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Spectrum sensing is an essential mechanism for a cognitive radio system. However, the security aspects of spectrum sensing receive little attention so far. In this paper, we identify two kinds of untrusted secondary users which are called dasiaAlways Yespsila users and dasiaAlways Nopsila users. These untrusted secondary users can degrade detection performance greatly, especially when conventional...
Spectrum sensing is an essential mechanism in a cognitive radio network. However, the detection performance will be greatly degraded when few untrusted secondary users exist which can be identified as 'Always Yes' users and 'Always No' users. In this paper, we propose an energy detector with double thresholds combined with revised data fusion rules to find these untrusted users and counteract their...
In cognitive radio networks, the limitation of control channel bandwidth is a challenge of cooperative spectrum sensing when the number of cognitive users becomes very large. Cluster- based architecture is applied for cooperative sensing to avoid the congestion on control channel and reduce the sensing delay. In this paper, we propose a cluster-based cooperative spectrum sensing scheme to improve...
In a wireless regional area network (WRAN), the presence of wireless microphone (WM) signals must be detected as primary users. However, very narrow bandwidth and low power makes it difficult to sense WM signals especially when these WM signals are distributed in a wideband spectrum. In this paper, a singular value decomposition (SVD)-based approach is presented to sense and estimate multiple WM signals...
In a wireless regional area networks (WRAN) network, the presence of a wireless microphone (WM) signal must be detected as a primary user. However, very narrow bandwidth and low power makes it difficult to sense a WM signal. In this paper, a singular value decomposition (SVD)-based approach is presented to sense and estimate a WM signal. After performing SVD on the received data matrix, the presence...
Cognitive radio (CR) is an effective technology for flexible utility of radio spectrum and has received increasing attention so far. To ensure reliable spectrum sensing, quiet periods (QPs) are allocated during which all secondary users cease transmission and perform spectrum sensing. Such that, regular transmission will be interrupted periodically and the system quality of service (QoS) could be...
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