Thank you Marcus,
For the reverse process what would I use to go from I and Q samples with the
USRP tuned to a real signal at the proper center frequency?
I'm
guessing the signal should remain in complex form and be upshifted
using a multiplier, and then some transform (not sure which one in GRC)
Thank you again! - Tom
--- On Tue, 6/21/11, Marcus D. Leech <mle...@ripnet.com> wrote:
From: Marcus D. Leech <mle...@ripnet.com>
Subject: Re: [Discuss-gnuradio] Real Signal to I/Q Samples
To: discuss-gnuradio@gnu.org
Date: Tuesday, June 21, 2011, 11:56 PM
On 06/21/2011 05:33 PM, Tom Hendrick wrote:
Hello all, I am
helping a colleague with the USRP center frequency tuning
functionality and it is my understanding the signal must
contain I and Q values centered at 0Hz.
A real valued signal is generated independently by another
program and is fed to a GRC script. Is it easy/possible
to make a GRC script downshift the signal to 0 Hz and
convert to I and Q values or is there perhaps an example
of this already?
Thank you in advance- Tom
You can use a Hilbert transform to turn it into a complex-valued
signal.
You can then mix it using a complex signal source and a multipler to
downshift it.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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