Experimental Evaluation of LED-Based Wearable Transmitter for Optical Camera Communications Systems

In this paper, we experimentally demonstrate an optical camera communications (OCC) system for wearable light-emitting diode (LED) as the transmitter. Wearable devices are powerful tools for supporting Internet of Things (IoT) systems because of their sensing, processing, and communication capability. The term “wearable devices” refers to a wide range of products that can be integrated into clothing and accessories, thus allowing real-time data detection, storage, and exchange without human intervention. This paper presents the practical evaluation of an LED-based wearable transmitter for an OCC system to demonstrate its feasibility. In particular, an LED array attached to the body is modulated using on-off keying to transmit data via visible light, and a smartphone camera captures video of the user wearing the device while slightly moving in a static position in the room. Finally, the data is decoded from the video frames using an image processing algorithm that tracks the source and demodulates the signal.