Implementation of Prototype Building Blocks for Value Added Services (VAS) in a Digital Broadcasting Standard Final report

Abstract

DDB (Digital Data Broadcasting) is an extension of the already existing progressive DAB broadcasting system. It is based on the standard, which has been elaborated within the europroject EUREKA147 and it opens up a wide range of value added data services. New services, which have not been possible in previous broadcasting systems, are to increase the acceptance of the new system in order to make possible a wide introduction of DAB in the future. Therefore it is essential to make DAB receivers available both at high quantities and at reasonable prices. The realization of combined audio-data receivers is only practicable by use of highly integrated, application specific, monolithically integrated circuits (ASICs). This is due to the fact that the DAD/DDB techniques apply highly sophisticated real time algorithms. Furthermore the tasks which have to be done within the project are of such extent and of such various kind, that they are only practicable in a consortium project. Within this consortium project the already manufactured test ASICs have been developed on with regard to even higher functionality, realized, and tested. In the analog part of the receiver the integrated bipolar circuits have been extended by additional functionality. Investigations with regard to an integration by use of gallium arsenide technology gave promising results. The digital signal processing algorithms have been accelerated by means of new architectures and extensions of the circuitry and have been adopted to the required higher data rates. The implementation of the data decoder as a program running on a signalprocessor offers high flexibility with respect to adaptation and expansion. Regarding the transmitter, investigations and computer simulations for the linearization of power amplifiers have been carried out in order to reach optimal usage of the limited frequency resources. The work carried out and its results are one step more paving the way to realize small size and low power DAB receivers. (orig.)Available from TIB Hannover: F98B90+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman