Sensors 2012, 12(11), 15292-15307; doi:10.3390/s121115292
Article

A Modular Spectrum Sensing System Based on PSO-SVM

Received: 15 August 2012; in revised form: 5 November 2012 / Accepted: 5 November 2012 / Published: 8 November 2012
(This article belongs to the Section Physical Sensors)
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.
Abstract: In the cognitive radio system, spectrum sensing for detecting the presence of primary users in a licensed spectrum is a fundamental problem. Energy detection is the most popular spectrum sensing scheme used to differentiate the case where the primary user’s signal is present from the case where there is only noise. In fact, the nature of spectrum sensing can be taken as a binary classification problem, and energy detection is a linear classifier. If the signal-to-noise ratio (SNR) of the received signal is low, and the number of received signal samples for sensing is small, the binary classification problem is linearly inseparable. In this situation the performance of energy detection will decrease seriously. In this paper, a novel approach for obtaining a nonlinear threshold based on support vector machine with particle swarm optimization (PSO-SVM) to replace the linear threshold used in traditional energy detection is proposed. Simulations demonstrate that the performance of the proposed algorithm is much better than that of traditional energy detection.
Keywords: cognitive radio; spectrum sensing; PSO-SVM; detection threshold
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MDPI and ACS Style

Cai, Z.; Zhao, H.; Yang, Z.; Mo, Y. A Modular Spectrum Sensing System Based on PSO-SVM. Sensors 2012, 12, 15292-15307.

AMA Style

Cai Z, Zhao H, Yang Z, Mo Y. A Modular Spectrum Sensing System Based on PSO-SVM. Sensors. 2012; 12(11):15292-15307.

Chicago/Turabian Style

Cai, Zhuoran; Zhao, Honglin; Yang, Zhutian; Mo, Yun. 2012. "A Modular Spectrum Sensing System Based on PSO-SVM." Sensors 12, no. 11: 15292-15307.

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