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Sensors 2015, 15(2), 4388-4407; doi:10.3390/s150204388

A Soft-Hard Combination-Based Cooperative Spectrum Sensing Scheme for Cognitive Radio Networks

1
Department of Electronic & Computer Engineering in Graduate School, Hongik University, Sejong 339-701, Korea
2
Department of Computer & Information Communications Engineering, Hongik University, Sejong 339-701, Korea
*
Author to whom correspondence should be addressed.
Received: 5 November 2014 / Revised: 21 January 2015 / Accepted: 10 February 2015 / Published: 13 February 2015
(This article belongs to the Special Issue Wireless Sensor Networks and the Internet of Things)
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Abstract

In this paper we propose a soft-hard combination scheme, called SHC scheme, for cooperative spectrum sensing in cognitive radio networks. The SHC scheme deploys a cluster based network in which Likelihood Ratio Test (LRT)-based soft combination is applied at each cluster, and weighted decision fusion rule-based hard combination is utilized at the fusion center. The novelties of the SHC scheme are as follows: the structure of the SHC scheme reduces the complexity of cooperative detection which is an inherent limitation of soft combination schemes. By using the LRT, we can detect primary signals in a low signal-to-noise ratio regime (around an average of −15 dB). In addition, the computational complexity of the LRT is reduced since we derive the closed-form expression of the probability density function of LRT value. The SHC scheme also takes into account the different effects of large scale fading on different users in the wide area network. The simulation results show that the SHC scheme not only provides the better sensing performance compared to the conventional hard combination schemes, but also reduces sensing overhead in terms of reporting time compared to the conventional soft combination scheme using the LRT. View Full-Text
Keywords: cognitive radio; spectrum sensing; soft combination; hard combination; likelihood ratio test; weighted decision cognitive radio; spectrum sensing; soft combination; hard combination; likelihood ratio test; weighted decision
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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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Do, N.T.; An, B. A Soft-Hard Combination-Based Cooperative Spectrum Sensing Scheme for Cognitive Radio Networks. Sensors 2015, 15, 4388-4407.

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