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Theses

Multi-user Interference Mitigation in Visible-Light Communication Networks

Abstract : Visible light communication (VLC) is a promising technology for providing energy-efficient wireless connectivity in both indoor and outdoor environments, and is regarded as a serious candidate for providing wireless access in beyond-5G networks. When deployed in large spaces, a multi-cell architecture needs to be adopted using multiple luminaires. In addition, efficient solutions should be used to manage the user mobility, as well as the multi-user interference (MUI) when multiple users (or devices) should be connected to the network. There, a simple solution is that of multi-user multiple-input single-output (MU-MISO) with zero-forcing (ZF) pre-coding at the transmitter. However, this scheme can only handle a limited number of users and, furthermore, its performance is very sensitive to the condition number of the network channel matrix. More efficient multiple-access (MA) signalling schemes need to be designed in order to allow serving potentially large numbers of users, while ensuring smooth handovers as well as efficient resource management to mitigate MUI, which has been the subject of this research.In this thesis, firstly, we propose the optimization of the transmitter and the receiver parameters to improve the performance of the ZF pre-coding VLC networks, by decreasing the correlation in the network channel matrix. Following this, and in order to handle a potentially large number of users, we propose novel MA techniques, which allow efficient MUI mitigation and improved network performance. In particular, we propose a hybrid non-orthogonal multiple-access (NOMA)- ZF pre-coding scheme, where ZF pre-coding is used for broadcasting the signals of the cell-edge users with the highest decoding order in the NOMA scheme. On the other hand, for the case of NOMA-based transmission, we propose handling MUI in a dimming-aware manner, through efficient time-scheduling, scaling, and coordination of the transmissions within each cell. Furthermore, we investigate the case of user mobility, and propose new efficient soft handover techniques, which guarantee an improved network throughput and reliability.
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https://tel.archives-ouvertes.fr/tel-03702254
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Submitted on : Thursday, June 23, 2022 - 1:02:22 AM
Last modification on : Thursday, June 23, 2022 - 3:11:01 AM

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  • HAL Id : tel-03702254, version 1

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Mahmoud Eltokhey. Multi-user Interference Mitigation in Visible-Light Communication Networks. Networking and Internet Architecture [cs.NI]. Ecole Centrale Marseille, 2021. English. ⟨NNT : 2021ECDM0005⟩. ⟨tel-03702254⟩

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