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Dr. Thomas Janson



  • Dr. rer. nat. Thomas Janson
    Computer Networks and Telematics 
    Albert-Ludwigs-University Freiburg
    Georges-Koehler-Allee 51
    79110 Freiburg
  • Building 51
  • Office 02-035
  • Telephone: +49 761 203 8175
  • Telefax: +49 761 203 8182
  • E-Mail: thomas_janson_email.png
  • Web:








Journals / Conferences / Workshops

  • Thomas Janson, Alexander Ens, and Christian Schindelhauer. Turning Interferences into Noise in Ad Hoc Networks, Telecommunication Systems, August 2015
  • Thomas Janson and Christian Schindelhauer. Cooperative Beamforming in Ad-Hoc Networks with Sublinear Transmission Power. In 2nd International Workshop on GReen Optimized Wireless Networks (GROWN’14), Larnaca, Cyprus, October 2014 (pdf)
  • Thomas Janson and Christian Schindelhauer. Self-Synchronized Cooperative Beamforming in Ad-Hoc Networks. In Proceedings of the 16th International Symposium on Stabilization, Safety, and Security of Distributed Systems (SSS'14), Paderborn, Germany, September 2014 (pdf)
  • Alexander Ens, Thomas Janson, Leonhard M. Reindl, Christian Schindelhauer. Robust Multi-Carrier Frame Synchronization for Localization Systems with Ultrasound. In Proceedings of the 18th International OFDM Workshop 2014 (InOWo’14), Germany, 2014 (pdf)
  • Alexander Ens, Thomas Janson, Leonhard M. Reindl, Christian Schindelhauer. Low-Power Simplex Ultrasound Communication for Indoor Localization. In the 22nd European Signal Processing Conference (EUSIPCO 2014), Lisbon, Portugal, 2014 (pdf)
  • Liaquat Ali, Thomas Janson, Georg Lausen, and Christian Schindelhauer. Towards Load Balancing and Parallelizing of RDF Query Processing in P2P Based Distributed RDF Data Stores. In 22nd Euromicro International Conference on Parallel, Distributed and network-based Processing (PDP 2014), Turin, Italy, February 2014 (pdf)
  • Liaquat Ali, Thomas Janson, Georg Lausen, and Christian Schindelhauer. Effects of Network Structure Improvement on Distributed RDF Querying. In 6th International Conference on Data Management in Cloud, Grid and P2P Systems (Globe 2013), Prague, Czech Republic, August 2013 (pdf)
  • Thomas Janson and Christian Schindelhauer. Broadcasting in Logarithmic Time for Ad Hoc Network Nodes on a Line using MIMO. In Proceedings of the 25th ACM Symposium on Parallelism in Algorithms and Architectures, SPAA ’13, Montreal, Canada, July 2013. ACM. (pdf)
  • Thomas Janson and Christian Schindelhauer. Analyzing Randomly Placed Multiple Antennas for MIMO Wireless Communication. In Fifth International Workshop on Selected Topics in Mobile and Wireless Computing (IEEE STWiMob'2012), Barcelona, Spain, October 2012. (pdf)
  • Johannes Wendeberg, Thomas Janson, and Christian Schindelhauer. Self-Localization based on Ambient Signals. In Theoretical Computer Science, 2011. (online publication)
  • Amir Alsbih,  Thomas Janson, and Christian Schindelhauer. Analysis of Peer-to-Peer Traffic and User Behaviour. In Fourth International Conference on Internet Technologies & Applications (ITA 2011), Wrexham, Wales, September 2011 (highly commended technologies paper award). (pdf)
  • Liaquat Ali, Thomas Janson, and Georg Lausen. 3rdf: Storing and Querying RDF Data on top of the 3nuts Overlay Network. In 10th International Workshop on Web Semantics (WebS 2011), Toulouse, France, August 2011 (pdf
  • Thomas Janson, Peter Mahlmann, and Christian Schindelhauer. A self-stabilizing locality-aware peer-to-peer network combining random networks, search trees, and dhts. In Proceedings of the 16th International Conference on Parallel and Distributed Systems (ICPADS’10), pages 123–130. IEEE, 9- 10 December 2010. (pdf)
  • Thomas Janson, Christian Schindelhauer, and Johannes Wendeberg. Self-localization application for iphone using only ambient sound signals. In International Conference on Indoor Positioning and Indoor Navigation (IPIN) Proceedings. IEEE, 15-17 September 2010. (pdf)
  • Thomas Janson, Christian Schindelhauer, and Johannes Wendeberg. Self- localization based on ambient signals. In 6th International Workshop on Algorithms for Sensor Systems, Wireless Ad Hoc Networks, and Autonomous Mobile Entities ALGOSENSORS 2010, volume 6451 of Lecture Notes in Computer Science, pages 176–188, Bordeaux, France, 5 July 2010. Lecture Notes in Computer Science. (pdf)
  • Thomas Janson, Christian Schindelhauer, and Johannes Wendeberg. Self- localization application for iphone using only ambient sound signals. In International Conference on Indoor Positioning and Indoor Navigation (IPIN) Abstract Volume, June 2010. (pdf)


Conference Talks und Poster

  • Thomas Janson. Survey on MIMO-related Technology, In 4th Workshop on Realistic Models for Algorithms in Wireless Networks (WRAWN 2013), July 2013. (slides
  • Alexander Ens, Fabian Höflinger, Thomas Janson, Johannes Wendeberg,  Leonhard Michael Reindl, Christian Schindelhauer. eCULTS: energy autacrtic Configuration-free Ultrasonic Tracking System, In Proceedings of MicroTEC Südwest - Cluster Conference, Stuttgart, Germany, 2013 (Poster)
  • Peter Mahlmann, Thomas Janson, and Christian Schindelhauer. 3nuts: A Top-Down Peer-to-Peer Network (Poster). European Conference on Complex Systems (ECCS 2005), Paris, France, 2005. (pdf)


Technical Reports

  • Thomas Janson and Christian Schindelhauer. Receiving Pseudorandom PSK. September 2015. (pdf)
  • Thomas Janson and Christian Schindelhauer. Ad-Hoc Network Unicast in O(log log n) using Beamforming. May 2014. (pdf)
  • Thomas Janson, Peter Mahlmann, and Christian Schindelhauer. 3nuts: A locality-aware peer-to-peer network combining random networks, search trees, and dhts. Technical Report tr-ri-09-309, Heinz Nixdorf Institute, Paderborn, Germany, December 2009. (pdf)



  • Thomas Janson. Energy-Efficient Collaborative Beamforming in Wireless Ad Hoc Networks. PhD thesis, University of Freiburg, Juli 2015. (pdf)
  • Thomas Janson. Implementierung und Evaluation eines semantischen Peer-to-Peer Netzwerks. Master’s thesis, University of Paderborn, August 2009. (pdf)
  • Thomas Janson. Implementation of pointer-push&pull operation for maintenance of random graphs in peer-to-peer networks. Bachelor’s thesis, University of Paderborn, 2006.  (pdf)






Lecture Assistance / Exercises

Seminars, Proseminars 

Students' theses

  • Michael Hönig, Frequenzabhängigkeit von Multipfad-Signalen, bachelor thesis (ongoing)
  • Fabienne Marx, Simulation und Implementierung eines Kommunikationsprotokolls mit Robustheit gegen Jammer, master thesis (ongoing)
  • Claudia Ziaja, Perfect Party Communication - Implementation and testing of DPSK with additional pseudo-random phases, bachelor thesis (March 2015)
  • Michael Hönig, Simulation eines Algorithmus zur Datenübertragung in Ad-Hoc Sensornetzen mit logarithmischer Übertragungsdauer bei sublinearem Energieverbrauch, bachelor project (März 2015)
  • Florin Godard, A Review of Noise Interference Models in Theoretical Computer Science, bachelor thesis (April 2013)
  • Maziyar Khorrami Dastjerdi, Sonic Waves Emission By Multiple Number of Speakers, master project (February 2013)
  • Michael Rist, Konstruktives und destruktives Beamforming eines Signals mit Hilfe koordinierter Antennen, master thesis (November 2013)
  • Dennis Gauß, Implementation of a Simulator for Wireless Networks with Smart Antennas, bachelor thesis (February 2011)
  • Shyamala Villupuram Sundararaman, Statistical Behavior Of Peer To Peer Networks, master thesis (January 2011)
  • Evaluating SPARQL Queries on 3nuts, diploma thesis (Oktober 2010)
  • Christian Cordes, Benutzerverhalten in Peer-to-Peer-Netzwerken, diploma thesis (November 2010)






AudioLocationFinder: AudioLocationFinder

3nuts peer-to-peer network: 3nuts 

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