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We propose a new cooperative spectrum sensing for cognitive radio (CR) systems that is designed to detect low-power primary users (PUs). In previous works, it has been assumed that all cognitive terminals (CTs) are within the no-talk zone of PU, which is the region that a CT should not use the band of PU when it lies within the region. However, when the PU transmits at low power, only some CTs will...
Spectrum sensing plays a critical role in cognitive radio networks (CRNs). The majority of spectrum sensing algorithms aim to detect the existence of a signal on a channel, i.e., they classify a channel into either busy or idle state, referred to as a two-state sensing model in this paper. While this model works properly when there is only one CRN accessing a channel, it significantly limits the potential...
Cognitive radio (CR) network is promising for military usage since it enables the CR users in the field to sense and take the opportunistic use of vacant frequency bands if no primary users are present. As a key component of the CR technology, spectrum sensing has been investigated actively in existing literature. Among all the problems related to spectrum sensing, two of them seem to be challenging:...
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