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Altera_Forum
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11 years ago

Costas Loop oscillates in ModelSim while locks in MATLAB!

Hello again, I have designed a Costas Loop in MATLAB and it simulates very well... locking and recovering the carrier. Here are the results: http://www.alteraforum.com/forum/attachment.php?...
Altera_Forum's avatar
Altera_Forum
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11 years ago

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Regarding rrc/cic I don't know about your chain but normally RRC is first in tx, last in Rx.

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Brilliant! One confusion vanished.

I am not sure how to plot constellations in Modelsim but this is the output of I_RRC with no phase offset in both tx and rx, both synchronized and loop is deactivated.

http://www.alteraforum.com/forum/attachment.php?attachmentid=10466&stc=1