Re: [Discuss-gnuradio] Real Signal to I/Q Samples

[Tom Hendrick]

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 <address@hidden> wrote:

From: Marcus D. Leech <address@hidden>
Subject: Re: [Discuss-gnuradio] Real Signal to I/Q Samples
To: address@hidden
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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