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Recently, cognitive radio has become a hot spot, in which secondary users could use the frequency bands when primary users are absent. Hence, the detection of primary users' presence plays an important role in cognitive radio networks. In this paper, a cognitive radio network with multiple licensed users is considered. Secondary users cooperatively detect the presence of primary users using energy detection and send the sensing results to the secondary base station. To minimize the probability of false alarm while keeping the probability of detection with respect to the secondary network, we should schedule secondary users to cooperation appropriately, which is formulated as an optimization problem. However, it is hard to solve this optimization problem, hence two suboptimal solutions are proposed. Simulation results show that the proposed schemes are able to greatly improve the sensing performance in cognitive radio networks.