Azzera filtri
Azzera filtri

How to generate inphase and quadrature phase of a signal?

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I was trying to simply create I Q components of a signal and to recover the signal from these I Q data.
But how to create I Q? is it possible by multiplying signal with sin and cos? or by taking samples at 4 points (0,90,180,270)??
  1 Commento
mechetoune walid
mechetoune walid il 11 Nov 2020
Google it and check this link.
https://www.markimicrowave.com/blog/top-7-ways-to-create-a-quadrature-90-phase-shift/

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Risposte (3)

Colin
Colin il 10 Giu 2014
You might look into Hilbert transforms - Matlab function Hilbert.
From a real signal, this generates a complex signal of which the real part is the original signal, and the imaginary part is the Hilbert transform. This is essentially the original signal phase-shifted by 90 degrees

Rick Rosson
Rick Rosson il 6 Dic 2012
Modificato: Rick Rosson il 6 Dic 2012
z = x + j*y;
v = x.*cos(2*pi*Fc*t) - y.*sin(2*pi*Fc*t);
I = real(z);
Q = imag(z);
  3 Commenti
Rick Rosson
Rick Rosson il 7 Dic 2012
Modificato: Rick Rosson il 7 Dic 2012
If you have a pure sin function, then that means by definition that I = 0 and Q = -1. If that seems confusing to you, then please review the details of in-phase and quadrature.
This forum is for questions about MATLAB, not to help understand math and engineering concepts.
XUAN LIU
XUAN LIU il 27 Mag 2020
i am afraid what you said is not correct

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Marcos Fernandez
Marcos Fernandez il 16 Dic 2017
Hi Akhil,
your suggestion is correct, try to multiply the signal by sin and cos.
Hope this helps.
Regards, Marcos

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