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Architectures numériques adaptatives pour les systèmes de transmission sans fils fiables

Abstract : The thesis work presented in this manuscript focuses on the development of a new transmission architecture specifically dedicated to wireless sensor networks and adapted to the particular characteristics of the later. The approach, based on impulse radio techniques for wideband transmission, is developed according to two main research aspects: functional and hardware. The functional aspect aims at defining the characteristics of the transmitted signal as well as the associated processing algorithms (modulation and demodulation). More broadly, it comes to define the functional architecture of the transmission chain, according to two different operating modes: mono- and multi-user. The proposed approach for transmitting pulse signals is based on the use of the discrete wavelet packet transform (DWPT) at the receiver and the inverse transform (IDWPT) at the transmitter. The orthogonal nature of the wavelets makes it possible, without needing a complex MAC layer, to make multi-user communications, either simultaneous or not, over a wideband channel, thanks to the strong discrimination between the transmitted pulses. The second aspect relates to the development of hardware architectures allowing the implementation of the processing algorithms developed in the functional part. The search for high performance (high ratio between processing speed and hardware cost) and flexibility (configurability, extensibility) is particularly important in the functionality related to the discrete wavelet packet transform which constitutes the critical core of the transmission chain. Massive and generic parallelization techniques are developed and implemented to achieve the required levels of performance and flexibility. Validation was carried out using respectively Simulink/Matlab (MathWorks) modeling and simulation for the functional aspects, and VHDL modeling (at the Register Transfer Level -- RTL) and FPGA implementations for the hardware aspects.
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Submitted on : Monday, May 13, 2019 - 2:17:31 PM
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  • HAL Id : tel-02127421, version 1



Mouhamad Chehaitly. Architectures numériques adaptatives pour les systèmes de transmission sans fils fiables. Sciences de l'ingénieur [physics]. Université de Lorraine; Université libanaise, 2017. Français. ⟨NNT : 2017LORR0400⟩. ⟨tel-02127421⟩



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