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Re: [Discuss-gnuradio] samples/symbols CPFSK


From: Ed Criscuolo
Subject: Re: [Discuss-gnuradio] samples/symbols CPFSK
Date: Thu, 21 Jul 2016 18:42:59 -0400

Your flowgraph intrinsically has one symbol per sample in the data generation portion. You need a resampler just ahead of the throttle to interpolate in order to increase the number of samples per symbol. 

@(^.^)@ Ed
Sent from my iPhone

On Jul 21, 2016, at 3:15 PM, Olivier Goyette <address@hidden> wrote:

Hi all !

I've been working on this flowgraph for a while now and I've been able to pinpoint what is not working, but I don't understand how to resolve this so, that's why i'm asking for your guidance.

Take a look at the flowgraph i've joined. The thing that doesn't seem to be working on this setup is the samples/symbol in th CPFSK mod block.

When I set this parameter to 1 i'm able to retrieve my message at the file sink. So it tells me that what I did is okay in some way.

What is not working is when I set the same parameter to 6. At the beginning I wasn't using the rational resampler and it wasn't working. So I thought I would need something to "divide" the number of samples to retrieve each symbols. I tried it with the rational resampler block and set decimation to 6, but then, Daaaaaah......not working again.

There is something I can't work around here because I do not have sufficient knowledge about this samples/symbol thing.

I'd like to hear from you pals if you could give me a bit of information about how to make this work properly.

thank you !
<CPFSK.grc.png>
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