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    Orbital angular momentum (OAM) beams filter solar noise in vertical free-space optical communication (FSO) downlinks. This method enhances mobile network coverage and capacity by ensuring a stable connection.

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    Area of Science:

    • Optical Communications
    • Wireless Networking
    • Signal Processing

    Background:

    • Free-space optical communication (FSO) offers network flexibility.
    • Vertical FSO links from aerial platforms can boost mobile network capacity and coverage.
    • Solar background noise poses a significant challenge to vertical FSO downlink channels.

    Purpose of the Study:

    • To propose and verify a novel method for mitigating solar background noise in vertical FSO downlinks.
    • To leverage orbital angular momentum (OAM) beams for improved signal transmission reliability.

    Main Methods:

    • Utilizing orbital angular momentum (OAM) beams for signal transmission.
    • Implementing OAM demodulation to selectively filter out solar background noise.
    • Modeling a vertical FSO downlink with OAM modulation and demodulation.

    Main Results:

    • Experimental verification demonstrated significant reduction of solar background noise.
    • The OAM demodulation effectively filtered sunlight, preserving the intended signal.
    • The proposed scheme proved feasible for vertical FSO channels.

    Conclusions:

    • OAM beam transmission is an effective solution for mitigating solar noise in vertical FSO systems.
    • This approach enhances the stability and reliability of mobile network coverage and capacity.
    • The study validates the practical application of OAM in challenging FSO environments.