Spectrum sensing is an essential phase in cognitive radio networks (CRNs). It enables secondary users (SUs) to access licensed spectrum, which is temporarily not occupied by the primary users (PUs). The widely used scheme of spectrum sensing is cooperative sensing, in which an SU shares its sensing results with other SUs to improve the overall sensing performance, while maximizing its throughpu...

Spectrum sensing is an essential phase in cognitive radio networks (CRNs). It enables secondary users (SUs) to access licensed spectrum, which is temporarily not occupied by the primary users (PUs). The widely used scheme of spectrum sensing is cooperative sensing, in which an SU shares its sensing results with other SUs to improve the overall sensing performance, while maximizing its throughpu...

This paper describes a multichannel super-heterodyne signal analyzer, called the Spectrum Analysis Solution (SAS), which performs multi-purpose spectrum sensing to support spectrally adaptive and cognitive radar applications. The SAS operates from ultrahigh frequency (UHF) to the S-band and features a wideband channel with eight narrowband channels. The wideband channel acts as a monitoring cha...

Joint radar and communication (JRC) is a promising technique for spectrum re-utilization, which enables sensing data transmission to operate on the same frequencies devices. However, due multi-objective property of JRC systems, channel allocation nodes should be carefully designed maximize system performance. Additionally, because broadcast nature wireless signals, watchful adversary, i.e., war...

In this paper, we present a Link-16-based tactical data link (TDL) simulator with cognitive antijamming capability (CAJC). CAJC improves antijamming capability of existing TDL by adding the cognitive radio (CR) spectrum sensing-based jammer detection. In the presented TDL, each terminal that senses (or detects) the jammer signal can avoid the jammer spectrum opportunistically. For jammer signal...

In order to obtain more precise spectrum sensing performance in cognitive radio networks, a twostage spectrum sensing approach is investigated. More specifically, a coarse spectrum sensing based on energy detection is introduced in the first stage. When the sensing decision is idle channel by coarse sensing, a fine spectrum sensing based on first order cyclostationary feature detection is explo...

Cooperative wide-band spectrum sensing has been considered to enable cognitive radio operation of wireless regional area networks (WRAN) in the UHF and VHF TV broadcasting bands. In this paper, cooperative compressed spectrum sensing is considered to enable fast sensing of the wide-band spectrum. The speed and accuracy of spectrum sensing are improved by further optimization of the compressed s...

—Spectrum sensing strategy is key to realize cognitive radio. However, spectrum sensing error would affect the access strategy of secondary users in cognitive networks. This paper addresses the spectrum sensing strategy under imperfect spectrum sensing, and proposes opportunistic spectrum access strategies for the imperfect spectrum sensing and fading channels respectively. By setting the opti...

Compressed sensing has shown great potential in reducing data acquisition time in magnetic resonance imaging (MRI). Recently, a spread spectrum compressed sensing MRI method modulates an image with a quadratic phase. It performs better than the conventional compressed sensing MRI with variable density sampling, since the coherence between the sensing and sparsity bases are reduced. However, spr...

Cognitive radio is a new paradigm in wireless communication to improve the spectrum utilization in cognitive radio networks. Cooperative spectrum sensing techniques improves the sensing performance but at the cost of increased energy consumption. Here, in this paper, we propose an energy efficient algorithm which optimizes both sensing time and number of participants in OR rule of cooperative s...