Kr�tkoczasowa transformata Fouriera impuls�w ultraszerokopasmowych UWB

Short-time Fourier transform of ultrawideband signals

“…Two basic parameters of windows' spectra are used to evaluate their properties in the STFT analysis: the width of the main lobe and the maximum level of side lobes in the spectrum that is calculated by a basic Fourier transform. There are many window types developed for the use in the STFT calculation [6,7,10].…”

“…In case of a sine window it can be observed that the width of the main lobe is slightly wider but the level of the first side lobe, compared to a rectangular one, is lower and equals -22dB. The characteristics and formulas used to describe other types of windows are presented in [7,10].…”

“…It was shown in [7,10] that other types of window shapes are characterized by a lower side lobes level and a wider main lobe of their spectrum. This significantly changes the results of the Fourier spectrograms calculations and, thus, it can contribute to a more efficient usage in practical solutions.…”