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Spectrum sharing in cognitive radio networks

Ahmed, Waqas (2012) Spectrum sharing in cognitive radio networks. PhD thesis, Victoria University.

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Abstract

Years of growth in wireless communication services and conservative spectrum allocation policies by government regulators have led to spectrum scarcity. On the other hand, spectrum measurement campaigns have indicated that the actual occupancy of most licensed frequency bands is quite low. In recent years, Cognitive radio has emerged as a promising solution to increase spectrum occupancy and tackle spectrum scarcity. Cognitive radio enables the unlicensed (secondary) user to establish a communication link in licensed spectrum on the condition that there is no or minimal interference to the licensee (primary user). In this thesis, the two main facets of spectrum sharing in cognitive radio networks are investigated; interweave access and underlay access. The former is an orthogonal scheme, where the secondary user only transmits in white space (idle primary user spectrum). The latter is a shared scheme in which concurrent primary and secondary transmission is allowed, subject to any co-channel interference at the primary being below an acceptable limit.

Item Type: Thesis (PhD thesis)
Uncontrolled Keywords: spectrum occupancy, interference, CR, spectrum access, optimal channel reservation, forced termination probability, blocking probability, channel reservation, Markov model
Subjects: FOR Classification > 1005 Communications Technologies
Faculty/School/Research Centre/Department > Centre for Telecommunications and Micro-Electronics (CTME)
Depositing User: VU Library
Date Deposited: 27 Jun 2012 03:00
Last Modified: 23 May 2013 16:59
URI: http://vuir.vu.edu.au/id/eprint/19942
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