33 citations · 64 across the 15 of their papers we have counts for
15 papers
CII: Novel CSI-RS Metric for Joint Precoder and RIS Reporting in Multi-User NextG Networks
Ali Fuat Sahin, Sefa Kayraklik, Ali Gorcin +3
While reconfigurable intelligent surfaces (RISs) are among the key enablers for next-generation (NextG) wireless networks, efficient feedback reporting for joint base station (BS)…
A Novel Stripe-based RIS Optimization for UAV Communications and Sensing in Low-Altitude Wireless Networks
Burak Ahmet Celebi, Sefa Kayraklik, Onur Salan +3
Low-altitude wireless networks (LAWN) envision a reconfigurable 3D network capable of supporting mission-critical aerial operations. This paper presents a reconfigurable intelligen…
RIS-Assisted Secure Transmission with Artificial Noise: Element Allocation and Measurements
Mustafa Furkan Beker, Ahmet Muaz Aktas, Sefa Kayraklik +1
Physical layer security in reconfigurable intelligent surface (RIS)-assisted wireless systems can be improved through coordinated control of signal transmission and RIS configurati…
Experimental Performance of a 5G N78 Reconfigurable Intelligent Surface: From Controlled Measurements to Commercial Network Deployment
Sefa Kayraklık, Samed Keşir, Batuhan Kaplan +3
This paper presents a real-world experimental analysis of a modular reconfigurable intelligent surface (RIS) prototype designed to operate in the 5G N78 band. Unlike most RIS studi…
A Novel CSI-RS Reporting Scheme for RIS Optimization in O-RAN-based NextG Networks
Ali Fuat Sahin, Sefa Kayraklik, Ali Gorcin +3
Reconfigurable intelligent surface (RIS) technology is a promising enabler for next-generation (NextG) wireless systems, capable of dynamically shaping the propagation environment.…
Ray Tracing-Enabled Digital Twin for RIS Phase Optimization: Implementation and Experimental Validation
Ömer Lütfü Karakelle, Sefa Kayraklık, İbrahim Hökelek +2
Determining the optimal phase configurations of reconfigurable intelligent surface (RIS) elements typically requires complex channel estimation procedures with high pilot overhead,…
RIS-Assisted Physical Layer Security: Artificial Noise-Driven Optimization and Measurements
Ahmet Muaz Aktas, Sefa Kayraklik, Sultangali Arzykulov +3
Reconfigurable intelligent surface (RIS) has emerged as a key enabler for providing signal coverage, energy efficiency, reliable communication, and physical layer security (PLS) in…
ORIX: Orchestration of RIS with xApps for Smart Wireless Factory Environments
Sefa Kayraklik, Ali Fuat Sahin, Onur Salan +8
The vision of a smart wireless factory (SWF) demands highly flexible, low-latency, and reliable connectivity that goes beyond conventional wireless solutions. Reconfigurable intell…
N78 Frequency Band Modular RIS Design and Implementation
Sefa Kayraklık, Recep Baş, Hasan Oğuzhan Çalışkan +6
Reconfigurable intelligent surface (RIS), capable of dynamically controlling wireless propagation characteristics using reflecting antenna elements, is a promising technology for e…
Dual Target-Mounted RISs-Assisted ISAC Against Eavesdropping and Malicious Interference
Zehra Yigit, Sefa Kayraklik, Ertugrul Basar +1
The synergy between integrated sensing and communication (ISAC) and reconfigurable intelligent surfaces (RISs) unlocks novel applications and advanced services for next-generation…
RIS Optimization Algorithms for Urban Wireless Scenarios in Sionna RT
Ahmet Esad Güneşer, Berkay Şekeroğlu, Sefa Kayraklık +4
This paper evaluates the performance of reconfigurable intelligent surface (RIS) optimization algorithms, which utilize channel estimation methods, in ray tracing (RT) simulations…
Fast Network Recovery from Large-Scale Disasters: A Resilient and Self-Organizing RAN Framework
M. Yaser Yagan, Sefa Kayraklik, Samed Kesir +8
Extreme natural phenomena are occurring more frequently everyday in the world, challenging, among others, the infrastructure of communication networks. For instance, the devastatin…
Practical Implementation of RIS-Aided Spectrum Sensing: A Deep Learning-Based Solution
Sefa Kayraklik, Ibrahim Yildirim, Ertugrul Basar +2
This paper presents reconfigurable intelligent surface (RIS)-aided deep learning (DL)-based spectrum sensing for next-generation cognitive radios. To that end, the secondary user (…
Measurement-based Characterization of Physical Layer Security for RIS-assisted Wireless Systems
Samed Keşir, Sefa Kayraklık, İbrahim Hökelek +3
There have been recently many studies demonstrating that the performance of wireless communication systems can be significantly improved by a reconfigurable intelligent surface (RI…
Indoor Coverage Enhancement for RIS-Assisted Communication Systems: Practical Measurements and Efficient Grouping
Sefa Kayraklık, Ibrahim Yildirim, Yarkın Gevez +2
Reconfigurable intelligent surface (RIS)-empowered communications represent exciting prospects as one of the promising technologies capable of meeting the requirements of the sixth…