I want to display an eye diagram for QPSK signals.
Has anyone implemented that? [snipped]
Yes. Here’s a screen shot of ours which is at
http://sedition.org.au/op25/wiki/HardwarePage
[scroll down to end of page]
For implementation in receivers, this code needs to be located after an
FM demodulator block as it operates on real (not complex) input.
Best Regards
Max