Overcoming bandwidth limitation of LED by using multilevel differential PAM in VLC

S. H. Yang, D. H. Kwon, S. K. Han

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


We propose a novel modulation and de-modulation method to reduce the complexity of transmitter and receiver which is named multilevel differential pulse amplitude modulation (MD-PAM). The proposed modulation scheme transmits different PAM signals with same amplitude and unit time delay using different multiple LED chips. Optical signals from each LED chips are superposed during through the optical wireless channel and directly detected at the single optical receiver. Received signal is demodulated using signal power difference which is changed by light intensity. As a result, we experimentally confirmed that 100-Mbit/s transmission was possible using two LED chips which have 25MHz modulation bandwidth, respectively.

Original languageEnglish
Title of host publicationPIERS 2015 Prague - Progress In Electromagnetics Research Symposium, Proceedings
PublisherElectromagnetics Academy
Number of pages5
ISBN (Electronic)9781934142301
Publication statusPublished - 2015

Publication series

NameProgress in Electromagnetics Research Symposium
ISSN (Print)1559-9450
ISSN (Electronic)1931-7360

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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