Dimming control scheme for VLC systems based on multilevel data transmission

Yu Zuo; Jian Zhang

doi:10.1364/AO.57.009584

Applied Optics
Vol. 57,
Issue 32,
pp. 9584-9588
(2018)
•https://doi.org/10.1364/AO.57.009584

Dimming control scheme for VLC systems based on multilevel data transmission

Yu Zuo and Jian Zhang

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Yu Zuo and Jian Zhang, "Dimming control scheme for VLC systems based on multilevel data transmission," Appl. Opt. 57, 9584-9588 (2018)

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Related Topics
Table of Contents Category
- Fiber Optics, Fiber Sensors, and Optical Communications
Optics & Photonics Topics
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The topics in this list come from the Optics and Photonics Topics applied to this article.

About this Article
History
- Original Manuscript: July 25, 2018
- Revised Manuscript: October 15, 2018
- Manuscript Accepted: October 15, 2018
- Published: November 5, 2018

Abstract

As an emerging wireless communications technology, visible light communications (VLC) have attracted much attention for synergistically providing both high-speed data transmission and high-quality illumination. To provide energy savings and ecological benefits, dimming control is an essential function in VLC systems where users can obtain the required illumination levels. However, the conventional binary-based dimming schemes are spectrally inefficient. In this paper, we propose a novel multilevel data transmission scheme for VLC systems that can achieve dimming control and communication functions simultaneously. Additionally, the encoding/decoding structure is provided where the specific symbol set can maintain the specific dimming level. Finally, simulation results show that the proposed multilevel transmission scheme can achieve increased spectral efficiency and better error performance.

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$ω$	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
$n$
0	1
1	1	1	1	1
2	1	2	3	4	3	2	1
3	1	3	6	10	12	12	10	6	3	1
4	1	4	10	20	31	40	44	40	31	20	10	4	1
5	1	5	15	35	65	101	135	155	155	135	101	65	35	15	5	1
6	1	6	21	56	120	216	336	456	546	580	546	456	336	216	120	56	21	6	1

$x_{I}$	$x$ with $γ \in (0, 0.5)$	$x$ with $γ \in (0.5, 1)$	$x_{I}$	$x$ with $γ \in (0, 0.5)$	$x$ with $γ \in (0.5, 1)$
00	000	333	03	003	330
01	001	332	30	030	303
10	010	323	22	311	022
11	011	322	13	320	013
02	002	331	31	302	031
20	020	313	23	310	023
12	012	321	32	301	032
21	021	312	33	300	033

$n$	2	4	6
$l_{\max}$
2	0.250	0.312	0.344
4	0.319	0.364	0.386
8	0.354	0.391	0.403

Scheme	Spectral Efficiency
VOOK	${\begin{matrix} 2 γ, & 0 < γ < 0.5 \\ 2 (1 - γ), & 0.5 \leq γ < 1 \end{matrix}$
VPPM	${\begin{matrix} γ, & 0 < γ < 0.5 \\ 1 - γ, & 0.5 \leq γ < 1 \end{matrix}$
MPPM	$\frac{⌊ \log_{2} (\binom{n}{ω}) ⌋}{n}$
ML-MPPM	$\frac{⌊ \log_{2} \| R_{n, ω} \| ⌋}{n}$
ML-WTCC	$\frac{a n}{n + 1}$

$ω$	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
$n$
0	1
1	1	1	1	1
2	1	2	3	4	3	2	1
3	1	3	6	10	12	12	10	6	3	1
4	1	4	10	20	31	40	44	40	31	20	10	4	1
5	1	5	15	35	65	101	135	155	155	135	101	65	35	15	5	1
6	1	6	21	56	120	216	336	456	546	580	546	456	336	216	120	56	21	6	1

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Equations (9)

Applied Optics