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Indoor channel modeling and high data-rate Transmission for visible-light communication systems

Abstract : Visible Light Communications (VLC) have attracted particular attention in the research community since a few years as a promising solution for high-speed indoor wireless networks. By exploiting the existing solid-state light-emitting diode (LED) lighting infrastructure, VLC offer numerous advantages such as a large unlicensed bandwidth, transmission security, and immunity to electro-magnetic interference compared to their radiofrequency counterparts. Within the context of indoor VLC, the multipath propagation channel and the non-ideal characteristics of the commercial white LEDs cause the main limitations for achieving high data-rate transmission. The objective of this thesis is to investigate the true impact of these limitations on the data transmission and to propose efficient signal processing solutions to mitigate their adverse effects. We start by the study of the indoor VLC channel impulse response by developing an efficient simulation tool. We then consider evaluating the channel frequency selectivity through different metrics. Next, given the potentially frequency-selective channel and the limited modulation bandwidth of the LEDs, we investigate the suitability of employing different signal transmission techniques including optical orthogonal frequency-division multiplexing (O-OFDM) in order to achieve high data-rate transmission. Given the high peak-to-average power ratio (PAPR) of O-OFDM signals and the limited dynamic range of the LEDs, we then propose a novel transmission scheme, which consists of using carrier-less amplitude and phase (CAP) modulation together with frequency domain equalization (FDE) at the receiver. We analyze the performance of the VLC link using this technique and compare it with the O-OFDM schemes, especially by taking the non-linear characteristics of the LED into account. Lastly, we demonstrate the merits of using the CAP-FDE transmission scheme via some experimental results.
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https://hal.inrae.fr/tel-03197173
Contributor : Ali Khalighi <>
Submitted on : Tuesday, April 13, 2021 - 3:42:11 PM
Last modification on : Tuesday, July 13, 2021 - 3:50:25 AM
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  • HAL Id : tel-03197173, version 1

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Shihe Long. Indoor channel modeling and high data-rate Transmission for visible-light communication systems. Signal and Image processing. Ecole Centrale Marseille (ECM), 2016. English. ⟨tel-03197173⟩

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