Re: [Discuss-gnuradio] Received Signal Power ?

[Kresimir Dabcevic]

On Fri, 02 Sep 2011 14:12:24 +0200, Kresimir Dabcevic <address@hidden> wrote:

>
>
>
> -----Original Message-----
> From: address@hidden [mailto:address@hidden]
> Sent: Fri 9/2/2011 11:55 AM
> To: address@hidden
> Cc: Kresimir Dabcevic
> Subject: RE: RE: [Discuss-gnuradio]  Received Signal Power ?
>Hi all,
>
> Thanks for the answer! But isn't there a functionality in the XCVR2450
> daughterboard, which already measures the RSSI value?
>
> Isn't there like a function which could output this value?
>

Yes, there is an onboard sensor, http://files.ettus.com/uhd_docs/manual/html/dboards.html#xcvr-2450 , but it produces HIGHLY inaccurate results. You can access its values with read_rssi().

> Secondly. Capturing the samples right at the output of the USRP,
> meaning within "gr.fft_filter_ccc" or maybe within the
> "gr.probe_avg_mag_sqrd_c"?

Just take the stream from the USRP and perform
10*LOG10(DECIMATE(SINGLE_POLE_IIR_FILTER(COMPLEX_TO_MAG**2(SIGNAL))))

via signal processing blocks (this is what Marcus Leech referred me to do, you could find that post somewhere in the archives).

Regards,
Kresimir