QPSK Demodulation of Modulated .wav file
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Walter Roberson 2021 年 6 月 24 日
Suppose you were doing a physics experiment, and that for one of the components you had distilled water, and for another component you had melted snow (for example you might be studying how heavy metals from pollution accumulate in snow.)
Question: do you need a different kind of container for the distilled water compared to the melted snow? Or do you use the same kind of container?
Question: do you need a different kind of pipe for the distilled water compared to the melted snow? Or do you use the same kind of pipe?
If one of the two components was liquid hydrogen, then you very definitely would use different kinds of containers and different kinds of pipes, so there are circumstances under which they need to be different. But is melted snow compared to distilled water sufficiently different for that purpose?
Now: you have a wav file that contains data that has been processed to QPSK modulate it. And you have another wav file that contains data that has not been QPSK modulated. Do the two need different kinds of files, and different kinds of Simulink signals? Or can use the same kind of file and the same kind of Simulink signal?
... because if they can use the same kind of file and signal, then your question should not be specifically how to get QPSK into the SDR decoder: your question should just be how you can get audio data from a file into Simulink, and what (if any) steps you need to turn the output of the audio file reader into the kind of signal used by the SDR decoder.
I know that recently someone replied to you with the Simulink block needed to read an audio file (with whatever meaning that audio encodes) into a Simulink double() frame . So the question should now perhaps be what kind of input signal is needed by the SDR decoder? If If you have a buffer of Simulink double() signal representing QPSK modulated data, what has to be done to transform that double() vector into something that the SDR QPSK demodulator can use?