Performance of Spatial Diversity DCO-OFDM in a Weak Turbulence Underwater Visible Light Communication Channel

Hongyan Jiang, Hongbing Qiu, Ning He, Wasiu Popoola, Zahir Ahmad, Sujan Rajbhandari

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Abstract

The performance of underwater visible light communication (UVLC) system is severely affected by absorption, scattering and turbulence. In this paper, we study the performance of spectral efficient DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) in combination with the transceiver spatial diversity in turbulence channel. Based on the approximation of the weighted sum of lognormal random variables (RVs), we derived a theoretical exact bit error rate (BER) for DCO-OFDM systems with spatial diversity. The simulation results are compared with the analytical prediction, confirming the validity of the analysis. It is shown that spatial diversity can effectively reduce the turbulence-induced channel fading. The obtained results can be useful for designing, predicting and evaluating the DCO-OFDM UVLC system in a weak oceanic turbulence condition.
Original languageEnglish
Pages (from-to)(In-Press)
Number of pages1
JournalJournal of Lightwave Technology
Volume(In-Press)
Early online date3 Jan 2020
DOIs
Publication statusE-pub ahead of print - 3 Jan 2020

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Keywords

  • underwater visible light communications (UVLC)
  • Spatial Diversity
  • OFDM
  • turbulence mitigation

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