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A new spectrum sensing scheme based on the multiple third order cyclic frequencies in cognitive radio networks is proposed in this paper. The binary hypothesis test model and the test statistic are constructed to derive the explicit formula of the detection probability by exploiting the asymptotic optimal estimation theory. The computational complexity of the proposed scheme is nearly as the same order of magnitude as that of Energy Detection (ED) by comparing the real multiplication operation times of them. At last, numerical results are demonstrated to illustrate that the authors' new scheme has superior performances with lower computational complexity.
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