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Related Experiment Video

Updated: Nov 24, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Performance-enhanced indoor MIMO-OFDM visible light communications using individual/joint CAZAC precoding techniques.

Mengru Chen, Huimin Lu, Danyang Chen

    Applied Optics
    |December 28, 2020
    PubMed
    Summary
    This summary is machine-generated.

    New precoding schemes enhance visible light communication (VLC) systems. Constant amplitude zero auto-correlation (CAZAC) precoding improves signal quality and reduces errors in indoor MIMO-OFDM VLC, outperforming systems without precoding.

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    Area of Science:

    • Optical Communications
    • Signal Processing
    • Wireless Communication

    Background:

    • Visible Light Communication (VLC) systems offer high bandwidth and security.
    • Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) enhances VLC capacity.
    • High Peak-to-Average Power Ratio (PAPR) and non-uniform Signal-to-Noise Ratio (SNR) degrade VLC performance.

    Purpose of the Study:

    • To propose efficient individual and joint Constant Amplitude Zero Auto-Correlation (CAZAC) precoding schemes for indoor MIMO-OFDM VLC systems.
    • To analyze the impact of these precoding schemes on PAPR, SNR, and Bit Error Rate (BER).
    • To compare the performance of individual and joint CAZAC precoding in both symmetric and asymmetric MIMO configurations.

    Main Methods:

    • Development of individual and joint CAZAC precoding algorithms.
    • Simulation of a 3x3 MIMO-OFDM VLC system with symmetric and asymmetric structures.
    • Evaluation of PAPR, SNR, and BER performance metrics.

    Main Results:

    • Both individual and joint CAZAC precoding schemes effectively reduce PAPR.
    • Precoding ensures uniform SNR across data subcarriers, significantly improving performance.
    • Similar performance gains were observed for individual and joint CAZAC precoding in symmetric MIMO setups.
    • Joint CAZAC precoding offers greater benefits in asymmetric MIMO VLC systems, despite higher complexity.

    Conclusions:

    • CAZAC precoding schemes are highly effective in enhancing MIMO-OFDM VLC system performance.
    • The choice between individual and joint CAZAC precoding depends on the MIMO configuration (symmetric vs. asymmetric) and acceptable implementation complexity.
    • These precoding techniques offer a viable solution for improving the quality and reliability of VLC systems.