Optimal Power Allocation Scheme Based on Multi-Factor Control in Indoor NOMA-VLC Systems

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Abstract
In order to overcome the limitation of narrow modulation bandwidth on the performance in visible light communication (VLC) systems, non-orthogonal multiple access (NOMA) is applied to the downlink VLC networks in this paper to improve the sum rate performance effectively. We first propose an optimal power allocation strategy which is based on the multi-factor control (MFOPA), aiming to maximize the total system capacity subject to ensuring all users’ quality of service (Qos) and fairness as well as illumination requirements. Analytical results indicate that the proposed MFOPA could provide higher system sum rate and better user fairness as well as guarantee the Qos and eye safety of each user at the same time when compared to static power allocation (SPA) and gain ratio power allocation (GRPA) schemes, especially in high demand for signal-to-interference-plus-noise ratio (SINR). What’s more, considering the residual interference may exist during the successive interference cancellation (SIC) at the receiver, namely imperfect SIC, the interference cancellation factor is also taken into account in MFOPA strategy. Numerical results are shown to demonstrate the robustness and effectiveness of MFOPA in NOMA-VLC when the residual interference remains.
Funding Information
  • National Natural Science Foundation of China (61172080, 61771357)

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