Abstract In this paper, power domain non-orthogonal multiple access (NOMA) is introduced in underwater visible light communication (UVLC) to improve the spectrum efficiency and the sum transmission rate. A NOMA-UVLC system employing two LEDs with different colors is designed to improve the propagation efficiency, by bearing different information on different carriers. We experimentally investigate the BER performance of the system in air and water environment, respectively. The results demonstrate that the proposed NOMA system works better in underwater environment than in air environment. The total transmission rate in underwater environment achieves 117.4 Mb/s when employing red/blue LEDs in the proposed system, and 93.9 Mb/s when employing red/green LEDs in the proposed system, with a transmission distance of 1 m.

中文翻译：

---

NOMA在水下可见光通信系统中的实验研究

摘要 本文在水下可见光通信(UVLC)中引入功率域非正交多址(NOMA)，以提高频谱效率和总传输速率。采用两个不同颜色 LED 的 NOMA-UVLC 系统旨在通过在不同载体上承载不同信息来提高传播效率。我们分别实验研究了系统在空气和水环境中的 BER 性能。结果表明，所提出的 NOMA 系统在水下环境中比在空气环境中工作得更好。在建议系统中使用红/蓝 LED 时，水下环境中的总传输速率达到 117.4 Mb/s，在建议系统中使用红/绿 LED 时，总传输速率达到 93.9 Mb/s，传输距离为 1 m。