Abstract:Fourier transform of ramp signal, a kind of power-infinite signal, commonly appears in many complex function and integral transformation related textbooks. However, some have questioned the existence of Fourier transforms for power-infinite signals, contending that the spectral characteristics of their transformations lack theoretical significance and practical application. By analyzing the basic definition, computational characteristics, and physical significance of the Fourier transform, along with the frequency characteristics of ramp signals, it is proposed that, in the process of signal spectrum analysis, Fourier transform may not be applicable to power-infinite signals.