Beamforming Optimization for Intelligent Reflecting Surfaces without CSI

• Published in: IEEE wireless communications letters Vol. 9; no. 9; pp. 1476 - 1480
• Main Authors: Pegorara Souto, Victoria Dala, Souza, Richard Demo, Uchoa-Filho, Bartolomeu F., Li, Ang, Li, Yonghui
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.09.2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Array signal processing; Beamforming; Intelligent reflecting surface; MIMO communication; Optimization; Particle swarm optimization; Radio frequency; Reconfigurable intelligent surfaces; Signal to noise ratio; Training

This letter considers the communication between a multiple antenna Base Station (BS) and a single antenna user, assisted by an Intelligent Reflecting Surface (IRS). Due to the large number of elements at the IRS, acquiring Channel State Information (CSI) requires many radio-frequency chains and cons...