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Sensors 2014, 14(2), 2362-2378; doi:10.3390/s140202362
Article

A MISO UCA Beamforming Dimmable LED System for Indoor Positioning

1,* , 1
 and
2
1 Wireless Information Security and Eco-Electronics Research Unit/National Electronics and Computer Technology Center, Bangkok 12120, Thailand 2 Radio Frequency (RF) Communications, Purdue University, Fort Wayne, IN 46805, USA
* Author to whom correspondence should be addressed.
Received: 22 October 2013 / Revised: 18 December 2013 / Accepted: 10 January 2014 / Published: 29 January 2014
(This article belongs to the Section Physical Sensors)
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Abstract

The use of a multiple input single output (MISO) transmit beamforming system using dimmable light emitting arrays (LEAs) in the form of a uniform circular array (UCA) of transmitters is proposed in this paper. With this technique, visible light communications between a transmitter and a receiver (LED reader) can be achieved with excellent performance and the receiver’s position can be estimated. A hexagonal lattice alignment of LED transmitters is deployed to reduce the coverage holes and the areas of overlapping radiation. As a result, the accuracy of the position estimation is better than when using a typical rectangular grid alignment. The dimming control is done with pulse width modulation (PWM) to obtain an optimal closed loop beamforming and minimum energy consumption with acceptable lighting.
Keywords: indoor location awareness; optical wireless communications; adaptive beamforming indoor location awareness; optical wireless communications; adaptive beamforming
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Taparugssanagorn, A.; Siwamogsatham, S.; Pomalaza-Ráez, C. A MISO UCA Beamforming Dimmable LED System for Indoor Positioning. Sensors 2014, 14, 2362-2378.

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