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Optimization of ultraviolet communication links based on finite difference stochastic approximation.

C Hakan Arslan, Fikadu T Dagefu, Terrence J Moore

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    Summary

    This study introduces a new method for optimizing ultraviolet (UV) communication links in challenging non-line-of-sight (NLOS) environments. The approach enhances signal strength by intelligently adjusting transmitter and receiver pointing directions without prior location knowledge.

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    Area of Science:

    • Optical Communications
    • Wireless Communication Systems
    • Signal Processing

    Background:

    • Ultraviolet (UV) communication offers unique advantages for covert, ground-to-ground transmissions, particularly in complex non-line-of-sight (NLOS) environments.
    • Optimizing node pointing directions is crucial for maximizing UV link performance in unknown NLOS scenarios.

    Purpose of the Study:

    • To develop a novel steering optimization approach for UV communication nodes.
    • To enable simultaneous optimization of transmitter (Tx) and receiver (Rx) pointing directions without prior environmental knowledge.

    Main Methods:

    • Proposed a Finite Difference Stochastic Approximation (FDSA) based steering optimization algorithm.
    • Conducted parametric analysis using Monte Carlo channel simulations.
    • Performed experimental validation using custom-designed UV Tx and Rx gimbal systems.

    Main Results:

    • The proposed FDSA approach effectively optimizes Tx and Rx pointing directions in unknown NLOS UV channels.
    • Parametric analysis identified key algorithmic parameters for performance.
    • Experimental results demonstrated significant increases in received photon count, validating the approach's utility and efficiency.

    Conclusions:

    • The novel FDSA steering optimization method is effective for enhancing UV communication link performance in challenging NLOS conditions.
    • The approach provides a practical solution for optimizing pointing directions without requiring node location or orientation data.
    • This work contributes to the advancement of robust and efficient UV communication systems.