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Architectures cross-layer PHY/MAC pour réduire l'effet de blocage de réception dans les réseaux véhiculaires ad-hoc

Abstract : The MAC protocol IEEE 802.11p, dedicated to vehicular ad-hoc networks VANETs, prohibits simultaneous transmissions in the same detection area, in order to avoid interference between neighboring vehicles. This prohibition causes a temporary data reception blocking, which reduces the network throughput. To reduce this adverse impact, we propose in this thesis a cross-layer design PHY/MAC based on a transmit antennas selection algorithm jointly with a dedicated MAC protocol. This design allows receivers to select the best combination of transmit antennas to improve the throughput of each V2V link. The algorithm is presented with a multi-user detection method, which cancels neighbor’s interference and allows vehicles to transmit data simultaneously. The associated MAC protocol ensures the coordination between vehicles during the simultaneous transmission period. The simulation results show a significant network throughput improvement compared to the conventional case. However, this improvement is less important in dense VANETs. For this purpose, we propose to join a cross-layer design PHY/MAC based on a transmit power adaptation algorithm. This design allows transmitters to choice the adequate power level based on corresponding receivers density. The simulation results show that this solution allows more vehicles to communicate simultaneously and thus improves the network throughput, in particular in dense VANETs.
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https://tel.archives-ouvertes.fr/tel-01722144
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Submitted on : Saturday, March 3, 2018 - 1:01:44 AM
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  • HAL Id : tel-01722144, version 1

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Basma Bouraoui. Architectures cross-layer PHY/MAC pour réduire l'effet de blocage de réception dans les réseaux véhiculaires ad-hoc. Traitement du signal et de l'image [eess.SP]. Université de Valenciennes et du Hainaut-Cambresis; École nationale d'ingénieurs de Tunis (Tunisie), 2017. Français. ⟨NNT : 2017VALE0006⟩. ⟨tel-01722144⟩

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