Recent publications

August 2025

An Open Source Digital Twin Framework for O-RAN

Hammad Zafar, Slawomir Stanczak, Martin Kasparick, Ehsan Tohidi

This paper introduces a digital twin framework for O-RAN, designed to support the development and testing of xApps. By leveraging real-time data analysis and simulation, digital twins facilitate network performance optimization and enable a...


August 2025

Spatially Resolved Rainfall Streamflow Modeling in Central Europe

Marc Vischer, Jackie Ma, Noelia Otero Felipe

Climate change increases the risk of disastrous floods and makes intelligent fresh water management an ever more important issue for society. A central prerequisite is the ability to accurately predict the water level in rivers from a range of...


August 2025

Deep Learning-Based Postprocessing to Enhance Subseasonal Soil Moisture Forecasts Over Europe

Noelia Otero Felipe, Jackie Ma, Atahan Özer

Accurate forecasts on subseasonal (S2S) timescales are essential for the preparation andmitigation of the impacts of high?impact events, such as flash droughts. To improve the accuracy of soilmoisture forecasts—a critical factor in identifying...


August 2025

On Level Crossings and Fade Durations in von Mises-Fisher Scattering Channels

Kenan Turbic, Slawomir Stanczak, Martin Kasparick

The paper presents closed-form analytical expressions for the level-crossing rate (LCR) and average fade duration (AFD) in channels with von Mises–Fisher (vMF) scattering. This work complements our previous results on correlation functions and...


August 2025

Quantification of Degradation Processes in Lithium-Ion Batteries Through Internal Strain Measurement with Fiber Bragg Grating Sensors

Leonard Kropkowski, Wolfgang Schade, Antonio Nedjalkov, Tim Oestreich, Fangqi Li, Alexandra Burger, Andreas Würsig

This study explores the use of fiber optical sensors with Bragg gratings to monitor internal strain in lithium-ion battery anodes, offering new insights into aging and degradation. By combining optical measurements with traditional methods, it...


July 2025

Demonstration of a Programmable Node Prototype for Spatial Lane Switching and Band Switching

Abdelrahmane Moawad, R. Morro, Colja Schubert, Robert Emmerich, Johannes K. Fischer, Mohammad Behnam Shariati, A. Giorgetti, Caio Marciano Santos, Hussein Zaid

In this work, we designed a passive 2×2 MBoSDM node prototype that is capable of band and space/fiber switching. The prototype is fully controllable though an SDN agent and supports selective band switching as well as add/drop functions for the...


June 2025

Datasets for QoT estimation in SDM networks

Hassan Akbari, R. Freund, Johannes K. Fischer, Mohammad Behnam Shariati, Pooyan Safari, Juan L. Morrone

The advancement of machine learning (ML)-assisted solutions for monitoring and performance analysis in space-division multiplexing (SDM) networks has been significantly constrained by a shortage of large, well-structured, and publicly available...


June 2025

Angle-Resolved Channel Measurements at 28 and 160 GHz in Open Office Industrial-Like Environment

Mathis Schmieder, Wilhelm Keusgen, Michael Peter, Ramez Askar, Alper Schultze, Niclas Woodstock Kullig

This paper investigates angle-resolved channel measurements at 28 and 160 GHz within an industrial-like open office environment. It presents findings on power metrics, delay, and angular characteristics based on 135 measurement positions. Results...


June 2025

N-Heterocyclic Olefins of Pyrazole and Indazole

Bloin Zhu, Eike Hübner, Felix Lederle, Andreas Schmidt, Rouven Woyciechowski

Deprotonation of 3-methylpyrazolium and 3-methylindazolium salts yielded N-heterocyclic olefins (NHOs), which reacted with isocyanates, halogens, and carbon disulfide. Calculated proton affinities are 261 kcal/mol (indazole NHOs) and 272 kcal/mol...


June 2025

140 GBd S-C-L-Band Transmission System Enabled by TFLN Coherent Driver Modulator and InP Coherent Receiver Engine

Robert Emmerich, Patrick Runge, Martin Schell, Colja Schubert, Ronald Freund, Alexander Schindler

We demonstrate high symbol rate (128/140-Gbaud QPSK/16QAM) transmission for multi-band systems (S-C-L-band) with commercially available components. The broadband thin film lithium niobate high-bandwidth modulator and the HHI designed InP coherent...


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