You did need to use a known calibration source. You’d need to build a calibration table over your expected operating parameter space, including:
Frequency Gain Sample rate Analog bandwidth setting (if applicable) The I/Q samples will be linearly proportional over a goodly chunk of the input dynamic range. They will differ from linear at the bottom and top of the range. Lab instruments line spectrum analysers typically have this done at the factory, using expensive calibration sources. They must be recalibrated regularly. Sent from my iPhone > On Sep 8, 2020, at 5:08 PM, Snehasish Kar via USRP-users > <usrp-users@lists.ettus.com> wrote: > > > Hello Marcus > > Just had a query in this context, how do we calculate the Power or Received > signal strength then from the IQ samples. > > Regards > Snehasish > > Get Outlook for iOS > From: USRP-users <usrp-users-boun...@lists.ettus.com> on behalf of Martin > Braun via USRP-users <usrp-users@lists.ettus.com> > Sent: Tuesday, September 8, 2020 8:53:57 PM > To: usrp-users@lists.ettus.com <usrp-users@lists.ettus.com> > Subject: Re: [USRP-users] USRP sensitivity > > On 9/5/20 4:59 PM, Koyel Das (Vehere) via USRP-users wrote: > > NI told me magnitude of IQ samples received in usrp is the voltage in volts. > > Can you point us to where you got that information? > > For the list archives: UHD 4.0 will have the ability to map digital > signals to power levels for X3x0 and B200 series, if you can provide > your own calibrated gear. > > --M > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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