Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Turbulence-tolerant Manchester On-off Keying Transmission for Free-space Optical Communication

  • Qian-Wen Jing (School of Information Science and Engineering, Shenyang University of Technology) ;
  • Pei-Zheng Yu (School of Information Science and Engineering, Shenyang University of Technology) ;
  • Han-Lin Lv (School of Information Science and Engineering, Shenyang University of Technology) ;
  • Yanqing Hong (School of Information Science and Engineering, Shenyang University of Technology)
  • Received : 2023.03.21
  • Accepted : 2023.06.21
  • Published : 2023.08.25
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Abstract

We propose a turbulence-tolerant Manchester on-off keying (M-OOK) transmission for free-space optical (FSO) communication. At the transmitter end, a M-OOK signal featuring a spectrum with low-frequency components absent is modulated and transmitted into a turbulent channel. At the receiver end, a low-pass filter (LPF) -based adaptive-threshold decision (ATD) with LPF-extracted channel-state information (CSI) and a high-pass filter (HPF)-based fixed-threshold decision (FTD) are employed to compensate for the effects of turbulence, owing to the low-frequency spectral characteristics of the turbulent channel. The performance of LPF-based ATD and HPF-based FTD are evaluated for various cutoff frequencies for the LPF and HPF. Besides, the proposed M-OOK transmission is compared to conventional non-return-to-zero OOK (NRZ-OOK) for different data rates. The proposed technique is verified in simulation. The simulation results show that the proposed M-OOK detection with optimized cutoff frequencies of LPF and HPF has better bit-error-rate (BER) performance compared to NRZ-OOK, and it is close to the theoretical ATD with the knowledge of precise CSI under various degrees of turbulence effects.

Keywords

Acknowledgement

Major Scientific and Technological Innovation Project of Shandong Province (2019JZZY010128); Natural Science Foundation of Liaoning Province (20180520022).

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