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Altera_Forum's avatar
Altera_Forum
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11 years ago

BPSK Demodulation

Hello again, I am still struggling with BPSK demodulation :) OK, now I am trying to implement Costas Loop for carrier synchronization, which involves Inphase and Quadrature Phase paths. Inpha...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

I am sorry, it's my mistake... I didn't mention that after multiplication there is CIC filter... before RRC.

So these are the waveforms:

https://www.alteraforum.com/forum/attachment.php?attachmentid=10365

Basically, I am trying to design this loop:

https://www.alteraforum.com/forum/attachment.php?attachmentid=10366

Instead of LPF, I used CIC filters, as they do filtering and decimation at the same time. Am I wrong?

You are right, RRC has nothing to do with Costas Loop.