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<p>In the realm of visible light communication (VLC), high-speed data transfer relies on intensity modulation/direct detection (IM/DD) based on asymmetrically clipped optical orthogonal frequency division multiplexing ACO-OFDM which in turn based on discrete Hartley transform (DHT) instead of discrete Fourier transform (DFT) since DHT works with signals with real values, it does not require Hermitian symmetry (HS). It works with a much simpler real mapper to give the same performance. However, this technique faces a challenge in the form of a high peak-to-average power ratio (PAPR) due to the scaling up of the transmitted signals’ peaks resulting from the modulation of OFDM signals. In this paper, the PAPR is reduced by using a hybrid scheme, which combines the selective mapping (SLM) method and Walsh-Hadamard transform (WHT), as a precoder of the DHT-based ACO-OFDM system. WHT is used as a precoder to reduce the superposition of the transmitted signals and thus reduce the PAPR. Moreover, the performance of this hybrid scheme is further improved by aggregating SLM together for further PAPR reduction without affecting the BER performance in the VLC system. This section presents a comparison between the new scheme and the conventional DHT-based ACO-OFDM in the VLC system. The comparison tries to validate the benefits and efficiency of the new scheme and the existing approach.</p>

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A hybrid technique for reducing PAPR in ACO-OFDM systems based on DHT

  • 期刊论文

  • 发表日期：

    2025年6月21日

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  • Mohammed K. Mohaisen,
  • Suha S. Mardan,
  • Waladdin M. Shaher

摘要

In the realm of visible light communication (VLC), high-speed data transfer relies on intensity modulation/direct detection (IM/DD) based on asymmetrically clipped optical orthogonal frequency division multiplexing ACO-OFDM which in turn based on discrete Hartley transform (DHT) instead of discrete Fourier transform (DFT) since DHT works with signals with real values, it does not require Hermitian symmetry (HS). It works with a much simpler real mapper to give the same performance. However, this technique faces a challenge in the form of a high peak-to-average power ratio (PAPR) due to the scaling up of the transmitted signals’ peaks resulting from the modulation of OFDM signals. In this paper, the PAPR is reduced by using a hybrid scheme, which combines the selective mapping (SLM) method and Walsh-Hadamard transform (WHT), as a precoder of the DHT-based ACO-OFDM system. WHT is used as a precoder to reduce the superposition of the transmitted signals and thus reduce the PAPR. Moreover, the performance of this hybrid scheme is further improved by aggregating SLM together for further PAPR reduction without affecting the BER performance in the VLC system. This section presents a comparison between the new scheme and the conventional DHT-based ACO-OFDM in the VLC system. The comparison tries to validate the benefits and efficiency of the new scheme and the existing approach.