Optimizing a Binary Intelligent Reflecting Surface for OFDM Communications under Mutual Coupling
arXiv:2106.04280
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.
To appear at the 25th International ITG Workshop on Smart Antennas (WSA 2021), 6 pages, 6 figures. The code and dataset is available at https://github.com/emilbjornson/SP_Cup_2021