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Statistical distribution of intensity fluctuations for underwater wireless optical channels in the presence of air bubbles

Jamali, M. V ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1109/IWCIT.2016.7491626
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2016
  4. Abstract:
  5. In this paper, we experimentally investigate the statistical distribution of intensity fluctuations for underwater wireless optical channels under different channel conditions, namely fresh and salty underwater channels with and without air bubbles. To do so, we first measure the received optical signal with a large number of samples. Based on the normalized acquired data the channel coherence time and the fluctuations probability density function (PDF) are obtained for different channel scenarios. Our experimental results show that salt attenuates the received signal while air bubbles mainly introduce severe intensity fluctuations. Moreover, we observe that log-normal distribution precisely fits the acquired data PDF for scintillation index (σ2I) values less than 0.1, while Gamma-Gamma and K distributions aptly predict the intensity fluctuations for σ2I > 1. Since neither of these distributions are capable of predicting the received irradiance for 0.1 < σ2I < 1, we propose a combination of an exponential and a log-normal distributions to perfectly describe the acquired data PDF for such regimes of scintillation index
  6. Keywords:
  7. Channel coherence time ; Fading statistical distribution ; Information theory ; Normal distribution ; Optical communication ; Reliability analysis ; Scintillation ; Channel coherence ; Intensity fluctuations ; Log-normal distribution ; Probability density function (pdf) ; Statistical distribution ; Underwater channels ; Underwater wireless optical communications ; Wireless optical channels ; Probability density function
  8. Source: IWCIT 2016 - Iran Workshop on Communication and Information Theory, 3 May 2016 through 4 May 2016 ; 2016 ; 9781509019229 (ISBN)
  9. URL: http://ieeexplore.ieee.org/document/7491626