标题： 基于RIS的无线通信：高级建模、仿真与分析见解 显示英文标题

标题： RIS Assisted Wireless Communication: Advanced Modeling, Simulation, and Analytical Insights

摘要： 本文提出了一种新的视角来建模和仿真可重构智能表面（RIS）辅助的通信系统。 传统的天线设计方法通常依赖于阵列方法进行仿真，而通信系统建模则倾向于理想化天线行为。 这两种方法都无法充分捕捉RIS辅助通信的详细特性。 为了解决这一限制，我们提出了一种全面的仿真框架，联合建模RIS天线设计和通信过程。 该框架仿真了整个通信流程，包括信号生成、调制、传播、基于RIS的辐射、信号接收、对齐、解调、判决和处理。 使用QPSK调制信号进行验证，我们分析了系统性能，并研究了误码率（BER）、孔径填充时间、阵列大小和基带符号频率之间的关系。 结果表明，更大的阵列尺寸和更高的基带符号频率会加剧孔径填充时间的影响，导致BER增加。 此外，我们研究了BER随信噪比（SNR）的变化，并提出了一种基于最优匹配的对齐算法，与传统的基于导频的对齐方法相比，该算法显著降低了BER。 这项工作展示了RIS通信的整个过程，并揭示了比特错误的来源，为RIS辅助通信系统的設計和性能优化提供了有价值的见解。 显示英文摘要

摘要： This article presents a novel perspective to model and simulate reconfigurable intelligent surface (RIS)-assisted communication systems. Traditional methods in antenna design often rely on array method to simulate, whereas communication system modeling tends to idealize antenna behavior. Neither approach sufficiently captures the detailed characteristics of RIS-assisted communication. To address this limitation, we propose a comprehensive simulation framework that jointly models RIS antenna design and the communication process. This framework simulates the entire communication pipeline, encompassing signal generation, modulation, propagation, RIS-based radiation, signal reception, alignment, demodulation, decision, and processing. Using a QPSK-modulated signal for validation, we analyze system performance and investigate the relationship between bit error rate (BER), aperture fill time, array size, and baseband symbol frequency. The results indicate that larger array sizes and higher baseband symbol frequencies exacerbate aperture fill time effects, leading to increased BER. Furthermore, we examine BER variation with respect to signal-to-noise ratio (SNR) and propose an optimal matching-based alignment algorithm, which significantly reduces BER compared to conventional pilot-based alignment methods. This work demonstrates the entire process of RIS communication, and reveals the source of bit errors, which provides valuable insights into the design and performance optimization of RIS-assisted communication systems.