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Caractérisation expérimentale et modélisation du canal de propagation sans fil à courte portée à 60GHz

Ghaddar, Mohamad (2012). Caractérisation expérimentale et modélisation du canal de propagation sans fil à courte portée à 60GHz. Thèse. Gatineau, Université du Québec en Outaouais, Département d'informatique et d'ingénierie, 181 p.

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Résumé

This thesis reports broadband propagation measurements and modeling results for indoor wireless local area network (WLAN) applications in the unlicensed 60 GHz band. Based on sweeping-frequency sounding technique (59.6 – 60.6 GHz), the propagation measurements are carried out in two typical indoor environments; a) non-line-of-sight (NLOS) T-shaped intersection of two long corridors at a distance range exceeding 20 meters, with and without the presence of deflecting obstacles (DOs). b) line-of-sight (LOS) rectangular conference room. On the basis of geometric ray-tracing (RT), deterministic models are derived for the considered environments. Predicted and experimental results are based on the use of directive antennas at both remote terminals in the corridors; however, an omnidirectional conical antenna is used at the remote receiving end for the conference room. The channel transfer functions (CTFs) and the power delay profiles (PDPs) obtained from the RT tool are then compared with the experimental data for each of the considered environments. An interesting agreement is achieved between the predicted and the experimental results in both frequency and time domains. Results demonstrate that mm-waves communications are very susceptible to the propagation environment compared with low frequency bands. In NLOS corridors environment, signal transmission relies mainly on the unavoidable diffraction phenomenon from the intersection corners. However, in the case of LOS conference room and unlike lower frequency bands, rays undergo third order-reflections and higher but these are not important due to the high signal absorption by walls at 60 GHz. Furthermore, an experimental characterization of the measured propagation data in the considered scenarios is reported in this thesis. The statistical parameters of the multipath propagation characteristics, such as the channel coherence bandwidth, the path loss exponent law (n), the statistics of the RMS delay spread and the shadowing, are evaluated. In the NLOS corridors under consideration, the experimental results show that NLOS mm-wave propagation characteristics are very complex where a severe path loss is recorded; however the presence of transmission route deflecting obstacles (DO) in the intersection has enhanced significantly the propagation characteristics and provided better signal quality and wider coverage to become comparable to LOS channels. The presented measurements and empirical models may aid the development of futuristic mm-wave radio system in short-range wireless applications.

Type de document: Thèse (Thèse)
Directeur de mémoire/thèse: Talbi, Larbi
Co-directeurs de mémoire/thèse: Delisle, Gilles Y.
Informations complémentaires: Localisation : Bibliothèque L.-Brault TK 5103 .4835 G43 2012. Le texte de cette thèse est en anglais. Comprend des réf. bibliogr. : p. 169-181
Mots-clés libres: Systèmes de communication; Ondes millimétriques; Transmission sans fil; Télécommunications; 60 GHZ
Départements et école, unités de recherche et services: Informatique et ingénierie
Date de dépôt: 06 déc. 2012 21:09
Dernière modification: 12 déc. 2016 17:54
URI: http://di.uqo.ca/id/eprint/509

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