Αναδιαρθρώσιμες ευφυείς επιφάνειες για ασύρματες επικοινωνίες πέραν της 5ης γενιάς

Abstract

The purpose of this paper is a lot of research using reconfigurable smart surfaces (RIS) in long-range wireless networks to develop smart wireless environments. In a RIS, surfaces can control the propagation of incident electromagnetic waves in a programmable smart wireless environment. In parallel, a way is provided to intentionally transform the implementation of a channel, changing it into a controllable set of devices that can be optimized to maximize the overall system performance. Therefore and based on scientific research the RIS is an artificial surface made of electromagnetic (EM) materials that are electronically controlled by implanted electronics. A new cost-effective solution that improves the energy efficiency and spectral efficiency of wireless communications is then presented. The organization of this document is as follows. Section 2 analyzes existing and recent communication technologies based on Intelligent Surfaces with recent state-of-the-art systems. Section 3 describes the working principle of RIS, the intelligent wireless link environment supported by RIS, its related limitations, and the comparison of RIS performance parameters. The principle and operation of metamaterials are discussed in Section 4. Performance comparison of liquid crystal-based RIS implementation active/phase shifts and new RIS active signal models are discussed in Section 5.RIS-based FPGA and its embedded architectures are discussed in Section 6. Section 7 presents the applications and future research directions. At the end of this paper, its completion is presented and ends in Section 8.