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In optical wireless communication (OWC), OFDM serves as a commonly adopted multi-carrier modulation method, but an efficient OFDM scheme that balances performance and complexity is lacking. Therefore, this paper proposes a flexible-group triple-layer hybrid optical OFDM (FTHO-OFDM) system, combining a third-layer optical OFDM (O-OFDM) signal with pulse-amplitude-modulated discrete multitone (PAM-DMT) and asymmetrically clipped O-OFDM (ACO-OFDM) for enhancing spectral efficiency. FTHO-OFDM adjusts the number of subcarriers based on channel conditions and fully utilizes the real components of even-indexed subcarriers, improving spectrum efficiency in contrast to hybrid ACO-OFDM (HACO-OFDM). With three layers, FTHO-OFDM offers equivalent spectral efficiency to layered ACO-OFDM (LACO-OFDM) while reducing complexity and latency. Simulation results show that FTHO-OFDM maintains similar bit error rate (BER) performance to that of LACO-OFDM while requiring less electrical bit energy over noise power, indicating better power efficiency.

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Flexible-Group Triple-Layer Hybrid Optical OFDM for Optical Wireless Communication

  • 会议论文

  • 发表日期：

    2026年

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  • Baolong Li,
  • Chengcheng Qian,
  • Chengtao Wang,
  • Yiding Li

摘要

In optical wireless communication (OWC), OFDM serves as a commonly adopted multi-carrier modulation method, but an efficient OFDM scheme that balances performance and complexity is lacking. Therefore, this paper proposes a flexible-group triple-layer hybrid optical OFDM (FTHO-OFDM) system, combining a third-layer optical OFDM (O-OFDM) signal with pulse-amplitude-modulated discrete multitone (PAM-DMT) and asymmetrically clipped O-OFDM (ACO-OFDM) for enhancing spectral efficiency. FTHO-OFDM adjusts the number of subcarriers based on channel conditions and fully utilizes the real components of even-indexed subcarriers, improving spectrum efficiency in contrast to hybrid ACO-OFDM (HACO-OFDM). With three layers, FTHO-OFDM offers equivalent spectral efficiency to layered ACO-OFDM (LACO-OFDM) while reducing complexity and latency. Simulation results show that FTHO-OFDM maintains similar bit error rate (BER) performance to that of LACO-OFDM while requiring less electrical bit energy over noise power, indicating better power efficiency.