Measuring noise power

GNU Radio
1

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

2

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

Kyungtae

Discuss-gnuradio mailing list
[email protected]
Discuss-gnuradio Info Page

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.

3

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

[mailto:discuss-gnuradio-bounces+kyungtae=removed_email_address@domain.invalid] *On
to test with usrp_spectrum_sense.py, however I am not sure the power
Discuss-gnuradio mailing list
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.

4

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=removed_email_address@domain.invalid
[mailto:discuss-gnuradio-bounces+kyungtae=removed_email_address@domain.invalid] On
Behalf Of Marcus D. Leech
Sent: Monday, January 18, 2010 1:06 PM
To: [email protected]
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

Discuss-gnuradio mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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.

5

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:[email protected]]
Sent: Monday, January 18, 2010 2:11 PM
To: Kyungtae Kim
Cc: [email protected]
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=removed_email_address@domain.invalid
[mailto:discuss-gnuradio-bounces+kyungtae=removed_email_address@domain.invalid] On
Behalf Of Marcus D. Leech
Sent: Monday, January 18, 2010 1:06 PM
To: [email protected]
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

Discuss-gnuradio mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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.