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Gao, Yuan,Deng, Zhixiang,Choi, Dongmin,Choi, Chang Elsevier 2018 Journal of parallel and distributed computing Vol.114 No.-
<P><B>Abstract</B></P> <P>In this paper, we propose a cooperative spectrum sensing scheme including a combined pre-detection and sleeping policy. In the scheme, the designed pre-detection sub-phase is applied at the beginning of the detection of the presence of a primary user, where all sensing nodes are involved to improve the detection performance. The sleeping policy is applied for each sensing node respectively at the end of the pre-detection sub-phase and the beginning of the transmission of the local detection results, in order to decrease sensing energy consumption. We formulate the problem of minimizing the maximum average energy consumption per sensing node in Rayleigh fading channels, considering the constraints of the required global detection and false alarm probabilities and the tolerable interference caused to the primary user. Numerical results show that the scheme achieves significant energy saving as compared to a scheme that includes only a sleeping policy and does not consider pre-detection.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We propose a combined pre-detection and sleeping scheme for spectrum sensing. </LI> <LI> The sensing performance is not affected by a high sleeping rate of secondary relays. </LI> <LI> An analytical framework is based on more practical channel conditions. </LI> <LI> A search algorithm is studied to obtain low complexity for solving the optimal problem. </LI> <LI> The proposed scheme achieves significant energy saving for spectrum sensing. </LI> </UL> </P>