Spectrum Edge Decision Method For Energy Detection With Fft

This paper proposes a spectrum edge decision method for an energy detection with fast Fourier transfer (FFT) in cognitive radio system. Whereas the energy detection method is simple algorithm and that using FFT can detect spectrum over a wide band, there is a problem that the spectrum edges in frequency domain are unclearly detected under environment without previous knowledges of primary systems. In the cognitive radio system, it needs to correctly detect the spectrum edge for effectively using limited wireless resources. Therefore, we proposes the spectrum edge decision method for the cognitive radio system. In this paper, the performances by the proposed method are evaluated by simulation.