Hello all,

I'm a new designer in the field of RF system design..

I'm designing an RF system on ptolemy , in order to improve the accuricy , I had to perform RF upsampling with raised cosine filtration "intterpolation filter"

Two problems exists,first upsampling causes the constallation of my received signal "64 QAM" to be completely destroyed , even after down sampling , second the signal level at RF  is changed when compared to no upsampling case.

Sorry for the long topic.