In this paper, we for the first time propose and experimentally demonstrate a fairness-aware hybrid non-orthogonal multiple access/orthogonal frequency division multiple access (NOMA/OFDMA) scheme for practical bandlimited multi-user visible light communication (VLC) systems. The proposed fairness-aware hybrid NOMA/OFDMA scheme using discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) modulation can efficiently guarantee both the fairness of users within each user pair and the fairness of different user pairs. Specifically, an interleaved subcarrier multiplexing approach is proposed to mitigate user pair unfairness caused by the low-pass frequency response of bandlimited VLC systems, and a two-dimension (2D) power allocation strategy is further proposed to ensure both the fairness of users within each user pair and the fairness of user pairs with different channel conditions. Experimental results show that, in a bandlimited four-user VLC system applying the proposed fairness-aware hybrid NOMA/OFDMA scheme, the transmission distance at a target bit error rate (BER) of 3.8 × 10⁻³ can be extended by 12.3% in comparison to that employing the conventional hybrid NOMA/OFDMA scheme.

中文翻译：

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用于带限多用户 VLC 系统的公平感知混合 NOMA/OFDMA

在本文中，我们首次提出并实验证明了一种用于实际带限多用户可见光通信 (VLC) 系统的公平感知混合非正交多址/正交频分多址 (NOMA/OFDMA) 方案。所提出的公平感知混合 NOMA/OFDMA 方案使用离散傅立叶变换扩展正交频分复用 (DFT-S-OFDM) 调制，可以有效地保证每个用户对内用户的公平性和不同用户对的公平性。具体而言，提出了一种交错子载波复用方法来减轻由带限 VLC 系统的低通频率响应引起的用户对不公平性，并进一步提出了二维（2D）功率分配策略，以保证每个用户对内用户的公平性和不同信道条件下用户对的公平性。实验结果表明，在应用所提出的公平感知混合 NOMA/OFDMA 方案的带限四用户 VLC 系统中，传输距离在目标误码率 (BER) 为 3.8 × 10与采用传统的混合 NOMA/OFDMA 方案相比，^-3可以扩展 12.3%。