IEEE Photonics Journal (Jan 2015)

A Robust CDMA VLC System Against Front-End Nonlinearity

  • H. Qian,
  • S. C. Dai,
  • S. Zhao,
  • S. Z. Cai,
  • H. Zhang

DOI
https://doi.org/10.1109/JPHOT.2015.2472287
Journal volume & issue
Vol. 7, no. 5
pp. 1 – 9

Abstract

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The nonlinearity of a light-emitting diode (LED) limits the system performance of a visible light communications (VLC) system. Many nonlinearity mitigation methods have been studied. Recent technology advances in the micro-LED array have provided a simple alternative to deal with the system nonlinearity. In this paper, we study the approach of providing multiple access for the VLC system with the micro-LED array. A code-division multiple-access (CDMA) scheme that enables multiple access with variable data rate is proposed. In addition, the proposed system architecture is immune to the nonlinearity of the micro-LED array, thus providing optimal system performance. Simulations and laboratory experiments show the robustness and consistency of the proposed scheme.

Keywords