標題: Investigation of phosphor-LED lamp for real-time half-duplex wireless VLC system
作者: Yeh, Chien-Hung
Chow, Chi-Wai
Chen, Hsing-Yu
Liu, Yen-Liang
Hsu, Dar-Zu
光電工程學系
Department of Photonics
關鍵字: illuminance;LED;visible light communication (VLC)
公開日期: Jun-2016
摘要: 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.
URI: http://dx.doi.org/10.1088/2040-8978/18/6/065701
http://hdl.handle.net/11536/133955
ISSN: 2040-8978
DOI: 10.1088/2040-8978/18/6/065701
期刊: JOURNAL OF OPTICS
Volume: 18
Issue: 6
Appears in Collections:Articles