Gerhard Fettweis
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View article: Energy Efficiency vs Spectral Efficiency Tradeoff in Multi-user MIMO-OFDM Systems with Hardware Nonlinearities
Energy Efficiency vs Spectral Efficiency Tradeoff in Multi-user MIMO-OFDM Systems with Hardware Nonlinearities Open
Energy efficiency (EE) is a fundamental design criterion in multi-user multipleinput multiple-output (MU-MIMO) systems. Accurate evaluation of EE requires a comprehensive end-to-end (E2E) model that accounts for practical hardware impairme…
View article: Low-Complexity MIMO Detection in 5G IoT: The Box Decoding Approach
Low-Complexity MIMO Detection in 5G IoT: The Box Decoding Approach Open
The selection of an algorithm for MIMO detection often involves a trade-off between detection performance and the efficiency of the implementation. Tree-based algorithms, such as Sphere Decoding (SD), offer superior performance compared to…
View article: A Practical Analysis: Understanding Phase Noise Modelling in Time and Frequency Domain for Phase-Locked Loops
A Practical Analysis: Understanding Phase Noise Modelling in Time and Frequency Domain for Phase-Locked Loops Open
In MIMO systems, the presence of phase noise is a significant factor that can degrade performance. For MIMO testbeds build from SDR devices, phase noise cannot be ignored, particular in applications that require phase synchronization. This…
View article: Security, Privacy, and Resilience Controls for the 6G End-to-End System Developed in Hexa-X-II
Security, Privacy, and Resilience Controls for the 6G End-to-End System Developed in Hexa-X-II Open
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View article: Semantic Communication: From Philosophical Conceptions Towards a Mathematical Framework
Semantic Communication: From Philosophical Conceptions Towards a Mathematical Framework Open
Semantic communication has emerged as a promising paradigm to address the challenges of next-generation communication networks. While some progress has been made in its conceptualization, fundamental questions remain unresolved. In this pa…
View article: From mMIMO to xMIMO: A Unified Design for Spatial Wideband Effect Mitigation
From mMIMO to xMIMO: A Unified Design for Spatial Wideband Effect Mitigation Open
View article: The Role of Oscillator Phase Noise in Maximizing Transceiver Energy Efficiency
The Role of Oscillator Phase Noise in Maximizing Transceiver Energy Efficiency Open
Energy efficiency is a critical challenge for nextgeneration mobile networks. Especially as traffic demand grows, the energy per bit must decrease significantly. One promising solution is the Gearbox-PHY, which adaptively switches between …
View article: Beam Squint Reduction by Combining Phased Subarrays With True Time Delays in Baseband
Beam Squint Reduction by Combining Phased Subarrays With True Time Delays in Baseband Open
View article: A Tutorial on Wideband XL-MIMO: Challenges, Opportunities, and Future Trends
A Tutorial on Wideband XL-MIMO: Challenges, Opportunities, and Future Trends Open
As identified by international telecommunication union (ITU), extremely large-scale multiple-input multiple-output (XL-MIMO) is one of the pivotal enablers for sixth generation (6G) mobile communication networks across mmWave, sub-THz, and…
View article: Toward AI in 6G: Concepts, Techniques, and Standards
Toward AI in 6G: Concepts, Techniques, and Standards Open
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View article: Towards Robust Space- and Frequency-Domain Cooperative Distributed-Large MIMO Systems
Towards Robust Space- and Frequency-Domain Cooperative Distributed-Large MIMO Systems Open
View article: Cross-Layer Integrated Sensing and Communication: A Joint Industrial and Academic Perspective
Cross-Layer Integrated Sensing and Communication: A Joint Industrial and Academic Perspective Open
Integrated sensing and communication (ISAC) enables radio systems to simultaneously sense and communicate with their environment. This paper, developed within the Hexa-X-II project funded by the European Union, presents a comprehensive cro…
View article: Multi-Task Learning for mmWave Transceiver Beam Prediction
Multi-Task Learning for mmWave Transceiver Beam Prediction Open
Rigorous and reliable alignment of narrow transceiver beams is a requisite for ensuring the highly directional transmission in millimeter-wave (mmWave) communications. Exhaustively testing these narrow beam pairs results in increased refer…
View article: Sub-THz Communications: Perspective and Results From the Hexa-X-II Project
Sub-THz Communications: Perspective and Results From the Hexa-X-II Project Open
Sub-THz communications are envisioned to unlock ultra-high data rates, ultra-low latencies, and massive connectivity in future wireless systems by utilizing bandwidths of up to tens of GHz. This paper presents the holistic perspective on s…
View article: Enhancing Liver Steatosis Classification: H-Scan Analysis of Handheld Ultrasound Data
Enhancing Liver Steatosis Classification: H-Scan Analysis of Handheld Ultrasound Data Open
View article: Key Exchange in the Quantum Era: Evaluating a Hybrid System of Public-Key Cryptography and Physical-Layer Security
Key Exchange in the Quantum Era: Evaluating a Hybrid System of Public-Key Cryptography and Physical-Layer Security Open
Today's information society relies on cryptography to achieve security goals such as confidentiality, integrity, authentication, and non-repudiation for digital communications. Here, public-key cryptosystems play a pivotal role to share en…
View article: The Causal Nexus Between Different Feed Networks and Defected Ground Structures in Multi-Port MIMO Antennas
The Causal Nexus Between Different Feed Networks and Defected Ground Structures in Multi-Port MIMO Antennas Open
Multiple input multiple output (MIMO) antennas have recently received attention for improving wireless communication data rates in rich scattering environments. Despite this, the challenge of isolation persists prominently in compact MIMO-…
View article: Noise Analysis of a 434-MHz Wakeup Receiver Analog Frontend Core With −93-dBm Input Sensitivity and 65-pJ/Bit Efficiency Based on a Switched Injection-Triggered Oscillator With Surface Acoustic Wave Resonator
Noise Analysis of a 434-MHz Wakeup Receiver Analog Frontend Core With −93-dBm Input Sensitivity and 65-pJ/Bit Efficiency Based on a Switched Injection-Triggered Oscillator With Surface Acoustic Wave Resonator Open
View article: Advancing Spectrum Anomaly Detection through Digital Twins
Advancing Spectrum Anomaly Detection through Digital Twins Open
6th generation (6G) cellular networks are expected to enable various safety-critical use cases, for example, in the industrial domain, which require flawless operation of the network. Thus, resilience is one of the key requirements for 6G.…
View article: Conflict Management in Vector Register Files
Conflict Management in Vector Register Files Open
The instruction set architecture of vector processors operates on vectors stored in the vector register file which needs to handle several concurrent accesses by functional units with multiple ports. When the vector processor is running wi…
View article: Flexible Transceiver Platform for Holistic Radio Design Analysis
Flexible Transceiver Platform for Holistic Radio Design Analysis Open
View article: Advancing Spectrum Anomaly Detection through Digital Twins
Advancing Spectrum Anomaly Detection through Digital Twins Open
View article: Optimal routing and end-to-end entanglement distribution in quantum networks
Optimal routing and end-to-end entanglement distribution in quantum networks Open
View article: Conceptualizing Trustworthiness and Trust in Communications
Conceptualizing Trustworthiness and Trust in Communications Open
Trustworthiness and trust are basic factors in common societies that allow us to interact and enjoy being in crowds without fear. As robotic devices start percolating into our daily lives they must behave as fully trustworthy objects, such…
View article: Efficient Handover Mode Synchronization for NR-REDCAP on a Vector DSP
Efficient Handover Mode Synchronization for NR-REDCAP on a Vector DSP Open
To enable the low-cost design of 5 G IoT Standard reduced capability (NR-REDCAP) devices, hardware-software trade-offs must be made for various signal processing baseband kernels. Dedicated hardware for a kernel provides higher speed and p…
View article: On the Generalization of Machine Learning for mmWave Beam Prediction
On the Generalization of Machine Learning for mmWave Beam Prediction Open
<p>Owing to the crucial importance of the beam management (BM) procedure in millimeter-wave (mmWave) communication systems, machine learning (ML)-based beam prediction is currently being studied in the 3rd Generation&n…
View article: On the Application of Reliability Theory to Cellular Network Mobility Performance Analysis
On the Application of Reliability Theory to Cellular Network Mobility Performance Analysis Open
Achieving connectivity reliability is one of the significant challenges for 5G and beyond 5G cellular networks. The present understanding of reliability in the context of mobile communication does not adequately cover the stochastic tempor…
View article: Advancing Spectrum Anomaly Detection through Digital Twins
Advancing Spectrum Anomaly Detection through Digital Twins Open
6G is expected to enable various safety-critical use cases, e.g., in the industrial domain, which require flawless operation of the network.Thus, resilience is one of the key requirements for 6G.A particularly critical point is that 6G, as…
View article: Hardware-Aware Energy Efficiency Optimization in Wireless Communications Using a Gearbox-PHY
Hardware-Aware Energy Efficiency Optimization in Wireless Communications Using a Gearbox-PHY Open
Current wireless networks prioritize spectral efficiency, however, energy efficiency has become crucial due to environmental, monetary, and device design considerations. The recently proposed Gearbox physical layer (PHY) approach dynamical…
View article: Secret Key Generation Rates for Line of Sight Multipath Channels in the Presence of Eavesdroppers
Secret Key Generation Rates for Line of Sight Multipath Channels in the Presence of Eavesdroppers Open
In this paper, the feasibility of implementing a lightweight key distribution scheme using physical layer security for secret key generation (SKG) is explored. Specifically, we focus on examining SKG with the received signal strength (RSS)…