The use of big LEO satellite systems and EUREKA 147 DAB to provide reliable BC reception

A LEO broadcasting satellite system for EUREKA 147-DAB is discussed and analyzed. It can provide a continuous, worldwide service, which is not interrupted by satellite handovers. A complete S-DAB service is provided by overlapping cellular service areas. Each cell may have an individual uplink station without any sophisticated components. The system analysis indicates that the link margin of the proposed system can overcome the problems of blockage and foliage attenuation, which are significant in the alternative GEO/HEO systems. The analysis also reveals that the specifications of the EUREKA DAB COFDM signal are adequate to cope with range and range rate effects due to the satellite motion. The system concept is based on the exploitation of range, range rate, and angular information onboard the satellites with respect to each individual uplink station in order to compensate for Doppler frequency shifts and for variable signal propagation delay.