GENERAL COMPUTATION METHOD OF OUTAGE TIME FOR DIGITAL RADIO LINKS

A method to compute outage time during clear air conditions on any rad io path for various types of digital modulation is proposed. The perfo rmance of digital systems depends on combined effects of in-band ampli tude dispersion (IBAD) in the channel bandwidth, and of carrier to noi se ratio (CNR). Outage time is then computed for a given period using the statistical dependence of IBAD and CNR in the propagation mechanis ms occurring on the path and using the formal relation of IBAD with CN R characterising the digital equipment in service.