Études de la mise en oeuvre matérielle d’une transmission sans fil combinant retournement temporel et OFDM

Abstract : The spectacular growth of wireless communications systems has led to a sharp increase in data traffic, which should continue to grow over the next few years. The future generation of cellular networks (5G) must be able to support this growth of traffic, while presenting reduced energy consumption compared to existing networks. Among the different studied technologies, time reversal (TR) is a serious candidate to meet these constraints. Indeed, the numerous theoretical studies on the subject have shown that the combination of TR and OFDM has interesting performance, specifically thanks to its temporal compression and spatial focusing properties. However, the assumptions made in the theoretical studies are not always compatible with the practical implementation of a real system. The objective of this thesis is to propose solutions to unrealistic theoritical hypotheses, in order to implement them in a real hardware prototype combining TR and OFDM in a MISO context. First, the implementation of the channel estimation at the transmitter side, and the synchronization of the MISO TR-OFDM system is studied. Then, a calibration solution at the transmitter is proposed to compensate for the non-reciprocal nature of the baseband propagation channel. All these solutions as well as the focusing properties of TR are validated by experimental measurements using the developed prototype. Finally, the implementation of the first TR prototype of spatial modulation at the receiver side is presented.
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Submitted on : Tuesday, May 21, 2019 - 9:45:56 PM
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  • HAL Id : tel-02136210, version 1


Yvan Kokar. Études de la mise en oeuvre matérielle d’une transmission sans fil combinant retournement temporel et OFDM. Réseaux et télécommunications [cs.NI]. INSA de Rennes, 2018. Français. ⟨NNT : 2018ISAR0031⟩. ⟨tel-02136210⟩



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