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Sensors 2015, 15(7), 16105-16135; doi:10.3390/s150716105

SNR Wall Effect Alleviation by Generalized Detector Employed in Cognitive Radio Networks

School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 8 April 2015 / Revised: 18 May 2015 / Accepted: 18 June 2015 / Published: 3 July 2015
(This article belongs to the Section Remote Sensors)
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Abstract

The most commonly used spectrum sensing techniques in cognitive radio (CR) networks, such as the energy detector (ED), matched filter (MF), and others, suffer from the noise uncertainty and signal-to-noise ratio (SNR) wall phenomenon. These detectors cannot achieve the required signal detection performance regardless of the sensing time. In this paper, we explore a signal processing scheme, namely, the generalized detector (GD) constructed based on the generalized approach to signal processing (GASP) in noise, in spectrum sensing of CR network based on antenna array with the purpose to alleviate the SNR wall problem and improve the signal detection robustness under the low SNR. The simulation results confirm our theoretical issues and effectiveness of GD implementation in CR networks based on antenna array. View Full-Text
Keywords: cognitive radio (CR); spectrum sensing; generalized detector (GD); energy detector (ED); noise uncertainty; sample complexity; antenna array; SNR wall cognitive radio (CR); spectrum sensing; generalized detector (GD); energy detector (ED); noise uncertainty; sample complexity; antenna array; SNR wall
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Shbat, M.S.; Tuzlukov, V. SNR Wall Effect Alleviation by Generalized Detector Employed in Cognitive Radio Networks. Sensors 2015, 15, 16105-16135.

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