I want to measure channel gain between rx-tx pair for a TDD system.( first
slot between A to B second slot between B to A with self switching of USRP).
Any suggested example to follow? Any reference design?
Packet based link should be a good idea I guess.
Jay
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I am planning to test some of my physical layer algorithms on SDR.
I compared these two USRPs , though Ettus is part of NI now and features of
these devices are almost same, still there is huge variation almost double
in price which I am not able to justify!
What are additional benfits of NI USRP
implemented using new Messaging API of GRAS, as earlier
implementation using gr-extras?
3. Has there been new additions/ projects to GRAS? I read past few months
mail list archive. I was surprised to see there has been hardly any
reference to this beautiful feature!
Jay Prakash
I am doing spectrum sensing at 8MHz sampling rate using N210 series.
I have 4 USRPs accessible via switch.
But on setting sample rate as high as 8 MHz the code runs for few seconds
and comes out with UHD Error.
I did benchmark test as follows:-
*./benchmark_rate --args="addr=10.32.19.159" --rx_r
I have 4 N210 USRP accessible via switch.
Though it use to come sometime but today even uhd_find_devices gives the
same error!
UHD Error:
Control packet attempt 0, sequence number 6:
RuntimeError: no control response, possible packet loss
UHD Error:
Control packet attempt 0, sequenc
I am using Ubuntu 11.10.
Though I installed Gnu Radio on two systems using same script, it's not
working on new system!
wget http://www.sbrac.org/files/build-gnuradio && chmod a+x
./build-gnuradio && ./build-gnuradio
..
.
.
checking for library libboost ...Found library libboost
Checking for libr
dio.filter before USRP sink
in transmit path.py
As I am placing an artificial channel with multipath components I was
expecting for some error in bits.
Jay Prakash
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Parameters:- *
*self.channel_model_0 = filter.channel_model(*
* noise_voltage=0.00,*
* frequency_offset=0.00,*
* epsilon=1.0,*
* taps=([1.0, 0.25-0.25j, 0.50 + 0.10j, -0.3 + 0.2j, 0.1 - 0.01j, -0.2 +
0.2j] ),*
* noise_seed=3,*
* )*
*
*
*Jay Prakash *
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Discuss
0101 sequence).
If I go for increasing the noise after 0.01 the demodulation does not gives
any output!
Any way or may be I am not using the channel model so wisely!
Jay Prakash
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be lagging.
Setting time of transmission/freq hop from tx side and getting rx_time info
from tags can help in establishing the channel I want.
Please help me figuring out the synchronization with respect to Pre-cog
implementation.
Jay Prakash
On Mon, Jun 17, 2013 at 12:43 AM, John Malsbury
I think i can use set_command_time (which i guess set the next time of
transmission/command?).
how can i make the usrp send its time when configured for synchronization?
Jay Prakash
Senior Undergraduate
Electronics Engineering
IIT (BHU)
VARANASI
+91-9559475258
http://about.me/jay.prakash/
http
so do we have any other block to do that. I did'nt find XML_RPC block in
the new gr-extras
Jay Prakash
Senior Undergraduate
Electronics Engineering
IIT (BHU)
VARANASI
+91-9559475258
http://about.me/jay.prakash/
http://www.linkedin.com/profile/view?id=91120191&trk=hb_tab_pro_top
On
thanks for the clarification
so i checked the new grextras wiki it has uhd_control block i guess that
can be used for this job.
Jay Prakash
Senior Undergraduate
Electronics Engineering
IIT (BHU)
VARANASI
+91-9559475258
http://about.me/jay.prakash/
http://www.linkedin.com/profile/view?id=91120191
how can we set the time of usrp by sending it message. I know there are
function to (usrp.set_time_now()) do this from from top block variable but
can this be done by sending message at usrp port .
We can give internal reference signal of 10MHz but is there also a way to
give pps signal internally
Thanks a lot Josh.
It went all so smooth!
Your new push is working perfect.
Jay Prakash
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] Error 2
make: *** [all] Error 2
Jay Prakash
Senior Undergraduate
Electronics Engineering
IIT (BHU)
VARANASI
+91-9559475258
http://about.me/jay.prakash/
http://www.linkedin.com/profile/view?id=91120191&trk=hb_tab_pro_top
On Fri, Jun 14, 2013 at 7:58 AM, Josh Blum wrote:
>
>
> On 06/13
ng into Apology...
fatal: reference is not a tree: ab6fc7615056dd5b6c737e1f4005250fe0281039
Unable to checkout 'ab6fc7615056dd5b6c737e1f4005250fe0281039' in submodule
path 'Apology'
Link of pastebin http://pastebin.com/2gXAmayz
On Fri, Jun 14, 2013 at 7:42 AM, Josh Blum wrote:
>
h then and ran cmake.
Jay Prakash
Senior Undergraduate
Electronics Engineering
IIT (BHU)
VARANASI
+91-9559475258
http://about.me/jay.prakash/
http://www.linkedin.com/profile/view?id=91120191&trk=hb_tab_pro_top
On Fri, Jun 14, 2013 at 7:24 AM, Josh Blum wrote:
>
>
> On 06/13/2013 0
I followed same as given on the gras wiki you suggested.
only problem now is gnuradio cloning.
Which git repo of gnuradio should I clone for successfully making gras?
Jay Prakash
Senior Undergraduate
Electronics Engineering
IIT (BHU)
VARANASI
+91-9559475258
http://about.me/jay.prakash/
http
While doing cmake for installing Gras it gives: -
*Using install prefix: /usr/local*
*CMake Error at gnuradio/CMakeLists.txt:245 (GR_LOGGING):*
* Unknown CMake command "GR_LOGGING".*
I got gnuradio in gras directory from git clone
http://github.com/gnuradio/gnuradio
J
I am trying to synchronize multiple radios working in a band.
Is there any prior implementation of PTP(Precise Time Protocol) based
synchronization in GNU Radio?
Jay Prakash
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Sry,
It's switch but not a dedicated one.
Sample rate 1M.
But error came even at 32k.
Jay Prakash
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Sorry,Solved.
There was gain settings problem.
Sometimes gain issues do arrive as I saw.
I powered off the devices,changed gain after analyzing best response of
uhd_fft for a normal random source gmsk modulated signal.
It's performing fine now
Jay Pr
I am connecting it on LAN using D-Link router.
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USRP N210
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File "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/__init__.py",
line 116, in constructor_interceptor
return old_constructor(*args)
File "/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py",
line 2895, in usrp_sink
return _uhd_swig.usrp_sink(*args)
RuntimeError: RuntimeE
I have installed the extras and precog as per wiki.
The gnuradio-comapnion extras blocks are working fine.
But when I try to run precog modules given there is error:-
*GRAS: The debug asserts are enabled. <<<*
*Traceback (most recent call last):*
* File "", line 1, in *
* File "/usr/local/lib/p
Hi,
Actually My version of Ubuntu is 11.10.
And I am also getting the same error with input_buffer_queues.hpp
Jay Prakash
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at(): ASSERT FAIL total_idle_times[i] <= (time_now() - _init_time)
Aborted* "
Help me out.
Jay Prakash
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indow parameter)'.
(Details: serial 958 error_code 9 request_code 137 minor_code 8)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the --sync command line
Jay Prakash
em in tun/tap and PHY layer interface.
How to figure this out?
Jay Prakash
Senior Undergraduate
Electronics Engineering
IIT (BHU)
VARANASI
+91-9559475258
http://about.me/jay.prakash/
http://www.linkedin.com/profile/view?id=91120191&trk=hb_tab_pro_top
On Mon, Jun 10, 2013 at 7:13 PM, To
rk since
benchmark_rx.py is very strong and rated code in itself.
Jay Prakash
Senior Undergraduate
Electronics Engineering
http://www.linkedin.com/profile/view?id=91120191&trk=hb_tab_pro_top
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destination and it
knows whom to reply for the ping but still I don't find any reception
confirmation on source side.
What may be the possible problems?USRP antenna gain?Packets collision?
In short we are unable to use tunnely.py and are seeking for possible
causes.
Jay Prakash
S
algorithms rather engineering constraints?
Jay Prakash
Senior Undergraduate
Electronics Engineering
IIT (BHU)
VARANASI
+91-9559475258
http://about.me/jay.prakash/
http://www.linkedin.com/profile/view?id=91120191&trk=hb_tab_pro_top
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