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Contribution à l'étude du problème de synchronisation de porteuse dans le contexte de la Radio Intelligente

Abstract : Although the extensive research works have been carried out over the last two decades to resolve the problem of carrier synchronization, it remains today an issue of paramount importance for many recent digital communication systems such as the emerging wireless technologies of Software Defined Radio (SDR) and Cognitive Radio (CR). Indeed, SDR systems are multi-functional and flexible such that they can handle a variety of standards and services while at the same time provide a low-cost powerefficient solution. As for CR technology, it is a future vision of a smart radio targeting the design of wireless devices with cognition capabilities such as learning, sensing, awareness and reasoning. This implies that the well-developed solutions of the synchronization problem should be adapted to this new generation of radio technology design to get the best performance. Several contributions to the problem of carrier phase synchronisation have been carried out in this thesis. In the first part of the work, we have performed a rigorous and complete theoretical analysis of the DD phase detector. Based on the results of this study, we have proposed an optimized carrier phase synchronizer for 16-QAM modulation and a new phase lock detector for general QAM modulations. Then, we have developed a blind-modulation carrier recovery loop suited to CR applications which is capable of handling different digital modulation schemes. The underlying idea is to use a measure named "reliability" extracted from the phase detector of the loop synchronization which provides information about the incoming signal modulation format. Finally, we have discussed a SIMO approach for phase carrier synchronization which exploits the capabilities offered by the SDR receiver architectures.
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Submitted on : Wednesday, November 10, 2010 - 4:22:31 PM
Last modification on : Friday, January 8, 2021 - 3:41:27 AM
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  • HAL Id : tel-00534856, version 1

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Adel Metref. Contribution à l'étude du problème de synchronisation de porteuse dans le contexte de la Radio Intelligente. Interface homme-machine [cs.HC]. Université Rennes 1, 2010. Français. ⟨tel-00534856⟩

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