Optimizing a Binary Intelligent Reflecting Surface for OFDM Communications under Mutual Coupling
Conference: WSA 2021 - 25th International ITG Workshop on Smart Antennas
11/10/2021 - 11/12/2021 at French Riviera, France
Proceedings: ITG-Fb. 300: WSA 2021
Pages: 6Language: englishTyp: PDF
Authors:
Bjoernson, Emil (Department of Electrical Engineering, Linköping University, Linköping, Sweden & Department of Computer Science, KTH Royal Institute of Technology, Kista, Sweden)
Abstract:
An intelligent reflecting surface (IRS) can greatly improve the channel quality over a frequency-flat channel, if it is configured to reflect the incident signal as a beam towards the receiver. However, the fundamental limitations of the IRS technology become apparent over practical frequency-selective channels, where the same configuration must be used over the entire bandwidth. In this paper, we consider a wideband orthogonal frequency-division multiplexing (OFDM) system that is supported by a fairly realistic IRS setup with two unbalanced states per element and also mutual coupling. We describe the simulation setup considered in the IEEE Signal Processing Cup 2021, propose a low-complexity solution for channel estimation and IRS configuration, and evaluate it on that setup.