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Re: [Discuss-gnuradio] Dynamic range of USRP2-XCVR2450
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From: |
Marcus D. Leech |
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Subject: |
Re: [Discuss-gnuradio] Dynamic range of USRP2-XCVR2450 |
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Date: |
Sun, 24 Oct 2010 17:17:56 -0400 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.12) Gecko/20100907 Fedora/3.0.7-1.fc12 Thunderbird/3.0.7 |
On 10/24/2010 04:27 PM, Jorge Miguel wrote:
> I will have a look at the white papers from that manufacturers.
> From your words, I imagine that the noise generated by the ADC will
> set a limit in the noise floor at the input of the ADC, isn´t it?
Yes. The total signal power arriving at the A/D (signal+noise) must
exceed the effective
noise floor of the A/D by enough margin to allow "demodulation" of
your signal of
interest. Where "demodulation" is very loosely defined. Each
modulation technique has
its own SNR requirements. I do radio astronomy, where there's no
demodulation, per se.
In fact, most of the time my "signals" are *below* the total noise
floor of the receiving system.
But I have the very great advantage of being able to maximize
bandwidth and integration
time in order to "see" those below-the-noise-floor signals.
--
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org