Software Defined Radio (SDR) and Cognitive Radio (CR) are promising technologies, which
can be used to alleviate the spectrum shortage problem or the barriers to communication …

This survey paper discusses the feasibility of sharing the spectrum between satellite
telecommunication networks and terrestrial and other satellite networks on the basis of a …

Cognitive radio systems necessitate the incorporation of cooperative spectrum sensing
among cognitive users to increase the reliability of detection. We have found that …

There is a rapid development in wireless technologies with the increase of congestible
frequency spectrums, research study reveals that there is a problem in spectrum …

Cognitive radio has attracted considerable attention because of its ability to make full use of
the available spectrum resources for wireless terrestrial communication networks. In …

Applicability of cognitive radio (CR) techniques to satellite communications is investigated
and classification for the possible applications is foreseen in this paper. The proposed …

The present scarcity of frequency spectrum allocated to radio communications has motivated
the search for technologies able to alleviate it by adapting the transmission to changing …

As the increasing of both users' demand and the number of communication satellites,
spectrum resource is becoming increasingly scarce. Cognitive radio (CR) can effectively …

Secondary use of the satellite spectrum by a terrestrial system is studied in this paper,
focusing on broadcasting satellite services. Both spectrum sensing based access and …

In this chapter, we review principles of hybrid radio access systems that are able to provide
both terrestrial and satellite connectivity. Practical examples of the existing hybrid systems …