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Cognitive radio is a promising scheme of 5G to efficiently utilize the spectrum and greatly gain in capacity, and energy detection algorithm is widely adopted in spectrum sensing for the low complexity of the receiver structure and no need of primary signal information. Single user energy detection in cognitive radio system has been proved vulnerable to the noise uncertainty, and suffered from the...
Via the cognitive radio (CR) technology, the ship ad-hoc network (SANET) can effectively utilize the system spectrum. To reduce the interference brought into the primary network, the hidden primary user problem should be carefully considered for the SANET applications. In this paper, we suggest a notification-based cooperative spectrum sensing scheme used to solve such a problem. The numerical results...
Energy detection has a low complexity of receiver structure and requires no information about primary signal. However, a single user detection has been proved vulnerable to the noise uncertainty, which causes the existence of a SNR wall belowwhich the detector cannot robustly a chieve the given detection requirement. Compared to single user detection, cooperative energy spectrum sensing algorithms...
Cooperative energy spectrum sensing has been widely applied in cognitive radio (CR) networks. In this paper, two cooperative sensing algorithms based on the received signals' correlation matrix were proposed. The first proposed algorithm made use of both diagonal elements and non-diagonal elements in the cooperative scheme. In the second algorithm, when the sensing station can obtain the information...
The cognitive radio technology is very helpful in improving the use of spectrum resources and reacting its operating environment. This paper presents a novel embedded framework for secondary user based a single FPGA in cognitive network. By analyzing the processing ability of FPGA and evaluating the existed architecture, this framework based FPGA supplying more logic resources and stronger embedded...
Cooperative energy spectrum sensing has been proved effective to detect the spectrum holes in Cognitive Radio (CR). However, its performance may suffer from the noise uncertainty, which is portrayed by the SNR wall in some literatures. In this paper we analyze the spectrum sensing performance under noise uncertainty and propose a new approach to obtain the SNR wall. In addition, a suboptimal liner...
Cooperative energy spectrum sensing has been proved effective to detect the spectrum holes in Cognitive Radio (CR). However, few studies make mention of wavelet transform based signal processing before energy detection. In this paper, a novel cooperative energy spectrum sensing algorithm with 1-D or 2-D wavelet denoising is proposed. The 1-D wavelet denoising is performed at each sensing node, while...
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