How to generate inphase and quadrature phase of a signal?

Question

Akhil 2012-12-6

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评论： mechetoune walid 2020-11-11

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)??

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mechetoune walid 2020-11-11

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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Answer 1

Colin 2014-6-10

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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

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Answer 2

Rick Rosson 2012-12-6

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编辑：Rick Rosson 2012-12-6

在 MATLAB Online 中打开

   z = x + j*y;
   v = x.*cos(2*pi*Fc*t) - y.*sin(2*pi*Fc*t);
   I = real(z);
   Q = imag(z);

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Rick Rosson 2012-12-7

编辑：Rick Rosson 2012-12-7

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 2020-5-27