ED-Based Spectrum Sensing for the Satellite Communication Networks Using Phased-Array Antennas

Spectrum sensing is of crucial importance in the satellite communication networks to address the increasingly severe spectrum scarcity problem. However, most of the spectrum sensing schemes for detecting satellite signal use the traditional reflector antennas and have poor performance, especially under the low signal-to-noise ratio (SNR). To tackle this issue, an energy detection (ED)-based spectrum sensing scheme is proposed by using the phased-array antennas (PAAs) for the satellite communication networks. Moreover, the closed-form expressions for the false alarm probability and detection probability considering the visibility of satellite-to-ground links are derived. Simulation results verify our theoretical analysis and demonstrate the superiority of our proposed scheme compared with the schemes that do not consider the spatial condition.