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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Superposed constellation design for spatial multiplexing visible light communication systems.

Manh Le-Tran, Sunghwan Kim

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    This study enhances visible light communication (VLC) by optimizing signal constellations on light-emitting diodes (LEDs), improving symbol error rates. The new method focuses on constellation shape, not just power, for better performance in spatial multiplexing systems.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Wireless Technology

    Background:

    • Visible Light Communication (VLC) systems utilize light-emitting diodes (LEDs) for data transmission.
    • Nonlinearity in LEDs can degrade system performance.
    • Spatial multiplexing with superposed constellations is a technique to improve VLC systems.

    Purpose of the Study:

    • To enhance the minimum Euclidean distance (ED) of superposed signals in VLC systems.
    • To overcome the limitations of fixed sub-constellation shapes and power allocation strategies.
    • To improve the symbol error rate (SER) performance in VLC systems.

    Main Methods:

    • Optimizing sub-constellations at individual LEDs, rather than solely adjusting power ratios.
    • Utilizing intra-ED and inter-ED terms to simplify the optimization process.
    • Comparing the proposed constellation design scheme with conventional methods through simulations.

    Main Results:

    • The proposed constellation design significantly improves minimum ED values.
    • The new method demonstrates superior symbol error rate performance compared to conventional approaches.
    • The selection of pre-defined sub-constellation shapes plays a crucial role in optimization effectiveness.

    Conclusions:

    • Optimizing individual LED sub-constellations offers a more effective approach than fixed shapes and power allocation.
    • The proposed method provides a pathway to higher performance in spatial multiplexing VLC systems.
    • Careful selection of sub-constellation shapes is vital for maximizing performance gains.