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how to measure the frequency of a iq signal

Hi everybody!!

Well, i think this isn`t the real place to ask this question, but i could't find a better one. My doubts is more relative to the teory and is basic what i wrote in the title.

How i measure the frequency in a IQ signal (by some experimentals, i think that is just do the FFT of the real part, but, why??)? If anyone can indicate me any material that explains all the theory about IQ signal i will be glad.


Thanks for everybody and sorry for the bad english.
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I believe that the content of this link will go to help it sufficiently http://www.masimo.com/pdf/whitepaper/LAB3412A.pdf Murilo Oliveira National Intruments Brazil
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