Reconfigurable intelligent surface (RIS)-empowered communication is one of the promising 6G technologies that allows the conversion of the wireless channel into an intelligent transmit entity by manipulating the impinging waves using man-made surfaces. In this paper, the potential benefits of using RISs are investigated for indoor/outdoor setups and various frequency bands (from sub 6 GHz to millimeter-waves). First, a general system model with a single RIS is considered and the effect of the total number of reflecting elements on the probabilistic distribution of the received signal-to-noise ratio and error performance is investigated under Rician fading. Also for this case, the path loss exponent is analyzed by considering empirical path loss models. Furthermore, transmission models with multiple RISs are developed and analyzed for indoor and outdoor non line-of-sight (NLOS) scenarios. The conventional RIS selection strategies are also integrated for systems equipped with multiple RISs for the first time. Through extensive simulations, it is demonstrated that the RIS-assisted systems provide promising solutions for indoor/outdoor scenarios at various operating frequencies and exhibit significant results in error performance and achievable data rates even in the presence of system imperfections such as limited range phase adjustment and imperfect channel phase estimation at RISs.

中文翻译：

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未来无线网络中用于室内和室外应用的可重构智能表面的建模和分析

可重构智能表面 (RIS) 授权的通信是有前途的 6G 技术之一，它允许通过使用人造表面操纵撞击波将无线信道转换为智能传输实体。在本文中，研究了在室内/室外设置和各种频段（从 6 GHz 以下到毫米波）中使用 RIS 的潜在好处。首先，考虑具有单个 RIS 的通用系统模型，并研究了在 Rician 衰落下反射元件总数对接收信噪比和差错性能概率分布的影响。同样对于这种情况，通过考虑经验路径损耗模型来分析路径损耗指数。此外，针对室内和室外非视距 (NLOS) 场景开发和分析了具有多个 RIS 的传输模型。还首次为配备多个 RIS 的系统集成了传统的 RIS 选择策略。通过广泛的模拟，证明 RIS 辅助系统为各种工作频率的室内/室外场景提供了有前景的解决方案，即使在存在系统缺陷（例如有限范围相位调整和RIS 不完善的信道相位估计。