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Conception d'une architecture numérique configurable pour la transformée en paquets d'ondelettes discrètes : application aux transmissions numériques ultra-large bande impulsionnelles

Abstract : Impulse radio ultra-wideband communications (IR-UWB) are data transmissions in 3.6 - 10.1 GHz frequency band for application fields of very short-range wireless communications, body area networks (BAN) or high precision location. The advantage of IR-UWB is the possibility of getting a high throughput and the signals have immunity to noise and multipath. Nevertheless, the main drawback is that kind of communication requires complex and energy consuming circuits. In this research works, we propose an architectures based on wavelet packets based on the inverse discrete wavelet packet transform (IDWPT) performing as a pulse generator reducing the complexity of architectures while preserving proper performance. Similarly, the direct transform (DWPT) can be used as decoder of the pulses. We have studied the feasibility of such architectures and develop a sensor network for integration into a BAN. The architecture of the pulse generator and the decoder are based on banks of interpolation and decimation filters. These filter banks have a tree structure which is symmetrical and regular providing a flexibility. The first tests of transmissions through a Gaussian channel under MATLAB - Simulink environment for different wavelets (Haar, Db2, Db4, Coif2 and rbio1.5) show that it is possible to consider such communication based on wavelet packets. Through a Gaussian channel, all the studied wavelets have the same performances. Therefore, it is preferable to choose the smallest architecture, that based on the Haar wavelet. Since the architectures are based exclusively on interpolation and decimation filters suitable for FPGA integration considering transposed filters with a polyphase structure. The detailed implementation of wavelet-based emitters and receivers studied is presented in this manuscript and compared to the previous works. We were able to observe wavelet packets from experiments that were conducted to wide bande frequencies. In this work, the time-shift problem is also considered and resolved by proposing an specific algorithm based on the uniqueness of received packets by the receiver and corresponding to a linear combination of packets coming from transmitters. In addition, a mathematical formalization validates the algorithm and extends the method for all orthogonal and compact wavelets having the same characteristics as Daubechies wavelets.
Keywords : WSN Wavelet IR-UWB
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https://hal.univ-lorraine.fr/tel-02558339
Contributor : Thèses Ul <>
Submitted on : Wednesday, April 29, 2020 - 3:11:31 PM
Last modification on : Wednesday, May 20, 2020 - 10:35:37 AM

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  • HAL Id : tel-02558339, version 1

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Hüseyin Christophe Kizil. Conception d'une architecture numérique configurable pour la transformée en paquets d'ondelettes discrètes : application aux transmissions numériques ultra-large bande impulsionnelles. Electronique. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0265⟩. ⟨tel-02558339⟩

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