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Publications

103 peer-reviewed articles (52 journal and 51 conference papers), 2 books and book chapters, and 8 patents, patent applications, and invention disclosures. This list matches my CV; newest first, numbered as in the CV.

Supervised student co-authors: Ph.D.*, M.Sc./MSET**, B.Sc.***. Titles link to the paper (DOI) where one is available.

CV (PDF) Google Scholar

Journal articles in preparation

Not yet submitted; not counted in totals

  1. Waste Factor as a Graph Optimization Metric: Theory and Bellman–Ford-Aligned Neural Execution for Energy-Optimal Multi-Hop RoutingN. Sevim*, M. Ibrahim, S. Ekin, and T. S. RappaportTo be submitted to IEEE Transactions on Green Communications and Networking, 2026
  2. Waste-Factor Energy per Bit as a Routing Cost for mmWave UAV Relays: Planner Gains, Local Forwarding, and the Value of Channel InformationN. Sevim*, M. Ibrahim, S. Ekin, and T. S. RappaportTo be submitted to IEEE Transactions on Green Communications and Networking, 2026
  3. Simulation-Based Optimistic Policy Iteration in Multi-Agent MDPs with Kullback-Leibler Control CostK. Nakhleh*, S. Aydin, C. Eksin, and S. EkinTo be submitted to IEEE Transactions on Automatic Control, 2026
  4. Integrated Sensing and Communications: A Tutorial on Mathematical Foundations, Signal Processing and System Design for 6GS. EkinArXiv:2609.22314, Sept. 2026; to be submitted to IEEE Communications Surveys & Tutorials
  5. Prime Spectrum, Better Use: A National Proposal for Selective Migration of Line-of-Sight Services from Below to Above 10 GHzS. Ekin, M. Ibrahim, M. Saadat*, A. Sprintson, and T. S. RappaportArXiv preprint, 2026; to be submitted to IEEE Communications Magazine
  6. Block Phase Tracking Reference Signal (PTRS) Allocation for DFT-s-OFDMM. Ibrahim, S. Ekin, Y. Tsai, and R. PragadaTo be submitted to IEEE Open Journal of the Communications Society, 2026

Journal articles under review

Submitted manuscripts; not counted in totals

  1. An Ultra-Wideband Power Divider Based on a Ground-Backed Aperture Spoof Surface Plasmon Polariton LineA. Tag*, S. Ekin, M. S. Anzum, A. Menon, H. Al Nuweiri, and M. F. KarimSubmitted to IEEE Microwave and Wireless Technology Letters, 2026
  2. Broadband Ka-Band Six-Port Junction Using Double-Sided Spoof Surface Plasmon PolaritonA. Tag*, S. Ekin, M. S. Anzum, A. Menon, H. Al Nuweiri, and M. F. KarimSubmitted to IEEE Transactions on Microwave Theory and Techniques, 2026
  3. An Array Antenna Approach to Near Field SAR: Theory, Design and ValidationS. Kim*, S. Ekin, and M. F. KarimSubmitted to IEEE Transactions on Antennas and Propagation, 2026
  4. Minimizing Energy Consumption Based on Waste Factor in Multi-User Multi-Relay SystemsN. Sevim*, M. Ibrahim, S. Ekin, and T. S. RappaportSubmitted to IEEE Transactions on Green Communications and Networking, 2026
  5. Learning to Reflect: Hierarchical Multi-Agent Reinforcement Learning for CSI-Free mmWave Beam-FocusingH. Le*, M. Ibrahim, O. Bedir*, J. Tao, and S. EkinSubmitted to IEEE Transactions on Machine Learning in Communications and Networking, 2026
  6. Can a Passive Reflector Replace an Access Point? Joint Indoor Placement of Access Points and Reflectors via Differentiable Ray TracingH. Le*, M. Ibrahim, J. Tao, and S. EkinSubmitted to IEEE Open Journal of the Communications Society, 2026

Preprints

Not peer-reviewed; not counted in totals

  1. If AI Is the Calculator of Our Era, What Is the New “Math”?S. EkinTechRxiv Preprints, 2025
  2. The Subtle Hand of AI: How AI Agents May Coordinate and Influence Human ActionsM. Ibrahim*, H. Celebi, and S. EkinTechRxiv Preprints, 2025

Journal articles

Peer-reviewed, published or accepted

2026

  1. The Anatomy of RF Chains: Metrics, Measures, and Operating EfficiencyL. Belostotski, A. Madanayake, J. Nielsen, M. Ibrahim, X. Liu, X. Wang, G. Qian, S. Ekin, and T. S. RappaportIEEE Microwave Magazine, early access, pp. 2–16, 2026
  2. Artificial Intelligence in Engineering Technology: Opportunities, Challenges, and Future OutlookS. Ekin, F. El Breidi, M. Saadat*, and M. MetwalyJournal of Engineering Technology (JET), accepted, Fall 2026Invited Paper; Featured Article
  3. 3D-Printed mmWave Quasi-Holographic Antenna for 2D BeamformingA. Tag*, S. Ekin, H. Al Nuweiri, A. E. Patterson, M. P. Mohan, A. Alphones, H. T. S. Henry, and M. F. KarimIEEE Open Journal of Antennas and Propagation, vol. 7, no. 2, pp. 417–426, 2026
  4. Prompt Engineering for ChatGPT: A Quick Guide to Techniques, Tips, and Best PracticesS. EkinJournal of Engineering Technology (JET), vol. 43, no. 1, pp. 52–68, 2026As of Oct. 2026: 122,052 views, 17,879 downloads, and 680 Google Scholar citations
  5. Enhanced Efficiency and Accuracy for Synthetic Aperture Radar Image Reconstruction Based on Hybrid Range Migration and Back Projection AlgorithmG. Gannon**, M. Macorol, A. Garcia, I. Godage, B. Zoghi, S. Ekin, and M. F. KarimInternational Journal of Microwave and Wireless Technologies, vol. 18, no. 2, pp. 173–182, 2026
  6. Artificial intelligence and additive manufacturing as a coupled design system: Rethinking inference, manufacturability, and design educationC. Chadha, G. Crosby, S. Ekin, M. Gharib, E. Hammad, C. Jin, A. A. Malik, N. M. Diaz, C. Mollan, G. Nzebuka, V. Pandey, J. Park, M. Ramoni, D. Song, B. Vajipeyajula, and A. E. PattersonInternational Journal of AI for Materials and Design, vol. 3, no. 1, art. 34, 2026
  7. Signal Whisperers: Enhancing Wireless Reception Using DRL-Guided Reflector ArraysH. Le*, O. Bedir*, M. Ibrahim, J. Tao, and S. EkinIEEE Transactions on Machine Learning in Communications and Networking, vol. 4, pp. 265–281, 2026

2025

  1. A Perspective on the Impact of Group Delay Dispersion in Future Terahertz Wireless NetworksK. Strecker*, S. Ekin, and J. F. O'HaraIEEE Communications Magazine, vol. 63, no. 3, pp. 190–196, Mar. 2025
  2. Promoting Rural Entrepreneurship through Technology: A Case Study Using Productivity Enhancing Technology Experience Kits (PETE-Kits)M. W. Rutherford, B. E. Whitacre, L. Captain***, S. Ekin, J. Angle, T. Hensley, and J. F. O'HaraIEEE Transactions on Education, vol. 68, no. 3, pp. 281–292, June 2025
  3. Theoretical foundations of waste factor and waste figure with applications to fixed wireless access and relay systemsN. Sevim*, M. Ibrahim, S. Ekin, and T. S. Rappaportnpj Wireless Technology (Nature Portfolio), vol. 1, no. 1, art. 2, 2025
  4. Free-Space Optical Channel Turbulence Prediction: A Machine Learning ApproachMd Z. Islam*, E. Abele*, F. F. Hossain, A. Ahmad, S. Ekin, and J. F. O'HaraIEEE Communications Letters, vol. 29, no. 5, pp. 1126–1130, May 2025
  5. Risk-Aware Reinforcement Learning Framework for User-Centric O-RANS. K. Kasi*, F. A. Khan, S. Ekin, and A. ImranIEEE Transactions on Machine Learning in Communications and Networking, vol. 3, pp. 195–214, 2025
  6. Optimizing Non-Terrestrial Hybrid RF/FSO Links With Reinforcement Learning: Navigating Through CloudsA. Almohamad*, M. Ibrahim*, S. Ekin, M. Hasna, S. Althunibat, and K. QaraqeIEEE Open Journal of the Communications Society, vol. 6, pp. 793–806, 2025Top 5 Most Popular Papers in Reinforcement Learning in IEEE Open Journal of the Communications Society
  7. User-Centric Communication With Aerial Network for 6G: A Reinforcement Learning ApproachS. K. Kasi*, F. A. Khan, S. Ekin, and A. ImranIEEE Transactions on Aerospace and Electronic Systems, vol. 61, no. 2, pp. 3137–3151, April 2025

2024

  1. Anticipating Optical Availability in Hybrid RF/FSO Links Using RF Beacons and Deep LearningM. Ibrahim*, A. Ahmad, S. Ekin, P. LoPresti, S. Altunc, O. Kegege, and J. F. O'HaraIEEE Transactions on Machine Learning in Communications and Networking, vol. 2, pp. 1369–1388, 2024
  2. Noncontact Respiratory Anomaly Detection Using Infrared Light-Wave SensingMd Z. Islam*, B. Martin***, C. Gotcher***, T. Martinez***, J. F. O'Hara, and S. EkinIEEE Transactions on Human-Machine Systems, vol. 54, no. 3, pp. 292–303, June 2024
  3. Buyers Collusion in Incentivized Forwarding Networks: A Multi-Agent Reinforcement Learning StudyM. Ibrahim*, S. Ekin, and A. ImranIEEE Transactions on Machine Learning in Communications and Networking, vol. 2, pp. 240–260, 2024
  4. Fundamental limits of light-wave sensing for non-contact respiration monitoringB. Martin*, Md Z. Islam*, C. Gotcher***, T. Martinez***, S. Ekin, and J. F. O'HaraBiomedical Optics Express, vol. 15, no. 11, pp. 6449–6468, 2024

2023

  1. Real-Time Traffic End-of-Queue Detection and Tracking in UAV VideoR. Messenger*, Md Z. Islam*, M. Whitlock***, E. Spong***, N. Morton***, L. Claggett***, C. Matthews***, et al., and S. EkinInternational Journal of Intelligent Transportation Systems Research, vol. 21, no. 3, pp. 493–505, 2023
  2. Time-Frequency Warped Waveforms for Well-Contained Massive Machine Type CommunicationsM. Ibrahim*, H. Arslan, H. A. Cirpan, and S. EkinIEEE Journal on Selected Areas in Communications, vol. 41, no. 6, pp. 1900–1917, June 2023
  3. D-RAN: A DRL-Based Demand-Driven Elastic User-Centric RAN Optimization for 6G & BeyondS. K. Kasi*, U. S. Hashmi, S. Ekin, A. Abu-Dayya, and A. ImranIEEE Transactions on Cognitive Communications and Networking, vol. 9, no. 1, pp. 130–145, Feb. 2023

2022

  1. Soil Moisture Monitoring Through UAS-Assisted Internet of Things LoRaWAN Wireless Underground SensorsF. F. Hossain*, R. Messenger**, G. L. Captain***, S. Ekin, J. D. Jacob, S. Taghvaeian, and J. F. O'HaraIEEE Access, vol. 10, pp. 102107–102118, 2022
  2. Toward a Hybrid RF/Optical Lunar Communication System (LunarComm)W. Raza*, E. Abele*, J. F. O'Hara, A. Imran, W. Choi, I. Song, P. LoPresti, S. Altunc, O. Kegege, and S. EkinIEEE Network, vol. 36, no. 6, pp. 76–83, 2022
  3. Fundamental Performance Limits on Terahertz Wireless Links Imposed by Group Velocity DispersionK. Strecker*, S. Ekin, and J. F. O'HaraIEEE Transactions on Terahertz Science and Technology, vol. 12, no. 1, pp. 87–97, Jan. 2022

2021

  1. Embracing Complexity: Agent-based Modeling for HetNets Design and Optimization via Concurrent Reinforcement Learning AlgorithmsM. Ibrahim*, U. S. Hashmi, M. Nabeel, A. Imran, and S. EkinIEEE Transactions on Network and Service Management, vol. 18, no. 4, pp. 4042–4062, Dec. 2021
  2. Hybrid RF/VLC Systems: A Comprehensive Survey on Network Topologies, Performance Analyses, Applications, and Future DirectionsH. Abuella*, M. Elamassie, M. Uysal, Z. Xu, E. Serpedin, K. A. Qaraqe, and S. EkinIEEE Access, vol. 9, pp. 160402–160436, 2021
  3. Dispersion from Diffuse Reflectors and its Effect on Terahertz Wireless Communication PerformanceR. Messenger**, K. Strecker*, S. Ekin, and J. F. O'HaraIEEE Transactions on Terahertz Science and Technology, vol. 11, no. 6, pp. 695–703, Nov. 2021
  4. TV White Space Based Wireless Broadband Internet Connectivity: A Case Study in Oklahoma, USAMd Z. Islam*, J. F. O'Hara, T. Ochsner, and S. EkinIEEE Open Journal of the Communications Society, vol. 2, pp. 2449–2462, 2021
  5. SpiderNet: Spectrally Efficient and Energy Efficient Data Aided Demand Driven Elastic Architecture for 6GM. Nabeel, U. S. Hashmi, S. Ekin, H. Refai, A. Abu-Dayya, and A. ImranIEEE Network, vol. 35, no. 5, pp. 256–263, Sept. 2021
  6. M-ary Quadrature Amplitude Modulation Order Optimization for Terahertz Wireless Communication over Dispersive ChannelsK. Strecker*, S. Ekin, and J. F. O'HaraITU Journal on Future and Evolving Technologies (Special Issue on Terahertz Communications), vol. 2, no. 7, pp. 21–30, 2021
  7. Analysis of Area Spectral and Energy Efficiency in a CoMP-Enabled User-Centric Cloud RANS. K. Kasi*, U. S. Hashmi, M. Nabeel, S. Ekin, and A. ImranIEEE Transactions on Green Communications and Networking, vol. 5, no. 4, pp. 1999–2015, Dec. 2021
  8. Emulating UAV Motion by Utilizing Robotic Arm for mmWave Wireless Channel CharacterizationA. Kachroo*, C. A. Thornton***, Md A. R. Sarker, W. Choi, H. Bai, I. Song, J. F. O'Hara, and S. EkinIEEE Transactions on Antennas and Propagation, vol. 69, no. 10, pp. 6691–6701, Oct. 2021
  9. A Do-It-Yourself (DIY) Light Wave Sensing and Communication Project: Low-Cost, Portable, Effective, and FunS. Ekin, J. F. O'Hara, E. Turgut, N. Colston, and J. L. YoungIEEE Transactions on Education, vol. 64, no. 3, pp. 205–212, Aug. 2021

2020

  1. Non-Contact Vital Signs Monitoring Through Visible Light SensingH. Abuella* and S. EkinIEEE Sensors Journal, vol. 20, no. 7, pp. 3859–3870, Apr. 2020
  2. Towards Non-Contact Glucose Sensing in Aqueous Turbid Medium at 1.1 Meters DistanceD. Piao, J. F. O'Hara, S. Bukkapatnam, and S. EkinIEEE Photonics Journal, vol. 12, no. 4, art. 3700523, 2020
  3. Joint User Grouping and Decoding Order in Uplink/Downlink MISO/SIMO-NOMAD. -T. Do, T. -L. Nguyen, S. Ekin, Z. Kaleem, and M. VoznakIEEE Access, vol. 8, pp. 143632–143643, 2020
  4. Interference Spreading through Random Subcarrier Allocation Technique and Its Error Rate Performance in Cognitive Radio NetworksA. Kachroo*, A. Popuri**, M. Ibrahim*, A. Imran, and S. EkinSensors (MDPI), vol. 20, no. 19, p. 5700, 2020
  5. Gesture Recognition using Reflected Visible and Infrared Light Wave SignalsL. Yu**, H. Abuella*, J. F. O'Hara, C. Crick, and S. EkinIEEE Transactions on Human-Machine Systems, vol. 51, no. 1, 2020
  6. Statistical Modelling of Dynamic Interference Threshold and Its Effect on Network CapacityA. Kachroo*, S. Ekin, and A. ImranIEEE Transactions on Vehicular Technology, vol. 69, no. 5, pp. 5102–5114, May 2020
  7. Compensating Atmospheric Channel Dispersion for Terahertz Wireless CommunicationK. Strecker**, S. Ekin, and J. F. O'HaraScientific Reports (Nature Portfolio), vol. 10, art. 5816, 2020

2019

  1. ViLDAR: Visible Light Sensing-Based Speed Estimation Using Vehicle HeadlampsH. Abuella*, F. Miramirkhani, S. Ekin, M. Uysal, and S. AhmedIEEE Transactions on Vehicular Technology, vol. 68, no. 11, pp. 10406–10417, Nov. 2019
  2. Unmanned Aerial Vehicle-to-Wearables (UAV2W) Indoor Radio Propagation Channel Measurements and ModelingA. Kachroo*, S. Vishwakarma**, J. N. Dixon**, H. Abuella*, A. Popuri**, Q. H. Abbasi, C. F. Bunting, J. D. Jacob, and S. EkinIEEE Access, vol. 7, pp. 73741–73750, 2019
  3. A Perspective on Terahertz Next-Generation Wireless CommunicationsJ. F. O'Hara, S. Ekin, W. Choi, and I. SongMDPI Technologies Journal, vol. 7, no. 2, art. 43, 2019
  4. RSSI-Based Localization using LoRaWAN TechnologyH. Kwasme**, and S. EkinIEEE Access, vol. 7, pp. 99856–99866, 2019
  5. Uplink Achievable Rate in Underlay Random Access OFDM-Based Cognitive Radio NetworksH. Kong, S. Ekin, E. Serpedin, and K. A. QaraqeEURASIP Journal on Wireless Communications and Networking, vol. 2019, art. 22, 2019

2018

  1. Joint Spectrum Sensing and Resource Allocation in Multi-Band Multi-User Cognitive Radio NetworksX. Wang, S. Ekin, and E. SerpedinIEEE Transactions on Communications, vol. 66, no. 8, pp. 3281–3293, Aug. 2018

2013

  1. A Study on Inter-Cell Subcarrier Collisions due to Random Access in OFDM-Based Cognitive Radio NetworksS. Ekin, M. Abdallah, K. A. Qaraqe, and E. SerpedinIEEE Transactions on Communications, vol. 61, no. 5, pp. 1695–1707, May 2013
  2. Performance of Cognitive Radios in Dynamic Fading Channels under Primary Outage ConstraintA. K. Farraj, and S. EkinSpringer Wireless Personal Communications, vol. 73, no. 3, pp. 637–649, 2013
  3. Performance Analysis of Cognitive Radio Multiple-Access Channels Over Dynamic Fading EnvironmentsK. A. Qaraqe, S. Ekin, T. Agarwal, and E. SerpedinSpringer Wireless Personal Communications, vol. 68, no. 3, pp. 1031–1045, Feb. 2013

2012

  1. Capacity Limits of Spectrum Sharing Systems Over Hyper-Fading ChannelsS. Ekin, F. Yilmaz, H. Celebi, K. A. Qaraqe, M.-S. Alouini, and E. SerpedinWiley Wireless Communications and Mobile Computing, vol. 12, no. 16, pp. 1471–1480, 2012
  2. Random Subcarrier Allocation in OFDM-Based Cognitive Radio NetworksS. Ekin, M. Abdallah, K. A. Qaraqe, and E. SerpedinIEEE Transactions on Signal Processing, vol. 60, no. 9, pp. 4758–4774, Sept. 2012

2011

  1. Performance Analysis of Ad Hoc Dispersed Spectrum Cognitive Radio Networks over Fading ChannelsK. A. Qaraqe, H. Celebi, M. Mohammad, and S. EkinEURASIP Journal on Wireless Communications and Networking, vol. 2011, art. 849105, 2011

Conference papers under review

Submitted manuscripts; not counted in totals

  1. An Optically Transparent Leaky-Wave AntennaA. Tag*, S. Ekin, H. Al Nuweiri, and M. F. KarimSubmitted to International Symposium on Microwave, Antenna, and Propagation (SMAP 2027), 2026
  2. Inter-Numerology Interference Reduction via Adjacent Symbol Mid-ZerosM. Ibrahim, S. Ekin, and A. R. EktiSubmitted to IEEE International Conference on Communications (ICC 2027), 2026
  3. Bypassing the CSI Bottleneck: MARL-Driven Spatial Control for Reflector ArraysH. Le*, M. Ibrahim, O. Bedir*, J. Tao, and S. EkinSubmitted to IEEE International Conference on Communications (ICC 2027), 2026
  4. Deep Unfolding Learning-Based Digital Precoding and RF Chain Selection Design for Energy-Efficient Multi-User MIMO-OFDM ISAC SystemsO. Bedir*, M.-C. Lee, Y.-C. Huang, and S. EkinSubmitted to IEEE International Conference on Communications (ICC 2027), 2026
  5. Waste-Factor-Aware Multi-Relay Assignment: Admission and Energy TradeoffsN. Sevim*, M. Ibrahim, S. Ekin, and T. S. RappaportSubmitted to IEEE International Conference on Communications (ICC 2027), 2026
  6. Service-Preserving Migration of C-Band Satellite Distribution Links to Ku and Ka BandsM. Saadat*, S. Ekin, M. Ibrahim, A. Sprintson, and T. S. RappaportSubmitted to IEEE International Conference on Communications (ICC 2027), 2026

Conference papers

Peer-reviewed

2026

  1. Learning to Focus: CSI-Free Hierarchical MARL for Reconfigurable ReflectorsH. Le*, M. Ibrahim, O. Bedir*, J. Tao, and S. EkinIEEE Global Communications Conference (GLOBECOM), Macau, China, Dec. 2026 (accepted)
  2. Quantifying the Reality Gap for RL-Based UAV Placement at mmWave and Sub-THzA. Almohamad*, M. Ibrahim, S. Ekin, and K. A. QaraqeIEEE Global Communications Conference (GLOBECOM), Macau, China, Dec. 2026 (accepted)
  3. Experimental Study of ILS Recovery Under Propeller Modulation Using a Reference ToneS. Mostafa, P. Radhakrishnan, M. Ibrahim, S. Ekin, and S. S. JehangirIEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (AP-S/URSI), Detroit, MI, USA, July 12–17, 2026

2025

  1. Masked Symbol Modeling for Demodulation of Oversampled Baseband Communication Signals in Impulsive Noise-Dominated ChannelsO. Bedir*, N. Sevim*, M. Ibrahim, and S. EkinNeurIPS 2025 Workshop: AI and ML for Next-Generation Wireless Communications and Networking, San Diego, CA, USA, Dec. 2–7, 2025
  2. Fictitious Play in Product Markov Games with Kullback-Leibler Control CostK. Nakhleh*, S. Aydin, C. Eksin, and S. EkinIEEE 59th Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, Oct. 26–29, 2025
  3. Fictitious Play in Product Markov Games with Kullback-Leibler Control CostK. Nakhleh*, S. Aydin, C. Eksin, and S. EkinDynamics at the Frontiers of Optimization, Sampling, and Games Workshop at NeurIPS, San Diego, CA, Dec. 2025
  4. 3D-Printed Hexagonal Cylinder Leaky-Wave Antenna for Omnidirectional CoverageA. Tag*, S. Ekin, H. Al Nuweiri, M. P. Mohan, A. Alphones, T. S. Herng, and M. F. KarimIEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, Ottawa, ON, Canada, 2025, pp. 2692–2695

2024

  1. Guiding Wireless Signals with Arrays of Metallic Linear Fresnel Reflectors: A Low-cost, Frequency-versatile, and Practical ApproachH. Le*, O. Bedir*, M. Ibrahim, J. Tao, and S. EkinIEEE 100th Vehicular Technology Conference (VTC2024-Fall), Washington, DC, USA, 2024, pp. 1–7
  2. Large Language Models (LLMs) Assisted Wireless Network Deployment in Urban SettingsN. Sevim*, M. Ibrahim, and S. EkinIEEE 100th Vehicular Technology Conference (VTC2024-Fall), Washington, DC, USA, 2024, pp. 1–7
  3. Traffic-Aware Network Slicing for 5G Networks in Cloud Fog-RAN over WDM ArchitectureM. Ahsan, A. Ahmed, S. Ekin, J. F. O'Hara, and A. AhmadInternational Conference on Smart Applications, Communications and Networking (SmartNets), Harrisonburg, VA, USA, 2024, pp. 1–6
  4. Wide-Band mmWave Rotman Lens-AVA for Beamforming ApplicationsA. Tag*, S. Ekin, H. Al Nuweiri, M. Prabhakaran, A. Alphones, and M. F. KarimIEEE International Symposium on Antennas and Propagation and ITNC-USNC-URSI Radio Science Meeting, Florence, Italy, July 14–19, 2024
  5. Optimization of 1D-CNN for Non-Contact Respiration Pattern ClassificationMd Z. Islam*, S. Ekin, J. F. O'Hara, and G. G. YenNAFIPS International Conference on Fuzzy Systems, Soft Computing, and Explainable AI, South Padre Island, TX, May 27–29, 2024
  6. Propeller Modulation Equalization via Reference TonesM. Ibrahim* and S. EkinIEEE Military Communications Conference (MILCOM), Washington, DC, USA, 2024, pp. 1–5
  7. Respiratory Anomaly Detection Using Reflected Infrared Light-Wave SignalsMd Z. Islam*, B. Martin*, C. Gotcher***, T. Martinez***, J. F. O'Hara, and S. EkinWireless Telecommunications Symposium (WTS), Oakland, CA, Apr. 2024
  8. Analysis and Empirical Validation of Visible Light Path Loss Model for Vehicular Sensing and CommunicationH. Abuella*, Md Z. Islam*, R. Messenger***, J. F. O'Hara, and S. EkinInternational Conference on Computing, Networking and Communications (ICNC), Big Island, HI, Feb. 19, 2024

2023

  1. Channel Measurements for Switching Strategies in Hybrid RF/Optical CommunicationsE. Abele*, S. Altunc, O. Kegege, K. Ryder, B. Azimi, M. Campola, K. Lynaugh, G. Barnaba, P.G. LoPresti, S. Ekin, and J. F. O'HaraIEEE Aerospace Conference, 2023, pp. 1–11
  2. Warping Functions Design for Long Warped ZT-DFT-s-OFDMM. Ibrahim*, S. Ekin, and A. R. EktiIEEE Military Communications Conference (MILCOM), Boston, MA, USA, 2023, pp. 280–285
  3. Positioning Error Impact Compensation through Data-Driven Optimization in User-Centric NetworksW. Raza*, F. A. Khan, M. U. B. Farooq, S. Ekin, and A. ImranIEEE Global Communications Conference (GLOBECOM), Kuala Lumpur, Malaysia, Dec. 4–8, 2023
  4. Two-Port Characterization of Symmetric Varactors in 65-nm CMOS Process for Mixer ApplicationsS. Azmeen-ur-Rahman, M. O. Hasna, S. Ekin, and W. ChoiIEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS), Waco, TX, USA, 2023, pp. 1–4
  5. Enhancing Performance in Hybrid RF/FSO Systems: Leveraging Level Crossing Rate for Seamless SwitchingA. Almohamad*, S. Ekin, M. Hasna, and K. A. QaraqeIEEE International Black Sea Conference on Communications and Networking (BlackSeaCom), Istanbul, Türkiye, 2023, pp. 289–293
  6. Learning-Aided Demand-Driven Elastic Architecture for 6G & BeyondS. K. Kasi*, U. S. Hashmi, S. Ekin, and A. ImranIEEE 97th Vehicular Technology Conference (VTC2023-Spring), Florence, Italy, June 19–23, 2023
  7. Hand Gesture Recognition through Reflected Infrared Light Wave SignalsL. Yu**, H. Abuella*, Md Z. Islam*, J. F. O'Hara, C. Crick, and S. Ekin10th International Conference on Electrical and Electronics Engineering (ICEEE), Istanbul, Türkiye, May 8–10, 2023

2022

  1. Flight and Direct to Earth/Space Relay Communication System Architecture for GSFC CubeSat MissionsE. Abele*, S. Altunc, O. Kegege, K. Ryder, B. Azimi, M. Campola, K. Lynaugh, G. Barnaba, S. Ekin, and J. F. O'Hara36th Annual Small Satellite Conference, Logan, UT, 2022
  2. Complex Agent-based Modeling for HetNets Design and OptimizationM. Ibrahim*, U. S. Hashmi, M. Nabeel, A. Imran, and S. EkinInternational Conference on 6G Networking (6GNet), Paris, France, July 6–8, 2022
  3. Is CoMP Beneficial In User-Centric Cloud RAN?S. K. Kasi*, U. S. Hashmi, M. Nabeel, S. Ekin, and A. ImranInternational Conference on 6G Networking (6GNet), Paris, France, July 6–8, 2022
  4. Propeller Effects on mmWave UAV Channels: A Statistical and Empirical Modeling StudyH. S. Cankurtaran, A. Kachroo*, W. Choi, J. F. O'Hara, S. Yarkan, K. Qaraqe, M. Hasna, and S. EkinIEEE International Black Sea Conference on Communications and Networking (BlackSeaCom), Sofia, Bulgaria, June 6–9, 2022
  5. Towards Positioning Error Impact Characterization and Minimization in User-Centric RANW. Raza*, U. S. Hashmi, A. Imran, and S. EkinIEEE Wireless Communications and Networking Conference (WCNC), Austin, TX, Apr. 10–13, 2022
  6. S-band Network Analysis and Strategies for LEO Multi-CubeSat Science MissionsE. Abele*, S. Altunc, O. Kegege, B. Azimi, S. Ekin, and J. F. O'HaraIEEE Aerospace Conference, Big Sky, MT, Mar. 5–12, 2022
  7. Unmanned Measurement of an ILS System Using a Software Defined RadioT. Mitchell, S. Ekin, J. West, M. Ibrahim*, J. Jacob, D. Johnson, and K. RothAmerican Institute of Aeronautics and Astronautics (AIAA) SciTech Forum, San Diego, CA, Jan. 3–7, 2022

2021

  1. Towards High Data Rate Hybrid RF/Optical Lunar Communication ArchitectureE. Abele*, W. Raza*, J. F. O'Hara, A. Imran, W. Choi, I. Song, P. LoPresti, S. Altunc, O. Kegege, and S. EkinSmall Satellite Conference, Logan, UT, Aug. 2021
  2. De-embedding Motion Artifacts from Robotic Arm Assisted Propagation MeasurementsC. Thornton***, A. Kachroo*, H. Bai, S. Ekin, and W. ChoiIEEE Texas Symposium on Wireless and Microwave Circuits and Systems, Virtual, May 18–20, 2021

2020

  1. Non-Contact Vital Signs Monitoring Through Visible Light SensingH. Abuella* and S. EkinIEEE Sensors Conference, Virtual, Oct. 25–28, 2020

2019

  1. Bias Allocation and Precoding for Tricolor Visible Light Communications with Signal-dependent NoiseQ. Gao, S. Ekin, K. A. Qaraqe, and E. Serpedin25th Asia-Pacific Conference on Communications (APCC), Ho Chi Minh City, Vietnam, Nov. 6–8, 2019Best Paper Award
  2. Capacity Maximizing Power Allocation for Multi-Channel Visible Light CommunicationsQ. Gao, S. Ekin, K. A. Qaraqe, and E. SerpedinIEEE International Smart Cities Conference (ISC2): Africa Smart Sustainable Cities & Communities Workshop, Casablanca, Morocco, Oct. 14–17, 2019
  3. A New Paradigm for Non-contact Vitals Monitoring using Visible Light SensingH. Abuella* and S. EkinIEEE International Conference on Sensing, Communication and Networking (SECON), Boston, MA, USA, June 10–13, 2019
  4. An Innovative Implementation of Visible Light Sensing for Quantifying the Dynamic Response of Bridge GirdersH. Abuella*, O. Khandel, M. Soliman, and S. Ekin9th International Conference on Structural Health Monitoring of Intelligent Infrastructure (SHMII-9), St. Louis, MO, Aug. 4–7, 2019
  5. Wireless Sensing using Vehicle Headlamps for Intelligent Transportation Systems: Proof of ConceptH. Abuella*, S. Ekin, S. Ahmed, F. Miramirkhani, B. Kebapci, and M. UysalTran-SET Annual Conference, San Antonio, TX, April 11–12, 2019; MATEC Web of Conferences, vol. 271, p. 06004, EDP Sciences, 2019

2018

  1. Impact of Secondary User Interference on Primary Network in Cognitive Radio SystemsA. Kachroo* and S. EkinIEEE 88th Vehicular Technology Conference (VTC2018-Fall), Chicago, IL, Aug. 27–30, 2018
  2. Indoor Occupancy Estimation using Visible Light Sensing (VLS) SystemM. A. Mestiraihi**, H. Abuella*, and S. EkinIEEE 88th Vehicular Technology Conference (VTC2018-Fall), Chicago, IL, Aug. 27–30, 2018
  3. Joint Decision of Sensing Threshold and Power Allocation in OFDM Cognitive Radio NetworksX. Wang, S. Ekin, and E. SerpedinIEEE International Conference on Communications (ICC), Kansas City, MO, May 20–24, 2018

2017

  1. Position at Response: A Novel Highly Accurate and Low Cost Laser Positioning SystemT. S. Dervish***, C. G. Teague***, F. Liu***, A. Coffey***, A. Kachroo*, S. Ekin, and J. S. KrasinskiInternational Telecommunications Conference (ITELCON), Istanbul, Türkiye, Dec. 28–29, 2017Best Paper Award
  2. ViLDAR: A Novel Speed Estimation System using Visible Light in VehiclesH. Abuella*, S. Ekin, and M. UysalIEEE 38th Sarnoff Symposium, Newark, NJ, Sept. 18–20, 2017
  3. Fair resource Allocation in Downlink OFDM-based Cognitive Radio NetworksX. Wang, S. Ekin, K. A. Qaraqe, and E. SerpedinInternational Symposium on Signals, Circuits and Systems (ISSCS), Iasi, Romania, July 2017
  4. Optimal resource Allocation for Downlink OFDM-based Cognitive Radio NetworksX. Wang, S. Ekin, and E. SerpedinInternational Symposium on Networks, Computers and Communications (ISNCC), Marrakech, Morocco, May 16–18, 2017

2013

  1. An Investigation of Inter-cell Subcarrier Collisions in OFDM-Based Cognitive Radio NetworksS. Ekin, M. Abdallah, K. A. Qaraqe, and E. SerpedinIEEE 14th Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Darmstadt, Germany, June 2013
  2. On the Capacity of a Cognitive User with Subcarrier Collisions over Rayleigh Fading ChannelsS. Ekin, M. Abdallah, K. A. Qaraqe, and E. Serpedin9th Advanced International Conference on Telecommunications (AICT), Rome, Italy, June 2013

2012

  1. On OFDM-Based Cognitive Radio Spectrum Sharing Systems with Random AccessS. Ekin, M. Abdallah, K. A. Qaraqe, and E. SerpedinIEEE Wireless Advanced (WIAD), London, UK, June 2012

2011

  1. On the Statistics of Sub-carrier Collisions for Cell-edge Users and Air Interface Capacity in OFDMA SystemsS. Ekin, S. Yarkan, K. A. Qaraqe, and E. SerpedinInternational Symposium on Signals, Circuits and Systems (ISSCS), Iasi, Romania, July 2011
  2. Ergodic Sum Capacity of Multiple-Access Cognitive Radio Spectrum Sharing Systems in Hyper Fading EnvironmentsS. Ekin, T. Agarwal, K. A. Qaraqe, and E. SerpedinInternational Symposium on Signals, Circuits and Systems (ISSCS), Iasi, Romania, July 2011

2009

  1. Achievable Capacity of a Spectrum Sharing System over Hyper Fading ChannelsS. Ekin, F. Yilmaz, H. Celebi, K. A. Qaraqe, M.-S. Alouini, and E. SerpedinIEEE Global Communications Conference (GLOBECOM), Honolulu, HI, Dec. 2009

2008

  1. RF-Based Location Determination in Heterogeneous Sensor Networks Using Rayleigh Fading ChannelS. Ekin, A. I. El-Osery, and W. Abd-AlmageedIEEE International Conference on Computer Communications (INFOCOM), 2nd Workshop on MCN, Phoenix, AZ, Apr. 2008

Books and book chapters

  1. Ultra-Wide Band Channel Measurements and Modelling for Unmanned Aerial Vehicle-to-Wearables (UAV2W) SystemsA. Kachroo*, S. Vishwakarma**, J. N. Dixon**, H. Abuella*, A. Popuri**, Q. H. Abbasi, C. F. Bunting, J. D. Jacob, and S. EkinAutonomous Airborne Wireless Networks, Wiley, 2021
  2. RF-Based Location Determination In Heterogeneous Sensor Networks: Localization In Wireless Sensor Networks Using Particle Filters Over Rayleigh Fading ChannelsS. Ekin and A. I. El-OseryVDM Verlag, Dec. 2009 (research monograph)

Patents and invention disclosures

Issued U.S. patents

  1. System and Method of Non-Contact Glucose SensingS. Ekin, D. Piao, and J. F. O'HaraU.S. Patent 11,796,466, Oct. 2023. Assignee: Oklahoma State University; status: active
  2. System and Method for Speed Estimation, Detection and Ranging Using Visible Light in VehiclesH. Abuella*, S. Ekin, and M. UysalU.S. Patent 10,768,194, Sept. 2020. Assignees: Oklahoma State University and Özyeğin University; status: active

Published patent applications

  1. Non-Invasive Multi-Target Blood Pressure Monitoring using Passive Beamforming mmWave FMCW RadarS. Ekin, M. F. Karim, and A. Tag*International (PCT) Patent Application Publication WO 2025/221680 A1 (Appl. PCT/US2025/024567), filed Apr. 2025. Assignee: Texas A&M University System; status: pending
  2. System and Method of Noncontact Vital Signs Monitoring Through Light SensingS. Ekin and H. Abuella*U.S. Patent Application Publication US 2019/0274547 A1 (Appl. 16/295,603), filed Mar. 2019. Assignee: Oklahoma State University; status: abandoned
  3. Adaptive Control Channel Detection in Wireless CommunicationsR. He, S. Ekin, V. B. Vijayakumar, P. Krishnamoorthy, T. Asthana, G. A. M. Mohammed, R. A. A. Attar, P. Kaivaram, and D. ChenU.S. Patent Application Publication US 2016/0119804 A1 (Appl. 14/526,273), filed Oct. 2014

Invention disclosures

  1. Structural Health Monitoring using Light-wave SensingS. Ekin and M. SolimanInvention disclosure submitted to OSU Patent Office, Aug. 2019
  2. A System for Indoor Occupancy Estimation using Visible Light Sensing (VLS)H. Abuella*, S. Ekin, and M. A. Mestiraihi**Invention disclosure submitted to OSU Patent Office, Feb. 2018
  3. Narrowband Internet of Things based Livestock Monitoring and Anomaly Detection AlgorithmsS. Ekin, J. Hu, and R. ReuterInvention disclosure submitted to OSU Patent Office, Apr. 2017

Other conference papers and technical reports

Not peer-reviewed

  1. A DRL-based Demand-Driven Elastic User-Centric RAN Optimization for 6G & BeyondS. K. Kasi, U. S. Hashmi, M. Nabeel, S. Ekin, and A. ImranRF 2022 Research Forum, University of Oklahoma, Tulsa, OK, 2022
  2. Improved surface reflectivity and dispersion using metal doped paints in terahertz bandR. Messenger**, K. Strecker*, J. F. O'Hara, and S. EkinNext-Generation Spectroscopic Technologies XIV, vol. 11725, p. 1172507, International Society for Optics and Photonics (virtual conference), 2021
  3. Deterministic and stochastic effects in broadband terahertz links affected by atmospheric temporal dispersionK. Strecker*, J. F. O'Hara, and S. EkinNext-Generation Spectroscopic Technologies XIV, vol. 11725, International Society for Optics and Photonics (virtual conference), 2021
  4. Correction of Channel Dispersion in Terahertz Wireless CommunicationsK. Strecker**, S. Ekin, and J. F. O'HaraSPIE Next-Generation Spectroscopic Technologies XIII, vol. 11390, p. 113900N, 2020
  5. Rx AGC Accumulator Timing Offset ImpactsS. Ekin, R. He, J. N. Paul, and S. ApteQualcomm Tech (Qtech), San Diego, CA, June 2014
  6. Power Activity Indicator Based Interference Control in UMTS HetNetsS. Celebi, N. K. Vinay, J. Luo, and S. EkinQualcomm Tech (Qtech), San Diego, CA, June 2013

Theses, posters, and other works

  1. Transforming AI Research and Education: Texas A&M's Generative AI Literacy InitiativeS. Ekin, N. Duffield, K. Narayanan, and D. CaseyPoster, Artificial Intelligence Research & Innovation Meeting, Texas A&M University System, Faculty AI Research Discovery Gallery (AI for Scientific Reasoning & Discovery), Oct. 5–6, 2026, College Station, TX
  2. Random Subcarrier Allocation in OFDMA-based Cognitive Radio Networks and Hyper Fading ChannelsS. EkinPh.D. dissertation, Electrical and Computer Engineering, Texas A&M University, Dec. 2012
  3. Capacity of Dynamic Fading Cognitive Radio Multiple-Access ChannelsS. EkinPoster, 2011 School of Information Theory, May 27–30, 2011, Univ. of Texas at Austin, Austin, TX
  4. Capacity of Cognitive Radio Systems over Hyper Fading ChannelsS. EkinPoster, 14th Annual Student Research Week, Texas A&M University, Mar. 2011Second Place Award (ECE)
  5. Solutions Manual for the Chapter on Majorization Theory with Applications in Signal Processing and Communication SystemsS. EkinMathematical Foundations for Signal Processing, Communications, and Networking, Chapter by J. Wang and D. P. Palomar; Eds. E. Serpedin, T. Chen, and D. Rajan, Cambridge University Press, 2011
  6. RF-Based Location Determination in Heterogeneous Sensor NetworksS. EkinM.Sc. thesis, Department of Electrical Engineering, New Mexico Institute of Mining and Technology, May 2008