Real time vital sign transmission using IEEE 802.15.7 VLC PHY-I transceiver

Visible Light Communication (VLC) Technology is the short range optical wireless communication technology using the light source such as LEDs for data transmission. The major advantage of VLC is that it causes no interference to RF-based devices and no bad effect to human body. Thus, this makes it possible to be used in intrinsically safe environment such as in a hospital. Moreover, it doesn't have the restriction likes a radio wave, VLC using a license free frequency bands. IEEE 802.15.7 VLC standard is one of the VLC standard. This standard consists of PHY I, II and III operating modes. In this paper, we first focus on analyzing PHY I with OOK modulation, which is targeted towards applications requiring data rate range from 11.67 kb/s to 100 kb/s with 200 kHz optical clock rate. Moreover, we propose the improvement of the real time vital sign transmission based on IEEE 802.15.7 VLC standard using PHY I operating modes for sending the vital signs data, which are temperature and heart rate. Compared with our previous system, there are improvements in many directions. The obvious improvement is the communication speed. Moreover, the transmission range is able to be increased by adding the VLC repeater.