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1 In cognitive radio systems, the accuracy of spectrum sensing depends on the received primary signal strength at the secondary user (SU). In fact, a single node sensing would be compromised if the received signal strength is not high enough to be detected by this node. In this paper, we propose a cooperative decision fusion rule based on adaptive linear combiner. The weights which correspond to confidence levels affected to SUs, are determined adaptively using the Normalized Least Mean Squaresdoi:10.1109/vtcfall.2012.6399369 dblp:conf/vtc/NasrC12 fatcat:z5exphoeordsrdvl2rho5ottwa