An effective interference suppression algorithm for visible light communication system based on DBSCAN

Guojun Lu; Hongzhan Liu

doi:10.3788/COL202018.011001

Chinese Optics Letters, Volume. 18, Issue 1, 011001(2020)

An effective interference suppression algorithm for visible light communication system based on DBSCAN

Guojun Lu¹ and Hongzhan Liu^2、*

¹College of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China

²Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, Guangzhou 510006, China

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Figures & Tables(10)

Fig. 1. (a), (b) Green channel distribution of images; (c), (d) green channel distribution of images after low-pass filter and the third-order polynomial fitting (green curve); (e), (f) the judgement through comparing with the threshold.

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Fig. 2. (a) Ideal edge, (b) real edge, (c) part of the sample image, (d) processed image after judgement, and (e) image processed by the improved algorithm.

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Fig. 3. Select a row of pixels in the image.

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Fig. 4. Flow chart of improved DBSCAN algorithm.

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Fig. 5. Experimental results: (a), (d) unprocessed image; (b), (e) processed and analyzed image; (c), (f) processed image.

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Fig. 6. Experimental results: (a), (c) green channel distribution of unprocessed images; (b), (d) green channel distribution of processed images.

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Fig. 7. (a), (d), (g) Sample images; (b), (e), (h) details of sample images; (c), (f), (i) images processed by the improved DBSCAN algorithm.

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Table 1. Color of Binary Sequence
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Table 1. Color of Binary Sequence
1st/B 2nd/G 3rd/R Color
0 0 0 Black
0 0 1 Red
0 1 0 Green
0 1 1 Yellow
1 0 0 Blue
1 0 1 Purple
1 1 0 Blue–green
1 1 1 White

Table 2. Modulation Example
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Table 2. Modulation Example
Binary Sequence Sample Output Sample
000001010011 Black red green yellow

Table 3. Experimental BER ( $\times 10^{- 3}$ ) versus Different Eps and MinPts
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Table 3. Experimental BER ( $\times 10^{- 3}$ ) versus Different Eps and MinPts
Eps MinPts
2 3 4 5 6 7
4 3.58 3.58 2.39 1.00 4.42 32.76
5 3.39 3.39 2.59 0.60 2.81 21.10
6 3.39 3.39 2.59 0.80 2.60 17.97
7 3.39 3.39 2.59 0.60 2.40 16.72
8 3.78 3.78 2.59 0.60 2.20 16.51
10 6.95 6.16 3.98 0.60 2.20 16.51
12 9.53 8.53 4.18 0.80 2.20 16.51

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Guojun Lu, Hongzhan Liu. An effective interference suppression algorithm for visible light communication system based on DBSCAN[J]. Chinese Optics Letters, 2020, 18(1): 011001

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