Future wireless networks require the ability to actively adjust the wireless environment to meet strict performance indicators. Reconfigurable Intelligent Surface (RIS) technology is gaining attention for its advantages of low power consumption, cost-effectiveness, and ease of deployment. However, existing channel models for RIS often ignore important properties, such as the impairment in the RIS's switch component and the polarization efficiency among antennas, limiting their practical use. In this paper, we propose a new channel model for RIS that considers these ignored properties, including the reflected field, scattered field, and antenna resonant mode. We verify the proposed model through the practical implementation of a 4 x 4 RIS array with patch antennas in the 3.5 GHz band, using a phase shifter as the switch component of a RIS element. The equivalent model of the phase shifter is also formulated and incorporated into the channel model. We propose a blind controlling algorithm to discuss the properties of our channel model and emphasize the importance of considering polarization and tracking mechanisms for the controlling algorithm. Our channel model is an improvement over existing models and can be used in the practical design of RIS technology. The proposed algorithm provides a practical approach to controlling the wireless environment, suitable for various wireless applications.
翻译:未来的无线网络需要能够主动调整无线环境以满足严格的性能指标。可重构智能表面(RIS)技术因其低功耗、费用效益和部署便利性而备受关注。然而,现有的RIS信道模型往往忽略了重要的性质,如RIS开关组件中的失效和天线之间的极化效率,限制了它们的实际使用。本文提出了一种新的考虑这些未考虑的性质的RIS信道模型,包括反射场、散射场和天线共振模式。我们通过实际实现在3.5 GHz频带中具有贴片天线的4x4 RIS阵列,并利用相移器作为RIS元件的开关元件来验证所提出的模型。相移器的等效模型也被制定并纳入信道模型中。我们提出了一个盲控制算法来讨论我们的信道模型的性质,强调了考虑极化和跟踪机制对控制算法的重要性。我们的信道模型是现有模型的改进,可用于RIS技术的实际设计。所提出的算法为控制无线环境提供了实用方法,适用于各种无线应用场景。