Aktuelle Publikationen

März 2025

Diamond-on-chip magnetic field camera for mobile imaging

Julian M. Bopp, Norbert Keil, Hauke Conradi, Felipe Perona, Jonas Wollenberg, Thomas Filsgen, Armin Liero, Heike Christopher

In this work, we introduce concepts for spatially resolved magnetic field sensing and two-dimensional gradiometry with an integrated magnetic field camera. The camera utilizes infrared absorption optically detected magnetic resonance (IRA ODMR)...


März 2025

RIS-Assisted 6G Networks: Challenges and Tradeoffs in Control Standardization

Ehsan Tohidi, Slawomir Stanczak, Stefan Schmid, Admela Jukan, Max Franke, André Drummond

Despite extensive theoretical progress in reconfigurable intelligent surfaces (RISs), practical models and network-level studies remain limited. This paper bridges the gap, exploring RIS-assisted links, proposing a control plane approach, and...


März 2025

High-quality deepfakes have a heart!

Clemens Peter Seibold, Peter Eisert, Anna Hilsmann, Eric Wisotzky, Benjamin Kossack, Arian Beckmann

Recent deepfakes preserve subtle heart rate signals, challenging the assumption that rPPG-based detection remains effective. Our study demonstrates that modern deepfake generation techniques encapsulate the heart rate dynamics of source videos,...


März 2025

Analysis of Interaction Mechanisms and Intercomparison of Raytracing Tools for Optimizing THz Simulations

Enes Aksoy, Leszek Raschkowski, Alper Schultze, Mikel Celaya-Echarri, Leyre Azpilicueta, Abdolvakil Fazli

This paper compares different raytracing tools in the sub-THz area, to analyze the weight of several different effects, e.g. reflections, diffractions, scattering or atmospheric attenuation, during raytracing simulations for high frequencies. For...


Februar 2025

LiFi for Industry 4.0: Main Features, Implementation and Initial Testing of IEEE Std 802.15.13

Kai Lennert Bober, Volker Jungnickel, Ronald Freund, Falko Dressler, Anselm Ebmeyer

The recently approved IEEE standard 802.15.13 defines a deterministic medium access scheme with dynamically allocated time slices and two ways of coding and modulation for industrial light communication. We present our work on prototyping the...


Februar 2025

Multi-Gbit/s LiFi Experiments with a VCSEL TX and an Enhanced Pulsed Modulation PHY

Malte Hinrichs, Volker Jungnickel, Ronald Freund, Dominic Schulz, Giulio Boniello

Enhancing an OOK-based PHY for LiFi, we show that the large bandwidth, high power, and low energy consumption of low-cost VCSEL arrays combined with SFP drivers can be utilized to reach Multi-Gbit/s data rates and enable user mobility in large...


Januar 2025

On the Optimal Performance of Distributed Cell-Free Massive MIMO with LoS Propagation

Noor Ul Ain, Slawomir Stanczak, Lorenzo Miretti

We investigate the capability of team MMSE technique in enhancing distributed beamforming for dense user-centric cell free massive MIMO networks. Considering the anticipated ultra-dense nature of cell-free massive MIMO networks and the...


Januar 2025

Doppler Power Spectrum in Channels with von Mises-Fisher Distribution of Scatterers

Kenan Turbic, Slawomir Stanczak, Martin Kasparick

This paper presents a closed-form expression for Doppler spectrum in mobile wireless channels with von Mises-Fisher (vMF) angular distribution of scatters. The obtained result is employed to analyze the impact of the vMF scattering parameters...


Januar 2025

Semantic Security with Infinite-Dimensional Quantum Eavesdropping Channel

Matthias Frey, Slawomir Stanczak, Igor Bjelakovic, Janis Nötzel

We investigate the semantic security of classical and quantum communication channels in the presence of infinite-dimensional side channels. A new method for security proofs is developed, which allows to derive finite block-length results in the...


Dezember 2024

Joint Waveform Design for Communication and Sensing with Adjustable PAPR

Berkan Kilic, Slawomir Stanczak, Martin Kasparick, Kenan Turbic

This paper proposes a dual-functional waveform design for integrated sensing and communication systems under adjustable peak-to-average-power-ratio constraints.


Dezember 2024

Towards Infrastructure-assisted WiFi Rate Adaptation for Converged Networks with Morpheus

Prashiddha Dhoj Thapa, Julius Schulz-Zander, Arne Kappen

The paper discusses a novel framework to integrate heterogeneous Radio Access Technologies (RATs) with the 5G O-RAN for coordination and joint optimization. As an example, it lays out the architecture of a WiFi Radio Intelligent Controller (RIC)...


Dezember 2024

Lossless Decoupling Networks for RF Self-Interference Cancellation in MIMO Full-Duplex Transceivers

Ramez Askar, Wilhelm Keusgen

The article presents a novel self-interference cancellation (SIC) technique using a lossless decoupling network in the RF domain for dedicated transmit-receive antennas. It includes antenna coupling analysis, SISO and 2×2 MIMO tests, and a...


Dezember 2024

Mobilizing the Terahertz Beam: D-Band Analog-Beamforming Front-End Prototyping and Long-Range 6G Trials

Ramez Askar, Thomas Haustein, Slawomir Stanczak, Wilhelm Keusgen, Michael Peter, Mathis Schmieder, Thomas Merkle, Jaehoon Chung, Sven Wittig, Laurenz John, Yonghak Suh, Jongpil Lee, Benjamin Baumann

This article presents a novel D-band (150-175 GHz) wireless transceiver, achieving 48 dBm EIRP with eight RF beams via a Rotman lens, outperforming prior versions. Developed with InGaAs MMIC technology, it enabled 6G trials, including a 9-meter...


Dezember 2024

Correlation Properties in Channels With von Mises-Fisher Distribution of Scatterers

Kenan Turbic, Slawomir Stanczak, Martin Kasparick

The von Mises-Fisher (vMF) scattering model is widely recognized for characterizing angular power distributions in MIMO systems and demonstrates versatility in modeling both communication and radar channels. This paper introduces exact and simple...


Dezember 2024

Towards Application Level Energy Monitoring for Green 6G Networks

Abishek Dandekar, Julius Schulz-Zander, Johannes Wegener, Ashrafur Rahman

We present a method to monitor network side energy consumption by an application running on the UE by fusing energy monitoring data with in band network telemetry.


November 2024

Gaussian Splatting Decoder for 3D-aware Generative Adversarial Networks

Florian Tim Barthel, Peter Eisert, Anna Hilsmann, Wieland Morgenstern, Arian Beckmann

We present a novel approach that combines the high rendering quality of NeRF-based 3D-aware GANs with the flexibility and computational advantages of 3DGS. By training a decoder that maps implicit NeRF representations to explicit 3D Gaussian...


November 2024

Experimental Characterization of a WR3-Coupled Photodiode Transmitter for High-Speed Terahertz Wireless Communication

In-Ho Baek, Patrick Runge, Martin Schell, Felix Ganzer, Colja Schubert, Ronald Freund, Robert Elschner, Oliver Stiewe, Alexander Schindler, Jonas Gläsel, Metin Furkan Ulukan, Trung T. Tran

We analyze the system performance of a large bandwidth photonic THz transmitter based on a WR3 coupled photodiode. Employing probabilistic constellation shaping (PCS) alongside a 64-QAM base constellation, we achieve net data rates of up to 76.8...


November 2024

Real-time Experiments towards an Automotive OFDMA Communication Bus

Matthias Koepp, Volker Jungnickel, Kai Habel

We present a new automotive bus system which allows enhanced channel adaptation and fine-granular multi-user access based on OFDMA. We highlight advantages of OFDMA in automotive applications, sketch the concept and present an FPGA prototype.


November 2024

Quanda: An Interpretability Toolkit for Training Data Attribution Evaluation and Beyond

Dilyara Bareeva, Thomas Wiegand, Wojciech Samek, Sebastian Lapuschkin, Anna Hedström, Galip Ümit Yolcu, Niklas Schmolenski

In recent years, training data attribution (TDA) methods have emerged as a promising direction for the interpretability of neural networks. While research around TDA is thriving, limited effort has been dedicated to the evaluation of...


November 2024

Multi-Resolution Generative Modeling of Human Motion from Limited Data

David Moreno-Villamarin, Peter Eisert, Anna Hilsmann

We present a generative model that learns to synthesize human motion from limited training sequences. Our framework provides conditional generation and blending across multiple temporal resolutions. moOurdel adeptly captures human motion patterns...


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