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Re: [Discuss-gnuradio] PROBLEM WITH USRP1 (A newer problem)
From: |
Josh Blum |
Subject: |
Re: [Discuss-gnuradio] PROBLEM WITH USRP1 (A newer problem) |
Date: |
Fri, 13 Apr 2012 08:15:53 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120310 Thunderbird/11.0 |
> We tried to introduce a channel model instead of the USRPs in our system,
> and we think that the problem is in the frequency offset. When frequency
> offset of the channel model is zero, everything is safe. When it is
> increased a little, the scope displays nothing.
>
> If you really think that the problem is in the frequency offset, please let
> us know how to combat that problem!
>
Have you observed the received spectrum? Is there an offset?
http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#I-have-two-USRPs-and-when-I-transmit-on-one-and-receive-on-the-other-at-the-same-frequency-I-get-an-offset
Also, you can just increase the symbol rate. So, despite the frequency
shift, your signal still makes it into the demodulator's passband.
-Josh