Date Added: Jan 2010
Despite the shortage of available frequency spectrum, recent studies have shown that the actual usage of the allocated spectrum is scarce. The IEEE is developing the 802.22 standard for spectral reuse in TV bands that uses Cognitive Radio (CR) technology. One of the essential and challenging features of CR is spectrum sensing. This paper proposes a novel spectrum sensing algorithm using spectral covariance of the received signal. The proposed Spectral Covariance Sensing (SCS) algorithm exploits different statistical correlations of the signal and noise in the frequency domain. Test statistics are computed from the covariance matrix of spectrogram and compared with the decision threshold.