Re: Clock synchronization problem of modulated signal: How to set the parameters to make the synchronization effect better?

El 3/6/21 a las 12:12, Marcus Müller escribió:

>> then use "polyphase arbitrary resampler" for pulse shaping,
>
> Unusual choice! You'd almost always want to use an interpolating FIR filter for this.

Hi Marcus,

AFAIK the polyphase arbitrary resampler is a good choice when there is
not a simple n:m interpolation relationship between the symbol rate and
sample rate. I think this block implements what fred harris describes in
Section 7.5 of his book. In the end it is some kind of interpolating FIR
filter. You need to define your prototype filter correctly according to
your pulse shape, though.

I've used it successfully for the transmitter of a 32APSK modem:

https://destevez.net/2021/05/32apsk-narrowband-modem-for-qo-100/

Best,

Daniel.