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Spectrum sensing is a fundamental problem in cognitive radio. In this paper, we introduce two spectrum sensing methods based on Gerschgorin disk. The Gerschgorin radii contain the information of signal subspace, whereas the Gerschgorin centers capture the signal energy. The first proposal only relies on the Gerschgorin radii and thereby is robust against nonuniform noise. The second one, utilizing both the Gerschgorin radii and centers, can significantly improve the detection performance.doi:10.1109/icassp.2014.6855013 dblp:conf/icassp/LiHSS14 fatcat:elx2argxozd6la6gesmseocd5i