RE: [Discuss-gnuradio] measuring noise power

If you mean usrp_spectrum_sense.py and usrp_fft.py, then, usrp_spectrum_sense.py in Gnuradio/gnuradio-examples/python/usrp, usrp_fft.py in Gnuradio/gr-utils/src/python/, if your install gnuradio is Gnuradio.

 

Thanks,

Kyungtae

 

From: Marcus D. Leech [mailto:mleech@ripnet.com]
Sent: Monday, January 18, 2010 2:11 PM
To: Kyungtae Kim
Cc: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] measuring noise power

 

On 01/18/2010 01:22 PM, Kyungtae Kim wrote:

Thanks, I tried to find the example, however I couldn’t in the gnuradio directories. Could you let me know where I can find the sample code?

 

Thanks,

Kyungtae

 

From: discuss-gnuradio-bounces+kyungtae=nec-labs.com@gnu.org [mailto:discuss-gnuradio-bounces+kyungtae=nec-labs.com@gnu.org] On Behalf Of Marcus D. Leech
Sent: Monday, January 18, 2010 1:06 PM
To: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] measuring noise power

 

On 01/18/2010 12:36 PM, Kyungtae Kim wrote:

Hi,

 

I am looking for a way to measure noise power through usrp1. I tried to test with usrp_spectrum_sense.py, however I am not sure the power values measured is correct, because it is not same values shown as the graph from usrp_fft.py. I wonder if someone helps me out for this.

 

Thanks,

Kyungtae

 

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Try building a little app using GRC using gr_complex_to_mag_squared(), then run it through an
  averager. 

Or the

gr_probe_avg_mag_sqrd_c()

Block.  Pretty straightforward.  Should be quite accurate.

gr-radio-astronomy/src/python/usrp_ra_receiver.py   computes total power, using a long-term averager.