gives you the exact input
> signal as output, but it delays it by 5 samples.
> So the first sample reaching sink A looks a lot like the fifth reaching sink
> B.
>
> I can't just build a parallel
> chain that will merely delay the samples, and then fetch those delayed
> s
Hi,
I would like to process samples from a USRP (let's use FM
demodulation, for example) and then identify which of the original
samples correspond to a particular result at the end of the chain
(say, a beginning of a stereo transmission, a beginning of a song,
etc.).
The problem is, in the proce
les in GNU
> Radio, that would be meaningless, and also misleading, because it'd hide the
> "chunky" processing behaviour.
>
> Best regards,
> Marcus
>
>
> On 20.10.2015 18:37, Veljko Pejovic wrote:
>
> Hi,
>
> In order to better understand the gnuradio
Hi,
In order to better understand the gnuradio flowgraph I created a very
simple test in which I connected a vector source (running through
1,2,3,4,5,6,7,8,9,0) in series with two “Add Const” blocks. The first
block adds 1, the second subtracts 1. I have two probes that I query
every second. One p
OK, the issue resolved itself once I removed the manual installation
of osmosdr and installed it using Macports: port install gr-osmosdr
Veljko
On Fri, Jul 10, 2015 at 11:00 AM, Veljko Pejovic wrote:
> Hi,
>
> After a while I got back to playing with gnuradio, and I'm happy to
Hi,
After a while I got back to playing with gnuradio, and I'm happy to
see that the choice of available/supported hardware is much wider than
it used to be a few years ago.
I've got one of those DVB-T USB dongles, installed rtl-sdr software to
confirm that the device works (yes, I can listen to
, Feb 24, 2011 at 16:54, Veljko Pejovic wrote:
>>
>> I'm using Ubuntu 10.04 with a recent gnuradio-next branch and the UHD
>> driver on USRP2/WBX boards.
>> In an outdoor setup I have two receiving nodes about 40m away from
>> each other and from the transmitter.
Hi,
I'm using Ubuntu 10.04 with a recent gnuradio-next branch and the UHD
driver on USRP2/WBX boards.
In an outdoor setup I have two receiving nodes about 40m away from
each other and from the transmitter. The transmitter is a PC with two
USRP2s connected with a MIMO cable. It is sending two diffe
;>
>>
>> On 01/17/2011 11:31 AM, Veljko Pejovic wrote:
>>> Hi,
>>>
>>> I updated the OFDM example. You can find it at
>>> http://www.cs.ucsb.edu/~veljko/downloads/ofdm_example.tar.gz
>>>
>>> It supports both USRPs and the UHD driver.
Hi,
I updated the OFDM example. You can find it at
http://www.cs.ucsb.edu/~veljko/downloads/ofdm_example.tar.gz
It supports both USRPs and the UHD driver. I get pretty bad
performance with UHD receiver for some reason. Any ideas?
Cheers,
Veljko
On Tue, Jan 11, 2011 at 9:26 PM, Guanbo wrote
Hi,
usrp2_card_burner_gui.py in share/uhd/utils worked fine for me on
Ubuntu 10.04. Did you set the network interfaces addresses properly?
Cheers,
Veljko
On Tue, Nov 16, 2010 at 8:57 AM, Gregory, Adam wrote:
> Hi all,
>
>
>
> I’m trying to get a MIMO setup working using USRP2s with the UHD dr
Hi,
Setup: Two USRP2 + WBX boards, one PC with Ubuntu 10.04, the latest
gnruadio/next and uhd from the github. The PC hosts two PCI express
GigEthernet cards, which are connected to the two USRP2s.
I'm using UHD to tx/tr with two boards simultaneously. I'm working
with Multi USRP source and sink
e modified code provided by Veljko Pejovic (link:
> www.cs.ucsb.edu/~veljko/downloads/ofdm_example.tar.gz). After trying
> different combinations of parameters, I managed to get benchmark to work
> with most package received correctly. However, it turned out the CPU usage
> was very high, al
the faster machine also has a better GIgEthernet
card. Interestingly, I do not observe any other signs of CPU
throttling, such as dropped packets when I see the problem.
Cheers,
Veljko
2010/5/24 Eric Blossom :
> On Fri, May 21, 2010 at 02:15:15PM -0700, Veljko Pejovic wrote:
>> Hi,
Hi,
I'm using two USRP2 with XCVR2450s, a week old gnuradio git master and
Ubuntu 9.10.
A few months ago while using the OFDM code I observed that I tend to
receive (or send?) packets in groups, although I was sending them
individually.
Now, I finally isolated the problem. I added a few simple p
Hi George,
2010/4/6 George Nychis :
> Jeff, I definitely agree that buffering also adds significant latency. How
> much of the MAC can you get around? I just think that, there are a number
> of people who want the flexibility of the SDR, but want to do MAC research,
> and current common SDR arch
Two independent PC+USRP nodes. All the ACK related logic was
implemented at the Python layer.
Another thing that I tried was to connect the two nodes via Ethernet
(I have two Ethernet NICs in each of the PCs) and then use USRPs for
data and Ethernet for ACKs. I still couldn't get good results,
alt
I tried with a stop-and-wait ARQ and two USRP2s with XCVR2450s, but
the delay was too long and inconsistent. I can't remember the exact
figures, but definitely up to milliseconds.
Veljko
2010/4/6 George Nychis :
>
>
> On Tue, Apr 6, 2010 at 10:07 AM, Charles Irick wrote:
>>
>> Thanks for the rep
Hi,
I tried to use trellis_encoder from trellis package to perform
convolution coding before sending the message to the OFDM modulator.
However, ofdm_mod has zero input signature, and relies on send_pkt()
which calls ofdm_packet_utils.make_packet() and then puts the message
in the queue at gr.ofdm
o get the
error every time.
Does anyone have an idea about how to go around this?
Thanks a lot,
Veljko
2010/2/16 Alexandru Csete :
> On 16 February 2010 23:32, Veljko Pejovic wrote:
>> Thanks a lot for the answer, Jonathan.
>>
>> Yes, I am using 3.2.2, I'll tr
esn't
look like that from my measurements.
Thanks,
Veljko
2010/2/12 Veljko Pejovic :
> Hi Eric,
>
> 2010/2/12 Eric Blossom :
>> On Fri, Feb 12, 2010 at 12:52:00PM -0800, Veljko Pejovic wrote:
>>> Hi,
>>>
>>> I'm using two USRP2 with XCVR
Hi,
I had the same problem and I got the following hint by Timothy R. Gall:
"I just edited the makefile by hand to get rid of the error. You see
it says `/../lib/libgnuradio-pager.la', when it should be
`../lib/libgnuradio-pager.la'. Go to the gr-pager/swig directory and
edit the makefile, repl
when I
see it in my setup (Ubuntu 9.10, USRP2, XCVR2450)
cheers,
Veljko
2010/2/17 Eric Blossom :
> On Mon, Feb 15, 2010 at 10:51:05AM -0800, Veljko Pejovic wrote:
>> Update:
>> I moved the reconfiguration one level up, to transmit_path.py and it
>> works for high interpol
han Corgan :
> On Tue, 2010-02-16 at 13:47 -0800, Veljko Pejovic wrote:
>> Is it possible to dynamically reconfigure a flow graph that has a usrp2
>> source?
>
> Yes.
>
>> I tested a simple lock()/unlock() from the top graph, and also from
>> the other parts
Hi All,
Is it possible to dynamically reconfigure a flow graph that has a usrp2 source?
I tested a simple lock()/unlock() from the top graph, and also from
the other parts of the graph. I always get the following error:
usrp2: channel 0 not receiving
usrp2::rx_samples() failed
If on the other
2010/2/14 Veljko Pejovic :
> Hi,
>
> I have a similar problem in my code.
> I modified benchmark_tx.py from gnuradio-examples/ofdm and ofdm.py
> from blks2impl so that I can change the number of active subcarriers
> on fly.
>
> In the packet sending loop of benchmark_
Hi,
I have a similar problem in my code.
I modified benchmark_tx.py from gnuradio-examples/ofdm and ofdm.py
from blks2impl so that I can change the number of active subcarriers
on fly.
In the packet sending loop of benchmark_tx I periodically do the following:
lock the top block (tb.lock()), cal
Hi Eric,
2010/2/12 Eric Blossom :
> On Fri, Feb 12, 2010 at 12:52:00PM -0800, Veljko Pejovic wrote:
>> Hi,
>>
>> I'm using two USRP2 with XCVR2450s, gnuradio 3.2.2 and Ubuntu 9.10.
>>
>> I ran the benchmark_tx/rx example from gnuradio-examples/ofdm and
>
Hi,
I'm using two USRP2 with XCVR2450s, gnuradio 3.2.2 and Ubuntu 9.10.
I ran the benchmark_tx/rx example from gnuradio-examples/ofdm and
measured packet inter-arrival times at the receiver. I also modified
the sender to wait for some time (like 200ms) between individual
packets. I also set the m
Hi All,
I have Ubuntu 9.10 and gnuradio 3.2.2 installed on two identical PC
configurations, with two USRP2s (one per PC, obviously).
on both computers I have /etc/security/limits.conf file with the following line:
@usrp - rtprio 50
and on both of them I set the permissions for usrp2_socket_open
Hi,
The example provided with the gnuradio codebase requires small
modifications in order to work with USRP2. You can try with the
modifications I made:
www.cs.ucsb.edu/~veljko/downloads/ofdm_example.tar.gz
In my case with XCVR2450 daughter boards running the following works fine:
transmitter:
Hi,
I have gnuradio 3.2.2 installed on Ubintu 9.10 and I'm using USRP2s
with XCVR2450 daughterboards.
I tried your example but I changed the interpolation to correspond to
the decimation at the receiver:
./benchmark_ofdm_tx.py -f 2.4G -i 256 --fft-length=64
--occupied-tones=32 --cp-length=4
./ben
010/1/17 Veljko Pejovic :
> Thanks for the reply Patrik,
>
> I managed to identify parameter values that make OFDM decoding work.
> It seems that low decimation/interpolation rates don't work (a bunch
> of "S"s at the receiver), nor do higher modulation schemes. The
>
P.
>
> I have the same configuration as you, but I have the RFX2400 instead of the
> XCVR2450.
>
> Regards,
> Patrik Eliardsson
>
>> -Original Message-
>> From:
>> discuss-gnuradio-bounces+patrik.eliardsson=foi...@gnu.org
>> [mailto:discuss-gnurad
Hi,
I got the same error:
make[4]: *** No rule to make target `/../lib/libgnuradio-pager.la',
needed by `_pager_swig.la'. Stop.
make[4]: Leaving directory
`/home/moment/Documents/gnuradio-veljkop/trunk/gnuradio/gr-pager/swig'
make[3]: *** [all] Error 2
make[3]: Leaving directory
`/home/moment/Do
Hi Matt,
Is there an approximate release date for USRP2 driver?
Also, which type of antenna do you suggest for the WBX.
Thanks,
Veljko
2010/1/13 Matt Ettus :
> On 01/13/2010 12:01 PM, Gregory Maxwell wrote:
>>
>> On Wed, Jan 13, 2010 at 2:42 PM, Matt Ettus wrote:
>>>
>>> At long last, the
Hi,
I'm using Ubuntu 9.10, gnuradio version 3.2.2 and two USRP2 boards
with XCVR2450 daughter boards. The boards are about a meter apart from
each other.
I'm trying to get OFDM working over USRP2 boards and for that I'm
using GRC. I created a simple local loop (without USRPs):
signal_source->modu
Thanks for the clarification.
I'll see if I can write a wrapper. I assume that the G.7xx code in
gnuradio-core is working?
cheers,
Veljko
2010/1/7 Johnathan Corgan :
> On Thu, Jan 7, 2010 at 10:21, Veljko Pejovic wrote:
>
>> Also, if there is anyone with experience in vo
Hi All,
I'm using Ubuntu 9.10, gnuradio version 3.2.2 and two USRP2 boards
with XCVR2450 daughter boards.
I would like to establish G.711 encoded voice communication between
the two USRPs. I tested the link with tx_voice.py and rx_voice.py
example scripts and the Full Rate GSM encoding works fine
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