ANALYSIS OF SATELLITE BROADCASTING SYSTEMS FOR DIGITAL TELEVISION

This paper introduces the new concept of digital direct satellite broa dcasting (D-DBS), which allows unprecedented flexibility by providing a large number of audio-visual services. The concept elaborated on in this paper assumes an information rate of about 40 Mb/s, which is comp atible with practically all present-day transponders. After discussion of the general system concept, the optimization procedure is introduc ed and results of the transmission system optimization are presented. Channel distortion and uplink/downlink interference effects are taken into account by means of a time domain system computer simulation appr oach. It is shown, by means of link budget analysis, how a medium powe r direct-to-home TV satellite can provide multimedia services to users equipped with small (60 cm) dish antennas.