Cel The Universal Mobile Telecommunication System (UMTS) is an integrated satellite and and mobile system (SALMS) that will offer services up to 2 Mb/s per bearer. This third generation communication system is subjected to standardization by the Special Mobile Group (SMG) of ETSI. The UMTS standard may comply with the world wide standard for FPLMTS developed by the International Telecommunication Union. The objective of project is to identify and study different possible integration scenarios between terrestrial and satellite mobile networks in the context of third generation systems offering services in different environments, supporting different terminal types and providing world-wide interpretability and roaming of UMTS users. Offering multiple high quality services (teleworking, multi-media, paging, etc ...) requires advanced communication and network management techniques optimized for a common land and satellite mobile channel. In this project, these two research topics are addressed: Communication techniques and network modelling are two key issues that need to be investigated as they give rise to the specification of the lower level layers of the system. Proper definition of these layers should enable the development of a broad range of information services in this universal network. A major problem in defining a fully integrated satellite - land mobile system is caused by the difference between the two used channels characteristics (the satellite-to-mobile terminal link and the terrestrial base station-to-mobile terminal link). Efficient techniques for data transmission of information over the satellite and terrestrial channel have to be constructed. This includes the use of modulation techniques useful for both channel characteristics. Continuous phase modulation (CPM) will be considered. It is characterized by having a constant envelope. It is spectrally efficient and insensitive to non-linear distortion introduced by power amplifiers (e.g. TWT in satellite). The performance of this modulation technique will be compared with other (linear) modulation schemes. Equalization and channel coding (in combination with the used modulation method) will be incorporated to provide a communication link quality insensitive to the dispersive (both time and frequency) nature of the channel characteristic. The frequency-selective fading channel introduces inter-symbol-interference (ISI). Various equalizer structures exist according to the criterion used to minimize the effect of the time-varying dispersive channel (MMSE-DFE,MMSE-LE,RLS,blind equalizer,..). The performance of the different equalizers structures will be evaluated. The computational complexity of each algorithm has to be taken into account in order to be able to realize a low cost, small portable transceiver. The optimal receiver has to extract carrier and symbol timing from the received distorted useful signal in order to obtain a good estimate of the transmitted information symbols. Carrier and symbol timing can be retrieved either by use of the estimated received symbols (decision-directed) or non-decision directed. Performance and complexity of the different synchronization structures should be compared. Efficient receiver synchronization structures will be developed. The network aspect for the SALMS includes overload-handling and channel allocation strategies taking into account the different nature of services (plain data, voice, or image) that will be offered by a SALMS. The future SALMS network architecture will be studied. Program(-y) IC-PECO/COPERNICUS - Scientific and technological cooperation between the European Community and European non-member countries, 1992- Temat(-y) Data not available Zaproszenie do składania wniosków Data not available System finansowania CSC - Cost-sharing contracts Koordynator University of Ghent Wkład UE Brak danych Adres St. Pietersnieuwstraat 41 9000 Ghent Belgia Zobacz na mapie Koszt całkowity Brak danych Uczestnicy (6) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko Czech Technical University in Prague Czechy Wkład UE Brak danych Adres Zobacz na mapie Koszt całkowity Brak danych E F P Polska Wkład UE Brak danych Adres Zobacz na mapie Koszt całkowity Brak danych Inventel CO LTD Polska Wkład UE Brak danych Adres Zobacz na mapie Koszt całkowity Brak danych Iskra Telemobil Słowenia Wkład UE Brak danych Adres Zobacz na mapie Koszt całkowity Brak danych Jozef Stefan Institute Słowenia Wkład UE Brak danych Adres Zobacz na mapie Koszt całkowity Brak danych Société Anonyme de Télécommunications (SAT) Francja Wkład UE Brak danych Adres Zobacz na mapie Koszt całkowity Brak danych
