USRP Noise Floor
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USRP Noise Floor
by Pelin Yalcin
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Dear All,
I would like to learn the noise floor of a receiver which uses USRP, XCVR2450 and VERT2450. Namely, when usrp_fft.py is run with no incoming signal present in an indoor environment, what is the expected noise level? Thanks in advance. Regards, Pelin Yalcin Research Assistant Center for Wireless Communications and Signal Processing Research (CWCSPR) New Jersey Institute of Technology _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
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Re: USRP Noise Floor
by Matt Ettus
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N. Pelin Yalcin wrote:
> Dear All, > > I would like to learn the noise floor of a receiver which uses USRP, > XCVR2450 and VERT2450. > Namely, when usrp_fft.py is run with no incoming signal present in an > indoor environment, what is the expected noise level? > Thanks in advance. The noise figure is between 6 and 10 dB Matt _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
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Re: USRP Noise Floor
by Tim Pearce-2
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I've had quite a few problems which I think are caused by poor phase noise on the XCVR2450 -- it's an all in one chip with a local oscillator on board etc - the 2400 appears quite a bit better (20dB if I remember correctly!)
The schematics are in an odd place for this board - I could only find a link under the USRP1 page http://gnuradio.org/trac/attachment/wiki/USRP/xcvr2450_rev1.1.pdf Tim On Tue, Oct 27, 2009 at 6:41 AM, N. Pelin Yalcin <npy3@...> wrote: Dear All, _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
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Re: USRP Noise Floor
by Matt Ettus
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Yes, because the XCVR2450 is highly integrated, its phase noise will not be as good as the RFX2400. I don't think it is quite 20dB worse, but maybe 10-15 dB. Matt Tim Pearce wrote: > I've had quite a few problems which I think are caused by poor phase > noise on the XCVR2450 -- it's an all in one chip with a local oscillator > on board etc - the 2400 appears quite a bit better (20dB if I remember > correctly!) > > The schematics are in an odd place for this board - I could only find a > link under the USRP1 page > http://gnuradio.org/trac/attachment/wiki/USRP/xcvr2450_rev1.1.pdf > > Tim > > On Tue, Oct 27, 2009 at 6:41 AM, N. Pelin Yalcin <npy3@... > <mailto:npy3@...>> wrote: > > Dear All, > > I would like to learn the noise floor of a receiver which uses USRP, > XCVR2450 and VERT2450. > Namely, when usrp_fft.py is run with no incoming signal present in > an indoor environment, what is the expected noise level? > Thanks in advance. > > Regards, > Pelin Yalcin > Research Assistant > Center for Wireless Communications and Signal Processing Research > (CWCSPR) > New Jersey Institute of Technology > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@... <mailto:Discuss-gnuradio@...> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > ------------------------------------------------------------------------ > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@... > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
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