Compromis efficacité énergétique et efficacité spectrale pour les objets communicants autonomes

Abstract : Technological advances have led to the develop- ment of wireless sensor applications. These sensors are generally deployed with reduced energy resources where replacing a battery can be costly. Energy ef- ficiency is an important constraint to ensure a high level of autonomy. The current trend towards high- throughput applications requires not only high spectral efficiency but also reduced energy consumption. It is therefore essential to study the trade-off between spec- tral efficiency and energy efficiency for wireless sensor networks (WSNs). In this thesis we concentrate on the different techniques adopted at the level of the phys- ical layer. At first, the various aspects characterizing the WSNs are introduced. Then, the efforts made to optimize the conservation of energy in these networks are summarized while highlighting the link between the energy consumption and the spectral efficiency. Then, different energy models are introduced and classified in order to study the evolution of the consumed energy as a function of the spectral efficiency. Secondly, we focus on the choice of modulation in order to find the optimal scheme that minimizes energy. We then stud- ied the tradeoff between energy and spectral efficiency, taking into account the constraints imposed by the sys- tem. Finally, we are interested in coding strategy and error control protocol to study their impact on the en- ergy efficiency and spectral efficiency tradeoff.
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Randa Jaouadi. Compromis efficacité énergétique et efficacité spectrale pour les objets communicants autonomes. Electronique. UNIVERSITE DE NANTES, 2017. Français. ⟨tel-01649368⟩

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