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The increasing demand for capacity in order to provide high data rate multimedia services in wireless environments necessitates enhanced radio transmission techniques and network protocol functionality. Such techniques have to be added to already existing mobile cellular networks, e.g. as provided by EDGE. For 3 rd generation UMTS networks based on WCDMA,(More)
—This paper presents system design, communication concept and performance studies of an innovative secure and reliable communication system for Emergency Medical Services (EMS). This work is based on the research projects Med-on-@ix and its successor TemRas. The main objective of both projects is the development and deployment of a system concept for(More)
Wireless last mile technology is becoming a challenging competitor to conventional wired last mile access systems like DSL and cable modems or even fiber-optic cables. The European Telecommunications Standards Institute (ETSI) and the Institute of Electrical and Electronics Engineers (IEEE) have lately developed a new standard for fixed broadband wireless(More)
The CDMA based UMTS transmission technology in which all users simultaneously share the same common range of spectrum gets rather affected by system interference. The reduction of interference is therefore a key issue in the development of optimal radio transmission in order to increase system capacity. Power control is a well-known technology to improve(More)
—Advanced antenna technologies and algorithms have been developed during the last years. But until today, advanced antenna algorithms of the physical layer and the modes of operation of medium access layers have not been integrated in modern wireless systems. This paper outlines the support of space division multiple access techniques by the wireless(More)