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Contribution à l'estimation des canaux relatifs aux signaux utile et interférent dans un système full-duplex dédié aux communications véhiculaires

Abstract : In this work of thesis, we propose new channel estimation approaches for a full-duplex system dédicated to vehicular communications. Both the self-interference (SI) and intended (SOI) channel are estimated. We propose different estimation méthods according to whether the pilots of the signals are transmitted jointly or separately. In the separate transmission, an estimation based on a new pilot configuration is proposed as well as a hybrid method which use both pilot configuration and training sequences.We also propose an optimisation of the conventional training-based method.It consists of improving the estimation of each training symbole. In the joint transmission, we propose two algorithms that aims to improve the estimation performances compared to the existing methods. In the first proposed method, the two channels are first estimated in the frequency domain using the Landweber iterations. The second proposition consists of using a projection matrix to manipulate only the pilots and avoid the noise that is caused by the SOI unknown datas. Finally, we propose a time and frequency-selective channel estimation for low and medium doppler frequency. Some of the proposed estimators are implemented on a real Full Duplex communication system which use Multi-reconfigurable antennas to perform the passive cancellation.
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Submitted on : Tuesday, September 29, 2020 - 1:03:52 AM
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  • HAL Id : tel-02951817, version 1

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Sélima Sahraoui. Contribution à l'estimation des canaux relatifs aux signaux utile et interférent dans un système full-duplex dédié aux communications véhiculaires. Electronique. Université de Valenciennes et du Hainaut-Cambresis, 2019. Français. ⟨NNT : 2019VALE0008⟩. ⟨tel-02951817⟩

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