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Problems with QAM/QPSK/MSK PassBand mod/demod

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shlomyss

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Hi all


I tryed to program it myself but when I multiply the quadrature component by sin I get values that very close to 0, ( I do not have a problem when I choose low Carrier Freq)

it's looks like this : imag(Y(n))*A*sin(2*pi*Fc*t);
while Y(n) is the quadrature component and Fc is 10000Hz.

When I multiplying the inphase component by cos I get the correct signal


I would appreciate if anyone can explain to me whas wrong in my code.. and also If anyone can send me to my email or post here .m file of QAM/QPSK PassBand Transiever.
 

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