Aktuelle Publikationen

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...

This paper introduces ambient assistance for ICU environments. A user study shows that it enables room monitoring, supports examinations, and offers a proxemics-aware interface in an usable manner.

Important applications in Massive MIMO needs accurate angular power spectrum (APS) estimates, but covariance errors and changing channels make that difficult. This study presents an adaptive multikernel approach that models the APS as a sum of...

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...

This paper addresses long-term joint power control, beamforming and scheduling in overloaded cell-free MIMO systems, where the number of users exceeds the spatial degrees of freedom, to increase the minimum user rate and provide some power...

This work presents a complete 16x16 dual-polarized RIS platform for the 6G upper mid-band, covering unit-cell design, full-wave simulation, prototype fabrication, control-board implementation, and experimental characterization. The measured...

Can we improve the performance of next generation massive MIMO systems by merging channel estimation and beamforming, perhaps with the help of AI methods? This paper provides precise mathematical guidelines that help identiying practical regimes...

We present a comprehensive experimental and numerical investigation of integrated sensing and communication systems for coherent passive optical networks, wherein distributed acoustic sensing probes are digitally multiplexed in downstream...

Progress in monitoring and performance analysis in quantum key distribution (QKD) networks has been influenced by the limited availability of well-structured and publicly accessible datasets. As a result, this limitation forces researchers to...

We demonstrate autonomous self-healing in an IPoWDM network testbed comprising commercial equipment and MBoSDM prototype. We measured service provisioning time of under one minute and healing time of under 30 seconds in the considered usecase.

A complete digital twin-assisted lightpath operation workflow for multiband optical networks is proposed for assured performance and reliable surveillance. Accurate performance estimation and prompt degradation detection through continuous model...

We propose a hybrid digital twin using GNPy with ML-assisted EDFA models for accurate QoT estimation. The models achieve sub-0.1dB gain error, enhancing data ef ficiency and improving end-to-end lightpath signal-to-noise ratio estimation within...

Can full-duplex radios cancel their own transmissions fast enough for real-world use? This work develops a multi-kernel adaptive canceller that tracks nonlinear self-interference under changing conditions and demonstrates more than 50 dB...

In ISAC systems, the type of information exchange is important. Future ISAC systems require efficient information exchange when sensing is split between the user device (UE) and the base station (BS). We propose AI and non-AI frameworks for...

Abstract Face perception dynamically unfolds in three-dimensional space, yet, experimental paradigms predominantly rely on static 2D images, limiting insights into real-world face processing. We conducted a pre-registered study comparing face...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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.

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...