Using pre-distorted PAM-4 signal and parallel resistance circuit to enhance the passive solar cell based visible light communication

Hao Yu Wang, Jhao Ting Wu, Chi Wai Chow*, Yang Liu, Chien Hung Yeh, Xin Lan Liao, Kun Hsien Lin, Wei Liang Wu, Yi Yuan Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Using solar cell (or photovoltaic cell) for visible light communication (VLC) is attractive. Apart from acting as a VLC receiver (Rx), the solar cell can provide energy harvesting. This can be used in self-powered smart devices, particularly in the emerging “Internet of Things (IoT)” networks. Here, we propose and demonstrate for the first time using pre-distortion pulse-amplitude-modulation (PAM)-4 signal and parallel resistance circuit to enhance the transmission performance of solar cell Rx based VLC. Pre-distortion is a simple non-adaptive equalization technique that can significantly mitigate the slow charging and discharging of the solar cell. The equivalent circuit model of the solar cell and the operation of using parallel resistance to increase the bandwidth of the solar cell are discussed. By using the proposed schemes, the experimental results show that the data rate of the solar cell Rx based VLC can increase from 20 kbit/s to 1.25 Mbit/s (about 60 times) with the bit error-rate (BER) satisfying the 7% forward error correction (FEC) limit.

Original languageEnglish
Pages (from-to)245-249
Number of pages5
JournalOptics Communications
Volume407
DOIs
StatePublished - 15 Jan 2018

Keywords

  • Free space communication
  • Light emitting diode (LED)
  • Optical communications
  • Solar cell
  • MOBILE COMMUNICATIONS
  • PERFORMANCE
  • OFDM

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