I've generated a 10MHz LTE signal in the same IQ format as in the example design. Can i use OSC application to modulate this IQ file and connect to a spectrum analyzer for LTE demodulation analysis.
Yes you can load the file using the iio-scope application. Go to the FMCOMMS2 plugin page of the application and select "DAC Buffer output" for the "DDS Mode". You can then select a file which to load and transmit.
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