HISAR

Publications

Sub-THz and mmWave

RF Chain-Free mmWave Transmission: Modeling and Experimental Verification

Author: Yagan, M. Y.
Other Authors: Hökelek, I., Pusane, A. E., & Görçin, A.
Published at: IEEE PIMRC2024
Publication Type: Conference Paper

Experimental Assessment of Misalignment Effects in Terahertz Communications

Author: Nayir, H.
Other Authors: Karakoca, E., Kurt, G. K., & Gorcin, A.
Published at: IEEE ICC2024
Publication Type: Conference Paper

Measurement-Based Modeling of Short Range Terahertz Channels and Their Capacity Analysis

Author: Karakoca, E.
Other Authors: Nayir, H., Karabulut Kurt, G., & Görçin, A.
Published at: IEEE Globecom 2023
Publication Type: Conference Paper

Performance Analysis of Dual-Hop THz Communication Under Foggy Weather

Author: Bilgiç, B.
Other Authors: Tedik Başaran, S., Hökelek, I., & Görçin, A.
Published at: IEEE BlackSea 2023
Publication Type: Conference Paper

Hierarchical Dirichlet Process Based Gamma Mixture Modeling for Terahertz Band Wireless Communication Channels

Author: Karakoca, E.
Other Authors: Karabulut Kurt, G., & Gorcin, A.
Published at: IEEE Access
Publication Type: Journal Article

A Novel LFM Waveform for Terahertz-Band Joint Radar and Communications over Inter-Satellite Links

Author: Sümen, G.
Other Authors: Karabulut Kurt, G., & Gorcin, A.
Published at: IEEE Globecom
Publication Type: Conference Paper

Modeling and Analysis of Short Distance Sub-Terahertz Communication Channel via Mixture of Gamma Distribution

Author: Tekbıyık, K.
Other Authors: Ekti, A. R., Kurt, G. K., Gorcin, A., & Yarkan, S.
Published at: IEEE Transactions on Vehicular Technology
Publication Type: Journal Article

A Holistic Investigation of Terahertz Propagation and Channel Modeling toward Vertical Heterogeneous Networks

Author: Tekbiyik, K.
Other Authors: Ekti, A. R., Kurt, G. K., Gorcin, A., & Yanikomeroglu, H.
Published at: IEEE Communications Magazine
Publication Type: Journal Article

Terahertz Band Communication Systems: Challenges, Novelties and Standardization Efforts

Author: Tekbiyik, K.
Other Authors: Ekti, A. R., Kurt, G. K., & Gorcin, A.
Published at: Physical Communication
Publication Type: Journal Article

Beam Codebook Refinement for mmWave Devices with Random Orientations: Concept and Experimental Validation

Author: Bora Bozkurt
Other Authors: Ahmet Muaz AKTAŞ, Hasan Atalay GÜNEL, Mohaned Chraiti.
Published at: IEEE WCNC 2025
Publication Type: Conference Paper

Coverage Analysis of Relay Assisted THz Networks

Author: Bengü Bilgiç.
Other Authors: Semiha Tedik Başaran, Ibrahim Hökelek, Ali Görçin.
Published at: IEEE Meditcom 2024
Publication Type: Conference Paper

RF-Chain-Free mmWave Transmission: Modeling and Experimental Verification

Author: M. Yaser Yağan.
Other Authors: İ. Hökelek, A. E. Pusane, A. Görçin.
Published at: IEEE PIMRC 2024
Publication Type: Conference Paper

Massive MIMO

Application of Kalman Filtering Approach on Signal Angle-of-Arrival Estimates

Author: Yildiz, U.
Other Authors: Coskun, A. F.
Published at: IEEE SIU 2023
Publication Type: Conference Paper

Performance Analysis of Massive MIMO Network with Space-Time Line Coded OFDM Under Practical Impairments

Author: Yilmaz, T.
Other Authors: Coskun, A. F., Ilhan, H.
Published at: IEEE BlackSea 2023
Publication Type: Conference Paper

User Pairing and Beamforming Design in mmWave CR-NOMA Networks

Author: Akyol, Ö. F.
Other Authors: Tedik Başaran, S., Hökelek, I., & Görçin, A.
Published at: IEEE BalkanCom 2023
Publication Type: Conference Paper

RIDNet Assisted cGAN Based Channel Estimation for One Bit ADC mmWave MIMO Systems

Author: Karakoca, E.
Other Authors: Nayir, H., Gorcin, A., & Qaraqe, K.
Published at: IEEE VTC2023-Spring
Publication Type: Conference Paper

Angle of Arrival Estimation for THz Enabled Space Information Networks

Author: Nayir, H.
Other Authors: Karabulut Kurt, G., & Gorcin, A.
Published at: Montreal, Canada
Publication Type: Conference Paper

Enhanced Channel Estimation for One-Bit mmWave MIMO via cGAN and Feature Attention Network

Author: Karakoca, E.
Other Authors: Nayir, H., Gorcin, A., & Qaraqe, K.
Published at: IEEE VTC2023-Spring
Publication Type: Conference Paper

Channel Estimation Using RIDNet Assisted OMP for Hybrid-Field THz Massive MIMO Systems

Author: Nayir, H.
Other Authors: Karakoca, E., Gorcin, A., & Qaraqe, K.
Published at: ICC 2023 - IEEE International Conference on Communications, Rome, Italy
Publication Type: Conference Paper

Author: Yagan, M. Y.
Other Authors: Coskun, A. F., & Pusane, A. E.
Published at: 2023 17th European Conference on Antennas and Propagation (EuCAP)
Publication Type: Conference Paper

Author: Karakoca, E.
Other Authors: Nayir, H., Gorcin, A., & Qaraqe, K.
Published at: IEEE Globecom Workshop, 2022
Publication Type: Conference Paper

Hybrid Field Channel Estimation for Massive MIMO Systems based on OMP Cascaded Convolutional Autoencoder

Author: Nayir, H.
Other Authors: Karakoca, E., Gorcin, A., & Qaraqe, K.
Published at: IEEE VTC2022-Fall
Publication Type: Conference Paper

Reconfigurable Smart Surfaces

Multi-user directional modulation with reconfigurable holographic surfaces

Author: Yagan, M. Y.
Other Authors: Kesir, S., Hökelek, I., Pusane, A. E., & Görçin, A.
Published at: EURASIP Journal on Wireless Communications and Networking, 2024(1), 1-18
Publication Type: Journal Article

Zero-Forcing Beamforming for Beam Sweeping with Reconfigurable Holographic Surfaces

Author: Yagan, M. Y.
Other Authors: Hökelek, I., Pusane, A. E., & Görçin, A.
Published at: 2024 IEEE Wireless Communications and Networking Conference (WCNC)
Publication Type: Conference Paper

Space-time block coded reconfigurable intelligent surface-based received spatial modulation

Author: Bayar, F.
Other Authors: Salan, O., Ilhan, H., & Aydin, E.
Published at: IEEE Transactions on Mobile Computing, 2024
Publication Type: Journal Article

Deep Learning Based Detection on RIS Assisted RSM and RSSK Techniques

Author: Salan, O.
Other Authors: Bayar, F., Ilhan, H., & Aydin, E.
Published at: 2023 IEEE Globecom Workshops (GC Wkshps)
Publication Type: Conference Paper

Indoor Measurements for RIS-Aided Communication: Practical Phase Shift Optimization, Coverage Enhancement, and Physical Layer Security

Author: Kayraklik, S.
Other Authors: Yildirim, I., Hokelek, I., Gevez, Y., Basar, E., & Gorcin, A.
Published at: IEEE Open Journal of the Communications Society, 2024
Publication Type: Journal Article

Rapid CNN-Assisted Iterative RIS Element Configuration

Author: Kesir, S.
Other Authors: Yagan, M. Y., Hökelek, I., Pusane, A. E., & Görçin, A.
Published at: 2023 International Symposium on Networks, Computers and Communications (ISNCC)
Publication Type: Conference Paper

Practical Implementation of RIS-Aided Spectrum Sensing: A Deep-Learning-Based Solution

Author: Kayraklik, S.
Other Authors: Yildirim, I., Basar, E., Hokelek, I., & Gorcin, A.
Published at: IEEE Systems Journal, 2024
Publication Type: Journal Article

Indoor coverage enhancement for RIS-assisted communication systems: Practical measurements and efficient grouping

Author: Kayraklık, S.
Other Authors: Yildirim, I., Gevez, Y., Basar, E., & Gorcin, A.
Published at: ICC 2023 - IEEE International Conference on Communications
Publication Type: Conference Paper

Measurement-based characterization of physical layer security for RIS-assisted wireless systems

Author: Kesir, S.
Other Authors: Kayraklık, S., Hökelek, İ., Pusane, A. E., Basar, E., & Görçin, A.
Published at: 2023 IEEE 97th Vehicular Technology Conference (VTC2023-Spring)
Publication Type: Conference Paper

Comparison of Relay and Reconfigurable Intelligent Surfaces for Millimeter-Wave Communication Systems

Author: Çelebi, B. A.
Other Authors: Erdemir, U., & Gorçin, A.
Published at: 30th Signal Processing and Communications Applications Conference (SIU), Safranbolu, Turkey
Publication Type: Conference Paper

Outage Probability Analysis of RIS-aided FSO Under Exponentiated Weibull Distributed Turbulence

Author: Yuksekdag, Y.
Other Authors: Altunbas, I., Hökelek, I., & Coşkun, A. F.
Published at: 2023 31st Signal Processing and Communications Applications Conference (SIU)
Publication Type: Conference Paper

Error Performance of RIS-Assisted Space-Time Coded Network Under Time Selective Fading Environments

Author: Hasan Atalay Günel.
Other Authors: Tayfun Yılmaz, İbrahim Hökelek, Hacı İlhan.
Published at: IEEE ISCC 2024
Publication Type: Conference Paper

Channel Estimation based RIS Optimization

Author: Ahmet Esad Güneşer.
Other Authors: Berkay Şekeroğlu, Sefa Kayraklık, Erhan Karakoca.
Published at: VTC2025-Spring
Publication Type: Conference Paper

UAV-assisted RIS location optimization with ML

Author: Ahmet Muaz Aktaş.
Other Authors: İbrahim Altunbaş.
Published at: IGRS
Publication Type: Conference Paper

Indoor Measurements of Reconfigurable Intelligent Surfaces in 5G Millimeter-Wave Networks

Author: Cemil Karakuş.
Other Authors: Hakan Koçak, Sefa Kayraklık, Samed Keşir, Zehra Yiğit.
Published at: 2024 IEEE SIU
Publication Type: Conference Paper

N78 Frequency Band Modular RIS Design and Implementation

Author: Sefa Kayraklık.
Other Authors: Recep Baş, Hasan Oğuzhan Çalışkan, Samed Sahinoğlu, Sercan Erdoğan, İlhami Ünal, İbrahim Hökelek, Kıvanç Nurdan, Ali Görçin.
Published at: European Microwave-2025
Publication Type: Conference Paper

Reflect Array-Type Static Surfaces: Design and Experimental Evaluation in Outdoor mmWave Networks

Author: Samed Keşir.
Other Authors: Batuhan Kaplan, Zehra Yiğit, Emre Arslan, Ahmet Faruk Coşkun, Recep Baş , Sergiy Panın, İlhami Ünal, Sefa Kayraklık, Onur Salan, İbrahim Hökelek.
Published at: SoftCom 2025
Publication Type: Conference Paper

RIS Meets O-RAN: A Practical Demonstration of Multi-user RIS Optimization Through RIC

Author: Ali Fuat Şahin.
Other Authors: Onur Salan, İbrahim Hökelek, Ali Görçin.
Published at: IEEE EuCNC
Publication Type: Conference Paper

Adaptive Communication Through Exploiting RIS, SSK and CIM for Improved Reliability and Efficiency

Author: Ferhat Bayar
Other Authors: Onur Salan, E. Aydın, H. Ilhan.
Published at: PIMRC 2025
Publication Type: Conference Paper

AI Based Wireless Communication Signal Detection and Identification

Measurement-based Modulation Classification in Unlicensed Millimeter-Wave Bands

Author: Sümen, G.
Other Authors: Gorchin, A., & Qaraqe, K.
Published at: IEEE WCNC, 2023
Publication Type: Conference Paper

Multi-Channel Learning with Preprocessing for Automatic Modulation Order Separation

Author: Sümen, G.
Other Authors: Çelebi, B. A., Karabulut Kurt, G., Görçin, A., & Tedik Başaran, S.
Published at: IEEE ISCC, 30 June - 03 July 2022, Rhodes, Greece
Publication Type: Conference Paper

Application of Object Detection Approaches on the Wideband Sensing Problem

Author: Kayraklık, S.
Other Authors: Alagoz, Y., & Coskun, A. F.
Published at: IEEE International Black Sea Conference on Communications and Networking, pp. 341 - 346, Sofia, Bulgaria, 06-09 June 2022
Publication Type: Conference Paper

Detection, Identification, and Direction of Arrival Estimation of Drone FHSS Signals with Uniform Linear Antenna Array

Author: Kaplan, B.
Other Authors: Kahraman, I., Ekti, A. R., Yarkan, S., Görçin, A., Özdemir, M. K., & Çırpan, H. A.
Published at: IEEE Access, 2021
Publication Type: Journal Article

Robust and Fast Automatic Modulation Classification with CNN under Multipath Fading Channels

Author: Tekbıyık, K.
Other Authors: Ekti, A. R., Görçin, A., Karabulut Kurt, G., & Keçeci, C.
Published at: IEEE 91st Vehicular Technology Conference (VTC2020-Spring), 2020, pp. 1-6
Publication Type: Conference Paper

Multi-Dimensional Wireless Signal Identification Based on Support Vector Machines

Author: Tekbiyik, K.
Other Authors: Akbunar, Ö., Ekti, A. R., Gorçin, A., & Karabulut Kurt, G.
Published at: IEEE Access, vol. 7, pp. 138890-138903, 2019
Publication Type: Journal Article

On the Investigation of Wireless Signal Identification Using Spectral Correlation Function and SVMs

Author: Tekbiyik, K.
Other Authors: Akbunar, Ö., Ekti, A. R., Karabulut Kurt, G., & Görçin, A.
Published at: IEEE Wireless Communications and Networking Conference (WCNC), 2019, pp. 1-5
Publication Type: Conference Paper

Measurement Based Channel Characterization for Drone Communication Systems

Channel Characterization and Measurement Results for Drone-Based Communications in 5G Primary Frequency Band

Author: Erdemir, U.
Other Authors: Kaplan, B., Hökelek, I., Görçin, A., & Çırpan, H. A.
Published at: IEEE VTC2023-Spring, 2023
Publication Type: Conference Paper

Measurement-Based Large Scale Statistical Modeling of Air-to-Air Wireless UAV Channels via Novel Time-Frequency Analysis

Author: Ede, B.
Other Authors: Kaplan, B., Kahraman, I., Keşir, S., Yarkan, S., Ekti, A. R., Baykaş, T., Görçin, A., & Çırpan, H. A.
Published at: IEEE Wireless Communications Letters, Early Access, 2021
Publication Type: Journal Article

Measurement Based Statistical Channel Characterization of Air-to-Ground Path Loss Model at 446MHz for Narrow-Band Signals in Low Altitude UAVs

Author: Ede, B.
Other Authors: Yarkan, S., Ekti, A. R., Baykaş, T., Çırpan, H. A., & Görçin, A.
Published at: IEEE 91st Vehicular Technology Conference (VTC2020-Spring), 2020
Publication Type: Conference Paper

IHA'lar Üzerine Konuşlandırılmış TDOA Tabanlı Konumlandırma Sisteminin Performans İncelemesi

Author: Burak Ahmet Çelebi.
Other Authors: İbrahim Hökelek, M. Nuri Akıncı, Ali Görçin.
Published at: IEEE SIU 2024
Publication Type: Conference Paper

On Outage Analysis of OTFS Based LEO-Satellite Systems With HAPS Relaying

Author: Burak Ahmet Çelebi.
Other Authors: Ömer Faruk Akyol, Semiha Tedik Başaran, İbrahim Hökelek, Ali Görçin,
Published at: IEEE FNWF’24
Publication Type: Conference Paper

Medium Access Technologies

AI Based Resource and Power Allocation for NOMA Systems

Author: Karakuş, E. K.
Other Authors: Gemici, Ö. F., Hökelek, İ., & Çırpan, H. A.
Published at: IEEE BlackSea 2023 (July 2023)
Publication Type: Conference Paper

Fuzzy Logic Based Power Allocation for Cooperative NOMA Systems

Author: Durceylan, M. N.
Other Authors: Gemici, Ö. F., Özdemir, G., Hökelek, İ., & Çırpan, H. A.
Published at: International Balkan Conference on Communications and Networking (BalkanCom), 2022
Publication Type: Conference Paper

Multi-objective Resource Allocation for 5G Using Hierarchical Reinforcement Learning

Author: Akyildiz, H. A.
Other Authors: Gemici, Ö. F., Hökelek, İ., & Çırpan, H. A.
Published at: IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom), 2022
Publication Type: Conference Paper

Modeling Queuing Delay of 5G NR with NOMA under SINR Outage Constraint

Author: Gemici, Ö. F.
Other Authors: Hökelek, I., & Çırpan, H. A.
Published at: IEEE Transactions on Vehicular Technology 70 (3), 2389-2403, 2021
Publication Type: Journal Article

NOMA Power Allocation for Minimizing System Outage under Rayleigh Fading Channel

Author: Gemici, Ö. F.
Other Authors: Hökelek, I., & Çırpan, H. A.
Published at: IEEE 40th Sarnoff Symposium, 2019
Publication Type: Conference Paper

User Scheduling and Power Allocation for Nonfull Buffer Traffic in NOMA Downlink Systems

Author: Gemici, Ö. F.
Other Authors: Kara, F., Hökelek, I., & Çırpan, H. A.
Published at: International Journal of Communication Systems 32 (1), e3834, 2019
Publication Type: Journal Article

Low Complexity RCP-OTFS Systems with Fractional Doppler Shifts

Author: Hüseyin Samet Kara
Other Authors: A. Serbes, İ. Hökelek, A. Görçin.
Published at: 2024 IEEE SIU
Publication Type: Conference Paper

Hierarchical Reinforcement Learning Based Resource Allocation for RAN Slicing

Author: H. A. Akyıldız
Other Authors: Ö. F. Gemici, I. Hökelek, H. A. Çırpan.
Published at: IEEE Access
Publication Type: Conference Paper

A Pre-Emptive Scheduling Mechanism for Service Assurance of Network Slicing in Next Generation Cellular Networks

Author: E. Engin.
Other Authors:I. Hokelek, A. Gorcin and H. A. Cirpan.
Published at: in IEEE Access, vol. 13, pp. 23297-23311, 2025, doi: 10.1109/ACCESS.2025.3536997
Publication Type: Conference Paper

xApp-based Resource Allocation for Network Slices in End-to-End 5G System

Author: İ. E. Sarıdaş.
Other Authors: H. R. Enginoğlu and İ. Hökelek
Published at: 2025 33rd Signal Processing and Communications Applications Conference (SIU), Sile, Istanbul, Turkey, 2025, pp. 1-4, doi: 10.1109/SIU66497.2025.11112349.
Publication Type: Conference Paper

Time Sensitive Networks

Testing Deterministic Avionics Networks Using Orthogonal Arrays

Author: Altuntas, M. E.
Other Authors: Hökelek, İ., Şeker, M., Demir, S., Akdoğan, E., Kışla, P., & Akpolat, E. C.
Published at: 15th International Conference on Mobile Ubiquitous Computing Systems, Services and Technologies (UBICOMM), 2021. (Best Paper Award)
Publication Type: Conference Paper

Delay Optimization for Switchless ARINC 664 Mesh Networks with Cyclic Dependencies

Author: Kaya, S.
Other Authors: Gül, B., Demir, M. S., Hökelek, I., Coleri, S., Garip, M., & Üvet, H.
Published at: IEEE Latin-American Conference on Communications (LATINCOM), 2021
Publication Type: Conference Paper

Priority Re-assignment for Improving Schedulability and Mixed-Criticality of ARINC 664

Author: Yeniaydın, M.
Other Authors: Gemici, Ö. F., Demir, M. S., Hökelek, İ., Coleri, S., & Tureli, U.
Published at: IFIP Networking Conference (IFIP Networking), 2021
Publication Type: Conference Paper

Genetic Algorithm Based ARINC 664 Mixed Criticality Optimization Using Network Calculus

Author: Akpolat, E. C.
Other Authors: Gemici, Ö. F., Demir, M. S., Hökelek, İ., Coleri, S., & Çırpan, H. A.
Published at: IEEE International Conference on Communications Workshops (ICC Workshops), 2021
Publication Type: Conference Paper

A Fault Tolerant Software Defined Networking Architecture for Integrated Modular Avionics

Author: Cevher, S.
Other Authors: Mumcu, A., Caglan, A., Kurt, E., Peker, M. K., Hökelek, I., & Altun, S.
Published at: IEEE/AIAA 37th Digital Avionics Systems Conference (DASC), 2018
Publication Type: Conference Paper