Code division-based sensing of illumination contributions in solid-state lighting systems

Authors:
Jean-Paul M. G. Linnartz;Lorenzo Feri;Hongming Yang;Sel B. Colak;Tim C. W. Schenk
Affiliations:
Philips Research Eindhoven, AE, Eindhoven, The Netherlands and Department of Electrical Engineering, Eindhoven University of Technology, MB, Eindhoven, The Netherlands;Philips Research Eindhoven, AE, Eindhoven, The Netherlands;Philips Research Eindhoven, AE, Eindhoven, The Netherlands and Department of Electrical Engineering, Eindhoven University of Technology, MB, Eindhoven, The Netherlands;Philips Research Eindhoven, AE, Eindhoven, The Netherlands;Philips Research Eindhoven, AE, Eindhoven, The Netherlands
Venue:
IEEE Transactions on Signal Processing
Year:
2009

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Abstract

Light-emitting diodes (LEDs) have emerged as a prime candidate for the light source of the future. To enable easy user interaction with a future lighting system consisting of many LEDs, this paper proposes a method to accurately measure and estimate the local light contributions of a large set of LEDs. This is enabled through tagging the light of each LED with an unique identifier. To this end, we propose a new family of modulation and multiple access schemes in this paper, named code-time division multiple access-pulse position modulation (CTDMA-PPM) and CTDMA-pulse width modulation (CTDMA-PWM). These schemes satisfy illumination constraints, are compatible with the commonly used PWM dimming of LEDs, and meet the multi-signal separation requirements for simultaneous measurement of illumination strengths. Based on these modulation methods, the paper develops algorithms to estimate. illumination. Finally, performance analyses show that even for a very large number of LEDs, the sensing performance of the proposed system satisfies the requirements up to an adequate range.