This work addresses the comparison between active and passive RISs in wireless networks, with reference to the system energy efficiency (EE). To provably convergent and computationally-friendly EE maximization algorithms are developed, which optimize the reflection coefficients of the RIS, the transmit powers, and the linear receive filters. Numerical results show the performance of the proposed methods and discuss the operating points in which active or passive RISs should be preferred from an energy-efficient perspective.

翻译：这项工作涉及无线网络中主动和被动的RIS的比较,并参照系统能效(EE) 。 开发了可察觉的趋同和计算友好的 EEE 最大化算法,优化了RIS的反射系数、传输功率和线性接收过滤器。 数字结果显示了拟议方法的性能,并讨论了从节能角度选择主动或被动的RIS的操作点。</s>