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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Differential evolution-based optimal power allocation scheme for NOMA-VLC systems.

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    This study introduces a new power allocation method for non-orthogonal multiple access (NOMA) in visible light communication (VLC) systems. The proposed algorithms enhance system performance by balancing data rates and user fairness.

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    Area of Science:

    • Wireless Communication
    • Optical Networking

    Background:

    • Visible Light Communication (VLC) systems offer high bandwidth potential.
    • Non-Orthogonal Multiple Access (NOMA) enhances spectral efficiency in wireless systems.
    • Integrating NOMA in VLC presents challenges in power allocation for optimal performance.

    Purpose of the Study:

    • To develop a flexible downlink power allocation scheme for NOMA in VLC systems.
    • To achieve a tunable tradeoff between system sum rate and user fairness.
    • To provide optimal solutions for practical system configurations.

    Main Methods:

    • Formulation of two optimization problems: sum rate maximization with fairness guarantee and fairness maximization with sum rate guarantee.
    • Mathematical derivation and optimization analysis based on threshold discussions.
    • Proposal of two distinct algorithms for power allocation.

    Main Results:

    • Numerical simulations demonstrate the effectiveness of the proposed algorithms.
    • The algorithms outperform conventional schemes in key performance metrics.
    • Verified improvements in sum rate, user fairness, and coverage probability.

    Conclusions:

    • The proposed power allocation scheme effectively balances sum rate and user fairness in NOMA-VLC systems.
    • The developed algorithms offer practical solutions for optimizing system performance.
    • This research contributes to the advancement of efficient visible light communication technologies.