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<p>Within the sixth generation of mobile communication technology (6G), visible light communication (VLC) holds potential due to its license-free spectral resources, providing high-speed data rates and widespread access in abundant special scenarios. ln communication scenarios where vehicles such as automobiles and ships change channels due to movement, adaptive modulation schemes are more conducive to improving channel utilization than fixed schemes. Classic probabilistic amplitude shaping combined with the distribution matcher provides an approach to flexible rates. However, the high complexity and unsuitability for concentric ring constellations hinder its use in VLC. In this paper, we propose a flexible-rate strategy for the mid-long-distance and dynamically changing VLC system utilizing the proposed time-domain sub-constellation probabilistic shaping (TDPCS) modulation. The proposed TDPCS modulation generates coded constellation symbols with Maxwell-Boltzmann (MB) probabilistic distribution based on the designed amplitude and phase-shift keying (APSK) sub-constellations arranged in time-domain frames. When the signal-to-noise ratio (SNR) varies, the transmission rate could be adapted as the sub-frame length changes. We design three orders of TDPCS APSK signals, theoretically analyze and experimentally evaluate their performance compared to the regular scheme with uniformly distributed APSK modulation in 100-m VLC transmission. Based on the obtained characteristics in both linear and non-linear channels, we demonstrate the feasibility of achieving flexible-rate access in dynamic distances and its superiority in rate compared to the regular modulation scheme. A net data rate (NDR) of 6.67 Gbit/s is achieved using TDPCS 32 APSK at 100 m, while a NDR of 8.1 Gbit/s is achieved at 10 m using the TDPCS 64 APSK. These rates represent a significant overall capacity improvement of up to 23.5% compared to regular modulation schemes. The results demonstrate the potential of TDPCS for VLC, especially in dynamically changing scenarios.</p>

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A flexible-rate mid-long-distance visible light communication system utilizing time-domain sub-constellation probabilistic shaping modulation

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Guojin Qin,
  • Chaoxu Chen,
  • Li Yao,
  • Junwen Zhang,
  • Chao Shen,
  • Jianyang Shi,
  • Nan Chi

摘要

Within the sixth generation of mobile communication technology (6G), visible light communication (VLC) holds potential due to its license-free spectral resources, providing high-speed data rates and widespread access in abundant special scenarios. ln communication scenarios where vehicles such as automobiles and ships change channels due to movement, adaptive modulation schemes are more conducive to improving channel utilization than fixed schemes. Classic probabilistic amplitude shaping combined with the distribution matcher provides an approach to flexible rates. However, the high complexity and unsuitability for concentric ring constellations hinder its use in VLC. In this paper, we propose a flexible-rate strategy for the mid-long-distance and dynamically changing VLC system utilizing the proposed time-domain sub-constellation probabilistic shaping (TDPCS) modulation. The proposed TDPCS modulation generates coded constellation symbols with Maxwell-Boltzmann (MB) probabilistic distribution based on the designed amplitude and phase-shift keying (APSK) sub-constellations arranged in time-domain frames. When the signal-to-noise ratio (SNR) varies, the transmission rate could be adapted as the sub-frame length changes. We design three orders of TDPCS APSK signals, theoretically analyze and experimentally evaluate their performance compared to the regular scheme with uniformly distributed APSK modulation in 100-m VLC transmission. Based on the obtained characteristics in both linear and non-linear channels, we demonstrate the feasibility of achieving flexible-rate access in dynamic distances and its superiority in rate compared to the regular modulation scheme. A net data rate (NDR) of 6.67 Gbit/s is achieved using TDPCS 32 APSK at 100 m, while a NDR of 8.1 Gbit/s is achieved at 10 m using the TDPCS 64 APSK. These rates represent a significant overall capacity improvement of up to 23.5% compared to regular modulation schemes. The results demonstrate the potential of TDPCS for VLC, especially in dynamically changing scenarios.