FFT processing of IQ data

1. What is IQ data signal processing?
2. Is IQ data in frequency domain?
3. What is FFT processing?
4. How is FFT used in signal processing?

What is IQ data signal processing?

Quadrature signals, also called IQ signals, IQ data or IQ samples, are often used in RF applications. They form the basis of complex RF signal modulation and demodulation, both in hardware and in software, as well as in complex signal analysis.

Is IQ data in frequency domain?

The IQ data can be in the time domain (time vs amplitude+phase) or, usually post processing with a transform be, in the frequency domain (frequency vs amplitude+phase).

What is FFT processing?

(Fast Fourier Transform) A computer algorithm used in digital signal processing (DSP) to modify, filter and decode digital audio, video and images. FFTs commonly change the time domain into the frequency domain.

How is FFT used in signal processing?

The FFT algorithm is used to convert a digital signal (x) with length (N) from the time domain into a signal in the frequency domain (X), since the amplitude of vibration is recorded on the basis of its evolution versus the frequency at that the signal appears [40].