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From: | Daniel Estévez |
Subject: | Re: Clock synchronization problem of modulated signal: How to set the parameters to make the synchronization effect better? |
Date: | Thu, 3 Jun 2021 19:46:44 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 |
El 3/6/21 a las 12:12, Marcus M??ller escribi??:
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.
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