pattousai

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.

Hi everybody. Well, the question is pretty much what i already written in the title. How i divide by two the number of points of a IQ signal without losing his frequency? Thanks for the attention and sorry for the bad english.