Communications and Sensing of Illumination Contributions in a Power LED Lighting System

— In recent years, LED technology emerged as a prime candidate for the future illumination light source, due to high energy efficiency and long life time. In addition, LEDs offer a superior flexibility in terms of colors and shapes, which leads to a potentially infinite variety of available light patterns. In order to create these patterns via easy user interaction, we need to sense the local light contribution of each LED. This measurement could be enabled through tagging of the light of each LED with unique embedded IDs. To this end, we propose a new modulation and multiple access scheme, named as codetime division multiple access - pulse position modulation (CTDMAPPM): a form of PPM which is keyed according to a spreading sequence, and in which the duty cycle is subject to pulse width modulation (PWM) according to the required lighting setting. Our scheme considers illumination constraints in addition to the communication requirements and, to our best knowledge, it has not been...

• Type: Conference
• Year: 2008
• Where: ICC
• Authors: Jean-Paul M. G. Linnartz, Lorenzo Feri, Hongming Yang, Sel B. Colak, Tim C. W. Schenk
• Keywords: Communications, ICC 2008, Modulation, Modulation Method, Multiple Access Schemes