A Probabilistic Model of Spectrum Availability for OFDMA Based Cognitive Radio Systems

In this paper, the demands made by a set of spatially Poisson point distributed primary users on available channels in their proximity is considered and their effect on channel availability for secondary users under various channel requesting distributions is assessed. It is shown that for some &quo...

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Bibliographic Details
Published in:IEEE communications letters 2012-11, Vol.16 (11), p.1780-1783
Main Authors: Rahimian, N., Celebi, H., Georghiades, C. N., Qaraqe, K. A.
Format: Article
Language:English
Subjects:
Applied sciences
Availability
Channels
Cognitive radio
Computers
Exact sciences and technology
Information, signal and communications theory
Marketing
Multiplexing
Networks
Numerical models
OFDMA
Outages
Probabilistic logic
probabilistic model
Probability theory
Radiocommunication specific techniques
Radiocommunications
Random variables
Signal and communications theory
spectrum availability
Subcarriers
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Upper bound
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Description
Summary:In this paper, the demands made by a set of spatially Poisson point distributed primary users on available channels in their proximity is considered and their effect on channel availability for secondary users under various channel requesting distributions is assessed. It is shown that for some "greedy" systems, providing more subcarriers will not increase the spectrum availability for a secondary network. The sustainable traffic of the system subject to a fixed spectrum outage probability is also investigated. It is shown that for a fixed spectrum outage probability, as long as the system is "greedy", providing more subcarriers does not help to support more primary users to successfully avoid spectrum outage.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2012.091712.121462