Title

MISO UCA Beamforming Dimmable LED System for Indoor Positioning

Document Type

Article

Publication Date

1-2014

Publication Source

Sensors

Volume

14

Issue

2

Inclusive pages

2362-2378

DOI

10.3390/s140202362

Publisher

M D P I AG

Place of Publication

Switzerland

ISBN/ISSN

1424-8220

Peer Reviewed

yes

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

Disciplines

Digital Communications and Networking

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