52 citations · 133 across the 22 of their papers we have counts for
24 papers
Grant-Free Random Access of IoT devices in Massive MIMO with Partial CSI
Gilles Callebaut, François Rottenberg, Liesbet Van der Perre +1
The number of wireless devices is drastically increasing, resulting in many devices contending for radio resources. In this work, we present an algorithm to detect active devices f…
Fading in reflective and heavily shadowed industrial environments with large arrays
Sara Willhammar, Liesbet Van der Perre, Fredrik Tufvesson
One of the use cases for 5G systems and beyond is ultra-reliability low-latency communication (URLLC). An enabling technology for URLLC is massive multiple-input multiple-output (M…
Dynamic Federations for 6G Cell-Free Networking: Concepts and Terminology
Gilles Callebaut, William Tärneberg, Liesbet Van der Perre +1
Cell-Free networking is one of the prime candidates for 6G networks. Despite being capable of providing the 6G needs, practical limitations and considerations are often neglected i…
Techtile -- Open 6G R&D Testbed for Communication, Positioning, Sensing, WPT and Federated Learning
Gilles Callebaut, Jarne Van Mulders, Geoffrey Ottoy +4
New concepts for next-generation wireless systems are being developed. It is expected that these 6G and beyond systems will incorporate more than only communication, but also sensi…
Aerial Energy Provisioning for Massive Energy-Constrained IoT by UAVs
Jarne Van Mulders, Guus Leenders, Gilles Callebaut +2
Autonomy of devices is a major challenge in many Internet of Things (IoT) applications, in particular when the nodes are deployed remotely or difficult to assess places. In this pa…
A Multi-band Solution for Interacting with Energy-Neutral Devices
Chesney Buyle, Bert Cox, Liesbet Van der Perre +1
RF Wireless Power Transfer (WPT) emerges as a technology for charging autonomous devices, enabling simultaneous power and information transfer. However, with increasing distance, s…
Array Placement in Distributed Massive MIMO for Power Saving considering Environment Information
Yi-Hang Zhu, Gilles Callebaut, Liesbet Van der Perre +1
Distributed massive MIMO (D-mMIMO) has been considered for future networks as it holds the potential to offer superior capacity while enabling energy savings in the network. A D-mM…
Z3RO Precoder Canceling Nonlinear Power Amplifier Distortion in Large Array Systems
François Rottenberg, Gilles Callebaut, Liesbet Van der Perre
Large array-based transmission uses the combination of a massive number of antenna elements and clever precoder designs to achieve array gain and spatially multiplex different user…
Grant-Free Random Access in Massive MIMO for Static Low-Power IoT Nodes
Gilles Callebaut, Liesbet Van der Perre, François Rottenberg
Massive MIMO is a promising technology to enable a massive number of Internet of Things nodes to transmit short and sporadic data bursts at low power. In conventional cellular netw…
Spatial Distribution of Distortion due to Nonlinear Power Amplification in Distributed Massive MIMO
François Rottenberg, Gilles Callebaut, Liesbet Van der Perre
Due to the nonlinearity of power amplifiers (PAs), the transmit signal is distorted. Previous works have studied the spatial distribution of this distortion for a central massive M…
Keeping up with the bits: tracking physical layer latency in millimeter-wave Wi-Fi networks
Alexander Marinšek, Liesbet Van der Perre
The wireless communications landscape is anticipated to offer new service levels following the introduction of the millimeter-wave (mmWave) spectrum to consumer electronics. With t…
Experimental Exploration of Unlicensed Sub-GHz Massive MIMO for Massive Internet-of-Things
Gilles Callebaut, Sara Gunnarsson, Andrea P. Guevara +3
Due to the increase of Internet-of-Things (IoT) devices, IoT networks are getting overcrowded. Networks can be extended with more gateways, increasing the number of supported devic…
A Primer on Techtile: An R&D Testbed for Distributed Communication, Sensing and Positioning
Gilles Callebaut, Jarne Van Mulders, Geoffrey Ottoy +1
The Techtile measurement infrastructure is a multi-functional, versatile testbed for new communication and sensing technologies relying on fine-grained distributed resources. The f…
Energy Neutral Devices: Can Hybrid RF Acoustic Signals Point Them Out?
Bert Cox, Chesney Buyle, Liesbet Van der Perre +1
We present a hybrid signaling approach to position energy-neutral devices. Our method combines the best of two worlds: instant RF signals for both communication and energy transfer…
Massive MIMO goes Sub-GHz: Implementation and Experimental Exploration for LPWANs
Gilles Callebaut, Sara Gunnarsson, Andrea P. Guevara +4
Low-Power Wide-Area Networks operating in the unlicensed bands are being deployed to connect a rapidly growing number of Internet-of-Things devices. While the unlicensed sub-GHz ba…
A Light Signalling Approach to Node Grouping for Massive MIMO IoT Networks
Emma Fitzgerald, Michał Pióro, Harsh Tataria +3
Massive MIMO is a leading technology to connect very large numbers of energy constrained nodes, as it offers both extensive spatial multiplexing and large array gain. A challenge r…
Channel Hardening in Massive MIMO: Model Parameters and Experimental Assessment
Sara Gunnarsson, José Flordelis, Liesbet Van der Perre +1
Reliability is becoming increasingly important for many applications envisioned for future wireless systems. A technology that could improve reliability in these systems is massive…
High Precision Hybrid RF and Ultrasonic Chirp-based Ranging for Low-Power IoT Nodes
Bert Cox, Liesbet Van der Perre, Stijn Wielandt +2
Hybrid acoustic-RF systems offer excellent ranging accuracy, yet they typically come at a power consumption that is too high to meet the energy constraints of mobile IoT nodes. We…
RadioWeaves for efficient connectivity: analysis andimpact of constraints in actual deployments
Liesbet Van der Perre, Erik G. Larsson, Fredrik Tufvesson +3
We present a new type of wireless access infras-tructure consisting of a fabric of dispersed electronic circuitsand antennas that collectively function as a massive, distributed an…
LoRa Physical Layer Evaluation for Point-to-Point Links and Coverage Measurements in Diverse Environments
Gilles Callebaut, Guus Leenders, Chesney Buyle +2
This paper focuses on Point-to-Point LoRa connections. We report on coverage measurements performed in three distinct environments, i.e., coastal, forest and urban. Our field exper…
Remote IoT devices: sleepy strategies and signal processing to the rescue for a long battery life
Gilles Callebaut, Geoffrey Ottoy, Guus Leenders +3
Long range wireless connectivity opens the door for new IoT applications. Low energy consumption is essential to enable long autonomy of devices powered by batteries or even relyin…
Cross-layer framework and optimization for efficient use of the energy budget of IoT Nodes
Gilles Callebaut, Geoffrey Ottoy, Liesbet Van der Perre
Both physical and MAC-layer need to be jointly optimized to maximize the autonomy of IoT devices. Therefore, a cross-layer design is imperative to effectively realize Low Power Wid…
Channel Hardening in Massive MIMO - A Measurement Based Analysis
Sara Gunnarsson, Jose Flordelis, Liesbet Van der Perre +1
Wireless-controlled robots, cars and other critical applications are in need of technologies that offer high reliability and low latency. Massive MIMO, Multiple-Input Multiple-Outp…
Massive MIMO in Sub-6 GHz and mmWave: Physical, Practical, and Use-Case Differences
Emil Björnson, Liesbet Van der Perre, Stefano Buzzi +1
The use of base stations (BSs) and access points (APs) with a large number of antennas, called Massive MIMO (multiple-input multiple-output), is a key technology for increasing the…