DocumentCode :
1257660
Title :
Enhanced Illumination Sensing Using Multiple Harmonics for LED Lighting Systems
Author :
Yang, Hongming ; Schenk, Tim C W ; Bergmans, Jan W M ; Pandharipande, Ashish
Author_Institution :
Dept. of Electr. Eng., Eindhoven Univ. of Technol., Eindhoven, Netherlands
Volume :
58
Issue :
11
fYear :
2010
Firstpage :
5508
Lastpage :
5522
Abstract :
This paper considers frequency division multiplexing (FDM) based illumination sensing in light emitting diode (LED) lighting systems. The purpose of illumination sensing is to identify the illumination contributions of spatially distributed LEDs at a sensor location, within a limited response time. In the FDM scheme, LEDs render periodical illumination pulse trains at different frequencies with prescribed duty cycles. The problem of interest is to estimate the amplitudes of the individual illumination pulse trains. In our previous work, an estimation approach was proposed using the fundamental frequency component of the sensor signal. The number of LEDs that can be supported by this estimation approach is limited to around 100 LEDs at a response time of 0.1 s. For future LED lighting systems, however, it is desirable to support many more LEDs. To this end, in this paper, we seek to exploit multiple harmonics in the sensor signal. We first derive upper limits on the number of LEDs that can be supported in the presence of frequency offsets and noise. Thereafter, we propose a low complexity successive estimation approach that effectively exploits the multiple harmonics. It is shown that the number of the LEDs can be increased by a factor of at least five, compared to the estimation approach using only the fundamental frequency component, at the same estimation error.
Keywords :
LED lamps; frequency division multiplexing; lighting; FDM; LED lighting systems; LED render periodical illumination pulse trains; enhanced illumination sensing; frequency division multiplexing; frequency offsets; light emitting diode lighting systems; multiple harmonics; sensor signal; spatially distributed LED; time 0.1 s; Delay; Estimation; Estimation error; Frequency division multiplexing; Frequency estimation; Harmonic analysis; Interference; LED lamps; Light emitting diodes; Lighting; Parameter estimation; Permission; Pulse width modulation; Cramér–Rao bound; frequency division multiplexing; illumination sensing; light emitting diode lighting systems; successive estimation;
fLanguage :
English
Journal_Title :
Signal Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1053-587X
Type :
jour
DOI :
10.1109/TSP.2010.2059018
Filename :
5524025
Link To Document :
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