An Improved Combining of Hard Decisions for Cooperative Spectrum Sensing in Cognitive Radio Systems 


Vol. 34,  No. 2, pp. 132-138, Feb.  2009


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  Abstract

Cognitive radio is considered as a promising solution to scarce spectrum problem. The primary object of cognitive radio is to increase spectral efficiency, while causing limited interference to primary users who are using the spectrum. Hence, an essential part of cognitive radio systems is spectrum sensing which determines whether a particular spectrum is occupied or not by a primary user at a particular time. However, sensing decision of each individual secondary user alone may not be reliable enough due to shadowing and multipath fading of wireless channels. The so called hidden terminal problem makes the problem even worse, possibly yielding undesired interference to the primary users. Recently, cooperative spectrum sensing is emerging as a remedy to these problems of individual sensing. Cooperative sensing allows a group of secondary users to share local sensing information to extract a global decision with high fidelity. In this paper, we investigate a cooperative spectrum sensing algorithm based on hard decisions of local sensing outcomes. Specifically, we propose an effective scheme for combining local decisions by introducing weighting factors that reflect reliability of the corresponding secondary user. Through computer simulations, the performance of the proposed combining scheme is compared with that of the conventional scheme without weighting factors in various environments.

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  Cite this article

[IEEE Style]

O. Shin and Y. Shin, "An Improved Combining of Hard Decisions for Cooperative Spectrum Sensing in Cognitive Radio Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 2, pp. 132-138, 2009. DOI: .

[ACM Style]

Oh-Soon Shin and Yoan Shin. 2009. An Improved Combining of Hard Decisions for Cooperative Spectrum Sensing in Cognitive Radio Systems. The Journal of Korean Institute of Communications and Information Sciences, 34, 2, (2009), 132-138. DOI: .

[KICS Style]

Oh-Soon Shin and Yoan Shin, "An Improved Combining of Hard Decisions for Cooperative Spectrum Sensing in Cognitive Radio Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 2, pp. 132-138, 2. 2009.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880