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Related Concept Videos

Light Acquisition02:16

Light Acquisition

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Unmanned-aerial-vehicle based optical camera communication system using light-diffusing fiber and rolling-shutter

Yun-Han Chang, Shang-Yen Tsai, Chi-Wai Chow

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    A novel light-diffusing fiber on an unmanned-aerial-vehicle (UAV) creates a wide field-of-view (FOV) optical camera communication (OCC) system. This system achieves 3.6 kbit/s data rates, overcoming challenges in UAV-assisted optical wireless communication (OWC).

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    Area of Science:

    • Optical Wireless Communication
    • Aerial Robotics
    • Signal Processing

    Background:

    • Unmanned-aerial-vehicle (UAV) assisted optical wireless communication (OWC) systems require wide field-of-view (FOV) and receiver (Rx) tilting angle support.
    • Existing systems face limitations in FOV and adaptability to UAV movement.

    Purpose of the Study:

    • To develop and demonstrate a light-diffusing fiber equipped UAV for a large FOV optical camera communication (OCC) system.
    • To enhance data transmission capacity and decoding in UAV-assisted OWC.

    Main Methods:

    • Utilized a bendable, lightweight light-diffusing fiber as an extended light source for the UAV.
    • Implemented a rolling-shutter mechanism with complementary-metal-oxide-semiconductor (CMOS) image sensors for pixel-row-by-pixel-row signal extraction.
    • Employed Long-short-term-memory neural networks (LSTM-NN) to improve rolling-shutter decoding of the thin light-diffusing fiber signal.

    Main Results:

    • The light-diffusing fiber effectively acted as an
    • omnidirectional optical antenna
    • providing wide FOVs.
    • Achieved a data rate of 3.6 kbit/s.
    • Met the pre-forward error correction bit-error-rate (pre-FEC BER) threshold of 3.8 × 10-3.

    Conclusions:

    • The proposed light-diffusing fiber UAV system offers a viable solution for large FOV OWC.
    • The combination of rolling-shutter and LSTM-NN significantly enhances data transmission in this context.
    • This technology holds promise for robust and high-capacity aerial optical communication.