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Publications

Zoltan Padrah
Distributed Spectrum Sensing in Unlicensed Bands Using the VESNA Platform
MSc thesis, MPS, Ljubljana, Slovenia.

Some of the concepts and methods for more ecient utilisation of radio spectrum dependon better knowledge of the changing availability of radio resources with time and location,which can be provided by various spectrum sensing approaches. This thesis presentsthe design and implementation of a spectrum sensing testbed, based on low-cost and lowcomplexityVESNA platform, aimed to support experimental-driven research in cognitiveradio and networking.

First, the state of the art in spectrum sensing methods has been surveyed. Based on therequirements of di erent sensing algorithms, it has been concluded that the energy detectionsensing method is the most suitable for our purposes. Following this decision, a stand-alonespectrum sensing prototype has been developed, which uses a speci c radio module andsoftware application. This prototype consists of two parts: the sensing part implementedon VESNA and the control and data collection part implemented on a PC. This standalonespectrum sensing prototype has been calibrated and integrated in a heterogeneoussensing system. In this system, it has been used to collect data about received signal powerat multiple locations in a laboratory, for several locations of a continuously transmittingsignal generator. By presenting obtained experimental results, correct functioning of thecalibrated sensing prototype is demonstrated. In a subsequent experiment in more controlledenvironment, the accuracy of the stand-alone prototype has been determined by measuringa known continuous signal with multiple devices at multiple locations and comparing theresults of di erent device types by using a very simple propagation model.

Multiple VESNA based spectrum sensing prototypes have then been integrated in adistributed spectrum sensing testbed. The testbed consists of two parts: the remote outdoordeployment of multiple VESNA devices and the central management and control system. Inorder to select the locations of the VESNAs forming the testbed, extensive wireless networkdesign including on the spot measurements has been carried out to ensure that the deployedsystem will function correctly. The complex communication systems and the requirementfor the testbed to function without the need of physical intervention have resulted in thedevelopment and use of a custom protocol, because the standardized alternatives would haverequired more e ort to implement.

The thesis presents an example of planning and executing a spectrum sensing experimentin the deployed testbed. In order to support easier and more correct experiment planning,radio link measurements have been performed to determine the coverage areas of individualtransceivers. Next, an example experiment, consisting of an emulated interference avoidancescenario, has been planned and performed with a preselected set of nodes. The obtainedexperimental results are in line with the expected values, proving the correct functioning ofthe testbed.

Topic: hardware
Type: thesis
Download: PDF | PPT

Highlights

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 ]

Videolectures


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 ]

Demos


SensorNetwork testbed
Mash-up demo.

 

GSN demo

[ more demos ]

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