A simple and effective tracking scheme for visible light communication systems

Fulin Liu; Weibin Jiang; Xianqing Jin; Zhengyuan Xu

doi:10.1117/12.2521930

14 February 2019 A simple and effective tracking scheme for visible light communication systems

Fulin Liu, Weibin Jiang, Xianqing Jin, Zhengyuan Xu

Proceedings Volume 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018); 110481H (2019) https://doi.org/10.1117/12.2521930
Event: 17th International Conference on Optical Communications and Networks (ICOCN2018), 2018, Zhuhai, China

Abstract

Mobility is one of important issues for line-of-sight visible light communication (VLC). For a high-speed VLC system, the field of view (FOV) of the transceivers is very narrow for high optical gain at the receiver so that precise alignment between the transceivers is required. To enhance the mobility performance, in this paper, a simple and effective scheme of tracking light source is designed and experimentally demonstrated for practical VLC systems. To detect the target light source, a beacon light encoded with a low-frequency label signal is used along with the information light at the transmitter, whilst a high-speed camera with wide FOV is used for location detection by differentiating received images at the receiver. The detected signal of the light source location is then digitally processed to control a two-axis gimbal for auto-alignment between two transceivers. To mitigate the effects of ambient and interference lights, adaptive threshold and dynamic search window are used. A field-programmable gate array (FPGA)-based on-off keying (OOK) transceiver with the adaptive tracking function is developed for evaluation of the tracking performance. Experimental results show that with the proposed scheme 25 Mbps OOK transmission is successfully demonstrated at a bit error rate of < 10^-3 over a 3 m VLC link with the transmitter horizontally moving at a speed of 1m/s, which corresponds a tracking speed of >18°/s. The angular accuracy and latency of tracking the LED transmitter are < 0.02° and < 21 ms, respectively.

Citation Download Citation

Fulin Liu, Weibin Jiang, Xianqing Jin, and Zhengyuan Xu "A simple and effective tracking scheme for visible light communication systems", Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 110481H (14 February 2019); https://doi.org/10.1117/12.2521930

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