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Related Experiment Video

Updated: Sep 25, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Flipped superposed constellation design for MIMO visible-light communication systems.

Xinyue Guo, Yuansha Yuan, Yiheng Zhao

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    This study introduces a new superposed constellation for MIMO VLC systems, improving data rates and reducing distortion. The novel scheme enhances performance in optical channels, achieving higher transmission speeds with lower error rates.

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    Area of Science:

    • Optical Communications
    • Wireless Communication Technologies
    • Signal Processing

    Background:

    • Multiple-Input Multiple-Output (MIMO) Visible-Light Communication (VLC) systems offer multiplexing gains even in correlated channels.
    • Superposed constellation schemes are gaining attention for enhancing MIMO VLC performance.

    Purpose of the Study:

    • To propose a novel superposed constellation scheme for 2x2 MIMO VLC systems.
    • To improve power efficiency, reduce nonlinear distortion, and enhance Gray coding.
    • To achieve higher data rates and a wider dynamic voltage range.

    Main Methods:

    • A 2n-order Quadrature Amplitude Modulation (QAM) signal is created by superposing 4QAM and a processed 2n-2 order QAM signal.
    • An optimal offset, power normalization, and flipping strategy are employed for signal processing.
    • An algorithm for optimal offset calculation and received power derivation is proposed.

    Main Results:

    • The proposed scheme achieves an equal power ratio (1:1) between superposed signals, avoiding receiver power competition and transmitter nonlinear distortion.
    • Thorough Gray coding and improved received power due to signal correlation are demonstrated.
    • Simulations and experimental results show a lower Bit Error Rate (BER) and a larger dynamic range of driving peak-to-peak voltage.

    Conclusions:

    • The novel superposed constellation scheme significantly enhances the performance of 2x2 MIMO VLC systems.
    • The system achieves a maximum transmission rate of 3 Gb/s at a 7% pre-forward error correction BER threshold of 3.8 × 10-3.
    • This scheme offers a practical solution for high-speed, reliable visible-light communication.