Analyse
Cet article présente une comparaison des modulations à grand nombre d’états, qui sont étudiées du point de vue de leur robustesse face aux phénomènes de trajets multiples. Afin d’aboutir à des résultats précis, cette étude a été menée en utilisant comme critère de qualité le taux d’erreur et non un critère indirect tel que l’ouverture de l’æil. A cette fin, une méthode d’évaluation du taux d’erreur a été développée, méthode qui se caractérise par sa souplesse et son faible coût de calcul. En particulier, elle a été appliquée à des modulations cohérentes courantes et à des modulations plus originales, à constellations hexagonales, dotées d’un bon coefficient de compacité.
Abstract
The paper presents a comparison of high level modulation techniques and of their performance during multipath fading periods. In order to provide precise results, the author led this study using the error rate as quality criterion, thus avoiding the use of one of the other indirect criteria like eye opening. To this end, an error rate evaluation method was developped. The flexibility and low computing cost of this method allowed us to investigate current coherent modulation techniques and also, more original techniques with low « packing coefficient » such as hexagonal constellations.
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Lévy, A.J. Performances en probabilité d’erreur des modulations à grand nombre d’états en période d’évanouissements sélectifs. Ann. Telecommun. 40, 617–625 (1985). https://doi.org/10.1007/BF02997457
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DOI: https://doi.org/10.1007/BF02997457
Mots clés
- Propagation onde électromagnétique
- Evanouissement sélectif
- Modulation m-aire
- Probabilité erreur
- Etude comparative
- Brouillage intersymbole
- Signal analytique
- Approximation
- Modulation cohérente
- Signature
- Transmission numérique