This letter investigates the impact of multiple shadows for indoor visible light communication (VLC) systems composed of a VLC access point and multiple terminals. The blockage is a crucial problem in the VLC system, which would result in great deterioration of users’ communication quality due to the shadow area caused by the blockage. Considering the room boundaries and overlap between shadows, we derive the mathematical expressions of the shadow area and position. In the simulation part, the effect of multiple shadows on throughput and outage performance is appraised. Furthermore, we also take the effect of the room size into account.

中文翻译：

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多个阴影对可见光通信通道的影响

这封信调查了多个阴影对由VLC接入点和多个终端组成的室内可见光通信（VLC）系统的影响。阻塞是VLC系统中的关键问题，由于阻塞造成的阴影区域会导致用户的通信质量大大下降。考虑到房间边界和阴影之间的重叠，我们得出阴影区域和位置的数学表达式。在仿真部分中，评估了多个阴影对吞吐量和中断性能的影响。此外，我们还考虑了房间大小的影响。