Visible light communication (VLC) is a promising technology that addresses the bandwidth bottleneck of radio-frequency based indoor wireless networks. Optical attocell networks using VLC backhaul links have been proposed. Line-of-sight (LOS) and mirror-aided non-LOS links can be used for backhaul transmission. As the visible light spectrum is used for both access downlink and bidirectional backhaul transmission, co-channel interference is a major issue. In this paper, we analyze the performance of optical attocell networks using VLC backhaul links taking into account illumination and eye safety requirements. Based on the signal-to-interference-plus-noise ratio of different backhaul links, the bandwidth allocation ratio when using an in-band frequency reused scheme is discussed. Finally, aggregate data rates of networks using different VLC backhaul configurations are compared. Results show that LOS backhaul configuration can achieve nearly optimal network performance while mirror-aided non-LOS backhaul configuration is more robust against misalignment.

可见光通信（VLC）是一项有前途的技术，可以解决基于射频的室内无线网络的带宽瓶颈。已经提出了使用VLC回程链路的光学attocell网络。视线（LOS）和镜像辅助的非LOS链路可用于回程传输。由于可见光谱既用于接入下行链路传输又用于双向回程传输，所以同信道干扰是一个主要问题。在本文中，我们在考虑照明和眼睛安全要求的情况下，使用VLC回程链路分析了光学attocell网络的性能。基于不同回程链路的信噪比和噪声比，讨论了使用带内频率复用方案时的带宽分配比。最后，比较使用不同VLC回程配置的网络的总数据速率。结果表明，LOS回程配置可以实现近乎最佳的网络性能，而镜像辅助的非LOS回程配置在抵御未对准方面更具鲁棒性。