Enabling Multiple Access in Visible Light Communication Using Liquid Crystal Displays: A Proof-of-Concept Study
Enabling Multiple Access in Visible Light Communication Using Liquid Crystal Displays: A Proof-of-Concept Study
复制标题
DOI：
10.3390/electronics9050826
复制
发表时间：
2020-05-01
期刊：
影响因子：
2.9
通讯作者：
Ashok, Ashwin
中科院分区：
文献类型：
--
作者：
Rahman, M. D. Rashed;Adedara, Kehinde;Ashok, Ashwin
光信号的方向性为可见光通信（VLC）中光链路的有效空间复用提供了机会。VLC中的空间复用可以实现多个发光发射机的多址通信。传统的使用光感受器的VLC系统设计要求每个光发射器至少有一个接收光探测器元件，从而限制了VLC总是需要一个光发射器与光感受器元件对。在本文中，我们提出，设计和评估了一种新的VLC架构，该架构可以使用仅使用单个光电二极管的光感受器接收器实现多路接收。这种新颖的设计包括一个基于液晶显示（LCD）的快门系统，该系统可以自动控制和选择接收来自多个发射器的光束。我们评估了两个发光二极管（LED）发射器在单个光电二极管上进行多路访问的可行性，以及使用误码率（BER）和分组误码率（PER）指标的通信链路性能。我们通过概念验证实现的实验和基于跟踪的评估揭示了在单个光电二极管上接收多个LED的可行性。我们进一步在受控移动环境下评估系统，以验证接收器在LED发射器改变位置时的适应性。
The directionality of optical signals provides an opportunity for efficient space reuse of optical links in visible light communication (VLC). Space reuse in VLC can enable multiple-access communication from multiple light emitting transmitters. Traditional VLC system design using photo-receptors requires at least one receiving photodetector element for each light emitter, thus constraining VLC to always require a light-emitter to light-receptor element pair. In this paper, we propose, design and evaluate a novel architecture for VLC that can enable multiple-access reception using a photoreceptor receiver that uses only a single photodiode. The novel design includes a liquid-crystal-display (LCD) based shutter system that can be automated to control and enable selective reception of light beams from multiple transmitters. We evaluate the feasibility of multiple access on a single photodiode from two light emitting diode (LED) transmitters and the performance of the communication link using bit-error-rate (BER) and packet-error-rate (PER) metrics. Our experiment and trace based evaluation through proof-of-concept implementation reveals the feasibility of multiple LED reception on a single photodiode. We further evaluate the system in controlled mobile settings to verify the adaptability of the receiver when the LED transmitter changes position.