Wireless Communication Aided by Intelligent Reflecting Surface: Active or Passive?

Article Engineering, Electrical & Electronic

Intelligent Reflecting Surface-Aided Wireless Communications: A Tutorial

Qingqing Wu et al.

Summary: Intelligent reflecting surface (IRS) is a technology that can alter wireless signal propagation in wireless networks by dynamically changing wireless channels to enhance communication performance. The future hybrid wireless network aided by IRS, comprising both active and passive components, is expected to achieve sustainable capacity growth cost-effectively.

IEEE TRANSACTIONS ON COMMUNICATIONS (2021)

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Article Engineering, Electrical & Electronic

Active Reconfigurable Intelligent Surface-Aided Wireless Communications

Ruizhe Long et al.

Summary: The paper introduces a new type of RIS, called active RIS, which enhances the incoming signal by incorporating active loads to each reflecting element, in contrast to conventional passive RIS systems. However, this amplification may unintentionally boost RIS-correlated noise, requiring optimization of the reflecting coefficient matrix at the RIS and receive beamforming at the receiver to strike a balance between maximizing received signal power and minimizing RIS-related noise.

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS (2021)

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Article Engineering, Electrical & Electronic