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Re: [Discuss-gnuradio] Measuring RSSI on USRPN200
From: |
Marcus D. Leech |
Subject: |
Re: [Discuss-gnuradio] Measuring RSSI on USRPN200 |
Date: |
Sat, 22 Oct 2011 21:58:42 -0400 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 |
On 22/10/11 09:41 PM, Bonee Soibam wrote:
> Hi ,
> I am trying to measure the RSSI on an usrpn200 which acts as a
> receiver. i have used the rx_ascii_dft.py and uhd_fft.py both and i
> have made a host of measurements but the received power is not
> reliable for different transmit powers at different amplitude of
> 0.25,0.50 and 0.85 (which i took randomly ) .. the channel
> attenuation is not less for more transmit power in short ..
>
> Is there any other way to measure the RSSI values besides these two
> apps uhd_fft.py and rx_ascii_dft.py ?i have run a set of measurements
> and the resultant received powers are not reliable at all ,according
> to me . i am still an amateur regarding this .
> how about running the rssi.v verilog file ? .. will i be able to
> extract the rssi values directly from the fpga ?
>
> Anticipating your feedback in earnest
> Bonee
>
Received power is proportional to the average of the square of the I and
Q voltages. If you
use a Complex-to-Mag**2 block, followed by a low-pass filter, you'll
get an (uncalibrated!!)
received-power estimate.
An increase in *voltage* magnitude from 0.25 to 0.5 should create a
received power increase of
6dB, since doubling the voltage increases the *power* by a factor of 4
(6dB), assuming a reasonably
linear channel between TX and RX.
You haven't said what your test setup is: antennae, daughtercards, etc.
What are you using to transmit? Is it another USRP device, or something
else?
--
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
- [Discuss-gnuradio] Measuring RSSI on USRPN200, Bonee Soibam, 2011/10/22
- Re: [Discuss-gnuradio] Measuring RSSI on USRPN200,
Marcus D. Leech <=
- Message not available
- Re: [Discuss-gnuradio] Measuring RSSI on USRPN200, Marcus D. Leech, 2011/10/23
- Re: [Discuss-gnuradio] Measuring RSSI on USRPN200, Vanessa Gardellin, 2011/10/26
- Re: [Discuss-gnuradio] Measuring RSSI on USRPN200, Marcus D. Leech, 2011/10/26
- Re: [Discuss-gnuradio] Measuring RSSI on USRPN200, Vanessa Gardellin, 2011/10/26
- Re: [Discuss-gnuradio] Measuring RSSI on USRPN200, Marcus D. Leech, 2011/10/26