Reconfigurable intelligent surface (RIS)-empowered communications is on the rise and is a promising technology envisioned to aid in 6G and beyond wireless communication networks. RISs can manipulate impinging waves through their electromagnetic elements enabling some sort of control over the wireless channel. In this paper, the potential of RIS technology is explored to perform a sort of virtual equalization over-the-air for frequency-selective channels whereas, equalization is generally conducted at either the transmitter or receiver in conventional communication systems. Specifically, with the aid of an RIS, the frequency-selective channel from the transmitter to the RIS is transformed to a frequency-flat channel through elimination of inter-symbol interference (ISI) components at the receiver. ISI is eliminated by adjusting the phases of impinging signals particularly to maximize the incoming signal of the strongest tap. First, a general end-to-end system model is provided and a continuous to discrete-time signal model is presented. Subsequently, a probabilistic analysis for the elimination of ISI terms is conducted and reinforced with computer simulations. Furthermore, a theoretical error probability analysis is performed along with computer simulations. It is analyzed and demonstrated that conventional RIS phase alignment methods, can successfully eliminate ISI and the RIS-aided communication channel can be converted from frequency-selective to frequency-flat.
翻译:重新配置的智能表面(RIS)动力通信正在上升,这是在6G和无线通信网络之外帮助6G和无线通信网络的一个有希望的技术。RIS可以通过电磁元素操纵波波波,从而对无线频道进行某种控制。本文探讨RIS技术的潜力,以对频率选择性频道进行一种虚拟均衡的超天分配,而通常在常规通信系统的发射机或接收器进行均衡。具体地说,在IRS的帮助下,从发报机到IRS的频率选择频道通过消除接收器的同源干扰(ISI)部件转变为频率加速频道。通过调整信号的断线阶段,特别是最大限度地扩大最强的接通信号。首先,提供一般端对端系统模型,并持续进行离散时间信号模型。随后,通过计算机模拟,对消除ISI条款的概率进行概率分析,并辅之以计算机模拟。此外,通过计算机模拟频率的频率调整,对IRIIS进行理论误差概率分析,并演示常规的RIIS升级阶段。