29 papers
Performance Analysis for ISAC Systems with 1-bit DACs
Murat Babek Salman, Ãzlem Tugfe Demir, Emil Björnson
Low-resolution quantization constrains the maximum achievable gains of multiple-input multiple-output (MIMO) systems. While the adverse effects and mitigation strategies have been…
Rethinking Energy Efficiency in Cell-Free Massive MIMO: The Role of Processing and Optical Fronthaul
Ozan Alp Topal, Ãzlem TuÄfe Demir, Cicek Cavdar
Cell-free massive MIMO promises uniformly high performance by combining densely distributed radio units, coherent transmission, and centralized processing. Unlike earlier radio gen…
RIS-Assisted Survivable Backhaul Recovery in Small-Cell Systems
Zhenyu Li, Ãzlem TuÄfe Demir, Emil Björnson +1
The increasing densification of small-cell networks substantially expands cable-based backhaul infrastructure, creating heightened vulnerability to cable link failures. This paper…
Distributed Two-Phase Processing for Modular XL-MIMO with Wireless Fronthaul under Hardware Impairments
Ãzlem TuÄfe Demir
Modular extremely large-scale MIMO (XL-MIMO) architectures combined with wireless fronthaul provide a scalable alternative to monolithic arrays, but their performance is sensitive…
Constant-Envelope Quantized Precoding with Power Control for Cell-Free Massive MIMO-OFDM
Ãzlem TuÄfe Demir, Salih GümüÅbuÄa
Cell-free massive MIMO has matured into a key candidate technology for 6G and beyond, owing to its ability to provide nearly uniform service quality to many user equipments (UEs) o…
Learning Energy-Efficient Modular Arrays under Hardware Non-linearities
Ãzlem TuÄfe Demir, Alva Kosasih
This paper investigates the joint optimization of power allocation and antenna activation in sparse extremely large aperture array systems operating under power amplifier non-linea…