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Sensors 2016, 16(12), 1999; doi:10.3390/s16121999

Mitigating RF Front-End Nonlinearity of Sensor Nodes to Enhance Spectrum Sensing

School of Electronic Information and Communications, Huazhong University of Science & Technology, Wuhan 430074, China
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Author to whom correspondence should be addressed.
Academic Editors: Ferran Martín and Jordi Naqui
Received: 1 August 2016 / Revised: 7 November 2016 / Accepted: 10 November 2016 / Published: 25 November 2016
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Abstract

The cognitive radio wireless sensor network (CR-WSN) has gained worldwide attention in recent years for its potential applications. Reliable spectrum sensing is the premise for opportunistic access to sensor nodes. However, as a result of the radio frequency (RF) front-end nonlinearity of sensor nodes, distortion products can easily degrade the spectrum sensing performance by causing false alarms and degrading the detection probability. Given the limitations of the widely-used adaptive interference cancellation (AIC) algorithm, this paper develops several details to avoid these limitations and form a new mitigation architecture to alleviate nonlinear distortions. To demonstrate the efficiency of the proposed algorithm, verification tests for both simulations and actual RF front-end measurements are presented and discussed. The obtained results show that distortions can be suppressed significantly, thus improving the reliability of spectrum sensing. Moreover, compared to AIC, the proposed algorithm clearly shows better performance, especially at the band edges of the interferer signal. View Full-Text
Keywords: cognitive radio wireless sensor network (CR-WSN); spectrum sensing; nonlinear distortion; singular value decomposition (SVD); adaptive interference cancellation (AIC) cognitive radio wireless sensor network (CR-WSN); spectrum sensing; nonlinear distortion; singular value decomposition (SVD); adaptive interference cancellation (AIC)
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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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Hu, L.; Ma, H.; Zhang, H.; Zhao, W. Mitigating RF Front-End Nonlinearity of Sensor Nodes to Enhance Spectrum Sensing. Sensors 2016, 16, 1999.

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