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assortim
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Homework Statement
The problem is about the http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation" . This is a work from my course Analog signal processing.
Here is the scheme
http://img99.imageshack.us/img99/9449/zrgwj2.jpg
Two things to do :
1. Find the expression of x_qam(t)
2. Show that each of the signals m1(t) and m2(t) can be extract thanks to the synchronous detection using two local oscillators in quadrature (cf. scheme)2. The attempt at a solution
For the first question, I say :
m1(t)=cos(wp*t)
m2(t)=cos(wp*t-Pi/2)*sin(wp*t-Pi/2)
But I really doubt that is correct.
For the second question, I have no idea :(
As it is an work from my course "Analog signal processing", it should deal with transform Fourier and this kind of stuff but I really don't know how to start. It would be really great to have some help.
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