A PFD trigger threshold for the co-ordination of BSS(S) and point-to-multipoint terrestrial systems

The International Telecommunications Union (ITU) has allocated the frequency band 1452-1492 MHz to the Broadcast Satellite Service Sound, BSS(S), on a shared basis with existing terrestrial services. In order to cover the largest possible area, the BSS(S) providers require as high a power flux density (PFD) as possible. The terrestrial fixed service on the other hand requires a level below which harmful interference will not be caused. A particularly sensitive terrestrial system is the point-to-multipoint digital radio concentrator system (DRCS) used in Australia and many other parts of the world to service rural and remote areas. A probabalistic method for the determination of a PFD trigger threshold is presented along with a recommended PFD trigger level for the co-ordination of the BSS(S) with terrestrial DRCS.