面向工业互联的可见光通信技术研究

With the explosive demand of data communication in modern manufacturing industry, conventional radio-frequency (RF) based communication techniques cannot meet requirements of industrial data communication due to the exhausted spectrum resource and extremely complicated electromagnetic interference in the factory. Therefore, visible light communication (VLC) for industrial applications is gaining increasing attentions in research from both academic and industry communities. However, existing VLC systems heavily rely on specialized blue LEDs, optical lens and expensive avalanche photodiodes, resulting in high system complexity and cost which cannot be afforded by realistic industrial applications. To improve the availability of VLC for industrial applications, we propose to design a practical VLC system by reusing LED lighting infrastructure and cameras in the plant so that innovates totally new communication links for data interconnection. In particular, we plan to deeply investigate high order modulation schemes based on commercial white lighting LED without the brother of LED nonlinear behaviors, novel collaboration mechanism enabled by multiple LED luminaires in the plant to benefit communication capacity, and self-adaptive demodulation/decoding schemes to accommodate heterogeneous reception devices in industrial applications. As a result, we believe the research outcomes offered by this project will substantially improve the performance in terms of throughput and practicality of the VLC system enabled by commercial off-the-shelf devices as well as provide new insights for researchers in Industrial Internet of Things and Industrial Internet fields.

随着现代制造业对数据互联互通需求的增加，传统无线电通信技术受限于有限的频谱资源和工厂中的复杂电磁环境，导致其不能很好地满足工业互联的需要，因此以可见光通信为代表的新兴通信技术在工业互联中的应用受到了越来越多的关注。但现有的可见光通信系统，由于使用专用的蓝光LED、光学透镜和高成本光敏接收器等，导致其系统复杂且成本高昂，所以并未见可见光通信在工业互联中实际使用。为了提高可见光通信技术在工业互联中的可用性，本申请创新性地提出利用工厂中普通商用照明LED灯和摄像头的实用可见光通信技术，构建可用于工业互联的通信网络。本项目主要研究消除LED非线性影响的高阶调制方法、多灯协同传输机制和自适应高效解调解码算法。本项目研究成果将有效地提升基于普通商用设备的实用可见光通信系统性能，同时也为工业物联网、工业互联网领域的研究者提供一个新的研究思路。

作为6G重要技术之一，可见光通信在工业互联中有着重要的应用价值。但现有的可见光通信系统，由于使用专用蓝光LED、光学透镜和高成本光敏接收器等，导致其系统复杂且成本高昂，极大地限制了其在工业互联中的应用。为了提高可见光通信技术在工业互联中的可用性，本申请创新性地提出利用工厂中普通照明LED灯和摄像头的实用可见光通信技术，构建可用于工业互联的通信网络。为此，本项目针对普通照明LED非线性严重影响可见光通信性能的问题，提出了基于空间光合成的高阶调制技术及其实现方法，在有效降低基于普通照明LED的光通信发射机复杂度的情况下提高了通信容量；针对基于普通摄像头的相机光通信容量低、可靠性差等问题，提出了基于多像素累积采样的信号增强技术、基于像素搜索的高效光通信信道均衡技术等一系列相机光通信优化方法，有效提高了相机光通信在复杂多样工业互联场景下的通信速率和可靠性；针对相机光通信与目标识别不兼容问题，提出了基于特征分离和基于像素分离的通信感知一体化技术，有效提高了普通摄像头的利用率，并探索了相机光通信感知一体化这一全新研究方向。基于以上成果，项目组在ACM MobiCom、IEEE TMC、OSA OL等国内外重要会议和期刊上发表论文14篇，申请国家发明专利5项，获得了国际半导体照明联盟2022年度“全球半导体照明创新100佳”称号。