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基于分组LED阵列发射器的物联网滚动快门式MIMO方案的光学相机通信

Optical Camera Communications for IoT-Rolling-Shutter Based MIMO Scheme with Grouped LED Array Transmitter.

作者信息

Teli Shivani Rajendra, Matus Vicente, Zvanovec Stanislav, Perez-Jimenez Rafael, Vitek Stanislav, Ghassemlooy Zabih

机构信息

Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka, 16627 Prague, Czech Republic.

Institute for Technological Development and Innovation in Communications, Universidad de Las Palmas de Gran Canaria, 35001 Las Palmas, Spain.

出版信息

Sensors (Basel). 2020 Jun 13;20(12):3361. doi: 10.3390/s20123361.

DOI:10.3390/s20123361
PMID:32545751
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7348962/
Abstract

In optical camera communications (OCC), the provision of both flicker-free illumination and high data rates are challenging issues, which can be addressed by utilizing the rolling-shutter (RS) property of the image sensors as the receiver (Rx). In this paper, we propose an RS-based multiple-input multiple-output OCC scheme for the Internet of things (IoT) application. A simplified design of multi-channel transmitter (Tx) using a 7.2 × 7.2 cm small 8 × 8 distributed light emitting diode (LED) array, based on grouping of LEDs, is proposed for flicker-free transmission. We carry out an experimental investigation of the indoor OCC system by employing a Raspberry Pi camera as the Rx, with RS capturing mode. Despite the small area of the display, flicker-free communication links within the range of 20-100 cm are established with data throughput of 960 to 120 bps sufficient for IoT. A method to extend link spans up to 1.8 m and the data throughput to 13.44 kbps using different configurations of multi-channel Tx is provided. The peak signal-to-noise ratio of ~14 and 16 dB and the rate of successfully received bits of 99.4 and 81% are measured for the shutter speeds of 200 and 800 µs for a link span of 1 m, respectively.

摘要

在光学相机通信（OCC）中，提供无闪烁照明和高数据速率是具有挑战性的问题，通过利用图像传感器的卷帘快门（RS）特性作为接收器（Rx）可以解决这些问题。在本文中，我们提出了一种基于RS的多输入多输出OCC方案，用于物联网（IoT）应用。基于发光二极管（LED）分组，提出了一种使用7.2×7.2 cm小型8×8分布式LED阵列的多通道发射器（Tx）简化设计，以实现无闪烁传输。我们使用树莓派相机作为Rx，采用RS捕获模式，对室内OCC系统进行了实验研究。尽管显示屏面积较小，但在20 - 100 cm范围内建立了无闪烁通信链路，数据吞吐量为960至120 bps，足以满足物联网需求。提供了一种使用多通道Tx的不同配置将链路跨度扩展到1.8 m且数据吞吐量提高到13.44 kbps的方法。对于1 m的链路跨度，在200和800 µs的快门速度下，分别测得的峰值信噪比约为14 dB和16 dB，成功接收比特率分别为99.4%和81%。

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