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Lyu, Pengfei. "Numerical and Experimental Indoor Channel Analysis for LOS-NLOS Identification at 60 GHz". Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS186.
Pełny tekst źródłaWith the emergence of connected objects, potential applications requiring indoor location or location continuity have reappeared and have been the subject of numerous studies and researches for several years now. The IEEE 802.11ad standard, operating around 60 GHz, is a potential candidate to solve the localization problem while allowing high data rate communication. However, this promising standard is particularly subject to blockage of direct waves. Indeed, no calculation of spatial coordinates can be undertaken if the processed signals do not come from a line of sight propagation (LOS). This limitation consequently induces a new problem which consists in ensuring, in the signals of interest, the presence of the LOS contribution. It also comes down to identifying the NLOS components brought by the multipath phenomenon. NLOS path identification uses beam-learning methods that provide access to the angular spectrum of a channel. A first classification, by clusters, is carried out, then a statistical analysis using the fourth standardized moment, is conducted on each cluster. The use of this "kurtosis" signature allows a second classification discriminating clusters induced by LOS contributions from those induced by NLOS contributions
Perros-Meilhac, Lisa. "Identification autodidacte spatio-temporelle de canaux de propagation à trajets multiples : application à l'égalisation non-coopérative des transmissions ionosphériques /". Paris : École nationale supérieure des télécommunications, 2001. http://catalogue.bnf.fr/ark:/12148/cb38828404p.
Pełny tekst źródłaNimier, Vincent. "Contribution à l'estimation des paramètres caractérisant la propagation par trajets multiples : application en acoustique sous-marine". Grenoble INPG, 1990. http://www.theses.fr/1990INPG0135.
Pełny tekst źródłaOuamri, Abdelaziz. "Étude des performances des méthodes d'identification à haute résolution et application à l'identification des échos par une antenne linéaire multicapteurs". Paris 11, 1986. http://www.theses.fr/1986PA112172.
Pełny tekst źródłaThis thesis deals with performances of high resolution identification methods applied to correlated or non-correlated sources, using a linear array antenna. We show that in the case of totally correlated sources (multiple paths) the covariance matrix must be computed using a "sliding average" (spatial averaging). The finite size of the sample induces a statistical error on the estimation of the covariance matrix. We henceforth have to study the perturbations of the eigenvectors and eigenvalues of this matrix. The study of eigenvalues led us to introduce a criterium allowing the determination of the number of sources. The study of eigenvectors enabled us to find a relationship between these perturbations and the corresponding ones on the sources. We could thus compare to optimality the methods of both Tufts-Kumaresan, and the goniometer. The optimal case was established thanks to a new approach. We thus obtained general formulas giving the minimum variance (Cramer-Rao bounds). We compared to this optimal quantity the variance obtained by each method. Without sliding average, we show that the goniometer method is quasi¬ optimal, while the Tufts-Kumaresan method give poorer results. We also introduce a new quasi maximum likelihood method which is quasi-optimal either with correlated or non-correlated sources. If sliding average is used, the Tufts-Kumaresan method is near optimal even in the case of totally correlated sources. As an original result, we established a method for estimating the covariance matrix in a Toeplitz form without bringing any bias on the estimation of the sources. All these identification methods were tested on experimental data in an anechoïd chamber (multiple paths simulation)
Hamieh, Hamzeh. "Caractérisation diélectrique de parois de bâtiments : conception d'un banc de msure impulsionnel Ultra Large Bande (ULB) et détermination des paramètres pertinents de diverses parois". Limoges, 2012. http://aurore.unilim.fr/theses/nxfile/default/ca0fe54a-b230-4f56-b08a-0e2b1735a50a/blobholder:0/2012LIMO4051.pdf.
Pełny tekst źródłaThis thesis presents the implementation of a measurement bench, in free space, UWB transient, associated with extraction techniques of dielectric properties in order to characterize the walls of buildings. The measurement techniques developed within the team of OSA XLIM are applied, adapted and improved for measuring the reflection and transmission through the walls. Associated with extraction techniques developed during the study, the material properties are obtained. The means used to characterize the material are presented and validated through rigorous electromagnetic simulations. Finally, two materials are subject to experimental characterization : the natural rock and the concrete blocks
Rolim, Fernandes Carlos Estêvao. "Méthodes statistiques d'ordre élevé pour l'identification aveugle de canaux et la détection de sources avec des applications aux systèmes de communicaton sans fil". Phd thesis, 2008. http://tel.archives-ouvertes.fr/tel-00460158.
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