Re: [Discuss-gnuradio] RSSI

2018-04-19 Thread Louis Brown
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 ___ Discuss-gnuradio mailing list Discuss-gnurad

Re: [Discuss-gnuradio] RSSI

2018-04-19 Thread CEL
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

[Discuss-gnuradio] RSSI

2018-04-19 Thread 김무연
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

Re: [Discuss-gnuradio] RSSI (was: Re: Math library) &&question about "File Sink"

2014-03-19 Thread ????
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:

Re: [Discuss-gnuradio] RSSI (was: Re: Math library)

2014-03-19 Thread Marcus Müller
-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

Re: [Discuss-gnuradio] RSSI calculation

2011-03-30 Thread Marcus D. Leech
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

Re: [Discuss-gnuradio] RSSI calculation

2011-03-30 Thread Marcus D. Leech
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

Re: [Discuss-gnuradio] RSSI calculation

2011-03-30 Thread Fengyuan Gong
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

Re: [Discuss-gnuradio] RSSI calculation

2011-03-29 Thread Matt Ettus
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

Re: [Discuss-gnuradio] RSSI calculation

2011-03-26 Thread Marcus D. Leech
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

[Discuss-gnuradio] RSSI calculation

2011-03-25 Thread Fengyuan Gong
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

Re: [Discuss-gnuradio] rssi question

2010-09-30 Thread Marcus D. Leech
> 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

[Discuss-gnuradio] rssi question

2010-09-30 Thread lion lion
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

Re: [Discuss-gnuradio] RSSI estimation

2010-04-27 Thread Matt Ettus
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 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://li

Re: [Discuss-gnuradio] RSSI estimation

2010-04-27 Thread bin zan
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

Re: [Discuss-gnuradio] RSSI estimation

2010-04-27 Thread Matt Ettus
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

Re: [Discuss-gnuradio] RSSI estimation

2010-04-27 Thread devin kelly
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

[Discuss-gnuradio] RSSI estimation

2010-04-27 Thread bin zan
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

Re: [Discuss-gnuradio] RSSI measurement / questions

2010-04-26 Thread Christoph Thein
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

[Discuss-gnuradio] RSSI measurement / questions

2010-04-26 Thread Juan Ramon Gutierrez Agullo
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

Re: Re: Re: [Discuss-gnuradio] RSSI Measurement--

2010-02-11 Thread Brian Padalino
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

Re: Re: [Discuss-gnuradio] RSSI Measurement--

2010-02-10 Thread Brian Padalino
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

Re: [Discuss-gnuradio] RSSI Measurement--

2010-02-10 Thread Matt Ettus
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

Re: Re: [Discuss-gnuradio] RSSI Measurement--

2010-02-08 Thread amarnath . alapati
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

[Discuss-gnuradio] RSSI Measurement--

2010-02-02 Thread amarnath alapati
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

Re: [Discuss-gnuradio] RSSI value in USRP2

2009-07-10 Thread Brian Padalino
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

Re: [Discuss-gnuradio] RSSI value in USRP2

2009-07-10 Thread Eric Lo
But is there any good method to estimate SNR or RSSI ? Regards, Eric Lo ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

Re: [Discuss-gnuradio] RSSI value in USRP2

2009-07-10 Thread Eric Blossom
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 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/

[Discuss-gnuradio] RSSI value in USRP2

2009-07-09 Thread Eric Lo
Is it possible to obtain rssi value in usrp2 with rcv2400 ? Regards, Eric Lo ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio

Re: [Discuss-gnuradio] RSSI value in inband code

2008-11-14 Thread George Nychis
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

[Discuss-gnuradio] RSSI value in inband code

2008-11-14 Thread Stefan Brüns
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

[Discuss-gnuradio] RSSI Value

2007-09-26 Thread pilla
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

Re: [Discuss-gnuradio] rssi questions

2007-08-16 Thread Johnathan Corgan
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

Re: [Discuss-gnuradio] rssi questions

2007-08-16 Thread George Nychis
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

Re: [Discuss-gnuradio] rssi questions

2007-08-16 Thread George Nychis
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

Re: [Discuss-gnuradio] rssi questions

2007-08-16 Thread Johnathan Corgan
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

Re: [Discuss-gnuradio] rssi questions

2007-08-16 Thread Marcus Leech
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

Re: [Discuss-gnuradio] rssi questions

2007-08-16 Thread Eric Blossom
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

Re: [Discuss-gnuradio] rssi questions

2007-08-16 Thread George Nychis
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

Re: [Discuss-gnuradio] rssi questions

2007-08-09 Thread Matt Ettus
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

Re: [Discuss-gnuradio] rssi questions

2007-08-09 Thread Matt Ettus
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

Re: [Discuss-gnuradio] rssi questions

2007-08-08 Thread Johnathan Corgan
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

Re: [Discuss-gnuradio] rssi questions

2007-08-07 Thread George Nychis
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

Re: [Discuss-gnuradio] rssi questions

2007-08-07 Thread Johnathan Corgan
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

Re: [Discuss-gnuradio] rssi questions

2007-08-07 Thread Brian Padalino
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

Re: [Discuss-gnuradio] rssi questions

2007-08-07 Thread Johnathan Corgan
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

Re: [Discuss-gnuradio] rssi questions

2007-08-07 Thread Brian Padalino
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

[Discuss-gnuradio] rssi questions

2007-08-07 Thread Zhuocheng Yang
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