Study of Spectrum Sensing Techniques in Cognitive Radio: A Survey
Kanwaljeet Singh1, Avtar Singh Buttar2
1Kanwaljeet Singh, Department of Electronics and Communication Engineering, Punjab Technical University, Jalandhar-Kapurthala Highway, India.
2Avtar Singh Buttar, Department of Electronics and Communication Engineering, Punjab Technical University, Jalandhar-Kapurthala Highway, India.
Manuscript received on June 15, 2015. | Revised Manuscript received on June 27, 2015. | Manuscript published on July 05, 2015. | PP: 97-100 | Volume-5 Issue-3, July 2015. | Retrieval Number: C2661075315/2015©BEIESP
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©The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract: The wireless traffic is increasing in an unparalleled way, which causes radio spectrum shortage. The fixed spectrum assignment policy makes this problem more critical. Cognitive radio is one answer to spectrum scarcity problem. In Cognitive radio, the licensed bands are opportunistically accessed when primary user is absent. The first step to a cognitive radio network is the spectrum sensing. An efficient and fast spectrum sensing can make cognitive radio more useful practically. In this paper we discuss several spectrum sensing techniques used in cognitive radio. The vacant frequency spectrum is first sensed by the cognitive radio users, for this purpose several spectrum sensing techniques are used. Spectrum sensing is one of the features of cognitive radio which tells us the availability of vacant bands (also called spectrum holes). In this survey, we analyze the non-cooperative, cooperative and interference based spectrum sensing techniques in cognitive radio. Also in the last, an introduction of some miscellaneous techniques has been given.
Keywords: Cognitive Radio (CR), spectrum sensing, Primary User (PU), fusion center, multi-taper spectrum estimation, Power Spectral Density (PSD).