Investigation of phosphor-LED lamp for real-time half-duplex wireless VLC system

Chien Hung Yeh, Chi-Wai Chow, Hsing Yu Chen, Yen Liang Liu, Dar Zu Hsu

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

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.

Original languageEnglish
Article number065701
JournalJournal of Optics (United Kingdom)
Volume18
Issue number6
DOIs
StatePublished - 1 Jun 2016

Keywords

  • illuminance
  • LED
  • visible light communication (VLC)

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