Recent publications

August 2024

Dual-Polarized Sub-THz Channel Measurements in D-Band in an Industrial Environment

Alper Schultze, Wilhelm Keusgen, Michael Peter, Ramez Askar, Taro Eichler, Mathis Schmieder

In this paper, we introduce a novel time domain (TD) correlation based channel sounder that operates in the D-band (110 GHz to 170 GHz) with which we performed dual-polarized sub-THz channel measurements in an industrial environment.


August 2024

Localization in Dynamic Indoor MIMO-OFDM Wireless Systems using Domain Adaptation

Rafail Ismayilov, Slawomir Stanczak, Renato L. G. Cavalcante

Predicting user locations in dynamic indoor wireless environments is improved by using domain adaptation techniques. This approach effectively addresses challenges such as the birth, death, and drift of scattering clusters caused by environmental...


August 2024

W-Band Beamforming Front-End Implementation and Outdoor Trials for Mobile Backhaul and Access

Mathis Schmieder, Wilhelm Keusgen, Michael Peter, Mehrnoosh Mazhar Sarmadi, Alper Schultze, Dirk Schwantuschke

This paper presents the design and implementation of a novel analog beam former for the frequency range around 85 GHz. The capabilites are demonstrated through an outdoor trial in an urban environment, showcasing the potential of high frequency...


August 2024

When Only Time Will Tell: Interpreting How Transformers Process Local Ambiguities Through the Lens of Restart-Incrementality

Brielen Madureira, Patrick Kahardipraja, David Schlangen

A method to interpret how restart-incremental bidirectional models process local ambiguities, with an analysis on meaning representation and dependency parsing.


August 2024

32 GBd, 109 Gbit/s probabilistically shaped THz wireless transmission using PIN-PD based photonic upconversion

In-Ho Baek, Martin Schell, Colja Schubert, Ronald Freund, Robert Elschner, Simon Nellen, Robert Kohlhaas, Oliver Stiewe, Garrit William Johannes Schwanke

We characterize the performance of high symbol rate probabilistic constellation shaping (PCS) in a THz wireless link utilizing a PIN photodiode-assisted transmitter. Using a 64-QAM base constellation we demonstrate high data rate adaptivity,...


August 2024

Gradual Change Detection in Covariance Matrix: A Lazy Approach

Sida Dai, Lars Thiele, Slawomir Stanczak, Setareh Maghsudi, Ehsan Tohidi

The covariance matrix offers a balance between frequent channel estimations and maintaining acceptable system performance. In this work, we propose an intelligent autonomous mechanism that monitors changes in the covariance matrix, minimizing...


August 2024

Sub-THz D-Band Integrated Analog Beamforming Front-End Prototyping and 6G Outdoor 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

This paper reports the development outcomes of the world’s first integrated analog beamforming – transmit and receive – wireless front-ends operating in the D-band (a sub- THz band), particularly designed to operate within 150 GHz to 170 GHz...


August 2024

Two-timescale weighted sum-rate maximization for large cellular and cell-free massive MIMO

Lorenzo Miretti, Slawomir Stanczak, Emil Björnson

Discover a groundbreaking two-timescale method for optimizing the weighted sum-rate in future multi-antenna wireless systems. Our innovative approach overcomes the severe scalability issues of traditional methods, namely the extreme computational...


August 2024

User-Centric Monostatic Sensing Aided by Reconfigurable Intelligent Surfaces

Abdolvakil Fazli, Slawomir Stanczak, Zoran Utkovski, Ehsan Tohidi

We propose that deploying Reflecting Intelligent Surfaces (RIS) as auxiliary sensors can either enable (in cases of blockage) or assist UEs in improving sensing performance. This can be achieved by deploying larger surfaces, offering superior...


August 2024

Load Balancing in O-RAN

Hammad Zafar, Slawomir Stanczak, Martin Kasparick, Ehsan Tohidi

Efficiently managing network load has long been a challenge in wireless networks, and open radio access networks (O-RAN) can offer a potential solution through open interfaces and optimization capabilities. This paper focuses on addressing the...


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