PhysFad：具有可调衰落的RI参数化环境的基于物理的端到端信道建模
PhysFad: Physics-Based End-to-End Channel Modeling of RIS-Parametrized Environments with Adjustable Fading
摘要：
可编程无线电环境参数化的可重构智能表面（RISs）正在成为一种新的无线通信模式，但目前使用的信道模型的设计和分析的信号处理算法不能包括衰落的方式，是忠实于底层波物理。为了克服这个障碍，我们引入了一个基于物理的端到端模型的RI参数化的无线信道可调衰落（杜撰的PhysFad），这是基于第一性原理耦合偶极子形式主义。PhysFad自然地结合了空间和因果关系的概念，分散（即，频率选择性）和每个RIS元件的相位和振幅响应的交织，以及任何产生的互耦合效应，包括长程介观相关性。PhysFad提供了最新的可调衰减缺少调谐旋钮。我们彻底的特点PhysFad，并证明其功能的一个原型问题的RIS启用的空中信道均衡在丰富的散射无线通信。我们还分享了一个用户友好的代码版本，以帮助社区过渡到基于物理的模型，并具有可调衰减。
英文摘要：
Programmable radio environments parametrized by reconfigurable intelligent surfaces (RISs) are emerging as a new wireless communications paradigm, but currently used channel models for the design and analysis of signal-processing algorithms cannot include fading in a manner that is faithful to the underlying wave physics. To overcome this roadblock, we introduce a physics-based end-to-end model of RIS-parametrized wireless channels with adjustable fading (coined PhysFad) which is based on a first-principles coupled-dipole formalism. PhysFad naturally incorporates the notions of space and causality, dispersion (i.e., frequency selectivity) and the intertwinement of each RIS element's phase and amplitude response, as well as any arising mutual coupling effects including long-range mesoscopic correlations. PhysFad offers the to-date missing tuning knob for adjustable fading. We thoroughly characterize PhysFad and demonstrate its capabilities for a prototypical problem of RIS-enabled over-the-air channel equalization in rich-scattering wireless communications. We also share a user-friendly version of our code to help the community transition towards physics-based models with adjustable fading.
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