Abstract

Optical wireless communication (OWC) has emerged as a complementary or alternative technology to the radio-frequency (RF) communication. OWC based on image sensor, which is also called optical camera communication (OCC) has attracted much attention from industrial and academic societies. Here, we discuss several recent OCC technologies. We propose and demonstrate a light emitting diode (LED) light panel and rolling shutter image sensor based OCC system using frame-averaging background removal (FABR) technique, Z-score normalization, and neural network (NN). Here, a driver circuit for the LED display panel based on a bipolar-junction-transistor (BJT) and a metal-oxide-semiconductor field-effect-transistor (MOSFET) is also discussed. It can provide low enough driving frequency from a few Hz to kHz and high bias current for the LED light panel. Experimental results show that the proposed scheme can mitigate the inter-symbol interference (ISI) observed in the rolling shutter pattern produced by the high noise-ratio (NR) of the display contents.

Optical camera communication (OCC) using a laser-diode coupled optical-diffusing fiber (ODF) and rolling shutter image sensor

Deng-Cheng Tsai, Yun-Han Chang, Chi-Wai Chow, Yang Liu, Chien-Hung Yeh, Ching-Wei Peng, and Li-Sheng Hsu
Opt. Express 30(10) 16069-16077 (2022)

Unmanned-aerial-vehicle based optical camera communication system using light-diffusing fiber and rolling-shutter image-sensor

Yun-Han Chang, Shang-Yen Tsai, Chi-Wai Chow, Chih-Chun Wang, Deng-Cheng Tsai, Yang Liu, and Chien-Hung Yeh
Opt. Express 31(11) 18670-18679 (2023)

PAM4 rolling-shutter demodulation using a pixel-per-symbol labeling neural network for optical camera communications

Yun-Shen Lin, Chi-Wai Chow, Yang Liu, Yun-Han Chang, Kun-Hsien Lin, Yi-Chang Wang, and Yi-Yuan Chen
Opt. Express 29(20) 31680-31688 (2021)

Rolling-shutter-effect camera-based visible light communication using RGB channel separation and an artificial neural network

Ke-Ling Hsu, Chi-Wai Chow, Yang Liu, Yu-Chun Wu, Chong-You Hong, Xin-Lan Liao, Kun-Hsien Lin, and Yi-Yuan Chen
Opt. Express 28(26) 39956-39962 (2020)

Wavy water-to-air optical camera communication system using rolling shutter image sensor and long short term memory neural network

Shang-Yen Tsai, Yun-Han Chang, and Chi-Wai Chow
Opt. Express 32(5) 6814-6822 (2024)