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In cognitive radio (CR), spectrum sensing plays a fundamental and critical role. This paper deals with the issue of spectrum sensing in a distributed CR network, and proposes a novel relay based cooperative spectrum sensing method, which makes one secondary user (SU) with higher signal-to-noise ratio spend part of its sensing time acting as the relay node.(More)
In spectrum sensing for cognitive radio networks, the secondary users should detect whether the primary user is present as soon as possible to improve the throughput of the secondary system. This paper investigates the problem of minimizing the detection time of log-likelihood ratio test based cooperative spectrum sensing under the constraints on accuracy(More)
In order to identify spectrum holes, secondary users (SUs) should detect whether the spectrum band is occupied by primary user (PU). Cooperative PU detection is the most prevalent PU detection method in cognitive radio (CR) networks. Existing cooperative PU detection usually consumes a dedicated reporting channel to share the detection results. This paper(More)
In cognitive radio where continuous spectrum monitor is required, primary user detections should be performed successively. As the primary user usually keeps absent/present for some time, its states (absence or presence) at successive detections are not independent with each other. In this paper, a novel detection scheme is proposed to exploit the relation(More)
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