Özlem

Abstract: 

In this talk, we will discuss the integration of sensing and communication (ISAC) in centralized cell-free massive MIMO networks for target detection. We examine the role of ISAC transmit access points in serving user equipments and steering beams towards a target within a multi-static sensing framework. A detection approach based on a maximum a posteriori ratio test is presented to identify targets amidst clutter, termed as "target-free signals". In addition, sensing spectral efficiency (SE) is introduced as a metric to assess resource utilization in ISAC systems and a power allocation algorithm is described to optimize the sensing signal-to-interference-plus-noise ratio while meeting communication requirements. The performance of two ISAC configurations, one using existing communication beams for sensing and the other employing additional sensing beams, is evaluated under different scenarios. The talk will highlight the benefits of integrating sensing and communication in cell-free massive MIMO networks, offering insights into more efficient wireless communication systems.

Biography:

Özlem Tuğfe Demir received the B.S., M.S., and Ph.D. degrees in Electrical and Electronics Engineering from Middle East Technical University, Ankara, Turkey, in 2012, 2014, and 2018, respectively. She was a Postdoctoral Researcher at Linköping University, Sweden in 2019-2020 and at KTH Royal Institute of Technology, Sweden in 2021-2022. She is currently an Assistant Professor with the Department of Electrical and Electronics Engineering, TOBB University of Economics and Technology, Ankara, Turkey. She has authored the textbooks Foundations of User-Centric Cell-Free Massive MIMO (2021) and Introduction to Multiple Antenna Communications and Reconfigurable Surfaces (2024). Her research interests focus on signal processing and optimization in wireless communications, massive MIMO, cell-free massive MIMO, beyond 5G multiple antenna technologies, reconfigurable intelligent surfaces, and green mobile networks.