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Re: [Discuss-gnuradio] Polyphase Clock Synchronization with Matched Filt

From: Sylvain Munaut
Subject: Re: [Discuss-gnuradio] Polyphase Clock Synchronization with Matched Filter
Date: Mon, 27 Apr 2015 15:34:37 +0200


I am trying to use Polyphase Clock Synchronization (PCS) block to conduct timing synchronization for QPSK signal with half-sine pulse shaping. In the doxygen document of PCS, it says that the "taps" parameter could be the matched filter. Thus, I put the matched filter of half-sine pulse here, [0,sin(pi/4),1,sin(3*pi/4)]. However, the output is all 0. 

Is there anyone knows how to generate the "taps" parameter here?  Any suggestion would be appreciated. Thanks in advance.

I'm not an expert in all the details, but what I know is that the taps there need to be generated at "Filter Size" * "Sample Rate".

So I'd try something like [math.sin(math.pi*i/(32*4)) for i in range(32*4)]



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