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Flexible Spectrum Access for Opportunistic Secondary Operation in Cognitive Radio Networks

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4 Author(s)
Gelabert, X. ; Dept. of Signal Theor. & Commun. (TSC), Univ. Politec. de Catalunya (UPC), Barcelona, Spain ; Sallent, O. ; Perez-Romero, J. ; Agusti, R.

In this letter a Discrete-Time Markov Chain (DTMC) framework is adopted to capture the effect of flexible spectrum channelization for the opportunistic access of secondary users (SUs) in a primary-secondary shared spectrum scenario. Two implementation alternatives are proposed: a fixed channelization scheme (FCS) and an adaptive channelization scheme (ACS). Moreover, service-type characterization of SUs is also addressed by defining time vs. volume based services. Results indicate the suitability of the ACS over the FCS.

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Communications, IEEE Transactions on  (Volume:59 ,  Issue: 10 )