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In this paper, we investigate the performance of adaptive modulation in spectrum sharing cognitive relay networks, where the secondary user (SU) transmits the message by one best relay with amplify and forward (AF) relaying scheme. Moreover, to guarantee the primary user (PU)'s transmission quality, the interferences caused by the SU transmitter and the(More)
In this paper, we investigate a robust spectrum sensing scheme using multiple antennas, which exploits the information of eigenvalues' characteristics of the sample covariance matrix. The difference between the maximum eigenvalue and the average of the remainder eigenvalues of sample covariance matrix is utilized as the test statistic. Besides, by(More)
Cooperative spectrum sensing has draw great attention due to its advantages in high sensing performance and overcoming the hidden primary user problem. However, large numbers of secondary users participating in cooperative spectrum sensing result in extensive overhead due to sensing reporting and sensing decision. Additionally, spatial correlation among(More)