I have a question about carrier recovery in demodulation?

hegangben

I have a question about carrier recovery in demodulation? [Copy link]

In carrier recovery, the results obtained by the DD, RC-DD, and polarity judgment algorithms are phase. Why do the papers always use the frequency difference curve after loop filtering? It seems that the DD, RC-DD, and polarity judgment algorithms can detect the frequency, but the results of the algorithms are phase?

falconcd

I don't understand either, hey :(