Forum: DSP Digital Mixer implementation for DUC/DDC

Author: ATIF JAVED (Guest)
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I am trying to implement digital up/down converter in which the 
implementation flow is

Interpolation->Digital mixer

Digital mixer->Decimation

In (DUC)digital mixer the input is I AND Q symbols then same I,Q are 
recovered at (DDC)digital mixer
I want to find out complete equations of Mixer so that i can easily 
implement it

According to my understanding in DUC digital mixer the equation is

And in the receiver side the I and Q is recovered through following 



but i cannot be able to recover the exact I and Q symobls at the 
receiver side please help to find the exact equations

Author: ossi-2 (Guest)
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What have you done so far? What are the frequencies and signals involved 
What type of lowpass do you use.  Show your code please.


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