Reconfigurable intelligent surfaces (RISs) are planar structures with attached electronic circuitry that enable a partially programmable communication environment. RIS operation can be regarded as nearly passive since it acts by simply reflecting the impinging traveling waves towards desired directions, thus requiring energy only for the reconfiguration of its reflective elements (REs). This paper tackles the problem of wirelessly powering RIS circuitry via control signaling. Simultaneous wireless information and power transfer (SWIPT) is considered by taking into account two basic principles: that signal quality of the control signals is sufficient for information detection, and that there is enough harvested energy for the reconfiguration. Some of the most common SWIPT receivers (time sharing, power splitting, dynamic power splitting, and antenna selection) are studied and the corresponding proposed optimization problems implementing the aforementioned principles are formulated and solved in closed form. Numerical results show the effectiveness of the proposed methods in the presence of received power fluctuations.

中文翻译：

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可重构智能表面的同步控制信息和电力传输

可重构智能表面 (RIS) 是带有附加电子电路的平面结构，可实现部分可编程的通信环境。RIS 操作可以被视为几乎是被动的，因为它通过简单地将撞击行波反射到所需方向来起作用，因此仅需要能量来重新配置其反射元件 (RE)。本文解决了通过控制信号为 RIS 电路无线供电的问题。同时无线信息和功率传输 (SWIPT) 是通过考虑两个基本原则来考虑的：控制信号的信号质量足以进行信息检测，并且有足够的收集能量用于重新配置。一些最常见的 SWIPT 接收器（分时、功率分配、动态功率分配、和天线选择）进行研究，并以封闭形式制定和解决实施上述原则的相应建议优化问题。数值结果表明了所提出的方法在接收功率波动的情况下的有效性。