Feasibly efficient cooperative spectrum sensing scheme based on Cholesky decomposition of the correlation matrix. Issue 9 (1st June 2016)

• Record Type: Journal Article
• Authors: Li, Zan; Zhou, Fuhui; Si, Jiangbo; Qi, Peihan; Guan, Lei
• Is Part Of: IET communications. Volume 10:Issue 9(2016)
• Page Start: 1003
• Page End: 1011
• Publication Date: 2016-06-01
• Subjects: wireless channels -- radio spectrum management -- signal detection -- cooperative communication -- matrix decomposition -- cognitive radio -- eigenvalues and eigenfunctions -- probability; correlation matrix Cholesky decomposition -- cognitive radio system performance improvement -- multiple secondary users -- primary user -- maximum eigenvalue to minimum eigenvalue ratio -- test statistic -- false alarm probability -- decision threshold -- analytical approximation -- moment matching method -- blind cooperative spectrum sensing scheme -- primary user signal -- noise power -- wireless channel; Telecommunication systems -- Periodicals; Speech processing systems -- Periodicals; 621.38205
• DOI: 10.1049/iet-com.2015.0654
• Languages: English
• ISSNs: 1751-8628

Abstract

Abstract : Cooperative spectrum sensing, proposed to improve the performance of spectrum sensing in cognitive radio systems where there are multiple secondary users who can cooperatively detect the presence of one primary user, is receiving significant attention. However, few cooperative sensing algorithms take the correlation among the received primary user signals into account. A feasibly efficient cooperative spectrum sensing scheme based on Cholesky decomposition of the correlation matrix of the received signals is proposed. The ratio of the maximum eigenvalue to the minimum eigenvalue of the matrix obtained by Cholesky decomposition is used to construct the test statistic. Analytical approximations for the false alarm probability and decision threshold are derived using a moment matching method. The new scheme is in the category of blind cooperative spectrum sensing schemes requiring neither information about the primary user signal nor the channel nor the noise power. The new scheme can work better than the existing eigenvalue‐based cooperative spectrum sensing methods in some conditions, and it has lower complexity.