|Subject:||Question regarding transmission of a tone using QPSK|
|Date:||Tue, 14 Jul 2020 19:41:38 +0000|
I have been following the PSK guided tutorial https://wiki.gnuradio.org/index.php/Guided_Tutorial_PSK_Demodulation . I am on the mpsk_stage6.grc, but I want to transmit a simple tone instead of a random source, so I added a signal source which generates a sine wave. However, here are my questions:
1. I select the output of the signal source as bytes, and the time plot of it is attached. As you can see, the plot looks like bursts. But if I add an audio sink after signal source directly, I hear a constant tone. This does not make sense to me, as I thought I should hear discontinuous sound as the plot shows, could someone explain this?
2. With the first question being said, I am using a constellation modulator (QPSK) that takes 2 bits/symbol.
How can I feed the output of signal source ( a 16-bit audio file later on) to the constellation modulator properly?
Thanks in advance!
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