标题： 基于可重构智能表面辅助的无线链路广义阻抗模型 显示英文标题

标题： Generalised Impedance Model of Wireless Links Assisted by Reconfigurable Intelligent Surfaces

摘要： 我们设计了一个端到端的通信信道模型，该模型描述了RIS辅助的MIMO无线链路的性能。 该模型借鉴了矩量法中的阻抗（相互作用）矩阵形式，并提供了一个基于物理的通信模型。 在发射和接收天线阵列远离RIS超过波长的配置中，一个简化模型能够为任意RIS单元结构几何提供准确的结果。 重要的是，简化模型配置为级联信道转移矩阵，其数学结构符合广泛接受但准确性较低的系统级RIS模型。 针对具有规范几何散射体的二进制RIS结构的设计，给出了通信模型的数值验证。 获得的结果与路径损耗模型一致：对于发射器和接收器之间的遮挡视距，(优化) RIS辅助链路的信道容量按 $R^{-2}$变化，其中在固定发射器位置时，$R$为RIS接收器距离。 我们的结果表明，基于互阻抗矩阵的通信模型的应用并不局限于规范的最小散射RIS单元结构。 显示英文摘要

摘要： We devise an end-to-end communication channel model that describes the performance of RIS-assisted MIMO wireless links. The model borrows the impedance (interaction) matrix formalism from the Method of Moments and provides a physics-based communication model. In configurations where the transmit and receive antenna arrays are distant from the RIS beyond a wavelength, a reduced model provides accurate results for arbitrary RIS unit cell geometry. Importantly, the simplified model configures as a cascaded channel transfer matrix whose mathematical structure is compliant with widely accepted, but less accurate, system level RIS models. A numerical validation of the communication model is presented for the design of binary RIS structures with scatterers of canonical geometry. Attained results are consistent with path-loss models: For obstructed line-of-sight between transmitter and receiver, the channel capacity of the (optimised) RIS-assisted link scales as $R^{-2}$, with $R$ RIS-receiver distance at fixed transmitter position. Our results shows that the applicability of communication models based on mutual impedance matrices is not restricted to canonical minimum scattering RIS unit cells.