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Wireless networks are often modeled using tools from stochastic geometry. A team of researchers from Klagenfurt, Athens, and Notre Dame now contributed to these tools by solving general sum-product functionals for Poisson point processes. Link outage probabilities are derived for networks with interference and Nakagami fading. Multiple access interference in wireless networks occurs if the…

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Aerial delivery services using small unmanned aerial vehicles (UAVs) have been proposed by major online retailers, logistics companies, and startups. An interdisciplinary project team at the University of Klagenfurt aims at contributing to the architectural setup and distributed control of such future systems. Small UAVs have found their way to civil applications. A broad variety…

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Samira Hayat was one of the few women in Pakistan studying electrical engineering. She is now a researcher and doctoral student in Bettstetter’s team working on wireless communications for networked unmanned aerial vehicles. Karin Krichmayr interviewed her for the Austrian newspaper “Der Standard”. Read the article “Ich war schon immer eine Rebellin” in German language.…

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Small unmanned aerial vehicles (UAVs) are more and more used in civil applications, for example, in disaster situations to provide rescue teams with up-to-date aerial photos. The wireless communications to UAVs and between UAVs is an important building block in such systems. Researchers from U Klagenfurt, U Toronto, ETH Zürich, and the German Aerospace Center…

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The Institute of Networked and Embedded Systems and Lakeside Labs opened their laboratories to the public on March 11. About 120 visitors informed themselves and discussed about ongoing research in the domains of mobile systems, pervasive computing, self-organizing systems, multimedia systems, and smart energy grids. A presentation given by Christian Bettstetter opened the event. He…

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The mathematical modeling of pulse-coupled biological oscillators offers a fully decentralized and scalable approach for time synchronization. There is a broad spectrum of work on pulse-coupled oscillators in physics, biology, neuroscience, and other disciplines. The communications engineering community has been interested to transfer these results to the synchronization of nodes in wireless networks. A one-to-one…

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Wireless communication from a sender to a receiver is significantly affected by the interference generated by other devices. If devices in the vicinity of the receiver transmit at the same time and on the same frequency channel, their signals interfere at the receiver with the intended signal from the sender and thus impede proper reception.…

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Autonomously flying robots — also called small-scale unmanned aerial vehicles (UAVs) — are more and more exploited in civil and commercial applications for monitoring, surveillance, and disaster response. For some applications, it is beneficial if a team of coordinated UAVs rather than a single UAV is employed. Multiple UAVs can cover a given area faster…

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The key idea behind cooperation in wireless networks is that devices help each other to communicate messages properly over the air. When a transmitter sends messages to a receiver, adjacent devices can overhear these messages. If the direct transmission to the receiver fails, one of those devices can retransmit (“relay”) its message copy to the…

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Metal parts in factory halls disturb wireless communications. ICT researchers from Klagenfurt invented a new transmission technique and are now looking for partners for implementation. Although the need for fast and reliable data transmission via WLAN increases in production halls, the technology is still limited. Mobile machinery, forklifts, and robots disturb the radio link between…

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As part of a new series on research excellence, Romy Müller from the university magazine UNIsono recently interviewed Christian Bettstetter. “You have to enjoy research, be diligent and lucky to achieve success in science,” Bettstetter says. Good MSc graduates are recommended to target a PhD to later on have the choice to either stay in…

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Wireless communications often suffers from error bursts — a long sequence of bits is corrupted when being transmitted over the air. A relatively new technique that tries to mitigate this unreliability is cooperative relaying. Its basic idea is simple: When a device transmits data packets to a destination, adjacent devices can overhear these packets. If…

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The Lakeside Labs project cDrones started in 2008 as an effort of four Klagenfurt professors to work on system-level aspects of small-scale unmanned aerial vehicles for application in disaster management. Using off-the-shelf, low-altitude multicopters equipped with high-quality cameras and GPS, the project team developed a software that enables an autonomous system for aerial reconnaissance. The…

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The Lakeside Labs project SOSIE takes an interdisciplinary perspective on decision making in networks suffering from information errors. Human organizations and technical communication systems are compared to identify similarities and differences during decision making processes. Successful techniques may then be transferred from one discipline to the other. Friederike Wall, who initiated the project together with…

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A scientific colloquium in honor of Jörg Eberspächer was held at Technische Universität München on December 7, 2012. Eberspächer founded the Institute of Communication Networks in 1990 and retired as professor emeritus some weeks ago. The responsibilities were handed over to his successor, Wolfgang Kellerer, a PhD graduate of Eberspächer and then senior manager at…

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Researchers at Klagenfurt’s Lakeside Labs work on self-organizing wireless networks which should eventually allow communication between vehicles. Günther Brandner was interviewed by Markus Böhm from the Austrian daily newspaper Der Standard. “Cars are already computers on wheels. We just need to make them talk to teach other,” he says. The team is currently testing the…

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Multiple-access interference in wireless networks has significant impact on diversity techniques and protocols. Bettstetter and Schilcher aim at gaining a deeper understanding of interference dynamics and to rigorously analyze its impact on system performance. They secured funding by the Austrian Science Fund (FWF) in the order of 350.000 EUR for their new project INDY. “The…

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Synchronization emerges in a variety of systems ranging from fireflies and neural networks in biology, to coupled lasers, wireless communication, and Josephson junctions in physics and engineering. Sometimes the goal is to avoid synchrony, e.g., during Parkinson tremor or epileptic seizures, sometimes to achieve synchrony, e.g., in heart pacemakers, lasers, electric power grids and communication…

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The cDrones team at Lakeside Labs, Klagenfurt, develops a system for multiple unmanned aerial vehicles (UAVs) to provide a high-quality aerial overview image of a given area of interest. Evsen Yanmaz explains: “It only takes a few mouse clicks for operators to define the area to be observed. To provide for autonomous coverage of the…

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Information and communication technology is one of the most significant forces driving technical and economic progress throughout the world. ICT systems are part of our daily lives both at work and at home: We communicate via mobile phones, enjoy multimedia entertainment via the Internet, and share digital photos and videos with our families and friends.…

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Cooperative relaying has been developed for wireless communications to mitigate the negative effects of small-scale fading caused by multipath propagation. A huge amount of research has been done in the past ten years to assess benefits and drawbacks of such techniques by simulations and analytical means. It is surprising, however, that only few studies with…

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The Austrian federal minister for science and research, Karlheinz Töchterle, visited Lakeside Labs in Klagenfurt. He and his delegation received an overview of research activities and a short demonstration of aerial robots. A press conference concluded the meeting. Professor Töchterle also participated in a plenary discussion in the afternoon and gave a talk titled “Mass…

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Some protocols and applications in mobile computing require that a device knows as to how many other devices exhibiting a certain attribute are in its radio coverage. Obtaining this cardinality information by message exchange between devices is reliable but inefficient in dense networks in terms of overhead and delay. Performing an estimation of the cardinality…

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Helmut Adam will receive the dissertation award of the Austrian Society for Information and Communication Technologies (GIT-OVE) for his dissertation on cooperative diversity protocols in wireless networks. The award ceremony will take place in Vienna in May 2012. Adam was research and teaching staff member in Klagenfurt’s mobile systems group from mid 2006 until mid…

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Freezing rain causes an accident on a highway. Sensors attached to cars detect this event and communicate it via WLAN to other cars to inform oncoming drivers. The implementation of new WLAN technologies for car-to-car communication is running at full speed. Bettstetter and his team have also been tackling this problem. Their key ideas lead…

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Interference has significant impact on the performance of wireless communication systems. A comprehensive understanding of its dynamic behavior over time is important for the design of diversity schemes and protocols, whose performance can severely degrade in case of highly-correlated interference. Schilcher, Bettstetter, and Brandner aim at advancing this emerging field from a theoretical perspective. Their…

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Computers processors have been leaving offices and become more and more embedded into everyday objects. Enhanced with sensors and networked via wireless connections, these computerized objects allow new fields of application, such as smart homes and remote health monitoring. The IEEE/ICE Summer School on Networked Embedded Systems features research-oriented lectures on selected topics in this…

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Crisostomo, Schilcher, Bettstetter and Barros investigate probabilistic information dissemination in stochastic networks. The following problem is studied: A source node intends to deliver a message to all other network nodes using probabilistic flooding, i.e., each node forwards a received message to all its neighbors with a forwarding probability ϖ. Question is: which minimum ϖ-value needs…

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Engineers are trying to exploit the behavior of insect swarms for the design of socio-technical systems. Experts from ten countries and various disciplines are currently discussing this field of research during the Research Days hosted by Lakeside Labs in Klagenfurt. Concepts from self-organization should be applied, for example, to future mobile communication networks and energy…

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The synchronous flashing of fireflies is a spectacular example for self-organization in nature. Thousands of fireflies gather in trees and flash in unison using a distributed mechanism that can be understood using the theory of coupled oscillators. This theory has successfully been used for modeling many other synchronization and coordination phenomena, such as sleep cycles,…

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How to improve the robustness of WLAN communications? Researchers at Klagenfurt’s mobile systems group lead by Christian Bettstetter aim at answering this question. “I expect performance gains using the concept of cooperation between devices,” the 38-year old professor says. If data transmission between a notebook and a WLAN station fails, another notebook or any mobile…

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Lakeside Labs is now offering content on Apple iTunes U, the leading platform for educational videos. Categories include lectures from scientists, courses on academic careers, interviews with researchers, and research highlights. Launch it now on your computer, iPad, or iPhone. Users of other tablets or smart phones are invited to check the Lakeside Labs channel…

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About 50 participants from 16 countries attended the Fifth International Workshop on Self-Organizing Systems hosted by Martina Zitterbart and her team in Karlsruhe (Germany). The two-day event started with an exciting keynote address of Hermann Haken, a pioneer in the field of self-organizing systems. He outlined his work ranging from laser theory to information theory…

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Information and communication systems become increasingly complex. Sascha Aumüller from the daily newspaper Der Standard talked with Christian Bettstetter about this problem. The interview “Nobody likes to call the sysadmin” is about self-organization that can help to overcome the limitations of today’s technological possibilities. Lakeside Labs founder Bettstetter also talks about his current projects and…

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The University of Klagenfurt and the Lakeside Park will host the 2010 Science Night (Lange Nacht der Forschung) on November 5. At over 100 stations, scientists and engineers will introduce and demonstrate their research topics to the public. Bettstetter’s team will participate with the following stations: How do microdrones explore a disaster area? Fireflies playing…

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The annual ITG symposium on future perspectives of communication networks will this year focus on Self-Organization: Opportunities and Challenges. To be held in Stuttgart on October 7, it will cover a broad variety of topics and a well-balanced set of speakers, not only from academia but also from industry. The keynote speech will be given…

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The mobile systems group at the University of Klagenfurt released a new flyer. It gives a quick overview of research and teaching activities, infrastructure, collaborations, awards, Lakeside Labs, and the European doctoral school ICE. Download a high-res electronic version or order a free paper copy at NES@uni-klu.ac.at.

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The Lakeside Labs project cDrones performs research on networked unmanned aerial vehicles (UAVs) and their application to emergency and disaster response. Current work focuses on UAV routing, image stitching, and system integration. The video below demonstrates the following use case: An emergency response person specifies an area of interest in a map, and the system…

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The newspaper Der Standard reports in its weekly science and technology section about cooperative relay communications in wireless systems. Based on an interview with Christian Bettstetter, the article “Gemeinsam gegen die Funkstille” explains that mobile devices could help each other to achieve higher energy efficiency and better radio coverage. Read online or download:

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The research proposal “Robust Self-Organizing Slot Synchronization in Networked Embedded Systems” (for short: ROSSY) received a three-year full funding from the Austrian research funding agency FFG. Our goal is to design and assess a robust self-organizing synchronization algorithm suited for wireless networked embedded systems. The algorithm operates in a completely distributed manner and is adaptive…

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Slot synchronization is an essential requirement in communication and control networks, used for medium access, scheduling of sleep phases, and collaborative sensing, to give some examples. Having been inspired by the biological phenomenon of synchronously flashing fireflies, a method for self-organizing slot synchronization suited for wireless systems has been developed. It is based on the…

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Infineon’s CTO, Reinhard Petschacher, and the two professors Mario Huemer and Christian Bettstetter discussed about the topic of cooperation between industry and universities. How does cooperation start? How are win-win situations achieved? What are sensitive issues in such collaborations? The dialog is part of the book Wissen schaffen, which illustrates the variety of research activities…

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