Low complexity 2-level (FFT-GOERTZEL) spectrum sensing method for cognitive radio

Abstract

Energy detection in frequency domain is a preferred technique for the spectrum sensing and the accuracy of frequency estimation depends on the Discrete Fourier Transform (DFT) size. Instead of computing full length (N) DFT of the whole data, a new two level (coarse-fine) technique for energy detection is proposed. In the first (coarse) level, time averaging of smaller size (L<