Projects / Programmes source: ARIS

Telecommunication systems

Research activity

Code Science Field Subfield
2.08.00  Engineering sciences and technologies  Telecommunications   
2.07.00  Engineering sciences and technologies  Computer science and informatics   

Code Science Field
T180  Technological sciences  Telecommunication engineering 

Code Science Field
2.02  Engineering and Technology  Electrical engineering, Electronic engineering, Information engineering 
telecommunication networks, mobile communication systems, satellite communications, high altitude platforms, broadband wireless access, radio channel, adaptive traffic routing, adaptive MIMO systems, telecommunication system modeling and simulation, modulation, coding, signal detection, digital signal processing, protocol, signaling
Evaluation (rules)
source: COBISS
Researchers (14)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  32333  Gregor Berke  Telecommunications  Researcher  2010 - 2011 
2.  35934  PhD Klemen Bregar  Telecommunications  Junior researcher  2013 - 2014  36 
3.  26452  PhD Tine Celcer  Telecommunications  Researcher  2009 - 2011  33 
4.  29521  PhD Carolina Fortuna  Telecommunications  Beginner researcher  2009 - 2014  155 
5.  26025  PhD Andrej Hrovat  Telecommunications  Researcher  2009 - 2014  230 
6.  07109  PhD Tomaž Javornik  Telecommunications  Researcher  2009 - 2014  435 
7.  05209  PhD Gorazd Kandus  Telecommunications  Head  2009 - 2014  556 
8.  15087  PhD Mihael Mohorčič  Telecommunications  Researcher  2009 - 2014  476 
9.  12765  PhD Roman Novak  Telecommunications  Researcher  2009 - 2014  143 
10.  09856  PhD Igor Ozimek  Computer science and informatics  Researcher  2009 - 2014  178 
11.  33353  PhD Erik Pertovt  Communications technology  Junior researcher  2010 - 2014  23 
12.  26466  Miha Smolnikar  Telecommunications  Researcher  2009 - 2013  100 
13.  17167  PhD Aleš Švigelj  Telecommunications  Researcher  2009 - 2014  247 
14.  25645  PhD Andrej Vilhar  Telecommunications  Researcher  2009 - 2014  116 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  90,706 
The research group is concerned mainly with the research, design and simulation of terrestrial and satellite mobile communication systems, wireless broadband access networks and ad hoc networks. Other research activities embrace the development of software tools for simulation of communication systems, provision of services in telecommunication networks and development of distributed environments for computer supported co-operative work and teleworking. In the field of radio communications we are studying adaptive modulation and coding techniques, synchronization and equalization techniques, and techniques to assess the quality of radio channel. We started with the investigation of space-time coding and multiplexing schemes in MIMO wireless systems. In the field of satellite communications we investigate connectionless per-hop traffic class dependant routing. We are considering Real Time, High Throughput and Best Effort traffic classes. The results showed, that the implementation of traffic class dependant routing significantly improves the performance of all three classes regardless of the traffic load. The research results have been published in several international journals. We are studying communication systems based on high altitude platforms. The aim of the research is to design a telecommunication infrastructure based on the high altitude platforms and capable of provision of broadband services from the stratosphere. We are particularly interested in the applications, based on the internet protocol. We are cooperating with Health Insurance Institute of Slovenia in the field of security policy of the Health Insurance Card System of Slovenia. We are studying security issues of smart card access over the Internet. We are studying non-invasive attacks on smart cards techniques and looking for appropriate countermeasures. We are building simulation models and tools enabling design of the elements of next generation networks. Studying advanced algorithms, techniques, and technologies at various layers of OSI model we are identifying key elements which determine limitations and improve efficiency and capability of communication systems. At physical and data link layer we are interested in such algorithms which are spectral efficient while at network layer we are looking mainly for efficient routing taking into account the quality of service requirements. At physical layer we are assessing the performance of algorithms with SPW and MATLAB simulation tools while at network layer we are using OPNET Modeler. We are capable to test and to implement our solutions in DSP, FPGA and ASIC technologies.
Significance for science
The proposed program includes a number of innovative elements that are important for the development of science and technologies in the field of communication networks and services, and is mainly dedicated to wireless communication systems. In the period 2009-2014 members of the programme team published 55 scientific articles, 33 of these in international journals with an impact factor. Research achievements were also presented at international conferences, 128 papers have been published in in the proceedings of national and international conferences. We have given 13 invited lectures at foreign universities. Important research achievements of the reporting period are two patents granted by the USPTO and the scientific monograph issued at a prominent international publisher Wiley. The patents are addressing the management and operation of self-organizing networks, while the book provides state of the art overview in high-altitude platforms enabling broadband communications technologies. The research results contributed also to a broader recognition of the research methodology that includes research prototyping and experimentally driven research in the area of wireless sensor networks. Quality of our research results is also reflected in high number of WoS/Scopus citations which for the period 2009 – 2014 amounts to 517 units. Research activities in the area of efficient and robust radio interface contributed to the development of methodology and procedures for cross-layer design of a protocol stack in wireless communication systems with the emphasis on adapting to radio channel variations and QoS requirements. The proposed procedures are directly applicable to the next generation wireless and mobile networks. Cross-layer design procedures were incorporated also in the research activities on cognitive radio networks, which represent relatively new concept for radio spectrum and network management and enable more autonomous network operation. Important scientific achievements were also obtained in the area of wireless broadband communication systems, where we designed new adaptive coding and modulation techniques taking into account the state of radio channel and enabling variable bit-rate transmission. We also developed a series of new iterative decoding techniques in the area of multi-antenna systems. Based on new insights we designed new and adapted existing advanced signal and data processing techniques, which make use of distributed computational capabilities and take into account limited energy resources, and are adapting to traffic conditions and requirements of the applications, services and users.
Significance for the country
Telecommunications represent an important part of Slovenian infrastructure with a great influence to social, economic and cultural progress of the society. Services such as telemedicine, distance learning, teleworking, teleshoping, etc. improve diagnostics in medicine, broaden knowledge, reduce time consumption, improve working conditions and raise quality of life. An important part of the research program for the period 2009 – 2014 was devoted to Slovenian companies with which we have cooperated. For Telekom Slovenia we developed a simulation model of its entire fixed network aiming at network performance evaluation, which is useful both for the network design and optimisation as well as for the introduction of new services. With our simulation model we have analysed the influence of introduction of new IP TV services on the performance of fixed access network. For Slovenian national mobile operator Mobitel we developed a software tool GRASS-RaPlaT, which consists of modules for radio wave propagation, radio coverage calculation and presentation, and statistical analysis. The tool is based on methods such as Okumura-Hata, Walfish-Ikegami, 9999 and ray-tracing, which are integrated in an open-source GIS environment GRASS. It is suitable for radio network planning in various mobile and wireless networks including GSM, UMTS, WiFi, WiMAX and LTE. The tool is integrated in Mobitel’s inhouse software suite for radio network monitoring and is used on a daily basis. We have also prepared a user-friendly version of GRASS-RaPlaT tool, which is openly accessible from the JSI website. For the company 4G Neuron we developed a novel procedure and the algorithm for determining node location using received signal strength and time difference of arrival. We cooperated with 4G Neuron also in the design of new algorithms and protocols for WiMAX pico base station with mesh router functionality. Two US patents were granted at the USPTO for these procedure and algorithm. Within the Competence Centre OPCOMM we cooperated with companies Alpineon, Cosylab, Špica International, InovaIT, Telekom Slovenije and Iskratel in the design of an open communication platform for the development of new services and applications for the Internet of Things. We participated in the design of a communication system that enables the collection of different types of data from sensor networks as well as their context information. In collaboration with the Municipality of Logatec and Public Utilities Company Logatec we set up an open sensor network testbed LOG-a-TEC, which allows the detection and analysis of availability of radio spectrum in the ISM and UHF frequency bands and is based on the sensor platform VESNA also developed at JSI. The LOG-a-TEC testbed is the only experimental network for cognitive radio networking operating in the real outdoor environment, which is available for national and foreign research groups. We participated to two technology development projects financed by MEDT, namely "Smart caravan" and "Smart home". In the first one, we were developing with Adria Mobil sensor and communication technologies for the intelligent remote management of energy efficient motorhomes. In the other project we were developing together with the company Cosylab the sensor and communication technologies for smart buildings, with an emphasis on monitoring generation and consumption of electric energy. Several members of the program team were involved in teaching at the Jozef Stefan International Postgraduate School, so the newly acquired knowledge was also transferred to students and young researchers, and thus indirectly to the industry where they were or would be employed. With the realisation of the research programme we broadened the knowledge and gained experience that is beneficial to national and European economy for the more efficient use of existing and development of new communication systems and services.
Most important scientific results Annual report 2009, 2010, 2011, 2012, 2013, final report, complete report on dLib.si
Most important socioeconomically and culturally relevant results Annual report 2009, 2010, 2011, 2012, 2013, final report, complete report on dLib.si
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