Visible DCO-OFDM System Based on LWT

Li ZHAO, Hanghang DONG^*, and Feng ZHANG

Author Affiliations

School of Electronic Information Engineering， Xi'an Technological University， Xi'an710021， China

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DOI: 10.3788/gzxb20215005.0506002 Cite this Article

Li ZHAO, Hanghang DONG, Feng ZHANG. Visible DCO-OFDM System Based on LWT[J]. Acta Photonica Sinica, 2021, 50(5): 121 Copy Citation Text

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Fig. 1. Single light source indoor visible light system model

Fig. 2. Visible light LWT-OFDM system block diagram

Fig. 3. The illumination of PD at different locations

Fig. 4. Reliability comparison between FFT-OFDM and LWT-OFDM

Fig. 5. Comparison of different cyclic prefixes

Fig. 6. Peak ratio characteristics of FFT-OFDM and LWT-OFDM systems

Fig. 7. LWT-OFDM experimental environment

Fig. 8. Constellation with different modulation modes

Parameter	Value
Room size	4 m×4 m×3 m
Central luminous intensity of LED/lx	21
Reflectivity of walls $ρ_{i}$	0.8
Unit reflected area $Δ A / c m^{2}$	0.01
LED $F O V / (°)$	90
Radiation mode of light source	1
Point light location	(2,2,3)
Light receiving area $A_{R} / c m^{2}$	1

Table 1. Simulation parameters of point light source

Frame	LWT-OFDM time	FFT-OFDM time	LWT-OFDM BER	FFT-OFDM BER	SNR
1	0.094	0.077	2.003 784×10^-1	2.562 103×10^-1	0
1	0.051	0.028	1.322 937×10^-1	1.702 271×10^-1	2
1	0.05	0.032	7.548 523×10^-2	1.009 521×10^-1	4
1	0.018	0.016	4.150 391×10^-2	5.096 436×10^-2	6
1	0.016	0.017	1.992 798×10^-2	2.622 986×10^-2	8
1	0.022	0.015	7.965 088×10^-3	1.426 697×10^-2	10
1	0.025	0.017	3.433 228×10^-3	8.544 922×10^-3	12
1	0.017	0.016	1.525 879×10^-3	4.058 838×10^-3	14
1	0.017	0.016	6.561 279×10^-4	1.922 607×10^-3	16
1	0.017	0.018	2.593 994×10^-4	5.493 164×10^-4	18
1	0.017	0.02	6.103 516×10^-5	9.155 273×10^-5	20

Table 2. Comparison of time and results

Li ZHAO, Hanghang DONG, Feng ZHANG. Visible DCO-OFDM System Based on LWT[J]. Acta Photonica Sinica, 2021, 50(5): 121

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