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The core activities of the Department of Communication Systems comprise research, development and design of next-generation telecommunication networks, technologies and services; wireless communication, embedded and sensor systems; and new procedures and algorithms for the parallel and distributed computing. Within these activities our research work includes the development of the methods and software tools for modelling, simulation, analysis and synthesis of communication systems, computer simulations supporting biomedical procedures and specialised equipment and procedures for advanced bio-signal processing and interpretation.
Research and development activities at the department are carried out in the framework of the Communication Technology Laboratory (CTL), the Parallel and Distributed Systems Laboratory (PDSL) and the Networked Embedded Systems Laboratory (NESL). The research work of the three laboratories is complementary, which is particularly reflected in the joint applied projects.
· The research activities within the Communication Technology Laboratory are mainly concentrated on different challenges associated with the wireless access segment technologies enabling the end-users to access new multimedia services and applications. The emphasis is on the radio propagation, access architectures for heterogeneous wireless networks, management of radio and network resources and cognitive communications.
· The Parallel and Distributed Systems Laboratory is focusing on the investigation of parallelization of algorithms and their efficient implementation on parallel and distributed computers, with the emphasis on modelling and simulating complex systems and processes in the fields of Chemistry, Biology and Medicine.
· The Networked Embedded Systems Laboratory is focusing on the areas of the Internet of Things and cognitive communications. The emphasis is on the vertical integration of different wireless sensor and communication network technologies with semantic technologies in the support of the autonomous search and composition of sensors and sensor data, and for the provision of data gathering or complex system monitoring for different application areas, research and development projects and industrial customers.
Among the main recent achievements of the department it is worth pointing out:
· The research of the radio-signal propagation in special environments, such as long road and railway tunnels, used for emergency situations, with the emphasis on the radio-signal propagation in typical frequency bands for voice communication systems (400 MHz), high-speed data communication systems (2.4 GHz and 3.5 GHz) and low-data-rate wireless sensor networks (868 MHz and 2.4 GHz). We also published a related survey paper.
· A modular and fully flexible wireless sensor networks platform VESNA, developed as the core building block for several research and applied projects. A variety of supported features, protocols and technologies together with the arbitrary combination of developed hardware and software modules, make the VESNA platform well suited for the implementation of the experimental research sensor networks infrastructure, deployment of pilot applications, validation of usage scenarios and development of end-user solutions.
· Investigation and development of new parallel numeric algorithms, e.g., meshless methods, which are local and, hence, efficiently executable on parallel computers. With these methods, one can simulate physical phenomena, e.g, heat and fluid flows, PN junction and molecular dynamics in realistic conditions.
· The development, implementation and testing of the software modules for the radiowave-propagation modelling in mobile-communications systems for rural and urban environment including statistical channel models and channel models based on ray tracing and its integration into the open-source geographic information system (GIS). Modules form an open-source tool RaPlaT.
· Stand-alone and collaborative spectrum sensing in licensed and unlicensed frequency bands in the LOG-a-TEC testbed, originally deployed in collaboration with the Municipality of Logatec and Komunalno podjetje Logatec, currently consisting of approximately 80 sensor nodes installed outdoors, mostly on light poles and rooftops in different regions of Slovenia. The testbed is part of CREW federation, it is recognised as EU FIRE experimental facility and listed in XiPi catalogue of Future Internet infrastructures.
· In the area of biomedical signal measurement and processing we developed a new methodology for synthesising the standard ECG from a small number of differential measurements.
· For the national operator Telekom Slovenije we developed a comprehensive model of their fixed network on which we carry out intensive computer simulation-based performance evaluation of the introduction of new services in the network. We also developed an alarm mining and prediction tool which is used for analysing typical patterns of network alarms.
7FP CREW “Cognitive Radio Experimentation World”
FP7-ICT IP ABSOLUTE “Aerial Base Stations with Opportunistic Links For Unexpected & Temporary Events”
FP7-ICT NoE PlanetData “Network of Excellence PlanetData”
FP7-ICT IP CITI-SENSE “Development of Sensor-based Citizens’ Observatory Community for Improving Quality of Life in Cities”
FP7-ENV CA BalkanGEONet “Balkan GEO Network - Towards Inclusion of Balkan Countries into Global Earth Observation Initiatives”
COST Action IC0902 ”Cognitive Radio and Networking for Cooperative Coexistence of Heterogeneous Wireless Networks”
COST Action IC0906 "Wireless Networking for Moving Objects"
COST Action IC1101 "Optical Wireless Communications − An Emerging Technology"
COST Action IC1104 “Random Network Coding and Designs over GF(q)”
ESA PECS project SatProSi
Competence centre KC OpComm
Competence centre KC CLASS
ARRS basic research project J2-4197 “Advanced procedures for interactive composition of sensor networks”
Mihael Mohorčič (vodja)
Department of Communication Systems
Jozef Stefan Institute
Secretary: +386 1 477 3107