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as a fun project I am trying to build Quadrature Phase Shift Keying (QPSK) modulator & demodulator for a Digital Video Broadcasting (DVB) application. I am using the LimeSDR mini as my hardware and GNU radio as a starting point.

My first 'test case' is to just setup the QPSK signal to get passed through - straight from the sample source to the sample sink - but when I do that, garbage data is sent out the sink. A signal at the correct frequency is generated, but the data is not able to be demodulated by my test hardware.

I've been working with DVB for a while, but now just getting into the signal processing of it and Ive been having trouble.

Attached .grc and screenshot of my gnuradio blocks. Am I doing something wrong when setting up the passthrough section? What steps can I take to debug?

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  • $\begingroup$ Your question is more about GNUR implementation details than signal processing, you should probably ask for help on a community which knows more about the programming environment you are using. $\endgroup$ – PAK-9 Apr 8 at 22:38

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