Sensorlab / Publications


Miha Mohorcic
LOG-a-TEC testbed applications in TVWS
CREW workshop on TV white spaces, Dublin, Ireland

LOG-a-TEC testbed is part of Jožef Stefan Institute's contribution to the CREW federation. The testbed is based on the VESNA wireless sensor network platform and consists of 50 remotely-controlled VESNA devices deployed in an out-door environment on public lighting infrastructure in the town Logatec. VESNA devices form a wireless mesh network and are equipped with three different types of radio transceivers that allow experimentation with novel radio-frequency communication technologies. Two clusters, one in a city centre and one in an industrial zone, enable experimenters to evaluate their solutions in realistic environments. In addition to supporting experiments in the unlicensed 868 MHz and 2.4 GHz bands, a subset of devices in the testbed also supports operation in the TV part of the UHF band. This allows the testbed to be used in research into TV white spaces with a focus on spectrum sensing using low-cost, low-complexity devices. Integration of the testbed with the GRASS/RaPlaT radio planning tool further makes possible to plan experiments and compare results with predictions based on various propagation models.

Thus far, the LOG-a-TEC testbed has been used within the project to compare the DVB-T and wireless microphone detection capabilities of different spectrum sensing equipment used in the CREW federation as well as two radio propagation planning tools. In the second CREW open call an external experiment has been accepted in which the testbed will be used in creation of a dynamic white spaces geo-location database. By merging static information obtained from Slovenian broadcasters with near real-time channel occupancy data obtained from the LOG-a-TEC sensor network a database will be established that will provide white-space spectrum opportunities to mobile devices, taking into account exclusion areas for both registered and primary users detected through spectrum sensing.
This presentation will focus on functional capabilities of the testbed and on the example experiments conducted so far using the testbed.
Topic: system
Type: workshop


As part of activities in the FP7 CREW project the Department of Communication Systems at JSI installed two VESNA SNE-ESTHER devices in London. SNE-ESHTER is a radio receiver for the UHF band designed at JSI based on the VESNA sensor platform. Installed devices will be used for advanced spectrum sensing, contributing to the large scale Ofcom TV White Spaces pilot. One device was installed on the roof of a building in the King's College London Strand campus and the other on the roof of Queen Mary University London. Long term measurements will be used to support the experimentation with advanced, so called cognitive radio devices, as secondary users in currently unused parts of the spectrum.

Marko Pesko, Miha Smolnikar, Matevz Vucnik, Tomaz Javornik, Milica Pejanovic-Djurisic and Mihael Mohorcic published a paper titled "Smartphone with augmented gateway functionality as opportunistic WSN gateway device" in Wireless Personal Communications journal. They described how a Samsung phone connected via Bluetooth to a VESNA sensor node can act as a gateway to a wireless sensor network.

Chapter "Low-cost testbed development and its applications in cognitive radio prototyping" written by our colleagues Tomaž Šolc, Carolina Fortuna and Mihael Mohorcic has been published by Springer in the book  "Cognitive Radio and Networking for Heterogeneous Wireless Networks" from the Recent Advances and Visions for the Future series.

Jernej and Klemen talked with Nickola Naous about our new VESNA sensor node design. Read about The engineers behind the WSN Vesna on the IoTMonkey blog.

The CREW project entered a continuous open access phase. You can test your cognitive radio networking solution on 5 differrent testbed islands and advanced radio components, including our LOG-a-TEC testbed and the VESNA sensor network platform.

In cooperation with Adria Mobil we are developing a motorhome for the future. Adria Moving Lab is equipped with intelligent sensors that allow the vehicle to adapt to its user. This way we can optimize the use of consumables like fuel and water and exploit renewable sources of energy like solar power. The prototype has been unveiled at the Institute Jožef Stefan open days in April 2014.

Our paper "Trends in the development of communication networks: Cognitive networks" is the 10th among the 25th most cited articles published since 2009, extracted from Scopus, see all on the Elsevier web site.

Check the "Cognitive radio experimentation with VESNA platform" presentation by Miha Smolnikar at the School on Applications of Open Spectrum and White Spaces Technologies.

We are looking for a C programmers that would join the team developing the VESNA platform. Candidates that have previous experience with electronic circuit design, operating systems or open source projects will have priority.


We are constantly open for talented, open minded and hard working undergraduate students, interns and MSc/PhD candidates. Read more.

[ more highlights ]


Dynamic composition of communication services

Carolina Fortuna

Orchestrating Virtual Wireless Networks from Shared Resource Pools
Luiz DaSilva

VESNA in Kognitivni Radio

Tomaž Šolc

[ more videolectures ]


SensorNetwork testbed
Mash-up demo.


GSN demo

[ more demos ]

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