scholarly journals Wideband Spectrum Sensing via Derived Correlation Matrix Completion Based on Generalized Coprime Sampling

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 117403-117410
Author(s):  
Kaili Jiang ◽  
Ying Xiong ◽  
Bin Tang
Keyword(s):  
Spectrum Sensing ◽  
Correlation Matrix ◽  
Matrix Completion ◽  
Coprime Sampling ◽  
Wideband Spectrum Sensing

scholarly journals An Active and Passive Reputation Method for Secure Wideband Spectrum Sensing Based on Blockchain

Electronics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1346
Author(s):  
Xinyu Xie ◽  
Zhuhua Hu ◽  
Min Chen ◽  
Yaochi Zhao ◽  
Yong Bai
Keyword(s):  
Cognitive Radio ◽  
Spectrum Sensing ◽  
Cognitive Radio Networks ◽  
Cooperative Spectrum Sensing ◽  
Sampling Rate ◽  
Radio Networks ◽  
Single Node ◽  
Decision Algorithm ◽  
Collusion Attacks ◽  
Wideband Spectrum Sensing

Spectrum is a kind of non-reproducible scarce strategic resource. A secure wideband spectrum sensing technology provides the possibility for the next generation of ultra-dense, ultra-large-capacity communications to realize the shared utilization of spectrum resources. However, for the open collaborative sensing in cognitive radio networks, the collusion attacks of malicious users greatly affect the accuracy of the sensing results and the security of the entire network. To address this problem, this paper proposes a weighted fusion decision algorithm by using the blockchain technology. The proposed algorithm divides the single-node reputation into active reputation and passive reputation. Through the proposed token threshold concept, the active reputation is set to increase the malicious cost of the node; the passive reputation of the node is determined according to the historical data and recent performance of the blockchain. The final node weight is obtained by considering both kinds of reputation. The proposed scheme can build a trust-free platform for the cognitive radio collaborative networks. Compared with the traditional equal-gain combination algorithm and the centralized sensing algorithm based on the beta reputation system, the simulation results show that the proposed algorithm can obtain reliable sensing results with a lower number of assistants and sampling rate, and can effectively resist malicious users’ collusion attacks. Therefore, the security and the accuracy of cooperative spectrum sensing can be significantly improved in cognitive radio networks.

scholarly journals Sub-Nyquist Wideband Spectrum Sensing Based on Analog to Information Converter for Cognitive Radio

2021 ◽  
Vol 182 ◽  
pp. 132-139
Author(s):  
Marwa Mashhour ◽  
Aziza I. Hussein ◽  
Hussein Sh. Mogahed
Keyword(s):  
Cognitive Radio ◽  
Spectrum Sensing ◽  
Wideband Spectrum Sensing
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