A Cognitive Radio Spectrum Handoff Schemes Based On Spectrum Sensing
A Comprehensive Survey
Wireless communication techniques have gained popularity in the recent decade, wireless networks, at present, follow the technology of fixed spectrum allocation. This technique, in which spectrum bands are licensed by government agencies, follows the geographical division of regions and static access of the spectrum. Which limits the available spectrum causing in-efficiency; therefore we require a common method which can be applied to all network devices for optimal use of spectrum i.e. cognitive radios. Cognitive radio accesses the spectrum dynamically, which provides opportunistic spectrum access. There are many design issues and challenges in using CR network because of variable structure and quality of services. One such issue is spectrum handoff. Although there are many techniques by which a spectrum can be accessed by a user, in this paper spectrum handoff by spectrum sensing is discussed. There are three major methods to accomplish this handoff process which has been analyzed and compared, to provide a better scope for researchers physically implementing cognitive radios. This paper provides a comprehensive and brief survey on the cognitive radio spectrum handoff schemes based on spectrum sensing.
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