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Theses

Etude et amélioration d'un récepteur pour la norme EDGE

Abstract : The purpose, which we pursued in this work, is the improvement of the performances of the receivers intended for the system EDGE. We developed more particularly two points: The automatic recognition of modulation type in the received burst and the channel equalizer. As regards the modulation type recognition, Ericsson had already proposed a solution. We introduced another original solution, based on the observation of the basic band digital constellation. Our results indicate improved performances. The solutions at present proposed by different teams for channel equalization present correct performances in the cases of restricted mobility (some km/h). Our purpose is to improve equalizers by making them operational for superior mobilities. For that purpose, we adapted to the standard EDGE an introduced equalizer (DDFSE) there is many years (1989) for modulations of type QPSK. Our simulations indicate competitive performances in the case of a restricted mobility, which degrade quickly when this last one increases, but however less fast than for the most part of the rival methods. Still to improve the performances of the equalizer and win in mobility, we looked for additional approaches. First of all, we adapted to our receiver a frequency correction algorithm allows to facilitate the channel estimation when the mobility increases. The simulations are convincing and show that the effect of the algorithm is all the more net as the mobility is high. Another original investigated way was the channel re-estimation. Indeed, for the average and high mobilities, the variations of the canal are very fast, even on the duration of a single burst. We suggested choosing between several variants of the (CIR) bringing in the previous, current and following bursts (and either only the current burst). The simulations showed the efficiency of this method, especially for high mobilities
Keywords : Radio waves
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Theses
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https://hal.archives-ouvertes.fr/hal-00152911
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Submitted on : Friday, June 8, 2007 - 7:20:22 AM
Last modification on : Wednesday, March 23, 2022 - 3:50:22 PM

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  • HAL Id : hal-00152911, version 1

Citation

Iyad Dayoub. Etude et amélioration d'un récepteur pour la norme EDGE. Electronique. Université de Valenciennes et du Hainaut-Cambrésis, 2001. Français. ⟨NNT : 2001VALE0032⟩. ⟨hal-00152911⟩

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