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Developing a comprehensive model for underwater MIMO OCC system.

Ehsan Hamidnejad, Asghar Gholami

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    |October 20, 2023
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    Summary

    Optical camera communication (OCC) uses multiple-input-multiple-output (MIMO) to boost data rates. This study models underwater OCC (UOCC) and shows how LED spacing impacts inter-pixel interference (IPI), improving signal-to-interference-plus-noise ratio (SINR).

    Area of Science:

    • Optical Wireless Communication
    • Underwater Optical Communication
    • Signal Processing

    Background:

    • Optical Camera Communication (OCC) offers spatial modulation but suffers from low data rates due to camera frame rates.
    • Multiple-Input-Multiple-Output (MIMO) techniques are employed to enhance OCC data rates.
    • Inter-Pixel Interference (IPI) is a significant challenge in MIMO-based OCC systems, affecting image sensor performance.

    Purpose of the Study:

    • To develop a comprehensive model for Underwater Optical Camera Communication (UOCC) systems.
    • To experimentally investigate the impact of Inter-Pixel Interference (IPI) on UOCC performance.
    • To analyze the relationship between LED spacing, LED diameter, and signal-to-interference ratio (SIR) in UOCC.

    Main Methods:

    • Development of a UOCC system model.

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  • Experimental verification of the UOCC model's performance under IPI conditions.
  • Comparative analysis of Signal-to-Interference-plus-Noise Ratio (SINR) and Signal-to-Interference Ratio (SIR).

    • Main Results:

    • Coastal water links (1-6 m) showed a Signal-to-Interference Ratio (SIR) gain of approximately 2.5 dB.
    • Harbor water channels (0.4-1.4 m) exhibited an SIR gain increase from ~2 dB to ~5 dB when LED spacing was 2D compared to 0.5D.
    • The study quantifies the performance gains achievable by optimizing LED spacing in UOCC systems.

    Conclusions:

    • The proposed UOCC model accurately represents system performance under IPI.
    • Optimizing the distance between LEDs relative to their diameter is crucial for mitigating IPI and enhancing SIR in UOCC.
    • This research provides valuable insights for designing robust and efficient underwater optical communication systems.