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Conception de formes d'onde multi-porteuses dans le contexte de systèmes de communication 5G/6G

Abstract : Filter-Bank Multi-Carrier (FBMC) system, is a promising technology to enable future wireless communications e.g., 5G/6G. When compared to the Orthogonal Frequency division Multiplexing (OFDM), FBMC systems have better frequency localization, and consequently, cause less interference to neighboring systems. FBMC systems can be associate to different modulations such as quadrature amplitude modulation, which leads us to the QAM-FBMC system, or offset QAM called (OQAM-FBMC). In both cases, the prototype filter design is a key to guarantee good performance, since it will be used to construct all the filters of the filterbank. In this thesis, we address the problem of prototype filter design for OQAM-FBMC and QAM-FBMC systems, under the light of the optimization procedures. We proceed a careful choice of the objective function to be minimized for reducing the intrinsic interference while keeping the spectral confinement. We also investigate the performance of multicarrier systems through their bit error probability (BEP). To evaluate the performance of QAM-FBMC systems we propose a mathematical expression of its BEP. We investigate how the choice of the prototype filter affects the system interference and consequently the BEP. Although several prototype filters have been designed for QAM-FBMC systems, a residual interference is still observed and degrades system performance. Therefore, a more elaborated receiver is needed. Thus, we also conduct a research on receivers in order to reduce interference and we propose a receiver specifically designed for QAM-FBMC systems.
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https://tel.archives-ouvertes.fr/tel-03498453
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Submitted on : Tuesday, December 21, 2021 - 9:18:09 AM
Last modification on : Monday, February 21, 2022 - 3:38:09 PM
Long-term archiving on: : Tuesday, March 22, 2022 - 7:04:26 PM

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Iandra Galdino Andrade. Conception de formes d'onde multi-porteuses dans le contexte de systèmes de communication 5G/6G. Traitement du signal et de l'image [eess.SP]. HESAM Université; Universidade federal do Rio de Janeiro, 2021. Français. ⟨NNT : 2021HESAC006⟩. ⟨tel-03498453⟩

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