Design of visible light communication system for maintaining uniform data rate

Jiun Yu Sung, Wan Feng Lin, Yu Fu Wu, Chi Wai Chow, Chien Hung Yeh*

*Corresponding author for this work

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

1 Scopus citations

Abstract

Light-emitting diode (LED) is gradually replacing the fluorescent lamp for lighting. Higher modulation bandwidth of LEDs makes the additional application of visible light communication (VLC) possible. Every location of a VLC system should be provided by equal data rate for smooth communication. However, locations away from the LED lamp have less power. These low-power locations have lower signal-to-noise ratio (SNR); and hence lower data rate can be achieved. For achieving high capacity VLC, strategies should be adequately provided to mitigate this problem. Moreover, for some real-time continuous applications, such as video and voice, latency reduction plan should also be considered. In this paper, an orthogonal frequency-division multiplexing access (OFDMA) based system was proposed to solve the above problem. Because we do not use time-division multiplexing access (TDMA) based system, the latency issue can be reduced. The OFDMA based system is also beneficial for large scale operation because the user bandwidth is not reduced by TDM mechanism. Signal-to-noise-plus-interference ratio (SNIR) distribution of the VLC system is designed to ensure uniform and optimal system capacity. Discrete multi-tone (DMT) is used for this VLC system. The DMT subcarriers are bit-loaded depending on the LED frequency response. More subcarriers are allocated for communication at low SNIR locations. Hence, nearly equal data rate can be provided everywhere. Demonstration of 17 Mb/s/LED data rate was provided.

Original languageEnglish
Title of host publicationNovel Optical Systems Design and Optimization XVII
EditorsArthur J. Davis, G. Groot Gregory
PublisherSPIE
ISBN (Electronic)9781628412208
DOIs
StatePublished - 1 Jan 2014
Event17th Conference of Novel Optical Systems Design and Optimization - San Diego, United States
Duration: 17 Aug 201419 Aug 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9193
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference17th Conference of Novel Optical Systems Design and Optimization
CountryUnited States
CitySan Diego
Period17/08/1419/08/14

Keywords

  • Access
  • Indoor communication
  • Light-emitting diode (LED)
  • Orthogonal frequency-division multiplexing (OFDM)
  • Visible light communication (VLC)

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    Sung, J. Y., Lin, W. F., Wu, Y. F., Chow, C. W., & Yeh, C. H. (2014). Design of visible light communication system for maintaining uniform data rate. In A. J. Davis, & G. G. Gregory (Eds.), Novel Optical Systems Design and Optimization XVII [919316] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9193). SPIE. https://doi.org/10.1117/12.2060585