allocation; simulation.
International Journal of Sensor Networks, 2013 Vol.13 No.1, pp.44 - 56
Received: 02 Dec 2011
Accepted: 30 Nov 2012
Published online: 19 Mar 2013 *