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Algorithmes et architectures de récepteurs pour les systèmes multiporteuses par paquets d'ondelettes.

Abstract : The aim of this PhD thesis is to investigate the usefulness of the wavelet theory for multicarrier modulation. An orthogonal base of fonctions could be built by the use of wavelet's packets and filter Banks. Applied to a multicarrier communication system, this base reduces the sensitivity to the interferences introduced by the channel. This multicarrier modulation is called DWMT (Discrete Wavelet MultiTone). Its advantages and its disadvantages are specified and compared to the multicarrier currently used for wireless or wired high-data rate transmissions : the OFDM (Orthogonal Frequency Multiplexing Division) modulation. First, the sensitivity of DWMT modulation to narrow-band interference is considered. This modulation allows the use of waveforms which have a significant attenuation of their sidelobes and then are more robust to narrow-band interference. The simulation results show that multicarrier modulation using wavelet packet reduces the disturbances of a narrowband interference. For a multipath transmission, it is mainly the use of a cyclic prefix which gives to modulation OFDM interesting results in terra of TEB. DWMT modulation outperforms OFDM modulation without cyclic prefix.
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Submitted on : Monday, January 14, 2008 - 5:39:06 PM
Last modification on : Friday, November 6, 2020 - 3:51:48 AM
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  • HAL Id : tel-00204540, version 1

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Matthieu Gautier. Algorithmes et architectures de récepteurs pour les systèmes multiporteuses par paquets d'ondelettes.. Traitement du signal et de l'image [eess.SP]. Institut National Polytechnique de Grenoble - INPG, 2006. Français. ⟨tel-00204540⟩

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