Title :
Brightness Control Methods for Illumination and Visible-Light Communication Systems
Author :
Sugiyama, Hidemitsu ; Haruyama, Shinichiro ; Nakagawa, Masao
Author_Institution :
Keio Univ., Yokohama
Abstract :
We have developed two brightness control methods for illumination and visible-light communication systems. One method is pulse width modulation (PWM), the other is changing modulation depth. Using these proposed methods, we can achieve both dimmer i.e. brightness control and wireless communication at the same time. We discussed the relationship between PWM frequency, LED brightness, and communication performance. The results show that we can control brightness from 0% to 87.5% when we use PWM and data transmission possible when PWM frequency is high enough. Brightness can be controlled from 0% to 100% and communication performance is better than that of PWM when we change modulation depth.
Keywords :
brightness; light emitting diodes; lighting control; optical communication; optical variables control; pulse width modulation; radio networks; telecommunication control; LED brightness; PWM; brightness control methods; illumination visible-light communication systems; pulse width modulation; wireless communication; Brightness; Communication system control; Control systems; Data communication; Frequency; Light emitting diodes; Lighting; Pulse width modulation; Space vector pulse width modulation; Wireless communication;
Conference_Titel :
Wireless and Mobile Communications, 2007. ICWMC '07. Third International Conference on
Conference_Location :
Guadeloupe
Print_ISBN :
0-7695-2796-5
Electronic_ISBN :
0-7695-2796-5
DOI :
10.1109/ICWMC.2007.26
