Optimal Constellation Design for Visible Light Communication with Multi-Color LED

Fig. 5. Total optical power of mc-LED and individual optical power of each LED chip with different CCT values. (a) 3000 K; (b) 4000 K; (c) 5000 K; (d) 5700 K

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Fig. 6. BER curves of two schemes with different CCT values. (a) 3000 K; (b) 4000 K; (c) 5000 K; (d) 5700 K

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Table 1. Binary data corresponding to transmitted signal and equivalent transmitted signal
View table
Table 1. Binary data corresponding to transmitted signal and equivalent transmitted signal
Binary data $x_{1}$ $x_{2}$ $x_{3}$ $s$
00 0 0 0 0
01 0.359 0.158 0.146 0.240
10 0.754 0.326 0.220 0.480
11 0.887 0.716 0.434 0.720

Table 2. Parameters of different LED chips

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Table 2. Parameters of different LED chips

Chip	Peak wavelength /nm	Chromaticity coordinate	LF/FC conversion coefficient /(A/lm)	Receiver responsivity /(A/W)
Red	625	(0.7006, 0.2993)	0.0114	0.42
Green	530	(0.1547, 0.8059)	0.0052	0.34
Blue	460	(0.1440, 0.0297)	0.0427	0.26

Table 3. Configuration parameters of Lambertian model

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Table 3. Configuration parameters of Lambertian model

Parameter	Value
O/E conversion efficiency $μ$ /（A/W）	0.44
Maximum drive current $I_{m a x}$ /A	0.7
FOV semi-angle $Ψ_{c}$ /（°）	60
Half-power semi-angle $Φ_{1 / 2}$ /（°）	70
Physical area of PD $A_{s}$ /cm²	1
Distance between mc-LED and PD $d$ /m	2
Irradiance angle $ψ$ /（°）	50
Incidence angle $ϕ$ /（°）	60
Filter gain $T_{s} (ψ)$	1
Internal refractive index $n$	1.5

Table 4. Center chromaticity coordinates and corner coordinates of quadrangles for different CCT values

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Table 4. Center chromaticity coordinates and corner coordinates of quadrangles for different CCT values

CCT /K	Center chromaticity coordinate	Corner coordinates of quadrangles
CCT /K	Center chromaticity coordinate	A	B	C	D
3000	(0.4339, 0.4033)	(0.4562, 0.4260)	(0.4303, 0.4173)	(0.4150, 0.3821)	(0.4373, 0.3893)
4000	(0.3818, 0.3797)	(0.4003, 0.4035)	(0.3737, 0.3880)	(0.3671, 0.3583)	(0.3895, 0.3709)
5000	(0.3287, 0.3425)	(0.3550, 0.3753)	(0.3375, 0.3619)	(0.3366, 0.3373)	(0.3514, 0.3481)
5700	(0.3375, 0.3619)	(0.3375, 0.3619)	(0.3205, 0.3476)	(0.3221, 0.3256)	(0.3366, 0.3374)

Table 5. Gains of ASK-PBD scheme compared with optimal precoding scheme under different conditions
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Table 5. Gains of ASK-PBD scheme compared with optimal precoding scheme under different conditions
CCT /K 120 lm 150 lm
3 bpcu 4 bpcu 3 bpcu 4 bpcu
3000 1.5 dB 1.6 dB 2.0 dB 2.1 dB
4000 1.4 dB 1.8 dB 2.0 dB 2.3 dB
5000 1.4 dB 1.4 dB 2.0 dB 1.9 dB
5700 1.0 dB 0.9 dB 1.3 dB 1.2 dB

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Jianing Guo, Chao Wang, Jian Zhang. Optimal Constellation Design for Visible Light Communication with Multi-Color LED[J]. Acta Optica Sinica, 2025, 45(3): 0306005

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Paper Information

Category: Fiber Optics and Optical Communications

Received: Sep. 29, 2024

Accepted: Nov. 15, 2024

Published Online: Feb. 10, 2025

The Author Email: Zhang Jian (zhang_xinda@126.com)

DOI:10.3788/AOS241599

CSTR:32393.14.AOS241599

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Binary data corresponding to transmitted signal and equivalent transmitted signal

Table 1. Binary data corresponding to transmitted signal and equivalent transmitted signal

Table 2. Parameters of different LED chips

Table 2. Parameters of different LED chips

Table 3. Configuration parameters of Lambertian model

Table 3. Configuration parameters of Lambertian model

Table 4. Center chromaticity coordinates and corner coordinates of quadrangles for different CCT values

Table 4. Center chromaticity coordinates and corner coordinates of quadrangles for different CCT values

Table 5. Gains of ASK-PBD scheme compared with optimal precoding scheme under different conditions

Table 5. Gains of ASK-PBD scheme compared with optimal precoding scheme under different conditions