I am no expert in the field, but maybe the device named "HackRF" is what you 
are looking for.
It is a low power SDR transceiver with an interface to GNU radio, and, with a 
20 Ms/s sampling (if I remember correctly - don't have the data sheet here) 
rate, the baseband should be broad enough for generating a QPSK signal in the 
Mbit/s range...

Greetings

Ralf, DL6OAP
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