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2012 (Vol. 4, Issue: 21)
Article Information:

A Novel Spectrum Detection Scheme Based on Dynamic Threshold in Cognitive Radio Systems

Guicai Yu, Chengzhi Long and Mantian Xiang
Corresponding Author:  Guicai Yu 

Key words:  Cognitive radio , dynamic threshold, energy detection, matched filter detection, noise uncertainty, ,
Vol. 4 , (21): 4245-4251
Submitted Accepted Published
December 20, 2011 April 23, 2012 November 01, 2012
Abstract:

In cognitive radio networks, nodes should have the capability to decide whether a signal from a primary transmitter is locally present or not in a certain spectrum in short detection period. This study presents a new spectrum detection algorithm based on dynamic threshold. Spectrum detection schemes based on fixed threshold are sensitive to noise uncertainty, the proposed scheme can improve the antagonism of noise uncertainty, get a good performance of detection while without increasing the computer complexity. However, for schemes which are not sensitive to noise uncertainty, the proposed scheme, in essence, did not improve the detection performance. Computer simulation results show that the proposed algorithm enhances the robust of anti-noise uncertainty and improves detection performance for schemes are sensitive to noise uncertainty in lower signal-to-noise-ratio and large noise uncertainty environments, but not help to schemes which are not sensitive to noise uncertainty.
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  Cite this Reference:
Guicai Yu, Chengzhi Long and Mantian Xiang, 2012. A Novel Spectrum Detection Scheme Based on Dynamic Threshold in Cognitive Radio Systems.  Research Journal of Applied Sciences, Engineering and Technology, 4(21): 4245-4251.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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