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Re: [Discuss-gnuradio] USRP Tx Rate Conversion


From: Wireless Monster
Subject: Re: [Discuss-gnuradio] USRP Tx Rate Conversion
Date: Thu, 17 Apr 2008 11:11:53 -0400

Brian, Dan,

It is working now. Thanks again for your help.

One more basic "signal processing question" ... knowing that the input and output are complex (GMSK modulated signal), should I use complex or real coefficients for the resampler filter  (rational_resampler_ccc, vs. rational_resampler_ccf) ?

Regarding Ed, question on the LPF after the resampler, I am not sure... it does not seems to be needed... any clue?

Thanks!


On Tue, Apr 15, 2008 at 4:09 PM, Wireless Monster <address@hidden> wrote:
Brian, Dan,
Thank you very much for your help. It is clear now!
Rgds,


On Tue, Apr 15, 2008 at 4:05 PM, Dan Halperin <address@hidden> wrote:
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 At hat point can I send the samples (for example from a file with
> gr.file_source) and guarantee they will be treated as a 270.8333Ks/s stream?
> (assuming there will be enough samples to process)

No.  They will be treated like a 2Msps stream which is what you
interpolated your 270.8333Ksps stream to.  You will have interpolated
your original signal by exactly 96/13 which will give you a 2Msps
stream.

I think you and Brian are experiencing notational confusion with Ks/s. If you treat the post-processed signal as a 2 Msamples/sec signal then the output signal will be a 270.733 Ksyms/sec. I believe that the USRP settings you describe will do just that.

- -Dan
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