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Proceedings Paper

A novel demodulation algorithm for CMOS camera-based VLC using adjacent pixel threshold
Author(s): Jihong Liu; Xiaoyu Zheng; Jia Zhang; Yongchao Wang
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Paper Abstract

Using rolling shutter effect of the CMOS camera can increase the data rate of camera-based visible light communication (VLC) system. However, when fewer pixel columns represent one bit, the grayscale value fluctuation becomes serious, which leads to data logic not being correctly defined by the threshold, and therefore degrades the demodulation performance. In this paper, a thresholding scheme based on adjacent pixel grayscale value to reduce the influence of grayscale value fluctuation is proposed, which sets threshold using the grayscale values of the forward and backward pixels adjacent to the current pixel. And combining with segment downsampling, experimental results show that the proposed demodulation algorithm can achieve a bit-error-rate (BER) performance well below the forward error correction (FEC) limit of 3.8×10-3 with the bit resolution of 2.962 pixel/bit, and the net data rate can reach 10.56 kbit/s.

Paper Details

Date Published: 18 December 2019
PDF: 5 pages
Proc. SPIE 11340, AOPC 2019: Optical Fiber Sensors and Communication, 113400V (18 December 2019); doi: 10.1117/12.2544833
Show Author Affiliations
Jihong Liu, Xi'an Univ. of Posts and Telecommunications (China)
Xiaoyu Zheng, Xi'an Univ. of Posts and Telecommunications (China)
Jia Zhang, Xi'an Univ. of Posts and Telecommunications (China)
Yongchao Wang, Xi'an Univ. of Posts and Telecommunications (China)

Published in SPIE Proceedings Vol. 11340:
AOPC 2019: Optical Fiber Sensors and Communication
Jie Zhang; Songnian Fu; Jun Yang, Editor(s)

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