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<p>Zero-Tail Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing (ZT DFT-s-OFDM) has emerged as a promising alternative to conventional OFDM in radio-frequency (RF) communication systems. ZT DFT-s-OFDM has recently gained attention for its ability to lower peak-to-average power ratio (PAPR), suppress out-of-band radiation, and enhance bit error rate (BER) performance compared to conventional OFDM. Although its benefits are well-documented in radio-frequency applications, its use in visible light communication (VLC) systems remains largely unexplored. In this study, two new VLC waveforms are presented: ZT DFT-s Asymmetrically Clipped Optical OFDM (ZT DFT-s ACO-OFDM) and ZT DFT-s Direct Current Biased Optical OFDM (ZT DFT-s DCO-OFDM). Both designs incorporate flexible zero-tail sequences to smooth symbol boundaries and lower the PAPR of respective waveforms. Performance assessment was carried out through MATLAB-based simulations over additive white Gaussian noise (AWGN) channels and multipath optical channels generated using the Ceiling Bounce model. Simulation outcomes reveal consistent BER improvements and PAPR reductions ranging from 2 dB to 3.5 dB, with higher DC bias levels further improving PAPR in the ZT DFT-s DCO-OFDM scheme. These gains come with only a modest rise in computational complexity, indicating that the proposed designs are promising candidates for high-performance VLC implementations.</p>

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A novel ZT DFT-s optical OFDM waveform design for visible light communications

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Kübra Budancamanak,
  • Ali Özen

摘要

Zero-Tail Discrete Fourier Transform-spread Orthogonal Frequency Division Multiplexing (ZT DFT-s-OFDM) has emerged as a promising alternative to conventional OFDM in radio-frequency (RF) communication systems. ZT DFT-s-OFDM has recently gained attention for its ability to lower peak-to-average power ratio (PAPR), suppress out-of-band radiation, and enhance bit error rate (BER) performance compared to conventional OFDM. Although its benefits are well-documented in radio-frequency applications, its use in visible light communication (VLC) systems remains largely unexplored. In this study, two new VLC waveforms are presented: ZT DFT-s Asymmetrically Clipped Optical OFDM (ZT DFT-s ACO-OFDM) and ZT DFT-s Direct Current Biased Optical OFDM (ZT DFT-s DCO-OFDM). Both designs incorporate flexible zero-tail sequences to smooth symbol boundaries and lower the PAPR of respective waveforms. Performance assessment was carried out through MATLAB-based simulations over additive white Gaussian noise (AWGN) channels and multipath optical channels generated using the Ceiling Bounce model. Simulation outcomes reveal consistent BER improvements and PAPR reductions ranging from 2 dB to 3.5 dB, with higher DC bias levels further improving PAPR in the ZT DFT-s DCO-OFDM scheme. These gains come with only a modest rise in computational complexity, indicating that the proposed designs are promising candidates for high-performance VLC implementations.