Cooperative spectrum sensing using enhanced dempster-shafer theory of evidence in cognitive radio

Authors:
Nguyen-Thanh Nhan;Xuan Thuc Kieu;Insoo Koo
Affiliations:
School of Electrical Engineering, University of Ulsan, Ulsan, Republic of Korea;School of Electrical Engineering, University of Ulsan, Ulsan, Republic of Korea;School of Electrical Engineering, University of Ulsan, Ulsan, Republic of Korea
Venue:
ICIC'09 Proceedings of the Intelligent computing 5th international conference on Emerging intelligent computing technology and applications
Year:
2009

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Abstract

Cooperative is an appropriate method for improving the performance of spectrum sensing when cognitive radio system is under the deep shadowing and fading environment. The Dempster-Shafer theory of evidence for fusion has similar reasoning logic with human. Thus an enhanced scheme for cooperative spectrum sensing based on an enhanced Dempster-Shafer Theory of Evidence is proposed in this paper. Our scheme utilizes the signal to noise ratios to evaluate the degree of reliability of each local spectrum sensing terminal on a distributed Cognitive Radio network to adjust the sensing data more accuratly before making fusion by Dempter-Shafer theory of evidence. Simulation results show that significant improvement of the cooperative spectrum sensing gain is achieved.