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Panorama des études sur les trajets multiples

An overview on multipath studies

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L’existence d’évanouissements rapides et très profonds sur les liaisons hertziennes en visibilité est connue depuis les années 40. On devait bientôt les attribuer à une propagation par trajets multiples et mettre en évidence leur propriété de sélectivité en fréquence. Depuis la fin de la dernière guerre, le phénomène n’a jamais vraiment cessé d’être étudié; ces études ont d’ailleurs connu un vif regain d’intérêt ces dernières années lorsqu’on s’est aperçu qu’il constituait la principale menace pour la qualité des liaisons numériques à grand débit. Cet article présente une revue critique des travaux publiés sur la propagation par trajets multiples en s’efforçant de souligner les lacunes qui subsistent et les axes d’études qui semblent les plus prometteurs. Cela a pour but de replacer les études du CNET, décrites dans les autres articles de ce numéro, dans un cadre plus général.

Abstract

Rapid and deep fadings affecting line of sight micro-wave links have been known since the fourties. They were soon attributed to multiple path propagation and their frequency selectivity was demonstrated. Since the end of second world war, this phenomenon has been a constant subject of work; it has even gained new interest in the last years, when it appeared it was the main cause of perturbations in high rate digital line of sight links. In this paper, we give a critical review of published work on multiple path propagation, trying to point out subsisting gaps in our knowledge, and studies which appear more promising. We thus intend to place CNET studies, described in other papers of this issue, in a more general perspective.

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  1. CNET/PAB/RPE, 38-40, rue du Général Leclerc, 92131, Issy-les-Moulineaux

    Michel Sylvain

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  1. Michel Sylvain
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Sylvain, M. Panorama des études sur les trajets multiples. Ann. Telecommun. 40, 547–564 (1985). https://doi.org/10.1007/BF02997451

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