Muti-tone detection using the warped discrete fourier transform

In this paper, we present a multi-tone signal detection technology based on the use of the warped discrete Fourier transform (WDFT). Compared to a conventional DFT or FFT, which has uniform frequency resolution across the entire baseband, the frequency resolution of the WDFT is externally controllable. This feature can be used to overcome the multi-tone signal detection limitation of the DFT/FFT. The paper demonstrates that by externally controlling the frequency resolution of the WDFT in an intelligent manner, multi-tone signals can be more readily detected and classified. Furthermore, the WDFT can be built upon an FFT enabled framework, insuring high efficiency and bandwidths.