7 papers
Deep Learning-based Phase Reconfiguration for Intelligent Reflecting Surfaces
Özgecan Özdogan, Emil Björnson
Intelligent reflecting surfaces (IRSs), consisting of reconfigurable metamaterials, have recently attracted attention as a promising cost-effective technology that can bring new fe…
Reconfigurable Intelligent Surfaces: Three Myths and Two Critical Questions
Emil Björnson, Özgecan Özdogan, Erik G. Larsson
The search for physical-layer technologies that can play a key role in beyond-5G systems has started. One option is reconfigurable intelligent surfaces (RIS), which can collect wir…
Using Intelligent Reflecting Surfaces for Rank Improvement in MIMO Communications
Özgecan Özdogan, Emil Björnson, Erik G. Larsson
An intelligent reflecting surface (IRS), consisting of reconfigurable metamaterials, can be used to partially control the radio environment and thereby bring new features to wirele…
Intelligent Reflecting Surfaces: Physics, Propagation, and Pathloss Modeling
Özgecan Özdogan, Emil Björnson, Erik G. Larsson
Intelligent reflecting surfaces can improve the communication between a source and a destination. The surface contains metamaterial that is configured to "reflect" the incident wav…
Performance of Cell-Free Massive MIMO with Rician Fading and Phase Shifts
Özgecan Özdogan, Emil Björnson, Jiayi Zhang
In this paper, we study the uplink (UL) and downlink (DL) spectral efficiency (SE) of a cell-free massive multiple-input-multiple-output (MIMO) system with Rician fading channels.…
Uplink Spectral Efficiency of Massive MIMO with Spatially Correlated Rician Fading
Özgecan Özdogan, Emil Björnson, Erik G. Larsson
This paper considers the uplink (UL) of a multi-cell Massive MIMO (multiple-input multiple-output) system with spatially correlated Rician fading channels. The channel model is com…