Journal
SENSORS
Volume 15, Issue 7, Pages 16105-16135Publisher
MDPI
DOI: 10.3390/s150716105
Keywords
cognitive radio (CR); spectrum sensing; generalized detector (GD); energy detector (ED); noise uncertainty; sample complexity; antenna array; SNR wall
Funding
- Kyungpook National University
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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.
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