Ergodic capacity and error performance of spatial diversity UWOC systems over generalized gamma turbulence channels

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

In this paper, we study the ergodic capacity (EC) and average bit error rate (BER) of spatial diversity underwater wireless optical communications (UWOC) over the generalized gamma (GG) fading channels using quadrature amplitude modulation (QAM) direct current-biased optical orthogonal frequency division multiplexing (DCO-OFDM). We derive closed-form expressions of the EC and BER for the spatial diversity UWOC with the equal gain combining (EGC) at receivers based on the approximation of the sum of independent identical distributed (i.i.d) GG random variables (RVs). Numerical results of EC and BER for QAM DCO-OFDM spatial diversity systems over GG fading channels are presented. The numerical results are shown to be closely matched by the Monte Carlo simulations, verifying the analysis. The study clearly shows the adverse effect of turbulence on the EC & BER and advantage of EGC to overcome the turbulence effect.

Original languageEnglish
Article number127476
JournalOptics Communications
Volume505
Early online date24 Sept 2021
DOIs
Publication statusPublished - 15 Feb 2022

Keywords / Materials (for Non-textual outputs)

  • Average bit error rate
  • Ergodic capacity
  • Generalized gamma
  • OFDM
  • Spatial diversity
  • Underwater wireless optical communications

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