Aktuelle Publikationen

Juni 2026

Cellular, Cell-less, and Everything in Between: A Unified Framework for Utility Region Analysis in Wireless Networks

Renato L. G. Cavalcante, Slawomir Stanczak, Tomasz Piotrowski

This study connects the geometry of network utility regions -- such as SINR and achievable rates -- to the concept of nonlinear spectral radius. In doing so, it reveals when scheduling offers no extra gains and identifies regimes in which...


Juni 2026

Linewidth Narrowing of InP-Based Lasers by Self-Injection Locking With a Monolithically Integrated Ring Resonator

Hendrik Boerma, Patrick Runge, Martin Schell, Sarah Cwalina, Arbnor Berisha, Mikhal Camjalli

A new monolithically integrated self-injection locking scheme, based on a ring resonator and a reflector, is demonstrated for InP lasers. We analyze and compare three different configurations, focusing particularly on the Lorentzian linewidth: an...


Juni 2026

Deep Unfolded Superiorized POCs for Robust Joint Transmission under Phase Misalignment

Maximilian Klemm, Slawomir Stanczak, Jochen Fink, Ezer Melzer, Doron Ezri

DU-S-POCS achieves robust joint transmission in Wi-Fi networks despite phase misalignment between access points. By explicitly accounting for noise variance and combining superiorization with deep unfolding, it demonstrates consistent spectral...


Juni 2026

Visualisation of Real-Time Environmental Data with Augmented Reality

Sylvain Renault, Oliver Schreer, Ingo Feldmann, Lieven Raes, Jurgen Silence

This paper introduces a framework, a visualisation concept, and a prototype AR application designed to overlay environmental information, such as air quality and traffic data, onto the user’s view. The software framework is capable of easily...


Juni 2026

6G upper mid-band independently controllable dual-polarized reconfigurable intelligent surface (RIS)

Mehmet Ahad Yurtoglu, Michael Peter, Ramez Askar, Mathis Schmieder, Sven Wittig

A dual-polarized RIS unit cell for the 6G upper mid-band is presented and experimentally validated using a 3x3 prototype. The proposed design enables independent control of orthogonal polarizations while maintaining high isolation, demonstrating...


Juni 2026

Scaling Optical Testbed Data Space for Data Sharing Across Vendor and Organizational Boundaries

A. Mitrovska, A. Autenrieth, Y. Yoshida, T. Suzuki, R. Freund, Y. Hirota, V. Karunakaran, A. Raj, S. Xu, A. Jafari, N. Dsilva, B. Shariati, M. Ruffini, P. Safari, J.K. Fischer, Y. Awaji, T. Bauschert

We demonstrate a data-sharing platform enabling on-demand sovereign data exchange across optical testbeds and system vendors to support ML development and predictive maintenance, through advanced vendor-, anonymization-, and purpose-based...


Juni 2026

End-to-End GSNR Estimation While Securing Vendors’ Trade Secrets and Operators’ Confidentiality

Angela Mitrovska, Ronald Freund, Johannes K. Fischer, Mohammad Behnam Shariati, Pooyan Safari, Hamze Ghorbani Koujani

We propose a Secure Multi-Party Computation protocol for GSNR estimation in disaggregated networks without exposing per-domain values, including back-to-back TRx characteristics, while demonstrating accuracy comparable to GNPy and analytical...


Juni 2026

Demonstration of Customer-Owned and Carrier-Controlled Coherent Pluggables using Ownership-Aware YANG Models

Angela Mitrovska, Ronald Freund, Johannes Fischer, Mohammad Behnam Shariati, Pooyan Safari, Hussein Zaid

We demonstrate a governed control framework that validates NETCONF operations against customer-defined policies using augmented YANG models and dataspace connectors, enabling carrier control of customer-owned coherent pluggables within a live...


Mai 2026

Experimental Demonstration of Neural-Network Based Transceiver Nonlinearity Mitigation for Probabilistically Shaped Photonic THz Wireless Transmission

In-Ho Baek, Colja Schubert, Ronald Freund, Robert Elschner, Marie-Catherine Bittiehn, Julian Honecker

To mitigate front-end nonlinearities in probabilistically shaped photonic terahertz links, we experimentally demonstrate a NAS-optimized CNN–BiLSTM nonlinear equalizer trained with an entropy-regularized loss function. Across lens- and...


Mai 2026

Distributed Intelligence Framework with Privacy-Preserving Features for FTTR Network Monitoring and Automation

Massimiliano Sica, Ronald Freund, Johannes Fischer, Mohammad Behnam Shariati, Mihail Balanici, Massimiliano Sica, Muhammad Rehan Raza

This work demonstrates a novel distributed intelligence framework for fiber-to-the-room networks, designed to collect telemetry data locally and utilize them for autonomous network reconfiguration and management, while ensuring data...


Mai 2026

An Age of Information Characterization of SPS

Maria Bezmenov, Slawomir Stanczak, Matthias Frey, Zoran Utkovski

How fresh is your data, really? This work goes beyond average performance metrics to fully characterize how old information gets in vehicular networks — revealing a surprising twist: what minimizes average staleness may actually worsen the risk...


Mai 2026

Detection, identification, and localization of faults in PONs using joint OLT and OTDR telemetry data

Massimiliano Sica, Ronald Freund, Johannes Fischer, Mohammad Behnam Shariati, Pooyan Safari, Sai Patri, Vishal Rai, Joseph John

Passive optical networks (PONs) are essential for broadband access across residential, enterprise, and industrial environments, where fast and reliable fault management is increasingly critical. Fiber faults, such as tapping, cutting, or issues...


April 2026

Uplink Multi-User MIMO Testbed Implementation in OpenAirInterface

Utku Uçak, Matthias Mehlhose, Slawomir Stanczak, Renato L. G. Cavalcante, Jochen Fink, Daniel Schäufele, Fariba Armandoust

This paper presents our results on building an Uplilnk Multi-User Multiple Input Multiple Output (MU-MIMO) testbed using OpenAirInteface and software-defined radios (SDRs). We overview the theory and detail the firmware implementation, hardware...


April 2026

Performance Analysis of Cell-Free Massive MIMO under Imperfect LoS Phase Tracking

Noor Ul Ain, Slawomir Stanczak, Renato L. G. Cavalcante, Lorenzo Miretti

A unified Rician fading model and MMSE-optimal framework for performance analysis of distributed massive MIMO that bridges the gap between idealized assumptions and practical tracking limitations in cell-free networks.


April 2026

Pt–Re dehydrogenation catalysts synthesized via solvent deficient precipitation

Ana de Oliveira, Eike Hübner, Felix Lederle, Philipp Memmel, Peter Wasserscheid, Moritz Wolf, Franziska Auer

This study demonstrates the feasibility of producing Pt–Re/Al2O3 catalysts via the scalable solvent deficient precipitation method achieving enhanced performance in the dehydrogenation of liquid organic hydrogen carriers. Successful 10-fold...


April 2026

A consolidated and accessible security proof for finite-size decoy-state quantum key distribution

Jerome Wiesemann, Jan Krause, Nino Walenta, Davide Rusca, Devashish Tupkary, Norbert Lütkenhaus

In recent years, quantum key distribution (QKD) has evolved from a scientific research field to a commercially available security solution, supported by mathematically formulated security proofs. However, since the knowledge required for a full...


April 2026

Deterministic Ray-Launching Tool for THz Propagation Modeling

Arslan Arif, Alper Schultze, Mikel Celaya-Echarri, Francisco Falcone, Fidel A. Rodríguez-Corbo, Miguel Navarro-Cía, Leyre Azpilicueta

In this paper, we introduce a deterministic ray-launching (RL) tool for THz propagation modeling. The tool includes a library of electromagnetic material properties, obtained from measurements of common building materials and uses geometric and...


März 2026

AI/ML-Driven 6G Network Solutions with Energy Efficiency Considerations

Andreas Roessler, Slawomir Stanczak, Aydin Sezgin, Dirk Wübben, Armin Dekorsy, Gerhard Fettweis, Rick Fritschek, Carsten Bockelmann, Jochen Fink, Rouaa Diab, PRAMESH GAUTAM, SACHINKUMAR B. MALLIKARJUN, MUHAMMAD QURRATULAIN KHAN, MOHAMMAD PARVINI, ALI EL HUSSEINI, Marco Danger, RAFAEL F. SCHAEFER, Alireza Danaee, Miguel M.Lopez, Ali Abdi, Christian Arendt, Ahmad Nimr, Erma Perenda, Robert-Jeron Reifert, Christian Wietfeld

This paper covers some AI/ML-related topics for 6G within’ the context of 6G-ANNA project. It brings together partners from industry and academia, highlighting the role of AI/ML in 6G from both standardization and aca! demia point of view. It...


März 2026

3D-printed dual-polarized magneto-electric dipole antenna with > 50-dB wideband isolation for full-duplex and ICAS applications

Mehmet Ahad Yurtoglu, Michael Peter, Ramez Askar, Laura Alice Leather

A 3D-printed, wideband, dual-polarized magneto-electric dipole (MED) antenna achieving over 50 dB cross-polarization isolation across 3.05–4.13 GHz is designed. The design enables cost-effective fabrication, stable radiation performance, and...


März 2026

Challenges and Advances of SDM-PON

Ziyan Ma, Volker Jungnickel, Kai Habel, Ronald Freund, Christoph Kottke, Andre Richter, Nikolay Ledentsov, Sarah Cwalina, Tobias Tiess, V. Shchukin, Vladislav Neskorniuk, Igor Koltchanov, Artur Chaikovski, Michael Straub, André Klauss

This paper presents the advances and challenges in the design, integration, and performance evaluation of an SDM-PON system based on newly developed 7-core weakly coupled MCF. It highlights the system architecture, including MCF design,...


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