Indoor localisation using white LEDs

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Indoor localisation using white LEDs

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© The Institution of Engineering and Technology
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Energy efficient white LEDs are increasingly being used for indoor lighting but unlike conventional lighting, the intensity of the light emitted by white LEDs can be modulated at high frequencies. Described is a novel positioning technique based on transmitting signals with known sinusoidal components from a number of LEDs. The receiver uses the resultant optical signal at the receiver photodiode to calculate the receiver position. Proof of concept experiments show that white LEDs designed for indoor lighting can be used as the transmitters. The modulation bandwidth of white LEDs is large enough to give a range of localisation that is compatible with typical indoor applications.

Inspec keywords: optical transmitters; modulation; navigation; lighting; photodiodes; energy conservation; optical signal detection; LED lamps; optical receivers

Other keywords: proof of concept experiments; light emitting diode; receiver photodiode; optical signal receiver; signal transmission; indoor localisation; modulation bandwidth; indoor lighting; sinusoidal components; energy efficient white LED; positioning technique

Subjects: Optical communication equipment; Photoelectric devices; Modulation and coding methods; Signal detection; Lighting; Light emitting diodes

References

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      • Roberts, R., Gopalakrishan, P., Rathi, S.: `Visible light positioning: automotive use case', 2010 IEEE Vehicular Networking Conf., (VNC 2010), December 2010, Los Alamitos, CA, USA, IEEE Computer Society.
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      • Hann, S., Kim, J.H., Jung, S.Y., Park, C.S.: `White LED ceiling lights positioning systems for optical wireless indoor applications', 2010 36th IEEE European Conf. and Exhibition on Optical Communication, (ECOC 2010), September 2010, Torino, Italy.
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