A naive question I guess. Would it make a difference in the results when a system is simulated at Baseband or at Passband. If I have a plot of a BER vs SNR curve that has been plotted at Baseband, will the same change if I perform the simulation at Passband with a carrier frequency of 2.4GHz? AFAIK, it should not make a difference, but I would like to know if what I am thinking is correct.
Another question is that if I have two signals from two transmitters and add these signals at the receiver, does it make a difference if these two signals are passband or baseband. Do the results vary? Since Passband simulation consumes a lot of time, would it be correct if I simulate the behavior at Baseband and assume that the result would be almost the same at the Passband?