Fractional Fourier domain communication system: System structure and signal modeling

In Transform Domain Communication System (TDCS), the traditional methods of spectrum sensing and interference mitigation have some unavoidable shortcomings in the non-stationary scenarios. On this consideration, fractional Fourier transform is introduced into TDCS to obtain a better performance in processing the non-stationary signals, like linear chirp signals. By rotating a certain angle in time-frequency plane, chirp signal will concentrate in the corresponding fractional Fourier domain. This property enhances the non-stationary interference mitigation capability. Meanwhile, by using the fractional domain signal model proposed in this article to synthesize the adaptive fundamental modulation waveform we can integrate the signal design process of different mechanisms in a more general form. One step further, multi-domain communication system might be realized on software designed radio platform, opening up a potential orientation for multi-resource reusing in the signal design level.