Visible Light Communication (VLC) has attracted significant attention over the past decade. Although numerous research studies have been performed to improve the data rate of VLC links, an important fact has been largely neglected: human bodies that host VLC receivers could block their Line-of-Sight (LOS) downlinks , and thus, degrade the system performance greatly. In this paper, we propose a system that can significantly improve the robustness for VLC networks by avoiding performance degradation due to blockage. A novel user-in-the-loop mechanism is designed in which users (including human bodies and VLC receivers) are guided by the network to rotate themselves to improve the system performance and the individual user experience. Both our simulation and experimental results demonstrate that the proposed user-in-the-loop mechanism can improve the system throughput and user fairness on average by 48% and 14%, respectively. For individual users, the average gain in throughput can reach up to 135%. Furthermore, to make the system more practical, two lightweight heuristics are designed and implemented which can achieve similar gains while reducing the computational complexity by 99%.

中文翻译：

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通过用户轮换利用VLC网络中的阻塞

在过去的十年中，可见光通信（VLC）引起了极大的关注。尽管已经进行了许多研究来提高VLC链接的数据速率，但是一个重要的事实在很大程度上被忽略了：承载VLC接收器的人体可能会阻塞其视线（LOS）下行链路 ，从而大大降低系统性能。在本文中，我们提出了一种系统，该系统可以通过避免因阻塞而导致的性能下降来显着提高VLC网络的鲁棒性。设计了一种新颖的“用户在环”机制，其中用户（包括人体和VLC接收器）由网络引导以使自己旋转以提高系统性能和个人用户体验。我们的仿真和实验结果均表明，所提出的“用户在环”机制可以分别将系统吞吐量和用户公平性分别提高48％和14％。对于单个用户，吞吐量的平均增幅可以达到135％。此外，为了使系统更实用，