Dear GNU Radio community,
we are happy to announce that Fennec Research in cooperation with
Munich Innovation Labs is offering GNU Radio User Developer Trainings
in Germany!
Date: August 6, Thursday to August 7, Friday, 2015
Venue: Bremen, Germany
Goal: Independent development and
The OFDM receiver is geared towards packetized data. It might work,
but you'd need:
- A synchronization algorithm
- A better equalizer
- A definition for the packet format.
For DAB the pi/4-dqpsk is differentially encoded in time over all
subcarriers,
with a pilot symbol over all subcarriers
Hi Jared,
Am 09.03.2014 19:30, schrieb Jared Boone:
11. What happens if two students are accepted to work on the same
project, e.g. from an organization's Ideas list?
That's fine, a little duplication is par for the course in open
source.
I take this to mean I should have both students
Hi Manu, Tracie,
I wouldn't worry about this for now. I'm assuming this is for your
GSoC project? If so, just keep going and make sure you get the math
right. You'll want to move this into a C++ block eventually,
anyways,
and do further optimizations there. We can worry about this problem
at
Am 15.05.2013 17:13, schrieb karimkhan:
Can we know the status of GSoC applications? Do we need to take any
action meanwhile?
See Martin's email last week.
J
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Am 23.04.2013 13:10, schrieb 2_...@libero.it:
Hi 2_b_2,
I think you should discuss this off-list directly with the designated
mentor.
Yep,but my mentor told me to submit my proposal also to the
community.
Actually, he didn't. There seems to be a communication issue.
For everyone: If you
Hi 2_b_2,
Am 23.04.2013 19:09, schrieb 2_...@libero.it:
Yep,but my mentor told me to submit my proposal also to the
community.
Actually, he didn't. There seems to be a communication issue.
sorry, I have not explained well.not my mentor(because mentor aren't
assigned now), but the potential
Thank you for your time.
Hi 2_b_2,
I think you should discuss this off-list directly with the designated
mentor.
Best regards,
Jens
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Hi Maria and everyone else interested in the LDPC code project!
The LDPC GSoC proposal has drawn quite some interest, and I'm very
happy about that. A few student have already discussed their proposals
with me offline.
A few points for all of you:
1. I'd like to keep the project practical,
Something obvious (although you might not actually want it :) is a 2D
equalizer and higher modulation schemes.
MB
sorry,but i didn't understand..why an equalizer?ofdm don't requeire
it,is it?
The equalization step is easy - the hard part is channel estimation
given a
certain set of pilot
Daniel,
Thank you for your suggestion, but I am currently looking for some
universities in US... Do you have any other thoughts? thanks!
VT is certainly a very good choice if you are interested in SDR.
But I think you need to be a bit more specific. What exactly do you
want
to do? Apply for
Daniel,
never mind, you wrote planning on pursuing a PhD. I missed that. :-)
Just my two cents: SDR is a mix of RF/communication engineering +
signal processing + (Matlab/Python/.../C++/C/Assembler/FPGA)
programming.
Any graduate program that provides you with these skills will allow
you to
On Wed, Feb 22, 2012 at 7:33 AM, Marcus D. Leech wrote:
...and hooray for Hertzian waves! -- Principal Investigator
For all those coming to Karlsruhe for our workshop [2], I'll gladly
throw a belated birthday party (read: offer you a can of cold beer)
at the birthplace of EM waves [1].
Jens
Andrew,
Am 15.02.2012 19:41, schrieb Andrew Davis:
Well some major GNUradio program would drive up sales of USRP's :)
Back on topic, IMHO Gnuradio's problem with large apps stems from it
trying to be the source to sink and everything in between of a radio.
Lets take DREAM for example, they
Hi Kaleem,
Am 10.02.2012 10:12, schrieb Kaleem Rana:
I am trying to implement a simple spectrum analyzer (based on energy
detection) with MATLAB's SDRu package (NOT Simulink!!!). I started
with a
[...]
This is the GNU Radio mailing list, if you are looking for Matlab
support
try the
Arturo,
Am 01.12.2011 20:05, schrieb Arturo Rinaldi:
I'd like to submit my own graduation thesis to the academic section
of the gnuradio wiki. Which is the right way to do it ?
congratulations! Just add it yourself. Have a look at the mailing list
archive or the web page on how to do that.
Hi Vincenzo,
so far I have not released the Soft-DVB code for a bunch of reasons,
which include Soft-DVB code base being one of the main tools of our MA
research here at DSPCoLa, Università di Pisa.
I know that this has come up before, but I still would like to
encourage
you to rethink this
Hi Martin,
On Fri, 21 Jan 2011 10:19:37 +0100, Martin Braun martin.br...@kit.edu
wrote:
And with all the drawbacks and bugs that GNU Radio has, there's nothing
comparable in the open source domain. So if GNU Radio really sucks,
then how about a proper discussion on what's wrong. And not about
Hi Bob,
On Fri, 26 Mar 2010 21:02:19 -0400, Robert McGwier rwmcgw...@gmail.com
wrote:
Jens:
Have you considered and rejected Pisarenko estimtion techniques or just
not
tried them yet?
The original application was narrow band interference suppression in DSSS
systems. Burg's
method works
Hi Brian,
we've done some work to our 'Spectral Estimation Toolbox' and added
Burg's algorithm for spectral estimation. It's all on CGRAN, see
https://www.cgran.org/wiki/SpecEst
This is good stuff; thanks for sharing!
If you don't mind, I am curious of your experience of the Burg versus
Hi Dave,
On Fri, May 15, 2009 at 03:51:33AM -0400, davek wrote:
somethin i have in my head i want to throw out there...
how hard would it be ( or is it even possible? ) to create a device that
appears to gnuradio to be a functioning USRP but actually passes data to and
from capture files.
From: Marcus D. Leech mle...@ripnet.com
Let's say I have an FFT output that's many, many, bins wide, and I want
to compress that information into a narrower display (let's say from 4M
bins down to 1024 bins).
My approach has been to sum up each set of [4M/1024] bins, and use that
Rafael,
On Mon, May 05, 2008 at 11:11:24PM -0300, rafael2k wrote:
Hi all,
Can anyone make available the OFDM / DAB implementation by Jens Elsner, which
original location was:
- http://www.1c3.de/gr-dab.tar.bz2
If you're interested in DAB and GNU Radio, I'd recommend starting
Steven,
On Mon, Apr 28, 2008 at 02:05:05PM -0400, Steven Clark wrote:
A certain daughtercard can support 0-70dB of gain, and the main-board
A/D chip can do 0-20dB of gain.
If I request 50dB of gain from software, how does this get distributed
between these two locations? Is one used
Just a quick answer - I hope I understood your problem correctly this
time.
On Fri, Aug 17, 2007 at 05:23:06PM -0600, Bahn William L Civ USAFA/DFCS wrote:
I'm asking the question for several reasons - some theoretical and others
practical. The basic driving force is as follows:
I have the
So the problem remains: Given only the i(t) and q(t) samples, which is all
the USRP gives back, how do I reconstruct x(t)?
Two options:
1) you need some kind of phase reference (coherent
demodulation), insert pilot symbols into x(t)
2) use AM modulation over one carrier only; this requires
Matt,
thanks for your reply.
is it feasible to implement an FFT directly on the
FPGA in the USRP?
Possible, yes, but the FPGA does not have any hard multipliers, so
you'll need to use logic cells for that. But I don't think it is necessary.
I would like to use the USRP for spectral
Hi Steve,
just checked your wiki. As was noted earlier on the list, Vanu Inc.
(http://www.vanu.com/) has GSM working in software only. So that
should be possible with GNU Radio, too. Check the list archive.
I would suggest to start the project in software only, PCs will
just become faster and
Hi,
for those interested in DAB and OFDM, I posted the results of my
student project (including data files) to:
http://www.1c3.de/dab/
I noticed that there has been some work on OFDM in the development
branch, too.
A big thanks you to everybody on the list, I learnt a lot about
software radio
DAB (http://en.wikipedia.org/wiki/Digital_audio_broadcasting) or
Jens Elsner [EMAIL PROTECTED] was working on this, not sure of the
status. The work-in-progress is not in the GNU Radio repository.
It's not my priority right now, but it (at least some functionality and
my student project
Hello,
if someone is interested in OFDM / DAB, I posted what I did so far
on http://www.1c3.de/gr-dab.tar.bz2.
It contains a small GI correlation based OFDM transmitter / receiver
for experiments, and a mode 2 DAB receiver (just displays the
constellation).
Jens
On Wed, Jul 26, 2006 at 11:08:25PM -0700, Eric Blossom wrote:
On Thu, Jul 27, 2006 at 12:47:46AM +0200, Jens Elsner wrote:
Hello,
I'd like to calculate the complex dot product with GNU Radio.
Is there a way to do it faster that this? This correlation takes
ages...
You can
Hello,
a quick question regarding gr_block::history() etc.
Say I've called set_history(2) in the constructor and
my work function pointers look like this:
gr_complex const *in = (const gr_complex *) input_items[0];
gr_complex *out = (gr_complex *) output_items[0];
What does in point to? Is
Hello,
I'd like to calculate the complex dot product with GNU Radio.
Is there a way to do it faster that this? This correlation takes
ages...
--- snipp ---
// calculates the inner product a, b between complex vectors (dot
// product), optionally shifts vector b first.
gr_complex
Hello,
I'm using current CVS; constellation_decoder_cb seems to not get build
correctly. inspect.getmembers(gr) shows no sign of it.
Maybe someone could give me a pointer on where to look to fix it?
Thanks,
Jens
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Discuss-gnuradio mailing list
Replying to myself here:
I was *thinking* that I was using current CVS - instead, some old
version was in the path first.
Jens
On Mon, Jul 24, 2006 at 11:27:05PM +0200, Jens Elsner wrote:
Hello,
I'm using current CVS; constellation_decoder_cb seems to not get build
correctly
+0200, Jens Elsner wrote:
Good morning!
I started writing a small signal processing block (OFDM transmitter) and ran
into some problems.
My starting point was the well written gr-how-to-write-a-block tutorial.
I have, let's say, 1536 input samples and want to produce 1800 output
samples
Good morning!
I started writing a small signal processing block (OFDM transmitter) and ran
into some problems.
My starting point was the well written gr-how-to-write-a-block tutorial.
I have, let's say, 1536 input samples and want to produce 1800 output
samples with my block. When I run my
Hello everybody,
I did some work the last couple of weeks implementing the cell search
algorithm and despreading of basic channels for WCDMA (UMTS) using the USRP
in Matlab.
Unfortunately I do not have the copyright, so I can't post the code.
But if anyone is interested in playing with WCDMA in
Dan,
I sampled an UTRA FDD downlink signal and implemented the widely know
standard cell search algorithm (see for example
http://www.umtsworld.com/technology/cell_search.htm). To understand the
details, you need to download the right document in the standard (ETSI
TS 125 113, if I remember
by
USRP (Python)?
Angilberto.
--- Jens Elsner [EMAIL PROTECTED] wrote:
Hello everybody,
I did some work the last couple of weeks
implementing the cell search
algorithm and despreading of basic channels for
WCDMA (UMTS) using the USRP
in Matlab.
Unfortunately I do not have
Hi Brett,
I'm still at it, but recently been pretty occupied otherwise.
Expect an update on my progress soon. :)
Jens
On Sat, May 27, 2006 at 03:05:33PM -0500, Brett L Trotter wrote:
I recall a discussion from a few weeks ago where Jens mentioned having
done some DAB receiving.
I had been
, with this it is straightforward to implement
- Differential coding
Finally, I am currently implementing a generic
- interleaver/deinterleaver.
Achilleas
Message: 2
Date: Sat, 6 May 2006 14:30:52 +0200
From: Jens Elsner [EMAIL PROTECTED]
Subject: [Discuss-gnuradio] GNURadio OFDM
question, our goals
are one in the same and could work with Eric Blossom (who has offered
lending some advice) to get this completed.
What is your timeframe?
Jens Elsner wrote:
Hello everybody,
I'd like to implement the physical layer of the DAB standard in GNURadio.
The resulting
is your timeframe?
Jens Elsner wrote:
Hello everybody,
I'd like to implement the physical layer of the DAB standard in GNURadio.
The resulting code of should be as versatile as possible since the basic
basic OFDM concept is the same for a lot of standards.
Blocks that should be reusalbe
have some free time now and
would like to work on this too in the gnuradio framework.
Have u captured any more data that you can please share with me ?
Regards
Prateek
On 4/6/06, Jens Elsner [EMAIL PROTECTED] wrote:
Achilleas,
thanks for your comments. I am beginning to like
On Fri, Apr 07, 2006 at 07:11:21PM -0400, Michael Dickens wrote:
I have a trellis encoder and the V decoder is in debugging (by me) -
hope to have version 1 finished by the end of this weekend. These
are generic encoder / decoder blocks, taking arbitrary # of input
streams and element
(comments inlined)
On Wed, Apr 05, 2006 at 02:02:23PM -0400, Robert McGwier wrote:
Yes. Here is what you are missing:
Let us concentrate (as does your nice animated gif) on one channel in
the OFDM.
Yes, what's depicted are all decoded symbols in one OFDM frame.
Let us suppose you have a
Achilleas,
thanks for your comments. I am beginning to like this problem, as it has
extended my knowlegde of OFDM tremendously - thanks everybody.
Nevertheless I'd like to see it solved. We have ruled out pretty much
every effect - I'm beginning to suspect that the transmitter actually sends
Achilleas,
my estimate is based on frequency domain correlation. Just count the
offset of the maximum (o). Then estimate the fractional offset (fo) by taking
the
value left (l) and right (r) of the maximum and calculate fo = (r-l)/(r+l).
To compensate substract the resulting frequency offset
Thanks for the reply! I'm really struggeling here...
Yes, I think this is a critical step. small letters are time domain and
capital letters are frequency domain.
x(n) --- X(k)
FFT
x(n-n') - e^(j*2*pi*n'*k/N) * X(k)
FFT
for one OFDM symbol, 0 =
to be received by
the simple division you have done below. I hope I get time to visit it
in greater detail today.
Bob
Jens Elsner wrote:
Bob, thanks for the reply.
This is exactly what I am doing:
[...]
dem = data ./ data_l;
[...]
A point-wise division by the last OFDM symbol
Achilleas,
thanks for taking the time. My goal is to implement COFDM in gnuradio,
DAB is a nice start.
To your points:
I got interested in this discussion and looked at the
standard briefly and at your matlab code.
I have a couple of initial points; I will spend more time sometime this
To resample, I used the Matlab resample function
chunk_resamp = resample(chunk, 2048, 2000);
It's basically an FIR low-pass - phase is linear.
I'll try again today without resampling, but then the timing is
pretty much screwed up.
Jens
On Fri, Mar 31, 2006 at 04:28:14PM -0800, Eric Blossom
Well - you can download the standard at ETSI. It's open and published.
I don't know about the US.
On Fri, Mar 31, 2006 at 05:46:49PM -0500, Charles Swiger wrote:
On Fri, 2006-03-31 at 17:08 +0200, Jens Elsner wrote:
I sampled a local DAB radio station at 225.648 MHz, decimation factor 32
:
[chunk_filt, z] = filter(b,a,chunk,z);
This would cause phase discontinuities at the edges of each block.
-Clark
From: Jens Elsner [EMAIL PROTECTED]
To: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] OFDM / DAB demodulation
Date: Sat, 1 Apr 2006 10:48:29 +0200
To resample, I used
as
opposed to conjecture. Post your matlab scripts. This remote viewing
exercise is inefficient.
Bob
Jens Elsner wrote:
I resampled all the data to do a proof-of-concept. The frames are only a
small part
of the chunk variable. What I am getting is a fairly nice pi/4 DPSK.
Only
On Sat, Apr 01, 2006 at 01:59:09PM -0800, Matt Ettus wrote:
Jens Elsner wrote:
I resampled all the data to do a proof-of-concept. The frames are
only a small part of the chunk variable. What I am getting is a
fairly nice pi/4 DPSK. Only that in between OFDM Symbols (there are
76
Good morning,
I sampled a local DAB radio station at 225.648 MHz, decimation factor 32
with the USRP/tvrx.
DAB is using COFDM with pi/4-DPSK on 1536 subcarriers (see www.etsi.com,
standard
EN300401 for details). I wrote some Matlab code to demodulate the
signal. The data is resampled from 2 MHz
Hello,
after some hours of fighting with wxpython and other dependencies
gnuradio/usrp works - almost.
No audio output so far:
ice:/home/ice/gnuradio/gr-build/gnuradio-examples/python/audio# ./mono_tone.py
-d /dev/dsp
ALSA lib pcm.c:2068:(snd_pcm_open_noupdate) Unknown PCM /dev/dsp
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