scholarly journals Proactive and Reactive DF Relaying for Cognitive Network with Multiple Primary Users

2016 ◽  
Vol 25 (3) ◽  
pp. 474-481 ◽  
Author(s):  
C. K. De ◽  
S. Kundu
Keyword(s):  
Cognitive Network ◽  
Primary Users ◽  
Multiple Primary ◽  
Multiple Primary Users

Performance analysis of an opportunistic multi-user cognitive network with multiple primary users

2014 ◽  
Vol 15 (16) ◽  
pp. 2004-2019 ◽  
Author(s):  
Fahd Ahmed Khan ◽  
Kamel Tourki ◽  
Mohamed-Slim Alouini ◽  
Khalid A. Qaraqe
Keyword(s):  
Performance Analysis ◽  
Cognitive Network ◽  
Primary Users ◽  
Multiple Primary ◽  
Multiple Primary Users

scholarly journals A Novel Multiband Spectrum Sensing Method Based on Wavelets and the Higuchi Fractal Dimension

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1322 ◽  
Author(s):  
Yanqueleth Molina-Tenorio ◽  
Alfonso Prieto-Guerrero ◽  
Rafael Aguilar-Gonzalez
Keyword(s):  
Fractal Dimension ◽  
Spectrum Sensing ◽  
Cognitive Radios ◽  
Primary User ◽  
Linear Measure ◽  
Signal To Noise ◽  
Primary Users ◽  
Multiple Primary ◽  
Higuchi Fractal Dimension ◽  
Multiple Primary Users

In this work, two novel methodologies for the multiband spectrum sensing in cognitive radios are implemented. Methods are based on the continuous wavelet transform (CWT) and the multiresolution analysis (MRA) to detect the edges of available holes in the considered wideband spectrum. Besides, MRA is also combined with the Higuchi fractal dimension (a non-linear measure) to establish the decision rule permitting the detection of the absence or presence of one or multiple primary users in the studied wideband spectrum. Methods were tested on simulated and real signals showing a good performance. The results present these two methods as effective options for detecting primary user activity on the multiband spectrum. The first methodology works for 95% of cases, while the second one presents 98% of effectivity under simulated signals of signal-to-noise ratios (SNR) higher than 0 dB.

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