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In cognitive radio networks, malicious user (MU) sends a signal which is similar to the primary user's (PU) signal, leading to the secondary user (SU) can't access to the spectrum of communication networks, which is named primary user emulation attack (PUEA). In this paper, we first propose a cognitive radio networks model with motional users, while MU and SUs are made up of an approximation centralized...
Cognitive radio is a promising technology to solve the shortage of spectrum resource. As sensing nodes of the network, secondary users are usually battery powered. Making full use of the energy should also be considered while designing the network. In this paper, we consider the overall throughput of the system and energy consumption. We propose a model of throughput and energy consumption to discuss...
This paper proposes a novel and efficient distributed flow control for wireless multimedia networks using cooperative communications, based on the Proportional Integral (PI) controllers. The control parameters can be designed to ensure the stability of the control loop in terms of source rate. The distributed explicit rate controller is located at the wireless multimedia sensor source to regulate...
In cognitive radio networks, the improved energy detector is a very useful detector for the random signals corrupted by Gauss noise. In the single node sensing, we research the change of p values which has impacted on system performance under certain signal to noise ratio and obtain the optimal p values making the Bayes risk minimum. In the cooperative spectrum sensing, we use “K-out-of-N” rule and...
In the frequency-limited cellular networks, the underlaying Device-to-Device (D2D) communications is an efficient way to enhance the user access probability and network capacity performance. To satisfy the communication requirements for users in different network sizes, a cooperative transmission strategy based on multi-relay D2D communications is proposed. Specifically, to increase the serving users...
In this paper, we investigate the subcarrier allocation and power adjustment to maximize the sum data rate of the secondary users with limited interference to the primary users in OFDM-based cooperative cognitive networks. A fixed common relay is introduced to forward the data of the secondary users by adopting two-way amplify-and forward (AF) relay. By categorizing the subcarriers into 2 classes,...
In this paper, adaptive power allocation (PA) on the source and relay is investigated to maximize energy efficiency (EE) for OFDMA opportunistic DF links (O2RL). We derive EE function from O2RL model by appropriate definition of variables to represent source/relay PA, subcarrier transmission mode selection (STMS) elegantly. Theoretical analysis demonstrates that EE function for O2RL is strictly quasi-concave...
Cooperative communication is an efficient technology to achieve high bandwidth demands and wide error-prone client coverage. However, the previous cooperative multicast protocols suffer from bandwidth-violation problem while selecting relay nodes, namely, the cooperative hidden route problem (CHRP) by distributed protocols in wireless multicast networks. In this paper, a novel relay selection algorithm...
In the existing cooperative spectrum sensing, fusion centers (FC) fuses these data received from cognitive users (CUs) without screening, which provides more opportunities for malicious users (MUs) hiding in the legal users to launch spectrum sensing data falsification (SSDF) attacks, SSDF easily mislead the FC to make incorrect decisions, resulting in reducing accuracy of spectrum detection. So,...
Spectrum sensing is the key technology in enabling spectrum awareness in cognitive radio. The performance of the spectrum sensing depends on the sensing method. In this paper, by means of random matrix theory (RMT), a novel spectrum sensing scheme and a threshold decision rule are proposed based on the difference between the maximum and the minimum eigenvalue (DMM) cooperative spectrum sensing algorithm,...
Feedback delay often exists in actual communication systems. Relay selection with feedback delay was based on outdated channel state information, which would seriously deteriorate the performance of cooperative communication system. In cooperative system, the best relay is selected to participate in process of information transmission, which can save system power and reduce costs. In this paper, we...
Compress sensing (CS) for power spectrum reconstruction (PSR) enables precise and efficient spectrum sensing in cognitive radio networks. Existing CS schemes mainly focus on reconstruction of the original signal, and thus are not appropriate for PSR reconstruction. To counteract this drawback, this letter proposed a cooperative scheme of CS for PSR named decorrelation scheme. A PSR model for cooperative...
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