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Energy efficient and reliable spectrum sensing become essential in cooperative cognitive radio networks. However, cooperation in spectrum sensing (SS) is often vulnerable to several security threats; one such operation is primary user emulation attack (PUEA). To address the issues, an optimization framework is developed in this work to minimize the energy consumption in cooperative spectrum sensing...
The effective capacity of the cognitive radio system is an important parameter to measure its performance. It is affected by the accuracy of spectrum sensing and spectrum management scheme. In this paper, we first design a multi-channel cognitive radio model in opportunistic spectrum access scenario. In this model, every channel has three different states. The transfer between the channel states is...
The periodic sensing requirements in cognitive radios cause interruptions for secondary user (SU) communication. As a result, the throughput of the secondary system during sensing can be very low. In this paper, we propose a monitoring scheme for Orthogonal Frequency Division Multiplexing (OFDM) based cognitive radio which can monitor the spectrum during ongoing communication and detect the emergence...
In this paper, a distributed fair algorithm is proposed to address the resource allocation problem in the cognitive femtocell network. The cognitive functionalities equipped in femtocells enable us to effectively identify the qualified resource blocks (RBs), thus we can mitigate inter-cell interference. By exploiting the satisfaction degree and the channel state difference, the proposed distributed...
Conventional cooperative spectrum sensing (CSS) schemes in cognitive radio networks (CRNs) require that the secondary users (SUs) report their sensing data sequentially to the fusion center, which yields long reporting delay especially in the case of large number of cooperative SUs. By exploiting the computation over multiple-access channel (CoMAC) method, this paper proposes a novel CoMAC-based CSS...
This paper proposes a wideband spectrum sensing scheme in cooperative cognitive radio networks. The proposed multiband scanning method efficiently exploiting scheduling diversity outperforms the conventional multiband scanning method using the spatial diversity. The proposed scheduling diversity is more beneficial to the low-SNR regime with a large number of sensors and sensing channels.
Opportunistic spectrum sharing (OSS) has become an effective method to fully utilize the scarce spectrum resources. In this paper, we propose an OSS scheme with quality-of-service (QoS) support for secondary users (SUs) in cognitive radio networks (CRNs). SUs are classified into the SUs with real-time traffic (RT-SUs) and the SUs with non-real-time traffic (NRT-SUs). The RT-SUs have higher terminated-priority...
The cooperative spectrum sensing techniques in cognitive radio networks increase the energy consumption while improving the throughput of the system. The energy efficient techniques with sensing time optimization are considered in this paper. The optimization model is established, in which the sensing time is to be optimized to maximize the energy efficiency. Then, the golden section search algorithm...
Spectrum sharing is an important topic in cognitive radio sensor networks (CRSNs). Bio-inspired consensus-based schemes can provide lightweight and efficient solutions to ensure spectrum sharing fairness in CRSNs. In this paper, in order to achieve the defined spectrum sharing fairness, we propose two schemes called the local control scheme for unbiased fairness (LCS-UF) and the local control scheme...
In this paper, we investigated the throughput of a cognitive radio network where two primary frequency channels (PCs) are sensed and opportunistically accessed by N secondary users. The sharing sensing member (SSM) protocol is introduced to sense both PCs simultaneously. The throughput of the network is formulated as a convex optimization problem. The numerical investigation shows that the proposed...
Cognitive radio (CR) is a promising technology for overcoming the lack of available communication bands. In CR technology, spectrum sensing is an important issue, which has recently been extensively studied. We provide a solution to the spectrum-sensing problem for multiple cognitive terminals (CTs) that takes into account the difference among CTs with respect to the probabilities of a false detection...
Cooperative spectrum sensing is investigated for the purpose of detecting the primary user accurately in cognitive radio systems. As the report channel between cognitive users and fusion center experiences fading or shadowing, a cluster based cooperative sensing method is proposed to improve the sensing performance. However, when the number of the cognitive users in each cluster increases, the bandwidth...
We propose an energy-efficient Distributed Spectrum Sensing (DSS) scheme, called cluster-and-forward based DSS scheme, for our developed two-tier hierarchical cognitive radio network. At each time step, our proposed scheme dynamically clusters the secondary users into multiple groups and selects the Cluster Head (CH) from the secondary users in each group. The selected CHs collect the spectrum sensing...
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