A MISO UCA Beamforming Dimmable LED System for Indoor Positioning

Sensors

Attaphongse Taparugssanagorn¹  Siwaruk Siwamogsatham¹ 

[1] Wireless Information Security and Eco-Electronics Research Unit/National Electronics and Computer Technology Center, Bangkok 12120, Thailand; E-Mail:

关键词: indoor location awareness;    optical wireless communications;    adaptive beamforming;   

DOI  :  10.3390/s140202362

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.