Experimental Demonstration of Non-Hermitian Symmetry for DC-SC-FDM in UOWC Systems

Authors

  • Kidsanapong Puntsri Rajamangala University of Technology Isan, Khon Kaen Campus
  • Ekkaphol Khansalee Rajamangala University of Technology Isan, Khon Kaen Campus
  • Hanawa Masanori University of Yamanashi

DOI:

https://doi.org/10.4186/ej.2021.25.12.81

Keywords:

underwater communication systems, optical wireless communication, orthogonal frequency division multiplexing, high spectrum efficiency

Abstract

This study demonstrates the high spectrum efficiency of DC offset single-carrier frequency division multiplexing (DC-SC-FDM) for underwater optical wireless communications (UOWC). I and Q components were separately transmitted using dual lasers. As a result, the requirement of Hermitian symmetry is alleviated, and the computation time latency is reduced. The Gram–Schmidt orthogonalization procedure was adopted to address the I and Q orthogonality. The system comprises a 1024-point inverse fast Fourier transform (IFFT), a cyclic prefix of 32 samples, and a digital-to-analog converter (DAC) of 400 Msps, and laser diodes possess a wavelength of 553 nm with a power of 150 mW. The study includes real transmissions in a freshwater communication channel and reports experimental results. In addition, the bit error rate has been evaluated. The results show that at the forward error correction (FEC) limit, a communication distance of 10 m can be achieved. A peak-to-average power ratio reduction of 4.96 dB is reached.

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Author Biographies

Kidsanapong Puntsri

Department of Electronics and Telecommunication, Faculty of Engineering, Rajamangala University of Technology Isan, Khon Kaen Campus, Khon Kaen, 40000, Thailand

Ekkaphol Khansalee

Department of Electronics and Telecommunication, Faculty of Engineering, Rajamangala University of Technology Isan, Khon Kaen Campus, Khon Kaen, 40000, Thailand

Hanawa Masanori

Department of Electrical and Electronic Engineering, University of Yamanashi, Japan

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Published In
Vol 25 No 12, Dec 30, 2021
How to Cite
[1]
K. Puntsri, E. Khansalee, and H. Masanori, “Experimental Demonstration of Non-Hermitian Symmetry for DC-SC-FDM in UOWC Systems ”, Eng. J., vol. 25, no. 12, pp. 81-86, Dec. 2021.