203 citations · 601 across the 30 of their papers we have counts for
33 papers
Modeling Diffuse Scattering in Mobility Scenarios: Ray Tracing Model and Measurement Validation
Milica Djordjevic, Thomas Wilding, Anja Dakić +3
Open-source ray tracing (RT) frameworks are increasingly used for site-specific channel modeling due to their reproducibility and extensibility. In non-stationary mobility scenario…
Stochastic 3-D Foliage Modeling at 80 GHz: Experimental Validation and Ray-Tracing Simulations
Jiri Blumenstein, Radek Zavorka, Josef Vychodil +10
A stochastic modeling methodology for 3-D foliage is presented, aimed at enhancing ray-tracing simulations. The model supports adjustable stochastic geometry, density, and shape to…
Angularly-Resolved 3D Foliage Modeling and Measurements at 60 and 80 GHz: From Stochastic Geometry to Deterministic Channel Characterization
Jiri Blumenstein, Radek Zavorka, Josef Vychodil +10
In this paper, we show a stochastic approach to generate a 3D model of a foliage, which is then used for deterministic ray-tracing channel modeling. This approach is verified by a…
RIS Nearfield Position and Velocity Estimation Using a Validated Propagation Model
Thomas Zemen, Musa Furkan Keskin, Moustafa Rahal +5
We investigate reconfigurable intelligent surfaces (RISs) for the task of position and velocity estimation in non-LOS (NLOS) indoor scenarios, using a snapshot based multi-step est…
Time-Varying Rician K-factor in Measured Vehicular Channels at cmWave and mmWave Bands
Faruk Pasic, Markus Hofer, Thomas Zemen +2
Future vehicular communication systems will integrate millimeter wave (mmWave) technology to enhance data transmission rates. To investigate the propagation effects and small-scale…
Communication Technologies for Intelligent Transportation Systems: From Railways to UAVs and Beyond
Shrief Rizkalla, Adrian Kliks, Nila Bagheri +25
This white paper aims to comprehensively analyze and consolidate the state of the art in communication technologies supporting modern and future Information and Communication Techn…
Adaptive RIS Control for Mobile mmWave NLoS Communication Using Single-Bit Feedback
Hamed Radpour, Markus Hofer, Thomas Zemen
Reconfigurable intelligent surfaces (RISs) are emerging as key enablers of reliable industrial automation in the millimeter-wave (mmWave) band, particularly in environments with fr…
Double-Directional V2V Channel Measurement using ReRoMA at 60 GHz
Hussein Hammoud, Yuning Zhang, Zihang Cheng +9
The coordination of vehicles is a crucial element of autonomous driving, as it enhances the efficiency, convenience, and safety of road traffic. In order to fully exploit the capab…
Site-Specific Radio Channel Representation for 5G and 6G
Thomas Zemen, Jorge Gomez-Ponce, Aniruddha Chandra +9
A site-specific radio channel representation (SSCR) takes the surroundings of the communication system into account by considering the environment geometry, including buildings, ve…
Ray Tracing Algorithm for Reconfigurable Intelligent Surfaces
Sara Sandh, Hamed Radpour, Benjamin Rainer +2
Ray tracing accelerated with graphics processing units (GPUs) is an accurate and efficient simulation technique of wireless communication channels. In this paper, we extend a GPU-a…
Reconfigurable Intelligent Surface for Industrial Automation: mmWave Propagation Measurement, Simulation, and Control Algorithm Requirements
Hamed Radpour, Markus Hofer, David Loschenbrand +4
Reconfigurable intelligent surfaces (RISs) enable reliable low-latency millimeter wave (mmWave) communication links in cases of a blocked line-of-sight (LoS) between the base stati…
Methodologies for Future Vehicular Digital Twins
Danilo Radovic, Markus Hofer, Faruk Pasic +3
The role of wireless communications in various domains of intelligent transportation systems is significant; it is evident that dependable message exchange between nodes (cars, bik…
Channel Estimation for mmWave MIMO using sub-6 GHz Out-of-Band Information
Faruk Pasic, Markus Hofer, Mariam Mussbah +4
Future wireless multiple-input multiple-output (MIMO) communication systems will employ sub-6 GHz and millimeter wave (mmWave) frequency bands working cooperatively. Establishing a…
Active Reconfigurable Intelligent Surface for the Millimeter-Wave Frequency Band: Design and Measurement Results
Hamed Radpour, Markus Hofer, Lukas Walter Mayer +3
Reconfigurable intelligent surfaces (RISs) will play a key role to establish reliable low-latency millimeter wave (mmWave) communication links for indoor automation and control app…
Frame Error Rate Prediction for Non-Stationary Wireless Vehicular Communication Links
Anja Dakić, Benjamin Rainer, Markus Hofer +1
Wireless vehicular communication will increase the safety of road users. The reliability of vehicular communication links is of high importance as links with low reliability may di…
Stationarity Evaluation of High-mobility sub-6 GHz and mmWave non-WSSUS Channels
Danilo Radovic, Faruk Pasic, Markus Hofer +3
Analysis and modeling of wireless communication systems are dependent on the validity of the wide-sense stationarity uncorrelated scattering (WSSUS) assumption. However, in high-mo…
Towards Cell-Free Massive MIMO: A Measurement-Based Analysis
David Löschenbrand, Markus Hofer, Laura Bernadó +2
Cell-free widely distributed massive multiple-input multiple-output (MIMO) systems utilize radio units spread out over a large geographical area. The radio signal of a user equipme…
Multi-Node Vehicular Wireless Channels: Measurements, Large Vehicle Modelling, and Hardware-in-the-Loop Evaluation
Stefan Zelenbaba, Benjamin Rainer, Markus Hofer +4
Understanding multi-node vehicular wireless communication channels is crucial for future time-sensitive safety applications for human-piloted as well as partly autonomous vehicles…
Real-Time Vehicular Wireless System-Level Simulation
Anja Dakić, Markus Hofer, Benjamin Rainer +3
Future automation and control units for advanced driver assistance systems (ADAS) will exchange sensor and kinematic data with nearby vehicles using wireless communication links to…
Combating Massive MIMO Channel Aging by Orthogonal Precoding
Thomas Zemen, David Loeschenbrand
In this work we investigate ultra-reliable low-latency massive multiple-input multiple-output (MIMO) communication links in vehicular scenarios, where coherence between uplink and…
Sparsity in the Delay-Doppler Domain for Measured 60 GHz Vehicle-to-Infrastructure Communication Channels
Herbert Groll, Erich Zöchmann, Stefan Pratschner +9
We report results from millimeter wave vehicle-to-infrastructure (V2I) channel measurements conducted on Sept. 25, 2018 in an urban street environment, down-town Vienna, Austria. M…
Low-Complexity Equalization for Orthogonal Time and Frequency Signaling (OTFS)
Thomas Zemen, Markus Hofer, David Loeschenbrand
Recently, a new precoding technique called orthogonal time-frequency signaling (OTFS) has been proposed for time- and frequency-selective communication channels. OTFS precodes a da…
Iterative Detection for Orthogonal Precoding in Doubly Selective Channels
Thomas Zemen, Markus Hofer, David Loeschenbrand +1
Ultra-reliable wireless communication links require the utilization of all diversity sources of a wireless communication channel. Hadani et al. propose a two dimensional discrete s…
A time-variant channel prediction and feedback framework for interference alignment
Zhinan Xu, Markus Hofer, Thomas Zemen
In interference channels, channel state information (CSI) can be exploited to reduce the interference signal dimensions and thus achieve the optimal capacity scaling, i.e. degrees…