In spite of the complicated behavior in the time domain, long GRBs show a simpler behavior in the Fourier domain of frequencies, represented by power density spectra, PDS. Recently, there are some relations found between GRBs properties and PDS parameters, modeled by power-laws. Among them, the correlation between peak energy $E_{peak}$ and PDS slope $alpha$ shows a clear evidence. In this work we try to understand the origin of this correlation, making use of synthetic pulses. We find some preliminary evidences that $E_{peak}-alpha$ relation can be seen as a new confirmation of the empiric relations $E_{peak}-L$ and $t_{p}-L$ for GRBs.
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