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.
翻译:可重新配置的智能表面(RIS)是带有可部分编程通信环境的电子电路的平板结构,可被视为几乎是被动的,因为它只是反映向理想方向的波波,因此只需要能源来重新配置其反射元素(REs),本文件通过控制信号处理无线提供RIS电路的问题。 考虑同时的无线信息和电力传输(SWIPT)时考虑了两项基本原则:控制信号的信号质量足以检测信息,而且有足够的吸收能量进行重新配置。对一些最常见的SWIPT接收器(时间共享、分电、动态分电和天线选择)进行了研究,并提出了执行上述原则的相应优化问题,并以封闭形式加以解决。数字结果显示,在接收到电量波动的情况下,拟议的方法是有效的。