[Propagation des ondes (MIMO) dans un tunnel—une étude théorique et expérimentale]
Les techniques multi-antennes en émission et en réception (MIMO) consistent à utiliser la propagation par trajets multiples de manière à transformer le canal global en un certain nombre de canaux virtuels indépendants les uns des autres. Cependant, si la liaison est effectuée dans un long tunnel, le nombre d'objets réfléchissants distribués entre l'émetteur et le récepteur ou au voisinage de ceux-ci, risque souvent d'être faible. De plus, compte tenu des dimensions transversales du tunnel vis-à-vis de la longueur d'onde, le tunnel se comportera comme un guide d'ondes à pertes surdimensionné. Dans ce cas, le concept de diversité spatiale doit être remplacé par celui de diversité modale. L'objet de cette présentation est de montrer, en s'appuyant sur une démarche théorique et expérimentale, les conditions dans lesquelles les techniques MIMO permettront d'augmenter la capacité ergodique du canal.
MIMO (Multiple-Input Multiple-Output) techniques, based on multiple antennas at both the transmitting and receiving sites, use multipath propagation to transform the overall channel into numerous independent virtual channels. However, when the link is made in a long tunnel, the number of reflecting objects between, or near, the transmitter and the receiver is often quite low. In addition, due to the large transverse dimensions of the tunnel compared to the wavelength, the tunnel acts like a lossy oversized waveguide. In such situations, the concept of spatial diversity must be replaced by the concept of modal diversity. This article uses theoretical and experimental results to show the conditions in which MIMO techniques allow the ergodic capacity of the channel to be increased.
Mot clés : MIMO, Canal de propagation, Tunnel
Martine Lienard 1 ; Pierre Degauque 1 ; Jose Maria Molina-Garcia-Pardo 2
@article{CRPHYS_2006__7_7_726_0,
author = {Martine Lienard and Pierre Degauque and Jose Maria Molina-Garcia-Pardo},
title = {Wave propagation in tunnels in a {MIMO} context{\textemdash}a theoretical and experimental study},
journal = {Comptes Rendus. Physique},
pages = {726--734},
publisher = {Elsevier},
volume = {7},
number = {7},
year = {2006},
doi = {10.1016/j.crhy.2006.07.005},
language = {en},
}
TY - JOUR AU - Martine Lienard AU - Pierre Degauque AU - Jose Maria Molina-Garcia-Pardo TI - Wave propagation in tunnels in a MIMO context—a theoretical and experimental study JO - Comptes Rendus. Physique PY - 2006 SP - 726 EP - 734 VL - 7 IS - 7 PB - Elsevier DO - 10.1016/j.crhy.2006.07.005 LA - en ID - CRPHYS_2006__7_7_726_0 ER -
%0 Journal Article %A Martine Lienard %A Pierre Degauque %A Jose Maria Molina-Garcia-Pardo %T Wave propagation in tunnels in a MIMO context—a theoretical and experimental study %J Comptes Rendus. Physique %D 2006 %P 726-734 %V 7 %N 7 %I Elsevier %R 10.1016/j.crhy.2006.07.005 %G en %F CRPHYS_2006__7_7_726_0
Martine Lienard; Pierre Degauque; Jose Maria Molina-Garcia-Pardo. Wave propagation in tunnels in a MIMO context—a theoretical and experimental study. Comptes Rendus. Physique, Volume 7 (2006) no. 7, pp. 726-734. doi : 10.1016/j.crhy.2006.07.005. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2006.07.005/
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