MirrorVLC: Optimal Mirror Placement for Multi-Element VLC Networks
MirrorVLC: Optimal Mirror Placement for Multi-Element VLC Networks
复制标题
DOI：
10.1109/twc.2022.3182013
复制
发表时间：
2020-12
影响因子：
10.4
通讯作者：
Sifat Ibne Mushfique;Ahmad Alsharoa;M. Yuksel
中科院分区：
文献类型：
--
作者：
Sifat Ibne Mushfique;Ahmad Alsharoa;M. Yuksel
可见光通信(VLC)是一项快速发展的技术，可以补充现有的基于射频(RF)的无线通信系统。由于发光二极管(LED)的可用性不断提高，VLC可以在解决日益严重的频谱稀缺问题方面发挥巨大作用。与其他通信系统相比，VLC的最大优势之一是它可以同时提供照明和数据通信，而不需要任何额外的部署。虽然在当今，以惊人的速度向所有用户提供数据速率是必不可少的，但保持令人满意的照明分布水平也很重要。在本文中，我们提出了一种使用反射镜来提高室内多单元VLC系统架构的照明均匀性和吞吐量的新方法。在这种方法中，我们通过使用镜子将反射到墙上的LED光束重定向到较暗的点，从而提高了系统的信干噪比(SINR)和房间的整体照明均匀性。我们制定了一个联合优化问题，重点是最大化信干噪比，同时保持整个房间的合理照明均匀。提出了优化问题的两阶段解决方案：设计方案和通信方案。在优化设计中，我们提出了一个等效的二元线性优化方法，通过优化反射镜的位置和LED的发射功率来获得最佳的照明质量。然而，在通信问题中，我们的目标是使用基于最大化最小用户数据速率的公平效用度量来提高系统的吞吐量。由于通信问题的非凸性，我们提出了三种不同的启发式解决方案，并对它们的性能进行了分析。我们还表明，当采用镜面放置时，平均照度可提高约3倍，平均吞吐量可提高约4倍，这是一个显着的性能提升。
Visible Light Communication (VLC) is a rapidly growing technology which can supplement the current radio-frequency (RF) based wireless communication systems. VLC can play a huge part in solving the ever-increasing problem of spectrum scarcity because of the growing availability of Light Emitting Diodes (LEDs). One of the biggest advantages of VLC over other communication systems is that it can provide illumination and data communication simultaneously without needing any extra deployment. Although it is essential to provide data rate at a blazing speed to all the users nowadays, maintaining a satisfactory level in the distribution of lighting is also important. In this paper, we present a novel approach of using mirrors to enhance the illumination uniformity and throughput of an indoor multi-element VLC system architecture. In this approach, we improve the Signal-to-Interference plus Noise Ratio (SINR) of the system and overall illumination uniformity of the room by redirecting the reflected LED beams on the walls to darker spots with the use of mirrors. We formulate a joint optimization problem focusing on maximization of the SINR while maintaining a reasonable illumination uniformity across the room. We propose a two-stage solution of the optimization problem: design solution and communication solution. In the design optimization, we formulate an equivalent binary linear optimization to achieve the best illumination quality by optimizing the mirror placements and the LEDs’ transmit powers. In the communication problem, however, we aim to improve the throughput of the system using a fair utility metric based on maximizing the minimum user’s data rate. Due to non-convexity of the communication problem, we propose three different heuristic solutions and analyze their performance. We also show that about threefold increase in average illumination and fourfold increase in average throughput can be achieved when the mirror placement is applied which is a significant performance improvement.