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How to adapt AM transmitter to DRM transmitter?

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hamid

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how we can adapt AM transmitter to DRM transmitter?
what is the detailes of drm transmitter stacture?
 

QAM

The modulation is 16 or 64 QAM. It is claimed that this can be done on existing short wave transmitters. I suspect that the carrier phase is set at the oscillator and the amplitude is set by the usual AM modulation. This way a vector is made to the constalation point. I ffurther suspect that the output signal is sampled and demodulated as part of a feedback loop to compensate for any nonlinearity in the AM modulation process.
 

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