Brightness Control Methods for Illumination and Visible-Light Communication Systems

Author

Sugiyama, Hidemitsu ; Haruyama, Shinichiro ; Nakagawa, Masao

Author_Institution

Keio Univ., Yokohama

fYear

2007

fDate

4-9 March 2007

Firstpage

78

Lastpage

78

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICWMC.2007.26

Filename

4138184