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<p>Underwater optical wireless communication (UOWC) systems represent a significant advancement in marine communication technologies, offering high data rates and enhanced bandwidth compared to traditional acoustic methods. However, in coherent-detection orthogonal-frequency-division-multiplexing (OFDM) UOWC system one of the key challenges is the high peak-to-average power ratio (PAPR) of the transmitted optical signals. Using coherent-detection OFDM technology, a UOWC-system has been established employing 450&#xa0;nm blue laser-diode (LD). A hybrid method, Hadamard-transform combined with clipping and square-rooting technique is proposed to diminish the effect of high PAPR. 18 Gbps data-rate have been transmitted over 31.5&#xa0;m, 29&#xa0;m, and 27&#xa0;m distances for 32, 64 and 128 QAM signals and very good Q-values have been obtained utilizing our proposed-system. Employing this technique PAPR-values are decreased by 6.4 dB for 32-QAM, 6.2 dB for 64-QAM and 5.9 dB for 128-QAM than original OFDM-signals. The percentages of improvements are 48.4%, 45.5% and 42.4% respectively for 32, 64 and 128-QAM compared to OFDM-signal. The potential of this technique for mitigating the effects of high PAPR in UOWC systems is analyzed and shows a significant improvement of PAPR values compared to original OFDM-signal. So, our proposed system for PAPR reduction can significantly improve the system’s energy efficiency, extend the communication-range and minimizes error-rates. This system is suitable for PAPR reduction with a focus on real-time implementation of UOWC-system.</p>

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PAPR reduction for enhanced performance in coherent-detection based underwater wireless communication-system employing Hadamard-transform combined with clipping and square-rooting technique

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Amlan Das,
  • Nilanjana Sarkar,
  • Barnali Pal,
  • Rahul Mukherjee,
  • Manish Dev Sharma,
  • Ardhendu Sekhar Patra

摘要

Underwater optical wireless communication (UOWC) systems represent a significant advancement in marine communication technologies, offering high data rates and enhanced bandwidth compared to traditional acoustic methods. However, in coherent-detection orthogonal-frequency-division-multiplexing (OFDM) UOWC system one of the key challenges is the high peak-to-average power ratio (PAPR) of the transmitted optical signals. Using coherent-detection OFDM technology, a UOWC-system has been established employing 450 nm blue laser-diode (LD). A hybrid method, Hadamard-transform combined with clipping and square-rooting technique is proposed to diminish the effect of high PAPR. 18 Gbps data-rate have been transmitted over 31.5 m, 29 m, and 27 m distances for 32, 64 and 128 QAM signals and very good Q-values have been obtained utilizing our proposed-system. Employing this technique PAPR-values are decreased by 6.4 dB for 32-QAM, 6.2 dB for 64-QAM and 5.9 dB for 128-QAM than original OFDM-signals. The percentages of improvements are 48.4%, 45.5% and 42.4% respectively for 32, 64 and 128-QAM compared to OFDM-signal. The potential of this technique for mitigating the effects of high PAPR in UOWC systems is analyzed and shows a significant improvement of PAPR values compared to original OFDM-signal. So, our proposed system for PAPR reduction can significantly improve the system’s energy efficiency, extend the communication-range and minimizes error-rates. This system is suitable for PAPR reduction with a focus on real-time implementation of UOWC-system.