Abstract
In the existing scenario, the radio spectrum is allocated and divided between unlicensed and licensed frequencies. Due to this policy, some portions of the spectrum remain unused. To cope with this situation, a new communication paradigm is introduced, known as Cognitive Radio (CR). One of the main challenges in Cognitive Radio Network (CRN) is the sharing of spectrum. Spectrum sharing allows several CR nodes for transmission by using vacant spectrum resources. It can be conducted in both distributed and centralized environment. Centralized spectrum sharing can be impractical with the severe increase in spectrum demand. But distributed spectrum sharing along with consumer devices having Cognitive Radio capabilities, provides a realistic spectrum sharing solution. There are three spectrum sharing techniques in dynamic spectrum access (DSA), i.e., underlay, overlay and interweave. Major spectrum sharing challenges are: Common Control Channel and Dynamic Radio Range. There are many other challenging issues still need additional investigations, thus, making Cognitive Radio an open research area. In this chapter, we present a detail survey on different spectrum sharing techniques in CRN. This chapter also presents different performance evaluation parameters to ensure the quality of the spectrum sharing technique. At last it presents various challenges and issues associated with spectrum sharing and the future research opportunities in this area. This will present a clear vision to the young researchers to carry out their research in this domain by knowing the future scope from it.
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Mishra, S., Singh, S.S., Mishra, B.S.P. (2019). A Comparative Analysis of Centralized and Distributed Spectrum Sharing Techniques in Cognitive Radio. In: Mishra, B., Dehuri, S., Panigrahi, B., Nayak, A., Mishra, B., Das, H. (eds) Computational Intelligence in Sensor Networks. Studies in Computational Intelligence, vol 776. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-57277-1_19
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