标题： 流体可重构智能表面辅助的无线通信系统性能分析 显示英文标题

标题： Performance Analysis of Wireless Communication Systems Assisted by Fluid Reconfigurable Intelligent Surfaces

摘要： 本文研究了由流体可重构智能表面（FRIS）辅助的新兴无线通信系统的性能。与传统的可重构智能表面（RIS）不同，FRIS由受流体启发的超材料组成，这些材料以密集排列的小单元矩阵形式分布在表面上。它根据实时信道条件动态激活特定元素以实现信号反射和调制。 考虑一个下行场景，其中基站通过FRIS与用户终端通信，我们首先通过推导累积分布函数和概率密度函数的闭合近似表达式来表征等效端到端信道的统计行为。 利用这些表达式，推导出了中断概率的解析近似值以及遍历容量的紧上界，包括它们在高信噪比下的渐近特性。 我们的研究结果揭示了关键的性能趋势，表明与传统RIS相比，FRIS能够显著提高链路可靠性和频谱效率，这归因于其从密集预配置网格中动态选择最佳元素的能力。 显示英文摘要

摘要： This letter investigates the performance of emerging wireless communication systems assisted by a fluid reconfigurable intelligent surface (FRIS). Unlike conventional reconfigurable intelligent surfaces (RISs), an FRIS consists of fluid-inspired metamaterials arranged in a densely packed matrix of sub-elements over a surface. It dynamically activates specific elements for signal reflection and modulation based on real-time channel conditions. Considering a downlink scenario where a base station communicates with a user terminal via a FRIS, we first characterize the statistical behavior of the equivalent end-to-end channel by deriving closed-form approximations for its cumulative distribution and probability density functions. Using these expressions, an analytical approximation for the outage probability and a tight upper bound on the ergodic capacity, including their asymptotic behaviors for high signal-to-noise ratio values, are derived. Our findings reveal key performance trends demonstrating that FRIS can substantially improve link reliability and spectral efficiency compared to conventional RISs, owing to its capability to dynamically select optimal elements from a dense preconfigured grid.