| Title |
A Study on Error Correction of Signage 2×2 LED Tag ID signals to Charging Solar Pad on Smart Phone |
| Authors |
Jong-Yong Park ; Deok-Gun Woo ; Jae-Sang Cha |
| DOI |
http://doi.org/10.5207/JIEIE.2020.34.12.001 |
| Keywords |
Digital Signage; MATLAB; Shadow; Smart Phone; Solar Pad; Visual Light Communication |
| Abstract |
Digital signage has been widely spread for advertising and requires more interactions with customers. The adopted communication methods are limited by low-speed, low-capacity and also RF based communication system is vulnerable to security. Visible light communication can provide high-speed and large-capacity communication and improved security. By using a solar pad as a receiver, it solves the inconvenience that the photodiode must be positioned in line with visible light. This paper proposes a visual light communication system between a 2×2 LED Tag on a digital signage and a portable solar pad on a smart phone Depending on smart phone holding pattern, a shadow occurs by a finger and it causes communication errors. To solve this problem, I propose to use three channels as to transmit data and use one channel to transmits parity bits. This approach is verified to recover errors from fingers or palm on the solar pad. This allows signage to provide a more improved user experience to users through visible light communication. |