Résumé
Les performances des systèmesMimo dépendent des propriétés du canal de propagation. Les modèles de canal de propagationMimo doivent donc traduirent fidèlement ces propriétés. Il existe plusieurs familles de modèles dont celles reposant sur l’utilisation de paramètres statistiques du second ordre. Ces modèles sont rarement comparés dans un même environnement de propagation. Partant de ce constat, nous proposons dans cet article une comparaison des différents modèles dans deux environnements: « indoor » et « outdoor ». Après avoir introduit le principe des systèmesMimo et leur représentation mathématique, nous présentons les modèles utilisés. Les paramètres statistiques nécessaires à la modélisation ont été déterminés par la caractérisation expérimentale des deux environnements. Six modèles sont confrontés aux mesures à partir de la distribution de l’enveloppe des coefficients du canal et de la capacité. Leur capacité à traduire le degré de corrélation dans le canal est analysée et permet d’identifier les plus pertinents.
Abstract
Performances ofMimo systems are dependant on the propagation channel properties. These properties must be correctly introduced in theMimo channel propagation models. Several model families exist. We will particularly investigate those relying on the use of second order statistic parameters. No comparison of these models was found in a same propagation environment. As a result, this paper deals with a comparison of six different stochastic models in “indoor” and “outdoor” environments. The principle and the mathematical representation ofMimo systems are introduced. Then, we present the different models considered. The statistical parameters used in the models are computed using an experimental characterization of the two environments. The six models are then compared to measurements using the channel coefficient envelope distribution and the channel capacity. The ability of the models to express the correlation level in the channel is analysed and discussed.
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Pardonche, JF., Berbineau, M. & Seguinot, C. Présentation de quelques modèles stochastiques de canal MIMO et comparaison expérimentale. Ann. Télécommun. 60, 649–680 (2005). https://doi.org/10.1007/BF03219941
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DOI: https://doi.org/10.1007/BF03219941
Mots clés
- Radiocommunication
- Canal transmission
- Modèle stochastique
- Corrélation spatiale
- Canal radio-électrique
- Étude comparative
- Capacité canal
- Matrice corrélation
- Transmission multicanal