160 citations · 225 across the 41 of their papers we have counts for
43 papers
Minimizing Energy Consumption based on Waste Factor in Multi-user Multi-relay Systems
Nurullah Sevim, Mostafa Ibrahim, Sabit Ekin +1
The escalating energy demands of modern wireless networks make energy-efficient system design a central challenge for future 6G deployments. Relay-assisted communication has long b…
Integrated Sensing and Communications: A Tutorial on Mathematical Foundations, Signal Processing and System Design for 6G
Sabit Ekin
Integrated sensing and communications (ISAC) is a cornerstone of sixth-generation (6G) wireless networks: a single waveform, aperture, and hardware platform simultaneously conveys…
Quantifying the Reality Gap for RL-Based UAV Placement at mmWave and Sub-THz
Abdullateef Almohamad, Mostafa Ibrahim, Sabit Ekin +1
Reinforcement learning (RL) policies for unmanned aerial vehicle (UAV) placement in mmWave and sub-terahertz networks are typically trained on simplified analytical channels. We qu…
The Anatomy of RF Chains: Metrics, Measures, and Operating Efficiency
Leonid Belostotski, Arjuna Madanayake, John Nielsen +6
In 1958, Haus and Adler [1] introduced the concept of noise measure. Noise measure is a single quantitative metric that provides a comprehensive basis for comparing devices (indivi…
Bypassing the CSI Bottleneck: MARL-Driven Spatial Control for Reflector Arrays
Hieu Le, Oguz Bedir, Mostafa Ibrahim +2
Reconfigurable Intelligent Surfaces (RIS) are pivotal for next-generation smart radio environments, yet their practical deployment is severely bottlenecked by the intractable compu…
Learning to Focus: CSI-Free Hierarchical MARL for Reconfigurable Reflectors
Hieu Le, Mostafa Ibrahim, Oguz Bedir +2
Reconfigurable Intelligent Surfaces (RIS) have the potential to engineer smart radio environments for next-generation millimeter-wave (mmWave) networks. However, the prohibitive co…
Learning to Reflect: Hierarchical Multi-Agent Reinforcement Learning for CSI-Free mmWave Beam-Focusing
Hieu Le, Oguz Bedir, Mostafa Ibrahim +2
Reconfigurable Intelligent Surfaces promise to transform wireless environments, yet practical deployment is hindered by the prohibitive overhead of Channel State Information (CSI)…
Masked Symbol Modeling for Demodulation of Oversampled Baseband Communication Signals in Impulsive Noise-Dominated Channels
Oguz Bedir, Nurullah Sevim, Mostafa Ibrahim +1
Recent breakthroughs in natural language processing show that attention mechanism in Transformer networks, trained via masked-token prediction, enables models to capture the semant…
Theoretical Foundations of Waste Factor and Waste Figure with Applications to Fixed Wireless Access and Relay Systems
Nurullah Sevim, Mostafa Ibrahim, Sabit Ekin +1
The exponential rise in energy consumption across wireless communication systems, particularly in anticipation of next-generation wireless systems, necessitates rigorous frameworks…
Block Phase Tracking Reference Signal (PTRS) Allocation for DFT-s-OFDM
Mostafa Ibrahim, Sabit Ekin, Yingming +2
This study introduces a Block Phase Tracking Reference Signal (PTRS) allocation approach for Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFD…
Signal Whisperers: Enhancing Wireless Reception Using DRL-Guided Reflector Arrays
Hieu Le, Oguz Bedir, Mostafa Ibrahim +2
This paper presents a multi-agent reinforcement learning (MARL) approach for controlling adjustable metallic reflector arrays to enhance wireless signal reception in non-line-of-si…
Simulation-Based Optimistic Policy Iteration For Multi-Agent MDPs with Kullback-Leibler Control Cost
Khaled Nakhleh, Ceyhun Eksin, Sabit Ekin
This paper proposes an agent-based optimistic policy iteration (OPI) scheme for learning stationary optimal stochastic policies in multi-agent Markov Decision Processes (MDPs), in…
Propeller Modulation Equalization via Reference Tones
Mostafa Ibrahim, Sabit Ekin
Propeller modulation, also known as micro-Doppler modulation, presents a significant challenge in radio frequency (RF) inspection operations conducted via drones. This paper invest…
Guiding Wireless Signals with Arrays of Metallic Linear Fresnel Reflectors: A Low-cost, Frequency-versatile, and Practical Approach
Hieu Le, Oguz Bedir, Jian Tao +2
This study presents a novel mechanical metallic reflector array to guide wireless signals to the point of interest, thereby enhancing received signal quality. Comprised of numerous…
A Perspective on the Impact of Group Delay Dispersion in Future Terahertz Wireless Systems
Karl Strecker, Sabit Ekin, John F. O'Hara
This article discusses the challenges and opportunities of managing group delay dispersion (GDD) and its relation to the performance standards of future sixth-generation (6G) wirel…
Anticipating Optical Availability in Hybrid RF/FSO Links Using RF Beacons and Deep Learning
Mostafa Ibrahim, Arsalan Ahmad, Sabit Ekin +4
Radio frequency (RF) communications offer reliable but low data rates and energy-inefficient satellite links, while free-space optical (FSO) promises high bandwidth but struggles w…
Free-Space Optical Channel Turbulence Prediction: A Machine Learning Approach
Md Zobaer Islam, Ethan Abele, Fahim Ferdous Hossain +3
Channel turbulence is a formidable obstacle for free-space optical (FSO) communication. Anticipation of turbulence levels is highly important for mitigating disruptions but has not…
Large Language Models (LLMs) Assisted Wireless Network Deployment in Urban Settings
Nurullah Sevim, Mostafa Ibrahim, Sabit Ekin
The advent of Large Language Models (LLMs) has revolutionized language understanding and human-like text generation, drawing interest from many other fields with this question in m…
Positioning Error Impact Compensation through Data-Driven Optimization in User-Centric Networks
Waseem Raza, Fahd Ahmed Khan, Muhammad Umar Bin Farooq +2
The performance of user-centric ultra-dense networks (UCUDNs) hinges on the Service zone (Szone) radius, which is an elastic parameter that balances the area spectral efficiency (A…
Evolutionary Optimization of 1D-CNN for Non-contact Respiration Pattern Classification
Md Zobaer Islam, Sabit Ekin, John F. O'Hara +1
In this study, we present a deep learning-based approach for time-series respiration data classification. The dataset contains regular breathing patterns as well as various forms o…
Promoting Rural Entrepreneurship through Technology: A Case Study using Productivity Enhancing Technology Experience Kits (PETE-Kits)
Matthew W. Rutherford, Brian E. Whitacre, Levi Captain +4
Contribution: Case study of a rural-focused educational program with two components: 1) introducing high school students and teachers to Smart and Connected Technologies (SCTs) tha…
Respiratory Anomaly Detection using Reflected Infrared Light-wave Signals
Md Zobaer Islam, Brenden Martin, Carly Gotcher +3
In this study, we present a non-contact respiratory anomaly detection method using incoherent light-wave signals reflected from the chest of a mechanical robot that can breathe lik…
The Fundamental Limits of Light-Wave Sensing for Non-Contact Respiration Monitoring
Brenden Martin, Md Zobaer Islam, Carly Gotcher +3
An experimental testbed has been constructed to assess the capabilities of Light-Wave Sensing, a promising new vitals monitoring approach. A Light-Wave Sensing apparatus utilizes i…
Time-Frequency Warped Waveforms for Well-Contained Massive Machine Type Communications
Mostafa Ibrahim, Huseyin Arslan, Hakan Ali Cirpan +1
This paper proposes a novel time-frequency warped waveform for short symbols, massive machine-type communication (mMTC), and internet of things (IoT) applications. The waveform is…