This paper investigates a dual-hop joint visible light communication (VLC) and backscatter communication (BC) relaying framework under the finite blocklength (FBL) constraint, aiming at energy-neutral Ambient Internet of Things (A-IoT) deployments. In the proposed system, indoor LED access points are used to simultaneously provide illumination and transmit information over light to a backscatter device (BD), which harvests optical energy and backscatters the received messages to user equipments (UEs) equipped with radio frequency (RF) front ends. This forwarding of the information from VLC to RF channels is implemented without the need for carrier synthesizers and power amplifiers at the IoT node. By modeling the end-to-end communication link with short-packet IoT traffic and realistic levels of interference between adjacent VLC coverage areas, we analyze the outage performance and achievable data rate of the proposed system. Simulation results demonstrate that key factors, such as placement and orientation of the BD, as well as the selected code rate of the system affect reliability and data rate that can be achieved for communication purposes. The insights gained from this study pave the way for ambient power-enabled IoT solutions and future hybrid VLC/RF network designs.

翻译：本文研究有限块长约束下的双跳可见光通信与反向散射通信联合中继框架，旨在实现能量自持的环境物联网部署。在所提出的系统中，室内LED接入点同时提供照明并通过光波向反向散射设备传输信息；该设备收集光能并将接收到的消息反向散射至配备射频前端的用户设备。这种从可见光信道到射频信道的信息转发无需物联网节点配备载波合成器与功率放大器。通过采用短包物联网流量模型并考虑相邻可见光覆盖区域间的实际干扰水平，我们对端到端通信链路进行建模，分析了所提系统的中断性能与可达数据速率。仿真结果表明，反向散射设备的布设位置与朝向、系统选择的编码速率等关键因素会影响通信的可靠性与可达数据速率。本研究获得的见解为环境供能物联网解决方案及未来混合可见光/射频网络设计奠定了基础。