[Discuss-gnuradio] Status of GNURadio + GPU (specifically CUDA)
I noticed there was some work in this area being done by Martin Dudok van Heel in the developers branch of the repository. Can anyone comment on what has been done so far in this area and what kind of speeds they are getting now? Thanks in advance, Isaac -- View this message in context: http://www.nabble.com/Status-of-GNURadio-%2B-GPU-%28specifically-CUDA%29-tp22630060p22630060.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Simple USRP Interface Code
Hi everyone, I was wondering if anyone has written a small C++ application which is the bare bones required to interface with the URSP. Thanks in advanced, Isaac -- View this message in context: http://www.nabble.com/Simple-USRP-Interface-Code-tp22583894p22583894.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Hardware Schematics
I have heard that these are available for the USRP. Is this true? If so, where can I find them? Thanks in advance, Isaac -- View this message in context: http://www.nabble.com/Hardware-Schematics-tp22078901p22078901.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] OpenBTS Technical Report
I am looking for the openBTS webpage that had the technical details of the 2008 burning man experiment on them. Things like: - 7 simultaneous phone calls at 50% CPU - imsi filtering when they first started up Isaac -- View this message in context: http://www.nabble.com/OpenBTS-Technical-Report-tp22060856p22060856.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] OpenBTS Technical Repor:
I am looking for the openBTS webpage that had the technical details of the 2008 burning man experiment on them. Things like -- View this message in context: http://www.nabble.com/OpenBTS-Technical-Repor%3A-tp22060820p22060820.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Customization of FFT display via C or C++
Is it possible to modify the existing FFT Graphical Sink code to display time domain data on user defined axis. I would like to create some custom axis plots that display the PSD of the signal and optionally allow the user to retune, decimate, and subband tune by right mouse clicking and selecting an option from the menu. Thanks in advanced -- View this message in context: http://www.nabble.com/Customization-of-FFT-display-via-C-or-C%2B%2B-tp20961688p20961688.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] US Spectrum Allocation Details
Hi, I am looking for a detailed spectrum allocation guide for the US. Im not talking the default "US Frequency Allocations Chart." but something more like a book or guide. Does such a thing exist? Thanks in advance, Isaac -- View this message in context: http://www.nabble.com/US-Spectrum-Allocation-Details-tp20129833p20129833.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Does OpenBTS compile
Has anyone gotten the openBTS code to compile? -- View this message in context: http://www.nabble.com/Does-OpenBTS-compile-tp19614533p19614533.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] basic usrp cygwin install questions
When you get everything worked out, can you please post your procedure so that others can use it. Thanks in advance, Isaac -- View this message in context: http://www.nabble.com/basic-usrp-cygwin-install-questions-tp19399754p19401189.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
RE: [Discuss-gnuradio] USRP2 Price
I dont see any daugterboards that work for the USRP2. isaac -- View this message in context: http://www.nabble.com/USRP2-Price-tp19399125p19400649.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] USRP2 Price
What about the daughter boards? Any rough ideas? -- View this message in context: http://www.nabble.com/USRP2-Price-tp19399125p19399213.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] USRP2 Price
Any ideas in US dollars? Isaac -- View this message in context: http://www.nabble.com/USRP2-Price-tp19399125p19399125.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] USRP2
Where can I find information on what capabilities of the USRP2? Any ppt slides available for this? Thanks in advance, Isaac -- View this message in context: http://www.nabble.com/USRP2-tp19371391p19371391.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] The OpenBTS project - an open-source GSM basestation using the USRP and VoIP
How do you implement your energy detector to detect the bursts? Also, on your website, you say you can process 7 calls simultaneously on the MacBook.Are all these calls on 1 ARFCN? (ie you have 7 of the time slots simultaneously filled). What code/algorithm are you using for the GSM demodulator? Is it the one written in the GNU Radio software? Isaac -- View this message in context: http://www.nabble.com/The-OpenBTS-project---an-open-source-GSM-basestation-using-the-USRP-and-VoIP-tp19302323p19319860.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] VSat
Test isaacgerg wrote: > > Has anyone done anything with GNU Radio / USRP and VSats? > -- View this message in context: http://www.nabble.com/VSat-tp19160592p19169107.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] VSat
Has anyone done anything with GNU Radio / USRP and VSats? -- View this message in context: http://www.nabble.com/VSat-tp19160592p19160592.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] GNU Radio Software Performance
Does anyone have any performance metrics of the GNU Radio software for a given platform? Also, has anyone been able to demodulate GMSK in real time? Any feedback would be appreciated. Thanks in advance, Isaac -- View this message in context: http://www.nabble.com/GNU-Radio-Software-Performance-tp19068213p19068213.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Time tagging
Is there any plans to have the data time tagged as it comes out of the USRP? Isaac -- View this message in context: http://www.nabble.com/Time-tagging-tp18895912p18895912.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Best GNU Radio'ing in real time (or near real time)
Hi everyone, I was wondering what are the largest bandwidths/signals people here have processed in real time on their PC's using the GNU Radio. For example maybe, HDTV, GSM, etc. What were you computers specs? Thanks in advance, Isaac -- View this message in context: http://www.nabble.com/Best-GNU-Radio%27ing-in-real-time-%28or-near-real-time%29-tp18881585p18881585.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Data distribution rates with USRP
Hi everyone, Suppose I wanted to just read in data from the USRP and broadcast it out over gigabit ethernet to a bunch of machines what is the largest bandwidth I could do this with and not drop data from the USB link. Isaac -- View this message in context: http://www.nabble.com/Data-distribution-rates-with-USRP-tp18858327p18858327.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Flipping problem
If this is true, why is it that the residual carrier is reported as zero? Are you suggesting that this value is not correct? Isaac Matt Ettus wrote: > > isaacgerg wrote: >> I am sending a known sequence of samples from one USRP to another using >> the >> Basix RX/TX d'boards setting the frequency to 24e6. >> >> When I rx the sequence, the correlation of it keeps flipping, but not in >> a >> way that suggests residual carrier. It seems as if I am experiencing an >> instantaneous flip. >> >> My gain on both the RX and TX is set to 500. The signal amplitude I rx is >> ~1200. When I run the GRC model, the Rx says I have no residual carrier, >> invert is set to false, the dxc frequency is set to -24e6 and the >> baseband >> to zero. On the TX side, I have these same values with the exception of >> the >> dxc freq, it is not set to 24e6. Why the flip?? What do all these >> things >> mean??? >> >> Is 24e6 a bad freq to use with the basic TX/Rx? >> >> Thanks in advance! >> > > I believe what you are seeing here is that the two USRPs are on two > different frequencies. This is not a fault of the USRP. No two > oscillators will be on exactly the same frequency, and so in any > practical receiver you must synchronize. > > Matt > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/Flipping-problem-tp18614309p18711285.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Possible residual carrier not reported correctly
Eric,
When you talk about the FPGA, do you mean that I can repull and reinstall
the FPGA code for the USRP? This I have never done since the radio has been
purchased 2 years ago.
Isaac
Eric Blossom wrote:
>
> On Mon, Jul 28, 2008 at 12:27:22PM -0700, isaacgerg wrote:
>>
>> Eric,
>> I pulled GNU Radio from the SVN repository no more than 3 months ago.
>> What do you mean the FPGA had a flipping problem? Wouldnt this affect my
>> USRP hardware or does the GNU Radio code correct for it?
>>
>> Isaac
>
> I was thinking of ticket:179
> http://gnuradio.org/trac/ticket/179
> It was fixed in r6764 on the trunk on 10/31/2007.
>
>> Eric Blossom wrote:
>> >
>> > On Mon, Jul 28, 2008 at 11:34:01AM -0700, isaacgerg wrote:
>> >>
>> >> Eric,
>> >> I have answered you questions inline:
>> >>
>> >> >>Are you seeing any over or underruns ("uOuO" or "uUuU") on the
>> console?
>> >> Occasionally, I see "u0" on the rx. But, even if i post process data
>> >> offline, i still get the "flip"
>
> If you're getting "uO" your machine is not keeping up. This would
> cause a discontinuity in the received data, post-processed or not.
>
> Eric
>
>
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Re: [Discuss-gnuradio] Possible residual carrier not reported correctly
Eric,
I read the ticket. We are just sending float data and it doesnt appear
that the arms are getting flipped, but that over time, their phase is
changing. Our correlation peaks go from being very positive to being very
negative over a gradient.
Any ideas?
Isaac
Eric Blossom wrote:
>
> On Mon, Jul 28, 2008 at 12:27:22PM -0700, isaacgerg wrote:
>>
>> Eric,
>> I pulled GNU Radio from the SVN repository no more than 3 months ago.
>> What do you mean the FPGA had a flipping problem? Wouldnt this affect my
>> USRP hardware or does the GNU Radio code correct for it?
>>
>> Isaac
>
> I was thinking of ticket:179
> http://gnuradio.org/trac/ticket/179
> It was fixed in r6764 on the trunk on 10/31/2007.
>
>> Eric Blossom wrote:
>> >
>> > On Mon, Jul 28, 2008 at 11:34:01AM -0700, isaacgerg wrote:
>> >>
>> >> Eric,
>> >> I have answered you questions inline:
>> >>
>> >> >>Are you seeing any over or underruns ("uOuO" or "uUuU") on the
>> console?
>> >> Occasionally, I see "u0" on the rx. But, even if i post process data
>> >> offline, i still get the "flip"
>
> If you're getting "uO" your machine is not keeping up. This would
> cause a discontinuity in the received data, post-processed or not.
>
> Eric
>
>
> ___
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>
>
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Re: [Discuss-gnuradio] Possible residual carrier not reported correctly
Eric,
I pulled GNU Radio from the SVN repository no more than 3 months ago.
What do you mean the FPGA had a flipping problem? Wouldnt this affect my
USRP hardware or does the GNU Radio code correct for it?
Isaac
Eric Blossom wrote:
>
> On Mon, Jul 28, 2008 at 11:34:01AM -0700, isaacgerg wrote:
>>
>> Eric,
>> I have answered you questions inline:
>>
>> >>Are you seeing any over or underruns ("uOuO" or "uUuU") on the console?
>> Occasionally, I see "u0" on the rx. But, even if i post process data
>> offline, i still get the "flip"
>>
>> >> How wide is the signal you're trying to send?
>> The rx interp is 256 and the tx interp is 512 giving a BW=250Khz.
>> Since I
>> am just sending random samples, I am using the whole band.
>>
>> >> What interpolation and decimation values are you using?
>> See above.
>>
>> >> Try sending it at 10MHz.
>> I did. The Rx cannot see my signal anymore; a PSD confirms this. Not
>> sure why.. maybe an antenna issue.
>>
>> >> What version of GNU Radio are you using?
>> I do not know what version the radios are. How do i find this out? The
>> serial numbers are 1460 and 1461 and there is a date on the sticker that
>> says 4/16/07.
>
>
> Sorry, not the board, the GNU Radio software you're running on the host.
>
> There was a problem in the FPGA code that was fixed quite a while
> ago (6 or 9 months) where there was some kind of flipping.
>
>
>> >> Have you isolated the problem to the Tx or Rx path?
>> I believe it is in the Rx path. The TX path simply reads up a data
>> file
>> of samples and sends them to the USRP... very simple. The RX path
>> receives
>> the data and attempts to correlate on the samples I sent. However, I am
>> noticing that the correlation is postive, then negative, and continues
>> this
>> way alternating about every 1000 samples or so.
>>
>> Isaac
>
> Eric
>
>
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>
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Re: [Discuss-gnuradio] Possible residual carrier not reported correctly
Eric,
I have answered you questions inline:
>>Are you seeing any over or underruns ("uOuO" or "uUuU") on the console?
Occasionally, I see "u0" on the rx. But, even if i post process data
offline, i still get the "flip"
>> How wide is the signal you're trying to send?
The rx interp is 256 and the tx interp is 512 giving a BW=250Khz. Since I
am just sending random samples, I am using the whole band.
>> What interpolation and decimation values are you using?
See above.
>> Try sending it at 10MHz.
I did. The Rx cannot see my signal anymore; a PSD confirms this. Not
sure why.. maybe an antenna issue.
>> What version of GNU Radio are you using?
I do not know what version the radios are. How do i find this out? The
serial numbers are 1460 and 1461 and there is a date on the sticker that
says 4/16/07.
>> Have you isolated the problem to the Tx or Rx path?
I believe it is in the Rx path. The TX path simply reads up a data file
of samples and sends them to the USRP... very simple. The RX path receives
the data and attempts to correlate on the samples I sent. However, I am
noticing that the correlation is postive, then negative, and continues this
way alternating about every 1000 samples or so.
Isaac
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[Discuss-gnuradio] Possible residual carrier not reported correctly
Hi, I am using the Basic RX/TX at 24Mhz. Both the tx and rx tell me that there is no residual carrier. yet, the waveform I send seems to keep flipping from positive to negative polarity. Is it possible that there is residual carrier that is not being reported correctly? Thanks in advance. Isaac -- View this message in context: http://www.nabble.com/Possible-residual-carrier-not-reported-correctly-tp18659713p18659713.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Possible residual carrier not reported correctly
Hi, I am using the Basic RX/TX at 24Mhz. Both the tx and rx tell me that there is no residual carrier. yet, the waveform I send seems to keep flipping from positive to negative polarity. Is it possible that there is residual carrier that is not being reported correctly? Thanks in advance. Isaac -- View this message in context: http://www.nabble.com/Possible-residual-carrier-not-reported-correctly-tp18659710p18659710.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Flipping problem
I am sending a known sequence of samples from one USRP to another using the Basix RX/TX d'boards setting the frequency to 24e6. When I rx the sequence, the correlation of it keeps flipping, but not in a way that suggests residual carrier. It seems as if I am experiencing an instantaneous flip. My gain on both the RX and TX is set to 500. The signal amplitude I rx is ~1200. When I run the GRC model, the Rx says I have no residual carrier, invert is set to false, the dxc frequency is set to -24e6 and the baseband to zero. On the TX side, I have these same values with the exception of the dxc freq, it is not set to 24e6. Why the flip?? What do all these things mean??? Is 24e6 a bad freq to use with the basic TX/Rx? Thanks in advance! -- View this message in context: http://www.nabble.com/Flipping-problem-tp18614309p18614309.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] USRP Gain
Is there any documentation on what the gain does for the USRP receive and transmit functions. Sometimes it seems like these values are meaningless. Also, I am noticing that when I begin to Rx data, there is often a huge amplitude spike within the first 2k samples I Rx. Is this normal? -- View this message in context: http://www.nabble.com/USRP-Gain-tp18612337p18612337.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] GNU Radio Companion Simplex Tx/Rx not working
I have the basic TX and basic RX boards for my USRP. I am using GRC 0.7 and I cant get the simplex tone test to work. What setting should I tweak or do you know why it wouldnt work? Is it possible that I have the wrong antenna? Thanks in advance -- View this message in context: http://www.nabble.com/GNU-Radio-Companion-Simplex-Tx-Rx-not-working-tp18120764p18120764.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GNU Radio Companion USRP Transmitter Example
No luck. Can you send me an example xml schema for a transmitter that you know works? Thanks in advanced, Isaac Josh Blum wrote: > > > isaacgerg wrote: > >> Does anyone have an .xml file that shows an example of doing this? >> Currently, I have a USRP sink with the following parameters and I cant >> get >> any signals on my Rx USRP. I know my Rx USRP is working as I can run the >> gnuradio ptt example and I can see energy appearing on the PSD. >> >> Here are my USRP Sink parameters: >> Input type: complex >> usint #: 0 >> subdev spec: side B >> freq: 2500 >> gain 3200 >> mux 0x0 >> auto t/r : ignore >> tx enable: enable >> interp: 400 >> >> The input to the sink is a cosine wave at 1 with amplitude 100. >> >> Thanks in advance. > > > Im not sure about the board you are using, but the actual allowed gain > parameter is way less than 3200. Set the usrp gain to 0, and try a > amplitude of 5000 for the signal source. > > -Josh > > -- View this message in context: http://www.nabble.com/GNU-Radio-Companion-USRP-Transmitter-Example-tp18115899p18116117.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] GNU Radio Companion USRP Transmitter Example
Does anyone have an .xml file that shows an example of doing this? Currently, I have a USRP sink with the following parameters and I cant get any signals on my Rx USRP. I know my Rx USRP is working as I can run the gnuradio ptt example and I can see energy appearing on the PSD. Here are my USRP Sink parameters: Input type: complex usint #: 0 subdev spec: side B freq: 2500 gain 3200 mux 0x0 auto t/r : ignore tx enable: enable interp: 400 The input to the sink is a cosine wave at 1 with amplitude 100. Thanks in advance. -- View this message in context: http://www.nabble.com/GNU-Radio-Companion-USRP-Transmitter-Example-tp18115899p18115899.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] GMSK Viterbi Equalization
Is this scheme as simple as doing an LMS decision-directed equalization scheme where the Viterbi algorithm used to make the symbol decision? -- View this message in context: http://www.nabble.com/GMSK-Viterbi-Equalization-tp17786331p17786331.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] gsm gmsk demodulation
My question to all of you responding on this question then is: How do I convert the amplitudes of my GMSK signal to probabilities for viterbi based demodulation? Isaac Steven Clark-2 wrote: > > On Thu, Jun 5, 2008 at 7:45 AM, isaacgerg <[EMAIL PROTECTED]> wrote: >> >> Hi, >> Concerning GSM GMSK demodulation, due to the ISI, I initially thought >> many >> folks were using the Viterbi algorithm on the waveform to demodulate it >> properly. After doing some lit review, I am finding that this is not the >> case and that when most folks talk about Viterbi concerning GSM GMSK >> demodulation, they are referring to undoing the convolution encoding and >> not >> referring to demodultion in the face of ISI. Can anyone please confirm >> this? >> >> I see many demodulators simply just ignoring the ISI and just >> demodulating >> as if it wasnt present. It seems they just rely on the convolutional >> encoding for error correction and therefore dont need to worry about the >> ISI..Is this true? > > What you have said is true in my experience as well. More often than > not, Viterbi decoding is just used as part of the forward error > correction scheme. > > Please look for my next email to the mailing list for an alternate > GMSK demodulator that reduces ISI... > > -Steven > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/gsm-gmsk-demodulation-tp17667993p17731307.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Posted: Enhanced GMSK demodulator
Ive noticed that the papers you cited only take in "real" data and not "complex." Is this true? Is this true for your implementation? Isaac Steven Clark-2 wrote: > > I've added a link to > http://gnuradio.org/trac/wiki/Enhanced_GMSK_Demodulator from > http://gnuradio.org/trac/wiki/OurUsers > > Summary: > [...] offers an enhanced GMSK demodulator that I believe to be > superior to the GNURadio standard gmsk demodulator. It should be a > drop-in replacement for the existing demodulator in designs, except > that the transmitted data needs to be differentially encoded (you will > NOT, however, need a differential decoder on the receive side). The > enhanced demodulator should offer better bit error rate (BER) > performance, especially for lower bandwidth-bittime (BT) products, > such as the GSM standard BT=0.3, and in lower SNR conditions. > > Please check it out and comment... > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/Posted%3A-Enhanced-GMSK-demodulator-tp17677732p17691518.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] gsm gmsk demodulation
Steven, That is totally rockin'; thanks! Isaac Steven Clark-2 wrote: > > On Thu, Jun 5, 2008 at 7:45 AM, isaacgerg <[EMAIL PROTECTED]> wrote: >> >> Hi, >> Concerning GSM GMSK demodulation, due to the ISI, I initially thought >> many >> folks were using the Viterbi algorithm on the waveform to demodulate it >> properly. After doing some lit review, I am finding that this is not the >> case and that when most folks talk about Viterbi concerning GSM GMSK >> demodulation, they are referring to undoing the convolution encoding and >> not >> referring to demodultion in the face of ISI. Can anyone please confirm >> this? >> >> I see many demodulators simply just ignoring the ISI and just >> demodulating >> as if it wasnt present. It seems they just rely on the convolutional >> encoding for error correction and therefore dont need to worry about the >> ISI..Is this true? > > What you have said is true in my experience as well. More often than > not, Viterbi decoding is just used as part of the forward error > correction scheme. > > Please look for my next email to the mailing list for an alternate > GMSK demodulator that reduces ISI... > > -Steven > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/gsm-gmsk-demodulation-tp17667993p17679423.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] gsm gmsk demodulation
Hi, Concerning GSM GMSK demodulation, due to the ISI, I initially thought many folks were using the Viterbi algorithm on the waveform to demodulate it properly. After doing some lit review, I am finding that this is not the case and that when most folks talk about Viterbi concerning GSM GMSK demodulation, they are referring to undoing the convolution encoding and not referring to demodultion in the face of ISI. Can anyone please confirm this? I see many demodulators simply just ignoring the ISI and just demodulating as if it wasnt present. It seems they just rely on the convolutional encoding for error correction and therefore dont need to worry about the ISI..Is this true? -- View this message in context: http://www.nabble.com/gsm-gmsk-demodulation-tp17667993p17667993.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] gnuradio compile problems for i686
I am using whatever version is on fedora core 9 (im not at the machine), what does "use the trunk" mean? Eric Blossom wrote: > > On Mon, Jun 02, 2008 at 11:14:57AM -0700, isaacgerg wrote: >> >> I get the same errors with gnuradio 3.1.2 and 3.1.1 >> >> gr_dispatcher.cc In member function 'void gr_dispatcher::loop(double)': >> gr_dispatcher.cc:177: error 'perror' was not declared in this scope. >> >> Thanks in advanced, >> Isaac > > What version of GCC are you using? 4.3.* ? > > If so, use the trunk. > > Eric > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/gnuradio-compile-problems-for-i686-tp17606791p17608949.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] gnuradio compile problems for i686
I get the same errors with gnuradio 3.1.2 and 3.1.1 gr_dispatcher.cc In member function 'void gr_dispatcher::loop(double)': gr_dispatcher.cc:177: error 'perror' was not declared in this scope. Thanks in advanced, Isaac -- View this message in context: http://www.nabble.com/gnuradio-compile-problems-for-i686-tp17606791p17606791.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GNURadio Companion File Sink
I dont understand, in your previous post you said the following: "Unless the data stream is an array of complex, float, int, short, or byte, the vector length should be 1. " Yet, you are telling me it should be one. Is this correct? Josh Blum wrote: > > isaacgerg wrote: >> Im not down in the code, Im just trying to use the application. What >> does >> that number translate to? >> > Set the type to complex and leave the vector length as 1. > >> Also, once I get the data, how is it formated? as 2 float32 values, one >> for >> the real arm and one for the imaginary part? > > yes, each sample will be written as 2 binary 4 byte floats, i believe > that real part is 1st > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/GNURadio-Companion-File-Sink-tp17541624p17563875.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GNURadio Companion File Sink
Im not down in the code, Im just trying to use the application. What does that number translate to? Also, once I get the data, how is it formated? as 2 float32 values, one for the real arm and one for the imaginary part? -- View this message in context: http://www.nabble.com/GNURadio-Companion-File-Sink-tp17541624p17563384.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GNURadio Companion File Sink
Im just trying to do a data capture with my USRP. I would like the data in complex format. What should the length be set to? Josh Blum wrote: > > Essentially, the gr_file_sink has one parameter, the size of the data > stream in bytes. GRC splits this up into two parameters, the data type > (complex, float, int...) and the vector length. The size of the data > stream = number of bytes in the data type times the vector length. > > Unless the data stream is an array of complex, float, int, short, or > byte, the vector length should be 1. > > -Josh > > isaacgerg wrote: >> What does the vector length option mean? It is set to 1 by default. >> > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/GNURadio-Companion-File-Sink-tp17541624p17562873.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] GNURadio Companion File Sink
What does the vector length option mean? It is set to 1 by default. -- View this message in context: http://www.nabble.com/GNURadio-Companion-File-Sink-tp17541624p17541624.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] GMSK midamble template matching
I am also finding that I need to match against not only the template, but the complex conjugate of the template too! -- View this message in context: http://www.nabble.com/GMSK-midamble-template-matching-tp17512969p17541609.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] GMSK midamble template matching
I would like to identify the 26 midamble bits in each burst of GSM (GMSK) data. I hear that a lot of ppl use correlation to do this. However, I am struggling to understand how this technique could work due to the ISI from the Gaussian pulse shaping. It seems that the wavefrom of the 26 midamble bits is depdented on the data coming before them and thus, template matching would not work. There must be something I am missing here. Any help would be greatly appreciated. Thanks in advanced, Isaac -- View this message in context: http://www.nabble.com/GMSK-midamble-template-matching-tp17512969p17512969.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] BasicRx Daugterboard Frequency Wrapping
It looks like i need to get an RF front end to pre-filter all that stuff out of there. -- View this message in context: http://www.nabble.com/BasicRx-Daugterboard-Frequency-Wrapping-tp17375343p17408282.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] BasicRx Daugterboard Frequency Wrapping
The mapping you ask describing isnt what I am getting. According to your scheme, with the Basic RX board, I shouldnt be able to get any FM radio stations, but I am able to get them. Why is this? Isaac -- View this message in context: http://www.nabble.com/BasicRx-Daugterboard-Frequency-Wrapping-tp17375343p17406855.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] BasicRx Daugterboard Frequency Wrapping
In the short term, how do i fix this problem? Do I just low pass filter my incoming signal? Isaac Ed Criscuolo-2 wrote: > > isaacgerg wrote: >> Hi, >> I am hooked up to the BasicRx Daughterboard and wrote a simple >> applicate >> using the GRC to survey the spectrum from 1MHz to 250MHz and run the user >> tunable output through the WFM Demodulator. I can get FM radio stations >> in >> the 88-108MHz region just find. However, I am also getting copies of >> these >> stations at frequencies higher and lower than this range!!! It's as if >> the >> frequency I request is out of range and the tuner wraps around. What's >> going on here? When I tune to 50MHz, I expect to be at 50MHz, not some >> other frequency! > > On re-reading my first post, I realized it wasn't very clear. So, > to be more explicit: > > A 0 - 32 MHz signal will produce the expected output. > > Signals from 32 - 64 MHz will get mapped onto 32 - 0 MHz > (note the frequency inversion) > > 64 - 96 MHz will get mapped to 0 - 32 MHz > > 96 - 128 MHz will get mapped to 32 - 0 MHz > > > ... and so on, up to the limits of the board. > > > @(^.^)@ Ed > > > > ___ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/BasicRx-Daugterboard-Frequency-Wrapping-tp17375343p17406821.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] BasicRx Daugterboard Frequency Wrapping
Hi, I am hooked up to the BasicRx Daughterboard and wrote a simple applicate using the GRC to survey the spectrum from 1MHz to 250MHz and run the user tunable output through the WFM Demodulator. I can get FM radio stations in the 88-108MHz region just find. However, I am also getting copies of these stations at frequencies higher and lower than this range!!! It's as if the frequency I request is out of range and the tuner wraps around. What's going on here? When I tune to 50MHz, I expect to be at 50MHz, not some other frequency! Also, why are there two Rx outputs on this daugther board? How do they differ? Maybe my problem is here. Thanks, Isaac -- View this message in context: http://www.nabble.com/BasicRx-Daugterboard-Frequency-Wrapping-tp17375343p17375343.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
