For QAM combination of 2 signal?

For QAM combination of 2 signal or single signal which shows variations w.r.t phase and amplitude For modulation of the signal, how to calculate the frequency for a carrier signal inorder to attain high frequency signal from a low modulated one

For complete detail about QAM and its related concept and your query, you are recommended to visit the following links.



http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation

http://zone.ni.com/devzone/cda/tut/p/id/3896

http://volpefirm.com/docsis-101/docsis101_advanced-rf/