In this work, we investigate the transmission sum rate as well as the secrecy sum rate of indoor visible light communication (VLC) networks for mobile devices with the power domain non-orthogonal multiple access (NOMA) transmission, where multiple legitimate users are equipped with photodiodes (PDs). We introduce a body blockage model of the legitimate users as well as the eavesdropper to focus on the case where the communications from transmitting light-emitting diodes (LEDs) to receiving devices are blocked by the bodies of receiving users. Furthermore, in order to improve the secrecy without any knowledge of the channel state information (CSI) of the eavesdropper, a novel LED arrangement is introduced to reduce the overlapping area covered by LED units supporting different users. We also propose two LED operation strategies, called simple and smart LED linking, and evaluate their performance against the conventional broadcasting in terms of transmission sum rate and secrecy sum rate. Through computer simulations, the superiority of our proposed strategies is demonstrated.

翻译：本文研究了采用功率域非正交多址接入（NOMA）传输的室内可见光通信（VLC）网络中移动设备的传输和速率以及保密和速率，其中多个合法用户配备光电探测器（PD）。我们引入合法用户及窃听者的身体遮挡模型，重点关注从发射发光二极管（LED）到接收设备的通信被接收用户身体遮挡的情况。此外，为在无窃听者信道状态信息（CSI）的情况下提升保密性，我们提出一种新型LED布局，以减小支持不同用户的LED单元覆盖的重叠区域。我们还提出了两种LED运行策略，即简单LED链接与智能LED链接，并以传统广播方案为基准，评估其在传输和速率与保密和速率方面的性能。通过计算机仿真，验证了我们所提策略的优越性。