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Estimation de canal très sélectif en temps et en fréquence pour les systèmes OFDM

Abstract : High bit rates services focusing in the telecommunications domain is leading to an increasing interest for OFDM modulation in actual research. This technique is based on orthogonal modulating filters and doesn't need the use of an equalizer, but it requires the estimation of the channel frequency response for each transmitted symbol. Today's propagation contexts met in high bit rate mobile communications may be really tough to precisely estimate. In this document, we propose two channel estimation methods for highly frequency and time selective channels, based on the Maximum a Posteriori criteria, processing block by block the re¬ceived signal. These algorithme use a channel model based on the orthogonal decomposition of the autocorrelation matrix of the channel obtained by means of the Karhunen-Loève orthogonal ex¬pansion theorem. We also present these new techniques performance compared to classical channel estimators and the robustness of those methods to an error on the channel statistics.
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https://pastel.archives-ouvertes.fr/pastel-00001753
Contributor : Ecole Télécom Paristech <>
Submitted on : Monday, June 19, 2006 - 8:00:00 AM
Last modification on : Friday, July 31, 2020 - 10:44:03 AM
Long-term archiving on: : Thursday, September 30, 2010 - 7:21:44 PM

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  • HAL Id : pastel-00001753, version 1

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Emmanuel Jaffrot. Estimation de canal très sélectif en temps et en fréquence pour les systèmes OFDM. domain_other. Télécom ParisTech, 2000. English. ⟨pastel-00001753⟩

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