I once read a website that discusses about applied FFT algorithm on microcontroller, they use complex signal (IQ signal) to processed the FFT (one input signal but be treated on two condition, I signal --> input signal be multiplexed by local oscillator with 0 of difference phase, and Q signal --> input signal be multiplexed by local oscillator with 90 of difference phase)
what do you think about this methode (FFT on Complex signal)?
what is the difference both FFT on complex signal and FFT regullary?