Spatial and Time Dispersions Compensation With Double-Equalization for Optical Camera Communications

In a mobile phone-based optical camera communication (OCC) system, the spatial and time dispersions, due to inter-pixel crosstalk and exposure time overlapping, deteriorate the transmission performance considerably. In this letter, a double-equalization method is studied and experimentally demonstra...

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Bibliographic Details
Published in:IEEE photonics technology letters 2019-11, Vol.31 (21), p.1753-1756
Main Authors: Liu, Liqiong, Deng, Rui, Chen, Lian-Kuan
Format: Article
Language:English
Subjects:
Cameras
Crosstalk
Decoding
Diodes
Dispersions
Equalization
Gray-scale
Image coding
Indexes
Light emitting diodes
Mobile communication systems
Optical camera communication
rolling shutter effect
Signal processing
Signal resolution
visible light communication
White light
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Summary:In a mobile phone-based optical camera communication (OCC) system, the spatial and time dispersions, due to inter-pixel crosstalk and exposure time overlapping, deteriorate the transmission performance considerably. In this letter, a double-equalization method is studied and experimentally demonstrated in a rolling-shutter based OCC system, showing a record-high transmission data rate for a single white light-emitting diode (LED) system. Moreover, we further propose an improved technique to reduce the overhead of the signal extraction process while achieving similar performance. The effect of the normalization factor in the gamma correction processing is also investigated.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2019.2945405