Ensuring the precision of channel modeling plays a pivotal role in the development of wireless communication systems, and this requirement remains a persistent challenge within the realm of networks supported by Reconfigurable Intelligent Surfaces (RIS). Achieving a comprehensive and reliable understanding of channel behavior in RIS-aided networks is an ongoing and complex issue that demands further exploration. In this paper, we empirically validate a recently-proposed impedance-based RIS channel model that accounts for the mutual coupling at the antenna array and precisely models the presence of scattering objects within the environment as a discrete array of loaded dipoles. To this end, we exploit real-life channel measurements collected in an office environment to demonstrate the validity of such a model and its applicability in a practical scenario. Finally, we provide numerical results demonstrating that designing the RIS configuration based upon such model leads to superior performance as compared to reference schemes.

翻译：确保信道建模的精度在无线通信系统发展中起着关键作用，这一要求在可重构智能表面（RIS）支撑的网络领域始终是一个持续存在的挑战。对RIS辅助网络中信道行为实现全面可靠的理解是一个亟待深入探索的复杂难题。本文对近期提出的基于阻抗的RIS信道模型进行了实验验证，该模型考虑了天线阵列的互耦效应，并将环境中的散射物体精确建模为离散的加载偶极子阵列。为此，我们利用办公室环境中采集的真实信道测量数据，验证了该模型的有效性及其在实际场景中的适用性。最后，数值结果表明，基于该模型设计RIS配置相比参考方案具有更优越的性能。