Intrinsic Mode Function Based Noise Power Estimation With Applications to Semiblind Spectrum Sensing Methods

In this letter, an algorithm is proposed to blindly estimate the noise power embedded in a received signal and use the knowledge of the noise power to upgrade semiblind spectrum sensors to blind sensors. The proposed noise estimator is based on a relationship between the noise power of a received signal and the power of the first mode of the empirical mode decomposition algorithm. Simulations and results demonstrate an enhancement of the detectors performance in contrast with their conventional semiblind versions.