The idea, when I bought the hackrf, was to be able to analyze real signals, viterbi, reed solomon , power, C/N etc ,,,
As I said before, I can record an 8K 64 QAM signal with gqrx and reproduce it with GNURADIO without problems (just a small loss of MER) in a conventional dvb-t receiver
At the moment, and before buying a more powerful computer, I would settle in being able to work with files (recordings) and that the constellations of the flowgraph would lock
Best regards