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Identification de Systèmes OFDM et Estimation de la QoS : Application à la Radio Opportuniste

Mohamed Rabie Oularbi 1
1 Signal et communications
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
Abstract : The OFDM modulation scheme is being very widespread nowadays (WiFi, WiMAX, \dots) but also advocated as the best modulation candidate for future physical layer networks (3GPP/LTE, IEEE 802.22). This coexistence of OFDM networks makes the radio environment heterogeneous. To take befits from this heterogeneity one can imagine multi-mode terminals able to switch smartly from one standard to another seeking to satisfy the concept of "\textit{always best connected}". This switching process is known as a "\textit{vertical handover}". Before triggering a \textit{vertical handover}, the terminal has first to identify the active surrounding networks and then to evaluate the available quality of service in each detected network. Within this framework, in this thesis, we propose firstly some OFDM systems identification algorithms. Secondly, we focus on the quality of service estimation for CSMA/CA and OFDMA multiple access based networks. Some of the proposed metrics have been evaluated experimentally on the RAMMUS testbed of TELECOM Beretagne. All the proposed algorithms in this thesis are passive, with a low computational cost and do not require any connection to the access point which allow an economy of time and energy resources.
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Submitted on : Friday, January 20, 2012 - 3:42:50 PM
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  • HAL Id : tel-00661753, version 1

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Mohamed Rabie Oularbi. Identification de Systèmes OFDM et Estimation de la QoS : Application à la Radio Opportuniste. Traitement du signal et de l'image [eess.SP]. Ecole Nationale Supérieure des Télécommunications de Bretagne - ENSTB; Université Rennes 1, 2011. Français. ⟨tel-00661753⟩

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