Abstract:

In order to improve the spectrum usage of the up-band of fixed satellite service (FSS), an unlicensed access scheme is presented. The satellite’s idle channel is used for cognitive radio service channel, and a common coordinate channel with lower transmitting power and better anti-jamming ability is proposed. The two basic unlicensed access modes, Ad hoc and star mode, are considered. According to interference temperature, the interference of the cognitive radios to satellite receiver is analyzed. Analysis and simulation results show that, by using this scheme to avoid interference to satellite receiver with the jam-probability lower than 1%, many cognitive radios can access the band without special authorization.

Key words:

cognitive radio, fixed satellite service, unlicensed access, dynamical frequency selection, interference temperature