Optimal Deployment of Base Stations in Cognitive Satellite-Terrestrial Networks

Abstract

We investigate the performance of a downlink multibeam cognitive satellite terrestrial network (CSTN) in which a secondary network (mobile terrestrial system) shares resources with a primary satellite network given that the interference temperature constraint is satisfied. Utilising tools from stochastic geometry, we derive the closed-form optimal density of base stations subject to interference temperature and outage probability constraints set by satellite system. In addition, the gains of directional beamforming are analysed when the terrestrial system employs multiple-input-multiple-output (MIMO) transceivers or by the use of millimeter wave links between terrestrial BSs and users.