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Nouvelle méthode d'estimation des différences de temps d'arrivée pour la localisation des objets connectés haut débit

par Jafari, Ahmadreza
Président du jury DENBY, Bruce
Promoteur De Doncker, Philippe ;Benlarbi-Delaï, Aziz
Publication Non publié, 2015-02-03

Thèse de doctorat

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Résumé :

This thesis is organized as follows:In the first chapter, the context and objective of this research are stated. First, new emerging applications demanding wireless high data rate communications are presented with a focus on the next generation of mobile networks (5G). Then, millimeter wave communication, and particularly 60 GHz technology, is explored as a solution to meet the requirements of mentioned high data rate applications. Energy aspects are also considered.All these elements of context lead to localization as one of the main tools required to achieve green radio systems. Furthermore, indoor localization, which is the final objective in the context of this research area, is explored regarding its growing recent applications.In the second chapter, the state of art of 60 GHz communication systems and indoor positioning methods are presented. In the 60 GHz section, propagation characteristics, material impacts, technological aspects, modulation schemes and standards are briefly described. In the indoor positioning section, methods and metrics are presented, and TDOAis chosen as a promising solution for compact and asynchronous localization function in the context of ultra wide band high data rate millimeter wave communications.In the third chapter, a new TDOA based method, well suited to 60 GHz communication systems, is presented. Based on Multiple Input Single Output (MISO) high data rate communication signal, this method is explored regarding two di↵erent approaches: TDOA estimation using Error Vector Magnitude (EVM) of received signal, and TDOA estimation using Channel Equivalent Response (ECR) performed in mono-band and multi-band configurations. The system description and formulations are presented in detail and the prediction of theory is confirmed through first stage of simulations. Finally, the IEEE channel is introduced and simulations are performed to illustrate the accuracy and e-ciency of the proposed approach in a realistic environment.In the fourth chapter, measurement campaigns and experimental results, acting as a second mean of theory and model validation, are presented. Coupling vectorial network analyzer based measurements and 60 GHz communication system based measurement, qualitative and quantitative results are obtained for di↵erent types of communication channel. As this research is led in the frame of European doctoral school EIT ICT labs, some measurements have been carried out in Berlin at Fraunhofer HHI.Finally, section 5 concludes this work and presents the perspectives of this research.