stft for complex data

Hello,

I have I and Q signals and want to see my data in frequency domain. So is there any way to get stft of I and Q signals in complex form ?

Thanks.

[Mathieu NOE]

hello

I and Q are real valued data ? not complex I assume , so you can do stft of each one

[nur dsc]

Hello,

No, applying stft for each one is not useful to get frequency domain response effectively.

Answer 1

[Bjorn Gustavsson]

Shouldn't that be as simle as:

Acmplx = I + 1i*Q;
spec = fft(Acmplx); % or spectrogram etc

HTH

[nur dsc]

Hi,

If you have orijinal x signal you can use hilbert(x).

result = hilbert(x)

then you can apply stft to result.

result_updated = stft(result)

But thanks for answer :)

[Bjorn Gustavsson]

What is the I and Q signals you have? Explicitly.

If you have the original signal there is no need to Hilbert-transform before doing the STFT-analysis.