Run your signal into magnitude_squared -> integrate_with_decimation ->
k+log(10) . That will compute mean square power. Feed in a calibrated CW
tone, then offset k to match the calibrated value.
Lou
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Dear 김무연,
"RSSI" means "Received Signal Strength Indication" or "Index", and
isn't universally defined.
Either you're looking at a specific wireless comm standards that
defines that value, or you need to invent your own definition.
Please do your research on this and if you feel like it, we'd be
Hi allI want to ask somethingHow can I get RSSI of the received signalI use two computers and 2usrps n210 as a transmitters and 1 usrp as a receiverIn transmitter, I want to estimate the RSS or RSSI of the received signal per one periodAre there any blocks? or any methods to estimate the RSS or RSS
data type "float", I
have to use my own C program
covert the data type from "binary stream" to "ASCII".
Is there any similar block in GRC to achive File data type convert?
-- Original --
From: "Marcus M??lle";;
Date:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Hi Owenzhang,
welcome to the mailing list!
GRC is a tool to construct flow graphs of GNU Radio blocks; there is
no "math library" in GRC, but there are blocks that perform
mathematical operations. Since you are probably looking for
sqrt(|x|²), try us
On 30/03/2011 8:33 AM, Fengyuan Gong wrote:
Shouldn't the second one also read ADC value on the
RFX900/1200/1800/2200/2400 and then calculate out the analog signal
strength?
You should also be aware that the analog RSSI input is the signal power
over the analog-detector bandwidth in the demodul
On 30/03/2011 8:33 AM, Fengyuan Gong wrote:
Shouldn't the second one also read ADC value on the
RFX900/1200/1800/2200/2400 and then calculate out the analog signal
strength?
That function just does a read of the AUX_ADC (apparently a 10-bit
aux_adc on USRP1), it has no notion that it's an RSSI
Shouldn't the second one also read ADC value on the
RFX900/1200/1800/2200/2400 and then calculate out the analog signal
strength?
On Wed, Mar 30, 2011 at 12:46 AM, Matt Ettus wrote:
> On 03/25/2011 07:52 PM, Fengyuan Gong wrote:
> > Hi, All,
> > I am a bit confused about RSSI calculation.
> > In
On 03/25/2011 07:52 PM, Fengyuan Gong wrote:
> Hi, All,
> I am a bit confused about RSSI calculation.
> In the given verilog code
> at
> http://code.ettus.com/redmine/ettus/projects/fpga/repository/revisions/8b377a9d6d0ad281474a8dbff49ea3b093178b28/entry/usrp2/sdr_lib/rssi.v
>
> I can see RSSI i
On 03/25/2011 10:52 PM, Fengyuan Gong wrote:
Hi, All,
I am a bit confused about RSSI calculation.
In the given verilog code at
http://code.ettus.com/redmine/ettus/projects/fpga/repository/revisions/8b377a9d6d0ad281474a8dbff49ea3b093178b28/entry/usrp2/sdr_lib/rssi.v
I can see RSSI is defined b
Hi, All,
I am a bit confused about RSSI calculation.
In the given verilog code at
http://code.ettus.com/redmine/ettus/projects/fpga/repository/revisions/8b377a9d6d0ad281474a8dbff49ea3b093178b28/entry/usrp2/sdr_lib/rssi.v
I can see RSSI is defined by 16 bits.
But in usrp_prims_common.cc, function
> HI,
>
> I am working on the USRP2 and gnuradio. And I want to use them to get
> the rssi (like bluetooth). Through reading the former posts for rssi
> on GNU Radio mailing list, using the rssi.v is the solution. But I
> still have some questions about the rssi.v. I am a fresh man and
> looking fo
HI,
I am working on the USRP2 and gnuradio. And I want to use them to get the
rssi (like bluetooth). Through reading the former posts for rssi on GNU
Radio mailing list, using the rssi.v is the solution. But I still have some
questions about the rssi.v. I am a fresh man and looking for some helps
On 04/27/2010 06:07 PM, bin zan wrote:
Thanks Devin and Matt.
From your reply can I say if I don't use AGC and with a fixed value of
gain, then I can calculate the RSSI value.
Yes
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Thanks Devin and Matt.
>From your reply can I say if I don't use AGC and with a fixed value of gain,
then I can calculate the RSSI value.
Bin Zan
On Tue, Apr 27, 2010 at 3:26 PM, devin kelly wrote:
> Hello Bin,
>
> My group considered doing this about 4-5 months ago. Things may have
> changed
On 04/27/2010 09:04 AM, bin zan wrote:
Hello,
Anyone know if it is correct to roughly estimate RSSI
information from I/Q values. For example is it correct to say RSSI of a
message is equal to 10log10(I^2-Q^2). Otherwise, what is the correct way
to obtain RSSI value in gnuradio?
You wou
Hello Bin,
My group considered doing this about 4-5 months ago. Things may have
changed now, but at that time it was not possible (or at least not straight
forward to me) to get the gain from the AGC.
>From my understanding, the AGC (automatic gain control) makes getting RSSI
readings difficult
Hello,
Anyone know if it is correct to roughly estimate RSSI information
from I/Q values. For example is it correct to say RSSI of a message is equal
to 10log10(I^2-Q^2). Otherwise, what is the correct way to obtain RSSI value
in gnuradio?
Thanks,
Bin
Winlab
Hi,
> Hello
>
> I would like to be able to measure the received signal power by the
> USRP2's antenna at any compatible frequency. My idea is store the value
> of the received signal power in a variable, which I'll use to determine
> if the channel is busy or not (based on a configurable thresho
Hello
I would like to be able to measure the received signal power by the
USRP2's antenna at any compatible frequency. My idea is store the value
of the received signal power in a variable, which I'll use to determine
if the channel is busy or not (based on a configurable threshold).
I've taken a
On Thu, Feb 11, 2010 at 12:56 AM, wrote:
> Hi,
> In a lab scenario , RSSI may not be much affected by multipath signals.
> and to the other question u asked,
> I only want to plot BER against some received signal. It can be either RSSI
> or SNR or anything. But I need some reference. If u have an
On Mon, Feb 8, 2010 at 3:21 AM, wrote:
> Hi Jonnathan,
> Can u please share the programs which does the RSSI computation . I am using
> the RFX2400 board. I need to plot BER against Receiver SNR. So, RSSI is
> required.
I can understand that you'd like an RSSI measurement, but while they
may be
On 02/02/2010 01:13 AM, amarnath alapati wrote:
hi friends,
I need to measure the Received signal strength. I am using
the programs in gnuradio/examples/python/digital/ folder. I am
transmitting at one end using benchmark_tx.py and receiving at the other
end with benchmark_rx.py. I n
Hi Jonnathan,
Can u please share the programs which does the RSSI computation . I am
using the RFX2400 board. I need to plot BER against Receiver SNR. So, RSSI
is required.
Thank you
Amarnath
On Feb 8, 2010 1:21pm, Matt Ettus wrote:
On 02/02/2010 01:13 AM, amarnath alapati wrote:
h
hi friends,
I need to measure the Received signal strength. I am using the
programs in gnuradio/examples/python/digital/ folder. I am transmitting at
one end using benchmark_tx.py and receiving at the other end with
benchmark_rx.py. I need to calculate the bit error rate and plot it aga
On Fri, Jul 10, 2009 at 12:21 PM, Eric Lo wrote:
> But is there any good method to estimate SNR or RSSI ?
Both are pretty much unrelated.
SNR you will be able to get based on your demodulation on the host.
RSSI is based on the gain settings you choose for your amplifiers.
The incoming power as s
But is there any good method to estimate SNR or RSSI ?
Regards,
Eric Lo
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On Fri, Jul 10, 2009 at 11:05:17AM +0800, Eric Lo wrote:
> Is it possible to obtain rssi value in usrp2 with rcv2400 ?
No, sorry. Not with the current code.
Eric
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Is it possible to obtain rssi value in usrp2 with rcv2400 ?
Regards,
Eric Lo
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Hi Stefan,
There has been constant back and forth between a lot of us on the list
about what exactly should be in the RSSI field. I'm not the one who
wrote the RSSI calculation, but myself and another student are
responsible for the in-band implementation and what bits get put into
the heade
Hi
after looking at the verilog code for some time, these are my results:
in module usrp_inband_usb, for each of the four aux adcs, the signal level is
read from the adc and an gliding average of the rssi and an saturation
indicator is is calculated. The rssi value is put but into the lower 16
Hi,
i'm working on to calculate RSSI value via software. I'm using various methods
which give me the same result, but it depends on decimation value. The
behaviour is not linear changing decimation factor:
decimatorRSSI
28 220.18217468
30 354.19775391
32
George Nychis wrote:
> I think you're right Jonathan, for performing carrier sense in the
> FPGA, we really do not need it in dB. Calculating the average to
> determine a threshold will get the job done with less the hassle.
You may want to implement two thresholds, one for rising power and one
PS. We have a hacked up version of carrier sense working right now :)
We're just using the C/S read register method to get a couple RSSI
readings, computing an average, then writing the threshold to a register
on the FPGA.
The packets are then marked with a carrier sense flag, which we stole
Eric, we want feedback from you on this one :)
I think you're right Jonathan, for performing carrier sense in the FPGA,
we really do not need it in dB. Calculating the average to determine a
threshold will get the job done with less the hassle. And right, if the
host really wants it in dB, i
George Nychis wrote:
> We want to compute the RSSI in dB on the FPGA, we're not even
> interested in the FPGA responding back with the RSSI at this point.
Okay, but--why do you need units of dB? This is in the log domain, so
at some point on the FPGA you'll need to take a logarithm of an
amplitu
Eric Blossom wrote:
> For now, don't worry about getting it into dB on the FPGA.
> The representation can be manipulated on the host.
>
OK, so how do I get post-ADC rssi out of the USRP for any arbitrary
daughtercard?
My radio astronomy receiver could benefit from this, especially if the
RSSI i
On Thu, Aug 16, 2007 at 12:36:05PM -0400, George Nychis wrote:
> Okay, so I'm a little bit intimidated, I'm not too familiar at this level.
>
> So I'm going to ask for some help me through with baby step questions :)
>
> We managed to get reading/writing to some unused registers working
> throug
Okay, so I'm a little bit intimidated, I'm not too familiar at this level.
So I'm going to ask for some help me through with baby step questions :)
We managed to get reading/writing to some unused registers working
through in-band C/S packets. So, we're ready to use this code to pass
informat
There are many forms of RSSI measurement between the daughterboards and
FPGA.
The RFX900, 1200, 1800, and 2400 (but not the 400) have analog RSSI
measurement at baseband. By reading one of the low speed ADCs in the
9862 you can get the signal level at baseband. To translate that to an
RF leve
Zhuocheng Yang wrote:
> Hi guys:
>
> I noticed that in the adc_interface, there are registers called rssi_0,
> rssi_1, rssi_2, and rssi_3. All of which are 32 bits. However, according to
> the header format:
> http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/doc/inband-signaling-usb
> The rss
George Nychis wrote:
> Thanks for all the responses and info on the RSSI. I'm following most
> of it, but will probably have a bunch more questions the further we get
> in to it.
>
> The reason we are poking at this is because we are interested in using
> it for carrier sense. I agree that repo
Johnathan Corgan wrote:
Brian Padalino wrote:
I haven't taken a look at the daughterboards, but do they all use
different amplifiers and different numbers of stages?
They are mostly different. All the RFX boards are similar, but the RFX
uses a different front end from the TVRX, DBSRX and t
Brian Padalino wrote:
> I haven't taken a look at the daughterboards, but do they all use
> different amplifiers and different numbers of stages?
They are mostly different. All the RFX boards are similar, but the RFX
uses a different front end from the TVRX, DBSRX and the new boards still
in de
On 8/7/07, Johnathan Corgan <[EMAIL PROTECTED]> wrote:
> It's a "digital RSSI" value, meaning it's based on the output of the ADC
> and not the true RF power at the antenna. Furthermore, it's really a
> single pole low pass averaging filter on the absolute value of the ADC
> value, with no way to
Brian Padalino wrote:
> Is this really the RSSI - or should the RSSI actually be a function of
> the amount of gain or attenuation in the RF stages? I am sure it gets
> pretty difficult calculating an estimate for the amount of power at
> the antenna.
It's a "digital RSSI" value, meaning it's ba
On 8/7/07, Zhuocheng Yang <[EMAIL PROTECTED]> wrote:
> Hi guys:
>
> I noticed that in the adc_interface, there are registers called rssi_0,
> rssi_1, rssi_2, and rssi_3. All of which are 32 bits. However, according to
> the header format:
> http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/doc
Hi guys:
I noticed that in the adc_interface, there are registers called rssi_0, rssi_1,
rssi_2, and rssi_3. All of which are 32 bits. However, according to the header
format:
http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/doc/inband-signaling-usb
The rssi should be 6 bits. Do I just use t
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