Conception d'un sondeur de canal MIMO - Caractérisation du canal de propagation d'un point de vue directionnel et doublement directionnel

Abstract : Since the appearance of the first analogue cellular radiomobile networks at the beginning of the 70s, the demand for wireless communication systems has boomed. The services concerned by the wireless telecommunications have then been extended to data transmission and multimedia applications. Regarding the necessity of high rates transmission while guaranteeing a certain quality of service, MIMO systems (Multiple Input - Multiple Output) seem very promising. By using several antennas simultaneously at the both sites of communication link, these systems exploit the spatial dimension to transmit information. Thus, the implementation of these techniques permits to achieve a substantial improvement of data rates and digital link performances. As in all system studies, a thorough analysis of the transmission channel and the associated propagation mechanisms proves to be essential. If in a classical context, the channel characterization and modelling can be limited to the time domain, it is then necessary for the MIMO systems to consider the spatial dimension at the same level as the time dimension. A precise and realistic channel modelling in the spatial domain is essential in the MIMO context, because the gain with regard to a classical system in term of rate and/or performance is widely dependent on spatial channel properties. This is the context in which the work is presented in this document. This thesis deals with the design and the realisation of a powerful measurement system allowing a precise characterization of the MIMO propagation channel knowledge for the UMTS application.
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Submitted on : Monday, December 6, 2004 - 5:29:41 PM
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  • HAL Id : tel-00007560, version 2

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Ronan Cosquer. Conception d'un sondeur de canal MIMO - Caractérisation du canal de propagation d'un point de vue directionnel et doublement directionnel. Autre. INSA de Rennes, 2004. Français. ⟨tel-00007560v2⟩

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