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From: | Röpfl , Leonhard |
Subject: | Sync Problem with 256-QAM with USRP B2xx in GRC |
Date: | Mon, 20 Sep 2021 07:10:48 +0000 |
Dear GNU Radio Community,
since a couple of months i try to get a 256-QAM Transmission over Air to work.
Now i reached a dead point, because i could not get the receiver locked on the phase of the QAM.
4-QAM is not a Problem, it works fine like it is described in the Tutorial.
I have tried Polyphase Clock Sync, Costas Loop ect. (what ever i found under Synchronizers) in quite various combination, but this leads to nothing.
My guess is that Costas Loop is not working for higher QAM anyway.
I did not find any description, how this could be done right, neither in the Internet (Google, Youtube) nor in the library of our University.
Helpful would be:
- a generic description or example how this is done
- a reference one a book or paper which describe that (even if this book is expensive)
- link to an online-resource
Thanks in advance
Best regards
Leonhard
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