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

Author

Rahimian, Nariman ; Celebi, Haluk ; Georghiades, Costas N. ; Qaraqe, Khalid A.

Author_Institution

Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX, USA

Volume

16

Issue

11

fYear

2012

fDate

11/1/2012 12:00:00 AM

Firstpage

1780

Lastpage

1783

Abstract

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.

Keywords

OFDM modulation; cognitive radio; frequency division multiple access; sustainable development; wireless channels; OFDMA-based cognitive radio systems; channel availability; channel requesting distributions; fixed spectrum outage probability; greedy systems; probabilistic model; secondary network; secondary users; spatially Poisson point distributed primary users; spectrum availability; sustainable system traffic; Availability; Cognitive radio; Computers; Numerical models; Probabilistic logic; Random variables; Upper bound; Cognitive radio; OFDMA; probabilistic model; spectrum availability;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2012.091712.121462

Filename

6313577