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Curved OLED-based NLOS optical camera communications links.

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    This study introduces curved organic light-emitting diodes (OLEDs) for non-line-of-sight optical camera communication (NLOS-OCC). The research demonstrates improved signal-to-noise ratio (SNR) and reception success rates in indoor environments.

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    Area of Science:

    • Optical Communications
    • Wireless Communication Technologies
    • Organic Electronics

    Background:

    • Non-line-of-sight (NLOS) communication links are crucial for overcoming signal blockage.
    • Optical Camera Communication (OCC) offers a potential wireless communication solution.
    • Organic Light-Emitting Diodes (OLEDs) are increasingly used in display and lighting applications.

    Purpose of the Study:

    • To experimentally demonstrate, for the first time, the use of a curved OLED as a transmitter (Tx) in an NLOS-OCC link.
    • To evaluate the performance of this NLOS-OCC scheme by analyzing signal-to-noise ratio (SNR) and reception success rates (R).
    • To investigate the impact of key parameters like exposure time, gain value, transmission frequency, and distance on the system's performance.

    Main Methods:

    • A novel NLOS-OCC system was designed utilizing a curved OLED as the transmitter and a camera as the receiver.
    • Signal-to-noise ratio (SNR) analysis was conducted using a binary classification procedure based on a Gaussian mixture model.
    • The influence of photographic and communication parameters (exposure time, gain, frequency, distance) on SNR and reception rates was systematically evaluated.

    Main Results:

    • The study successfully demonstrated the feasibility of using curved OLEDs in NLOS-OCC links.
    • SNR analysis using a Gaussian mixture model was performed for OLED-based NLOS-OCC for the first time.
    • It was shown that the effect of gain value on SNR concerning distance is minimal, based on a pixel illumination model.
    • For a 2m NLOS-OCC link with a wall reflector, an increase in transmission frequency to 600 Hz, exposure time to 1000-1500 µs, and gain to 25-45 dB resulted in a 1 dB SNR improvement and a 4% increase in reception rates (83-87%).

    Conclusions:

    • Curved OLEDs are a viable and effective transmitter component for indoor NLOS-OCC systems.
    • The proposed system achieves reliable data transmission even in non-line-of-sight conditions.
    • The findings provide valuable insights into optimizing NLOS-OCC performance by tuning key operational parameters.