Jianhui Chen: A Fine Beam Tracking and Alignment System for Underwater VLC Links


Alder Lecture Theatre, Nucleus Bldg


Thursday, May 30, 2024 - 13:00 to 14:00


Visible light communication (VLC) has garnered significant attention due to its wide range of applications and compatibility with existing infrastructure. Various modulation schemes and diversity methods have been explored through simulations and experimental studies under different channel conditions. VLC is also seen as a complement to radio frequency (RF) communication, forming a hybrid VLC/RF system that enhances Internet of Things (IoT) applications by offering higher data rates, better load balancing, and increased coverage areas.

Misalignment poses a significant challenge in VLC links, disrupting the trajectory of collimated light beams and causing continual beam displacement at the receiver end. This talk introduces a robust real-time beam tracking system that enables the receiver to accurately follow the beam. Results show that this tracking system effectively mitigates misalignment, achieving an average signal-to-noise ratio (SNR) enhancement of approximately 40 dB in both free-space and turbulent underwater channel conditions.


Jianhui Chen earned a bachelor's degree from Soochow University and a master's degree from Manchester University. He is currently in his third year of a Ph.D. program at the Institute for Imaging, Data, and Communications (IDCOM), under the supervision of Professor Wasiu Popoola. Jianhui's research focuses on enhancing the robustness of visible light communication (VLC) channels. He has investigated and compared the performance of frequency-shift keying (FSK) and frequency-shift continuous modulation (FSCM) against the popular on-off keying (OOK) modulation method in various underwater optical wireless communication environments, such as turbid and turbulent water channels. Additionally, he is working on more efficient and cost-effective solutions to address displacement issues in VLC.

Jianhui Chen

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Tao Xu

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