Uniformity improvement on received optical power for an indoor visible light communication system with an angle diversity receiver

Sihui Chi; Ping Wang; Shuqiang Niu; Hui Che; Zhao Wang; Yiran Wu

doi:10.1364/AO.432653

Applied Optics
Vol. 60,
Issue 26,
pp. 8031-8037
(2021)
•https://doi.org/10.1364/AO.432653

Uniformity improvement on received optical power for an indoor visible light communication system with an angle diversity receiver

Sihui Chi, Ping Wang, Shuqiang Niu, Hui Che, Zhao Wang, and Yiran Wu

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Sihui Chi, Ping Wang, Shuqiang Niu, Hui Che, Zhao Wang, and Yiran Wu, "Uniformity improvement on received optical power for an indoor visible light communication system with an angle diversity receiver," Appl. Opt. 60, 8031-8037 (2021)

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Table of Contents Category
- Fiber Optics, Fiber Sensors, and Optical Communications
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About this Article
History
- Original Manuscript: May 31, 2021
- Revised Manuscript: August 9, 2021
- Manuscript Accepted: August 9, 2021
- Published: September 7, 2021

Abstract

In this work, an angle diversity receiver (ADR) structure is proposed to optimize the uniformity of the received optical power distribution in an indoor visible light communication (VLC) system. Taking the rectangular and hybrid layouts with 16 light-emitting diodes as examples, different inclination angles and the number of side detectors are investigated with three diversity combining techniques in a typical room, where the primary reflection of the wall is considered. Simulation results showed that the inclination angles and the number of side detectors would affect the variance and average of the received optical power, and the variance would decrease with the increase of the number of side detectors. In addition, maximal ratio combining is more suitable for the ADR when the variance and average of the received optical power are considered simultaneously. By applying the ADR with five side detectors, the variances of the received optical power will decrease by 81.34% and 86.09% under the rectangle layout and the hybrid layout, respectively. This work will benefit the design and development of the VLC system.

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Parameter	Value
Room size ( $L \times W \times H$ )	$5 m \times 5 m \times 3 m$
The reflection coefficient of the wall	0.8
Semi-angle at half-power of LED $θ_{1 / 2}$	60°
Optical power of LED $P_{t}$	0.452 W
Height of the receiver	0.85 m
LEDs in each lamp	$7 \times 7$
Interval between LEDs	0.01 m
The FOV of the PD	90°
Area of the PD $A_{P D}$	$1 {c m}^{2}$
Gain of optical filter $T_{s} (ψ)$	1
Optical concentrator gain $G (ψ)$	1
Photoelectric transformation efficiency $r$	0.35 A/W

		Received Optical Power
Number of Detector(s)	Inclination Angle (°)	Maximum (dBm)	Minimum (dBm)	Average (dBm)	Variance (dB)
$N_{r} = 1$	/	0.7029	−5.8799	−1.4961	2.1383
$N_{r} = 3$	75	0.8464	−3.4170	−0.4502	0.6250
$N_{r} = 4$	78	0.4398	−3.4674	−0.7667	0.5171
$N_{r} = 5$	80	0.1238	−3.5363	−1.0168	0.4480
$N_{r} = 6$	82	−0.1938	−3.6507	−1.2664	0.3991

		Received Optical Power
Number of Detector(s)	Inclination Angle (°)	Maximum (dBm)	Minimum (dBm)	Average (dBm)	Variance (dB)
$N_{r} = 1$	/	1.6699	−6.1725	−1.4041	3.2259
$N_{r} = 3$	72	0.9656	−3.1020	−0.6632	0.7582
$N_{r} = 4$	75	0.4030	−3.3082	−1.0826	0.6026
$N_{r} = 5$	77	0.0340	−3.5505	−1.3230	0.5094
$N_{r} = 6$	78	−0.2309	−3.7118	−1.4843	0.4487

Parameter	Value
Room size ( $L \times W \times H$ )	$5 m \times 5 m \times 3 m$
The reflection coefficient of the wall	0.8
Semi-angle at half-power of LED $θ_{1 / 2}$	60°
Optical power of LED $P_{t}$	0.452 W
Height of the receiver	0.85 m
LEDs in each lamp	$7 \times 7$
Interval between LEDs	0.01 m
The FOV of the PD	90°
Area of the PD $A_{P D}$	$1 {c m}^{2}$
Gain of optical filter $T_{s} (ψ)$	1
Optical concentrator gain $G (ψ)$	1
Photoelectric transformation efficiency $r$	0.35 A/W

		Received Optical Power
Number of Detector(s)	Inclination Angle (°)	Maximum (dBm)	Minimum (dBm)	Average (dBm)	Variance (dB)
$N_{r} = 1$	/	0.7029	−5.8799	−1.4961	2.1383
$N_{r} = 3$	75	0.8464	−3.4170	−0.4502	0.6250
$N_{r} = 4$	78	0.4398	−3.4674	−0.7667	0.5171
$N_{r} = 5$	80	0.1238	−3.5363	−1.0168	0.4480
$N_{r} = 6$	82	−0.1938	−3.6507	−1.2664	0.3991

Abstract

Data Availability

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Figures (7)

Tables (3)

Equations (9)

Applied Optics