Time-Frequency Combination Based Two-LED Positioning in Visible Light Communication

Fig. 4. The pulses of the real and virtual lights arriving at the receiver when the receiver is at different positions from the mirror (a) 2.5 m; (b) 0 m; (c) 0.25 m; (d) 0.5 m

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Fig. 5. Positioning error of the entire room with the proposed time-frequency combination algorithm

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Fig. 6. Positioning error of the left side of the room. (a) Three-LED positioning model; (b) two-LED positioning model

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Fig. 7. Comparison of cumulative error distribution between LED and mirror

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Table 1. System parameters

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Table 1. System parameters

Parameter	Value
Room size /（m×m×m）	5×5×3
Half power angle /（°）	60
$θ_{F O V}$ /（°）	70
PD physical area /cm²	1
Reflection coefficient of wall	0.6
Reflection coefficient of mirror	1
Receiver hight /m	0.8
LED power /W	35
Gain of the optical filter $T_{s} (ψ)$	1

Table 2. Positioning performance at different positions
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Table 2. Positioning performance at different positions
Distance from mirror position /m Minimum positioning error /cm Average positioning error /cm Maximum positioning error /cm
2.00 5.3 28.3 87.8
1.25 4.1 17.9 73.9
0.75 2.5 15.2 58.2
0.25 1.4 12.4 53.1

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Xinyi Xu, Jun Wang, Anliang Cai, Jian Chen. Time-Frequency Combination Based Two-LED Positioning in Visible Light Communication[J]. Laser & Optoelectronics Progress, 2024, 61(15): 1506002

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