Volume 49 Issue 2
Mar.  2020
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Jiang Hongyan, Qiu Hongbing, He Ning, Wu Yue, Zahir Ahmad, Sujan Rajbhandari. Optical OFDM spatial diversity system in lognormal fading UVLC channels[J]. Infrared and Laser Engineering, 2020, 49(2): 0203008-0203008. doi: 10.3788/IRLA202049.0203008
Citation: Jiang Hongyan, Qiu Hongbing, He Ning, Wu Yue, Zahir Ahmad, Sujan Rajbhandari. Optical OFDM spatial diversity system in lognormal fading UVLC channels[J]. Infrared and Laser Engineering, 2020, 49(2): 0203008-0203008. doi: 10.3788/IRLA202049.0203008

Optical OFDM spatial diversity system in lognormal fading UVLC channels

doi: 10.3788/IRLA202049.0203008
  • Received Date: 2019-10-11
  • Rev Recd Date: 2019-11-21
  • Publish Date: 2020-03-02
  • Underwater visible light communication (UVLC) is an attractive solution to achieve high-speed and large-data transmission but challenging due to the impairments induced by absorption, scattering and turbulence. To combat effects of multipath and fading for the UVLC system over turbulence channels, optical orthogonal frequency division multiplexing (O-OFDM) schemes with the transceiver spatial diversity were proposed, which employed equal gain combining (EGC) at the receiver side. Underwater path loss was calculated by a generalized Lambertian formula, and the fading induced by weak turbulence was modelled as a lognormal-distribution random variable. Based on the channel model and Monte Carlo (MC) simulation, the bit error ratio (BER) performance for quadrature-amplitude modulation (QAM) asymmetrically clipped optical OFDM (ACO-OFDM) and DC-biased optical OFDM (DCO-OFDM) systems in the channel with and without turbulence was evaluated. Furthermore, the diversity gain was estimated for different diversity orders and scintillation indexes. The results demonstrate that the diversity scheme with EGC is an effective measure to reduce the effect of turbulence and could be useful for designing, predicting, and evaluating the performance of O-OFDM UVLC system in a weak oceanic turbulence condition.
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    [7] Dissanayake S D, Armstrong J. Comparison of ACO-OFDM, DCO-OFDM and ADO-OFDM in IM/DD systems[J]. Journal of Lightwave Technology, 2013, 31(7):1063-1072.
    [8] Rajbhandari S, Mckendry J J D, Herrnsdorf J, et al. A review of gallium nitride LEDs for multi-gigabit-per-second visible light data communications[J]. Semiconductor Science and Technology, 2017, 32(2):023001.
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    [10] Jia Kejun, Jin Bin, Hao Li, et al. Performance analysis of DCO-OFDM and ACO-OFDM systems in indoor visible light communications[J]. Chinese Journal of Lasers, 2017, 44(8):0806003. (in Chinese)
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Optical OFDM spatial diversity system in lognormal fading UVLC channels

doi: 10.3788/IRLA202049.0203008
  • 1. School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China;
  • 2. Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin 541004, China;
  • 3. School of Computing, Electronics and Mathematics, Coventry University, Coventry CV1 2JH, UK

Abstract: Underwater visible light communication (UVLC) is an attractive solution to achieve high-speed and large-data transmission but challenging due to the impairments induced by absorption, scattering and turbulence. To combat effects of multipath and fading for the UVLC system over turbulence channels, optical orthogonal frequency division multiplexing (O-OFDM) schemes with the transceiver spatial diversity were proposed, which employed equal gain combining (EGC) at the receiver side. Underwater path loss was calculated by a generalized Lambertian formula, and the fading induced by weak turbulence was modelled as a lognormal-distribution random variable. Based on the channel model and Monte Carlo (MC) simulation, the bit error ratio (BER) performance for quadrature-amplitude modulation (QAM) asymmetrically clipped optical OFDM (ACO-OFDM) and DC-biased optical OFDM (DCO-OFDM) systems in the channel with and without turbulence was evaluated. Furthermore, the diversity gain was estimated for different diversity orders and scintillation indexes. The results demonstrate that the diversity scheme with EGC is an effective measure to reduce the effect of turbulence and could be useful for designing, predicting, and evaluating the performance of O-OFDM UVLC system in a weak oceanic turbulence condition.

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