Investigation of phosphor-LED lamp for real-time half-duplex wireless VLC system. (5th April 2016)

• Record Type: Journal Article
• Authors: Yeh, Chien-Hung; Chow, Chi-Wai; Chen, Hsing-Yu; Liu, Yen-Liang; Hsu, Dar-Zu
• Is Part Of: Journal of optics. Volume 18:Number 6(2016:Jun.)
• Publication Date: 2016-04-05
• Subjects: illuminance -- LED -- visible light communication (VLC); Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8978/18/6/065701
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: In this investigation, a 71.3 to 148.4 Mbit s −1 white phosphor-LED visible light communication (VLC) system is proposed and demonstrated under the practical transmission length of 140 to 210 cm. Here, a commercial white-light LED lamp with five cascaded phosphor-LED chips is utilized for illumination and communication simultaneously. In the measurement, we utilize the optical orthogonal frequency division multiplexing quadrature amplitude modulation (OFDM-QAM) with bit-loading algorithm and propose an optimal bias-tee circuit design to improve the modulation bandwidth from 1 MHz to 27 MHz. Moreover, a blue optical filter is not used on the client side. Finally, to realize and demonstrate the real-time transmission performance in the proposed LED VLC system, a commercial OFDM-based digital signal processor (DSP) chip is utilized on the LED lighting side and client side, respectively. Hence, the proposed real-time half-duplex VLC transmission could achieve the 70 Mbit s −1 downstream and upstream data throughputs, under a practical transmission length of 200 cm.