RFI Issue and Spectrum Sharing Paradigm for Future Satellite Communication and Radio Astronomy Systems

Wireless services, which utilize radio spectrum resources, can be classified into two types: passive wireless services and active wireless services. Some passive wireless services (e.g., Radio Astronomy System (RAS)) are extremely vulnerable to the interference from active wireless services. In addition, the widely-distributed radio astronomical signals in the spectrum drive the radio astronomers seeking for opportunities to observe in the bands which have been assigned to active wireless systems for primary use. In view of the conflict between the RAS and other active wireless systems, this dissertation focuses on the spectrum sharing paradigm between the two sides which can bring benefits to both sides and thus achieve a harmonious utilization of the spectrum resource. First, we investigate and develop a spectrum sharing paradigm between the RAS and the Geostationary Orbit (GSO) Satellite Communication Systems (SCSs). Via utilizing the idle RAS band(s), the proposed paradigm can bring more throughput/capacity to SCS side while reducing Radio Frequency Interference (RFI) and offering more observation opportunities to RAS side. Next, we propose a new paradigm where SCS and RAS are integrated into the Non-Geostationary Orbit (NGSO) satellite system, thus effectively creating large-scale telescopes in orbit. This integrated system not only avoids SCS’s RFI to RAS but also offers more spectrum access opportunities to both SCS and RAS. The proposed paradigm several additional advantages in terms of accessible spectrum bands, RAS observation performance, and SCS maximum mean supportable data rate as well as enabling coexistence and growths of both types of services