Hybrid Cooperative Spectrum Sensing Scheme Using Double-Fusion in Cognitive Radio Networks
نویسندگان
چکیده
In cognitive radio networks, cognitive users can be coordinated to perform cooperative spectrum sensing so as to detect the primary user more accurately. In this paper, a hybrid cooperative spectrum sensing method is investigated to improve the sensing performance by exploiting double-fusion approach. In special, data fusion and decision fusion are both studied. For the first stage, cognitive users send their energy to the fusion center with data fusion in each cognitive cell. For the second stage, the fusion center in each cognitive cell communicates the decision with each other and makes the final decision by using decision fusion. In addition, we derive the optimal number of cognitive users and cells in the proposed scheme. Numerical results show that the sensing performance is improved significantly as opposed to conventional cooperative spectrum sensing with single fusion.
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