Planning cellular radio telecommunication systems is a complex problem, that can be solved by mathematical models and by using various program tools. An open-source system, such as GRASS, enables free development and improvement of existing mathematical models as well as the use of other modules for data processing. We developed new modules for coverage calculation, based on mathematical models such as Okumura-Hata, 9999 model, etc. The achievement is useful for improved planning of GSM/UMTS networks. It is used also by Mobitel
F.17 Transfer of existing technologies, know-how, methods and procedures into practice
COBISS.SI-ID: 22934567In the simulation environment OPNET we developed a modular simulation model of general telecommunication network, which enables the analysis of the influence of added functionalities in comparison to the performance of basic model. With this model we successfully tested and analysed the introduction of new service Video on demand in the network of Telekom Slovenia. For company Telsima we upgraded the simulation model in this way, that it is possible to analyse the influence of traffic parameters on the throughput of the mobile WiMAX network.
F.17 Transfer of existing technologies, know-how, methods and procedures into practice
COBISS.SI-ID: 22829351Within the FP6 project SatNEx we participated in the investigation of a hybrid stratospheric satellite communication system. We studied adaptive modulation procedures. In particular, we analysed standard block and advanced iterative decoding algorithms. We also contributed to the development of communication system for public protection and disaster relief, integrating various local area communication technologies such as ad hoc networks and professional digital trunked radio, potentially deployed in remote and damaged areas in the case of emergency situations.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 23274791In the paper we publishe the research results of the attenuation measurements for TETRA system in two lane road tunnel. Based on measurements we proposed new channel model consisting of four regions, namely free space region, near region, far region and extremely far region. Dominant phenomena are identified for every region and heuristic explanation of the propagation in each region is given. The channel model can be applied for coverage prediction of direct mode operation in TETRA systems.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 22432551We designed flexible wireless sensor node for the development of sensor networks and evaluation of their performance. The node supports access to different analog and digital sensor elements and application of different protocols for the communication between sensor nodes. We developed a sensor node and accompanying Java application in order to transmit and store measured data on a mobile user device. We are now adapting sensor nodes to the environmental monitoring applications.
F.08 Development and manufacture of a prototype
COBISS.SI-ID: 23420711