A novel demodulation algorithm for CMOS camera-based VLC using adjacent pixel threshold

Jihong Liu; Xiaoyu Zheng; Jia Zhang; Yongchao Wang

doi:10.1117/12.2544833

18 December 2019 A novel demodulation algorithm for CMOS camera-based VLC using adjacent pixel threshold

Jihong Liu, Xiaoyu Zheng, Jia Zhang, Yongchao Wang

Proceedings Volume 11340, AOPC 2019: Optical Fiber Sensors and Communication; 113400V (2019) https://doi.org/10.1117/12.2544833
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

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.

Citation Download Citation

Jihong Liu, Xiaoyu Zheng, Jia Zhang, and Yongchao Wang "A novel demodulation algorithm for CMOS camera-based VLC using adjacent pixel threshold", Proc. SPIE 11340, AOPC 2019: Optical Fiber Sensors and Communication, 113400V (18 December 2019); https://doi.org/10.1117/12.2544833

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