This article analyses the performance of a power-domain nonorthogonal multiple access (PD-NOMA)-based visible light communication (VLC) system in the Internet of Things (IoT) network. It specifically investigates the various VLC system channel models in indoor and outdoor IoT network settings. To enhance the existing analysis of the PD-NOMA-based VLC system performance, this study first analyses the distribution function of the received signals and the system noise in real-world environments. Second, it explores the impact of environmental noise on the system’s bit error rate (BER) under indoor Gaussian channels and derives the theoretical BER formulas for both the indoor and outdoor settings. Finally, theoretical symbol error rate (SER) formulas are derived for the three-device PD-NOMA-VLC system in both the indoor and outdoor environments. Numerical simulations demonstrate a close match between the theoretical analysis and simulation results, particularly in high signal-to-noise ratio (SNR) conditions.

中文翻译：

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基于NOMA的VLC系统在不同物联网网络环境下的性能分析


本文分析了物联网 (IoT) 网络中基于功率域非正交多址 (PD-NOMA) 的可见光通信 (VLC) 系统的性能。它专门研究了室内和室外物联网网络设置中的各种 VLC 系统通道模型。为了加强对基于 PD-NOMA 的 VLC 系统性能的现有分析，本研究首先分析了现实环境中接收信号和系统噪声的分布函数。其次，探讨了室内高斯信道下环境噪声对系统误码率（BER）的影响，并推导了室内和室外环境下的理论误码率公式。最后，推导了室内和室外环境下三设备 PD-NOMA-VLC 系统的理论符号错误率 (SER) 公式。数值模拟证明了理论分析和模拟结果之间的紧密匹配，特别是在高信噪比 (SNR) 条件下。