A hybrid downlink system that simultaneously uses visible light communication (VLC) and radio frequency (RF) is investigated, assuming that only one of the two considered users is capable of receiving information over the optical band. In order to facilitate information transmissions from the VLC access point to the RF user, mixed VLC/RF relaying and simultaneous lightwave information and power transfer (SLIPT) are utilized. Moreover, a cognitive-based resource allocation policy and tractable bounds for the harvested energy are introduced. Furthermore, by taking into account the random location of the VLC and RF user terminals, the closed-form outage probability for the VLC user is given, while for the RF user, the outage probability is derived in terms of infinite-series, which is also approximated by a tractable closed-form expression. In addition, the outage probability of the RF user is minimized by optimizing the direct current (DC) component. Finally, simulations are provided to verify the accuracy of the theoretical analysis and demonstrate the effectiveness of the proposed optimization framework.

中文翻译：

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具有SLIPT的协作式混合VLC / RF系统

研究了同时使用可见光通信（VLC）和射频（RF）的混合下行链路系统，假设两个考虑的用户中只有一个能够在光带上接收信息。为了促进从VLC接入点到RF用户的信息传输，使用了混合VLC / RF中继以及同时进行的光波信息和功率传输（SLIPT）。此外，引入了基于认知的资源分配策略和所收获能量的易处理界限。此外，通过考虑VLC和RF用户终端的随机位置，可以得出VLC用户的封闭形式中断概率，而对于RF用户，可以通过无穷级推导中断概率，即也可以通过易处理的闭合形式表达式近似。此外，通过优化直流（DC）分量，可以最大程度地减小RF用户的断电概率。最后，提供仿真以验证理论分析的准确性并证明所提出的优化框架的有效性。