Re: 回复：the output of the "USRP Source"?

[Daniel Estévez]

El 24/5/21 a las 3:53, ???????? escribi??:
> My screenshot is in the attachment ,Is there a big difference between 
> the simulated channel of the "channel model" and the actual channel 
> connected via USRP? How can I adjust the parameters or add other modules 
> to recover the original signal?

Hi ????????,

Thanks for attaching the PDF screenshots.

I think that something that is missing from your RX flowgraph is an AGC. 
The Polyphase Clock Sync and Costas Loop (and maybe the CMA Equalizer, 
not sure on that one, really) assume that the signal is normalize to 
amplitude one. If this doesn't happen, these blocks will work badly.

Besides this problem, it might still happen that some of the loop 
parameters of your blocks are not very good for real life use, even if 
they work with the Channel Model block. If you continue having problems 
after adding an AGC, it might be a good idea to add more plots to your 
RX to check which stage does not work as expected.

Best,

Dani.

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