Acta Metallurgica Sinica(English letters) ›› 2010, Vol. 17 ›› Issue (2): 1-7.doi: 10.1016/S1005-8885(09)60437-4

• Wireless •     Next Articles

SNR-based Weighted Cooperative Spectrum Sensing in Cognitive Radio Networks


  • Received:2009-07-24 Revised:2010-01-20 Online:2010-04-30 Published:2010-06-01


Cooperative spectrum sensing (CSS) is an approach to confront fading environment. However, in conventional cooperative spectrum sensing, the difference among the secondary users (SUs) is ignored when SUs suffer from different fading. In this paper, we propose a Signal-to-Noise Ratio (SNR)-based weighted spectrum sensing scheme to improve the sensing performance. Then the sensing performance of the weighted spectrum sensing scheme is firstly derived which previous work never related. Considering the minor contribution of the SUs with small weighted factor, we propose a selective cooperative spectrum sensing scheme where the SUs with low SNR are not selected into cooperative spectrum sensing. The simulation results confirm the analytical results. And the performance of weighted scheme is better than that of conventional schemes. In the case that the SNR of SUs are random distributed, the performance of selective scheme is almost the same as the weighted scheme while the number of cooperative SUs is reduced to save the consumption of system resource in cooperation with little additional complexity.

Key words:

Cooperative Spectrum Sensing, SNR-based weighted, Secondary users