Aeronautical Communication Systems as Potential Primary Users in Secondary Spectrum Access
Secondary spectrum access emerges as a means to increase spectrum utilization significantly in a near future. However, the technical availability and the economic value of the secondary access have not been fully investigated. Particularly, the impact of the secondary access on the real-life primary systems remains mostly unaddressed. Among the primary systems of interest are aeronautical communication systems operating in the radio frequencies under 6 GHz. In this paper, the authors present an overview of various aeronautical communication systems as the potential primary users.