Dear All,
I'm a graduate student and my research area includes wireless sensor networks
and signal processing.
I notice the lack of a absolute clock synchronization method in USRP without
cable or external input such as GPSDO.And the sync arruracy should be as high
as microsecond.This is cru
Hi,
I wanna execute the dial_tone.cc example.So I execute "g++
dial_tone.cc -I /usr/local/include/gnuradio/"
But I got the errors:
laptop:~/Desktop/ccompile$ g++ dial_tone.cc -I /usr/local/include/gnuradio/
/tmp/ccxAFik0.o: In function `main':
dial_tone.cc:(.text+0x59): undefined reference
于 2013/5/15 0:50, Tom Rondeau 写道:
On Tue, May 14, 2013 at 2:08 PM, Gong Zhang wrote:
Hi,
I wanna execute the dial_tone.cc example.So I execute "g++ dial_tone.cc
-I /usr/local/include/gnuradio/"
But I got the errors:
laptop:~/Desktop/ccompile$ g++ dial_tone.cc -I /usr/loc
Hi,
I have known that the .cc example in gnuradio would be compiled when
running "make" in the build directory.But how can I compile my own .cc
file through g++ command line?
Thanks.
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the gr-uhd sink's input port. If you want to send
arbitrary information, you still need to packet-ize and modulate the
information.
Maybe you will find this project relevant:
https://github.com/jmalsbury/pre-cog/wiki
-josh
On 03/19/2013 03:35 AM, Gong Zhang wrote:
Hi,
I wanna send custom
Josh,
I'm curious about how it tune the LO in USRP. Does it control the
LO via
'post_msg(CTRL_PORT,pmt.pmt_string_to_symbol('usrp_sink.set_center_freq')'?
Thanks.
2013/6/9 1:44, John Malsbury wrote:
Jay,
Thanks for checking out pre-cog. I'm not sure what "algorithm" you'd
call it
Hi,
Would a sample with tx_tag time in near future hold off the tx stream
until it is sent?
Thanks.
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Hi,
I have read the file tx_timed_samples.cpp. But it seems the data are
sent without modulation.Is it correct? And why?
Thanks in advance.
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Hi,
I got the source code of gras using git,and I followed the instruction
to install gras.But I got errors while making.
/home/zg/Desktop/Codes/gras/gras/Theron/Include/External/boost/atomic/detail/gcc-x86.hpp:
In function ‘void boost::atomic_thread_fence(boost::memory_order)’:
/home/zg/Deskt
Sorry for the incomplete information. I'm using Ubuntu 10.04 and the
boost version is 1.40
2013/7/25 Josh Blum :
>
>
> On 07/25/2013 04:51 AM, Gong Zhang wrote:
>> Hi,
>> I got the source code of gras using git,and I followed the instruction
>> to install gr
Dear Nathan,
I have tried the method in the URL but it does not work. The error
remains.
2013/7/30 10:58, Nathan West wrote:
On Mon, Jul 29, 2013 at 10:44 PM, Harry Zhang wrote:
Hi,
I'm using Ubuntu 12.04 and libboost1.46. I got the following errors when
I make the project.
libboo
Hi,
I execute the flowgraph in attachment and I got the following.
What's the problem? I'm using Ubuntu 12.04, boost 1.48 and gnuradio
3.6.4.
Thanks in advance.
Traceback (most recent call last):
File "/home/harry/Desktop/qwer/GRC/top_block.py", line 75, in
tb = top_block()
File "/hom
Dear Josh,
Thanks for your reply.
I move the code "get_tags_in_range" in
digital_correlate_access_code, so it will be executed when
digital_correlate_access_code runs.
I start the sender first and then the receiver. But I still get no tag.
Does "the beginning of stream" mean the point just
I'm newbie to gnuradio.I got a problem when i use the latest
gr_modtool to check the howto_square_ff example.I work with
Ubuntu10.04,python2.6 and Cheetah2.4.4. When i excute 'gr_modtool add'
I got the following:
Add Python QA code? [Y/n] n
Add C++ QA code? [Y/n] n
Traversing lib...
Adding file 'ho
It's master which I downloaded three days ago.
On Mon, Nov 5, 2012 at 09:26:32PM +0100, Martin Braun wrote:
>I accidentally pushed a buggy version somewhere along the line, you must
>have caught that.
>Just get a new version, it should work. Which branch are you on, master
>of format37?
_
> Can you try the most current version, please.
>
> M
>
It works.Thank you for you help.
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Hi List,
I'm trying to check the example howto_square_ff with gr_modtool.I work
with ubuntu10.04,gnuradio 3.6.1 and cmake2.8.1.When I excute 'cmake ../'
in /gnuradio3.6.1/build.I got the following:
-- Configuring gr-wxgui support...
-- Dependency ENABLE_GR_CORE = ON
-- Dependency ENABLE_PYTHON = ON
Tom Rondeau wrote:
I assume you have an installed and working copy of GNU Radio on your
system? Did you happen to change the install prefix when building?
Usually, you just have to add the path to the gruel.pc file to
PKG_CONFIG_PATH. You'll find it in $prefix/lib/pkgconfig. If
pkg-config can't f
Tom Rondeau wrote:
Oh, I see what's happening; I didn't look closely enough at your first
message.
You don't really want to use gr_modtool to add new components to GNU
Radio. It's meant to be used to build separate projects that will work
with and installed GNU Radio. See, gr_modtool creates a p
Martin Braun (CEL) wrote:
Perhaps this is a bug, but I can't reproduce that error, not with 3.6.1, master,
next nor with any branch of gr_modtool.
Please tell us
- where libgruel.so is (if it's somewhere exotic, Josh's answer is all
you need)
- which version of GNU Radio you're using.
Also, try
Hi everyone,
I know the max communication range depends on a lot.But I've only seen
these experiments two of the board placed on the same table.
Thanks.
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Hi,
Is it possible to implementation FH/DS hybrid spread spectrum with USRP.Surely
it won't hop too fast.
Thanks.
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Hi everyone,
I am curious about acquisition time of a unknown frequency with usrp.
Thanks.
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Dear all,
Can I add power amplifier between daughterboard and antenna for longer
communication range?Does anyone try this before?
Thanks.
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Hi,
I wanna know the frequency drift of WBX daughterboard.I think it may
depend on the stability of WBX oscillator.How can I calculate it?
Thank you.
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Hi,
I wanna synchronize two USRPs to sample signal at the time.And the
synchronization accuracy should be of microseconds without external
clock and cable.This leads me to design a synchronization protocol but
not on PC because of the jitter of ethernet.It seems openBTS add a
timestamp block in FPG
Hi,
My last topic "Synchronize multiple USRP-N210s"may be a big one which
gives no reply.If I want to synchronize two USRPs without cable or
GPSDO,I should design a synchronization protocol.Simply A sends some
time-stamped samples to B ,then B record local time when receiving these
samples.Knowing
2013/1/31 11:51, Josh Blum wrote: On 01/30/2013 09:00 PM, Gong Zhang wrote:
Hi,
My last topic "Synchronize multiple USRP-N210s"may be a big one which
gives no reply.If I want to synchronize two USRPs without cable or
GPSDO,I should design a synchronization protocol.Simply A sends
Hi,
Considering we can get timesamples of rx samples from UHD in
metadata,can I add timesamples to tx samples,which would be send together.
Thanks.
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2013/2/22 11:44, Josh Blum wrote:
On 02/21/2013 09:20 PM, Gong Zhang wrote:
Hi,
Considering we can get timesamples of rx samples from UHD in
metadata,can I add timesamples to tx samples,which would be send together.
Thanks.
Sure thing!
This link points to some of the examples:
http
Maybe my last replay is ambiguous.In metadata,the the time value of
rx_sample tags was get by the command "time.time()".Does it mean that
the actual time recorded in tags refer to when the sample goes through
AD in USRP with the clock in USRP?
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Hi,
I found the following notes in file metadata.hpp in UHD:
/*!
* RX metadata structure for describing sent IF data.
* Includes time specification, fragmentation flags, burst flags,
and error codes.
* The receive routines will convert IF data headers into metadata.
*/
A
Hi,
I think python file means data go downstream without interacting
with other data stream.And I have seen several example writen in c++ and
they all contain a gr_top_block which makes them similar to python
files.Any body have the experience developing in c++?And what you think
is the maj
Hi,
I have read the fhss_engine.py file.It seems that they send timed
information via msg.And it's impossible to recevie any bit unless they
use external synchronization.Is it right?Any suggestion would be
appreciated.
Thanks./
///
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Hi,
I have read the file tdma_engine.py in PreCog.It seems they deal with
data and update local time according to the time tags.But how can we
demodulated the signal from antenna in the start without knowing the
time.Is this imply we can only transmission at the fixed frequency?I
appreciate any tip
Hi,
I wanna transmit a 1khz Sinusoidal signal for one second and transmit
2khz for another second.The code maybe something like this:
set_command_time(&mytime)
sig_sin_source.work(...)
set_command_time(&mytime+1)
sig_sin_source.work(...)
But as I know,the first set_command_time would back-pressure
2013/3/4 15:56, Josh Blum wrote:
On 03/03/2013 09:28 PM, Gong Zhang wrote:
Hi,
I wanna transmit a 1khz Sinusoidal signal for one second and transmit
2khz for another second.The code maybe something like this:
set_command_time(&mytime)
sig_sin_source.work(...)
set_command_time(&
d to change "freq_list " that should match ur RF-Daughter card
>
>
> -Adeel
>
> On Mon, Mar 4, 2013 at 5:18 PM, Gong Zhang wrote:
>>
>> 2013/3/4 15:56, Josh Blum wrote:
>>>
>>>
>>> On 03/03/2013 09:28 PM, Gong Zhang wrote:
Thank you for your reply.And this may lead to ambiguous. The streaming
data will totally work independent of the backpressure or it will be
backpressure untill the command queue is full?
2013/3/5 1:26, Josh Blum wrote:
On 03/04/2013 08:28 AM, Gong Zhang wrote:
Your reply gave me much
Hi List,
What is the max/min time for a command to pass from host to USRP?I
think it's critical for determin the time slot for a TDM system.
Thanks in advance.
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Hi,
I want to transmit fixed numbers of sample from the
sin_sig_source.And I find the issue_stream_command in
multi_usrp.hpp.Does the command contral the flow graph so that I just
connect the flow graph and add the command in python? I appreciate any tips.
Thanks in advance.
__
Hi,
UHD is swigged but I can't find uhd interface in python manual.Could
anyone give me a URL?Thanks.
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Hi,
I wanna send custom data such as the device number or device status with
USRP.Does it mean I should go deeply into something like
tx_stream->send()?Is there any similar example?
Thanks in advance.
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send
arbitrary information, you still need to packet-ize and modulate the
information.
Maybe you will find this project relevant:
https://github.com/jmalsbury/pre-cog/wiki
-josh
On 03/19/2013 03:35 AM, Gong Zhang wrote:
Hi,
I wanna send custom data such as the device number or device status
Hi,
I think it is easy to implement that simply cast every
item（float,int,size_t,time_tag and so on） into binary.Have there
already been a block for this.
Thanks in advance.
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Hi,
I notice that the parameter "gr_vector_const_void_star
&input_items,gr_vector_void_star &output_items"in the work() method is
the void* pointer,which don't point to any definite data type.For
example,the output data type is float32 in the upper block and the input
data type maybe int8 in the ne
2013/4/6 21:39, Tom Rondeau wrote:
On Sat, Apr 6, 2013 at 8:37 AM, Gong Zhang wrote:
Hi,
I notice that the parameter "gr_vector_const_void_star
&input_items,gr_vector_void_star &output_items"in the work() method is
the void* pointer,which don't point to any definite da
Hi,
I got the GSoC news and I have a new idea to add.It suggests to contact
mailing list first.But I don't know whom to contact.
Thanks.
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