Active Reconfigurable Intelligent Surfaces: Expanding the Frontiers of Wireless Communication-A Survey

作者：Manzoor Ahmed, Salman Raza, Aized Amin Soofi, Feroz Khan, Wali Ullah Khan, Syed Zain Ul Abideen, Fang Xu, Zhu Han · 发表于：IEEE Communications Surveys & Tutorials · 年份：2024 · DOI：10.1109/comst.2024.3423460 · 被引用次数：108 · 研究领域：Modular Robots and Swarm Intelligence、Spacecraft Design and Technology

The swift progress of metasurface technology, enabling meticulous manipulation of the propagation environment, is anticipated to bring a transformative impact on sixth-generation (6G) wireless communications efficiency. Utilizing metasurface elements presents a promising opportunity for achieving passive scattering at sub-wavelength scales, facilitating intelligent radio settings’ advancement. Active Reconfigurable Intelligent Surfaces (ARIS) have gained significant interest in emergent metasurface technology. In contrast to passive RIS, which exhibits a certain degree of performance enhancement but encounters restrictions arising from the “double fading” phenomenon in the phase response, ARIS emerges as a highly promising alternative to counter such restrictions. This study provides a complete examination of ARIS, particularly emphasizing current improvements and its various uses within the context of 6G wireless networks. The review commences by laying a robust foundation in RIS technology, covering the various types and modes of RIS. Following this, we will explore the benefits and practical implementations of ARIS. Through a systematic examination, we categorize different approaches within ARIS-enabled use cases. These scenarios include optimizing the sum rate and signal-to-noise ratio, attaining maximum secrecy rate, energy minimization, and ensuring channel estimation. Additionally, we provide a summary and lessons learned along with a summary table for each category to...