Zs, SNR is something that depends on your signal. We can't tell you what signal you have. The number I can give you is the Noise Figure of the SBX at room temperature. It's something that depends on both gain and frequency. You can find the measurement data under [1]. Together with the normal thermal noise power spectral density and your receiver bandwidth, you can calculate a maximum SNR. Also take quantization noise into account, and don't forget that you're oversampling.
All these effects depend on how you parameterize your transmission. Best regards, Marcus [1] http://files.ettus.com/performance_data/sbx/ On 03/01/2016 01:58 PM, w xd wrote: > Hi, > > And I want to know the "phase noise variance" of our instrument?Thanks > so much. > > > 2016-03-01 20:50 GMT+08:00 w xd <wxd920...@gmail.com > <mailto:wxd920...@gmail.com>>: > > Hi, > > I used the USRP N210 and sbx board.What is the dynamic range of > the instrument?Namely the maximum SNR?Thanks so much. > > Best Regards, > zs > > 2016-03-01 19:58 GMT+08:00 Marcus Müller <marcus.muel...@ettus.com > <mailto:marcus.muel...@ettus.com>>: > > I think that question answers itself if you consider what SNR is. > > Best regards, > Marcus > > > On 01.03.2016 12:34, w xd wrote: >> Thanks so much. >> >> In this case,I just change the gain of the transmitter,will >> be change the snr of the receiver? >> >> Thanks. >> >> 2016-03-01 19:02 GMT+08:00 Marcus Müller >> <marcus.muel...@ettus.com <mailto:marcus.muel...@ettus.com>>: >> >> Dear zs, >> >> > I want to change the ratio of power of the received >> signal to power of the noise. >> >> well, improving receiver SNR is the *core* problem of all >> wireless communication. Unless you just add noise (on the >> receiver or the transmitter side, depending on whether >> you want your noise to be channel-shaped or not), there's >> your whole digital communication knowledge you can apply >> (matched filtering, oversampling, coding gain, >> preselection filtering...). >> >> > And I want to change the gain of the transmitter. >> Well, then do that. The usrp_sink block has a TX gain >> setting, and all daughterboards (aside from the Basic*, >> LF* and TVRX* boards) have adjustable gain: use the >> set_tx_gain(gain) method, or if you're using GRC, look >> into the "RF settings" tab. >> >> Best regards, >> Marcus >> >> >> On 01.03.2016 09:56, w xd wrote: >>> Sorry for that. >>> >>> I'm now using the USRP N210,one transmitter and one >>> receiver.I want to change the ratio of power of the >>> received signal to power of the noise.And I want to >>> change the gain of the transmitter. >>> >>> 2016-03-01 16:45 GMT+08:00 Marcus Müller >>> <marcus.muel...@ettus.com >>> <mailto:marcus.muel...@ettus.com>>: >>> >>> Dear zs, >>> >>> your question is absolutely unclear. SNR of what? >>> What instrument? TX or RX, or simulation? >>> >>> Best regards, >>> Marcus >>> >>> >>> On 01.03.2016 07:06, w xd wrote: >>>> Hi, >>>> >>>> I want to change the SNR through gnuradio.Can I >>>> realize it by just change the gain of the >>>> gnuradio?Or the instrument is fixed,and the snr >>>> can't be change? >>>> >>>> Thanks so much. >>>> >>>> Best Regards, >>>> zs >>>> >>>> >>>> _______________________________________________ >>>> Discuss-gnuradio mailing list >>>> Discuss-gnuradio@gnu.org >>>> <mailto:Discuss-gnuradio@gnu.org> >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> <mailto:Discuss-gnuradio@gnu.org> >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >>> >> >> > > >
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