We present a concept for networked optical wireless communications, also denoted as LiFi, to meet the requirements of industrial wireless applications. These are primarily mobility support with moderate data rates per device, reliable real-time communication, and integrated positioning. We describe a distributed multiuser multiple-input multiple-output architecture, serving mobile devices via an optical wireless infrastructure. The system consists of a central unit, being connected to a number of distributed optical frontends covering a larger area. Our main contribution is a medium access control protocol based on space division multiple access. Evaluation results demonstrate the advantages of joint transmission from adjacent optical frontends and the dynamic switching between spatial diversity and multiplexing. The relevance of spatial multiplexing becomes obvious through channel measurements in an indoor scenario. Moreover, we highlight a low-power physical layer based on on-off-keying for battery-powered mobile devices. Our architecture can easily integrate positioning by simultaneously measuring the time-of-flight between multiple optical frontends and the mobile device. We highlight the use of plastic optical fiber as an analog fronthaul technology and discuss the integration with other networks. The main functions described in this paper will be supported by the upcoming IEEE Std 802.15.13.

中文翻译：

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工业无线应用中用于 LiFi 的分布式多用户 MIMO

我们提出了一种网络光无线通信的概念，也称为LiFi，以满足工业无线应用的需求。这些主要是移动支持，每个设备具有中等数据速率、可靠的实时通信和集成定位。我们描述了一种分布式多用户多输入多输出体系结构，该体系结构通过光学无线基础结构为移动设备提供服务。该系统由一个中央单元组成，连接到多个覆盖更大区域的分布式光学前端。我们的主要贡献是基于空分多址的媒体访问控制协议。评估结果证明了相邻光前端的联合传输以及空间分集和复用之间的动态切换的优势。通过室内场景中的信道测量，空间复用的相关性变得显而易见。此外，我们重点介绍了基于电池供电移动设备的开关键控的低功耗物理层。我们的架构可以通过同时测量多个光学前端与移动设备之间的飞行时间来轻松集成定位。我们重点介绍了塑料光纤作为模拟前传技术的使用，并讨论了与其他网络的集成。即将发布的 IEEE Std 802.15.13 将支持本文中描述的主要功能。我们的架构可以通过同时测量多个光学前端和移动设备之间的飞行时间来轻松集成定位。我们重点介绍了塑料光纤作为模拟前传技术的使用，并讨论了与其他网络的集成。即将发布的 IEEE Std 802.15.13 将支持本文中描述的主要功能。我们的架构可以通过同时测量多个光学前端和移动设备之间的飞行时间来轻松集成定位。我们重点介绍了塑料光纤作为模拟前传技术的使用，并讨论了与其他网络的集成。即将发布的 IEEE Std 802.15.13 将支持本文中描述的主要功能。