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Re: [Discuss-gnuradio] MIMO Question

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] MIMO Question
Date: Fri, 14 Aug 2009 17:15:42 -0700
User-agent: Mutt/1.5.18 (2008-05-17)

On Fri, Aug 14, 2009 at 04:55:56PM -0400, Bruce McGuffin wrote:
> A while ago (Nov. 14, 2008) Matt talked about using a USRP2 with
> two antennas and two external radio receivers driving the basicRx.
> My question is, is it possible to do that if the external radio IF and
> bandwidth are too high to sample at 25 MHz without mixing the
> signal to a lower freqeuncy first? I'm concerned that the reference
> frequency into the mixer is probably complex, and the mixing process
> will wind up putting energy from both formerly real signals onto each
> of the mixer outputs. Is that true, and if so is there a way around it
> that is already implemented? What gnuRadio modules would I use?
> Thanks
> Bruce


All of this depends on the center of your IF and how wide it is.
If the numbers are right, bandpass sampling definitely works.
The USRP2 samples at 100 MS/s.

What's your IF freq?
How wide is it?


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