Hi everyone,
I am trying to test signal tranmit by using OFDM modulator via USRP1 and i
am getting this error message . Does anyone know what does it mean?or how to
fix this problem. i connected one usrp1 with usb cable to my laptop just to
check the transmission. it shows the signal in FFT sink but when i add USRP
sink it gives me this error. i am not sure how to confirm that wheater it is
tranmsitting the signal or not. Any help will be appriciated
Error: failed to enable realtime scheduling.
usrp: failed to find usrp[0]
Traceback (most recent call last):
File "/home/lefteris/top_block.py", line 98, in <module>
tb = top_block()
File "/home/lefteris/top_block.py", line 51, in __init__
self.usrp_simple_sink_x_0 = grc_usrp.simple_sink_c(which=0, side="A")
File "/usr/lib/python2.6/dist-packages/grc_gnuradio/usrp/simple_usrp.py",
line 91, in __init__
self._make_usrp(which=which, nchan=1)
File "/usr/lib/python2.6/dist-packages/grc_gnuradio/usrp/common.py", line
28, in _make_usrp
def _make_usrp(self, *args, **kwargs): self._u =
self._usrp_args[0](*args, **kwargs)
File "/usr/lib/python2.6/dist-packages/gnuradio/usrp/usrp_swig.py", line
2469, in sink_c
return _usrp_swig.sink_c(*args, **kwargs)
RuntimeError: can't open usrp
Thanks....
waq.
Tuan (Johnny) Ta wrote:
>
> Quick correction
> cd /usr/share/gnuradio/examples/ofdm/
> ./benchmark_ofdm_tx.py -h
>
> On Sun, Sep 11, 2011 at 7:26 PM, Tuan (Johnny) Ta
> <ta.tu...@gmail.com>wrote:
>
>> Try this
>> cd /usr/share/gnuradio/examples/ofdm/
>> benchmark_ofdm_tx.py -h
>>
>> Don't forget the spaces (just copy & paste should work)
>>
>>
>> On Sun, Sep 11, 2011 at 7:19 PM, waqasme <waqa...@hotmail.com> wrote:
>>
>>>
>>> hello Johnny,
>>> I tried that locate command and i have found the location of the files
>>> .here
>>> is the output:
>>> hp@ubuntu:~$ cd/usr/local/bin
>>> bash: cd/usr/local/bin: No such file or directory
>>> hp@ubuntu:~$ ls
>>> Desktop Downloads Music Public Templates
>>> Documents examples.desktop Pictures rx file Videos
>>> hp@ubuntu:~$ locate benchmark_ofdm_tx.py
>>> /usr/share/gnuradio/examples/ofdm/benchmark_ofdm_tx.py
>>> /usr/share/gnuradio/examples/ofdm/benchmark_ofdm_tx.pyc
>>> hp@ubuntu:~$ locate benchmark_ofdm_rx.py
>>> /usr/share/gnuradio/examples/ofdm/benchmark_ofdm_rx.py
>>> /usr/share/gnuradio/examples/ofdm/benchmark_ofdm_rx.pyc
>>> hp@ubuntu:~$ benchmark_ofdm_tx.py -h
>>> benchmark_ofdm_tx.py: command not found
>>> hp@ubuntu:~$ benchmark_ofdm_tx.py-h
>>> benchmark_ofdm_tx.py-h: command not found
>>> hp@ubuntu:~$ cd benchmark_ofdm_tx.py-h
>>> bash: cd: benchmark_ofdm_tx.py-h: No such file or directory
>>>
>>> I have used locate comand to find the benchmark files. its in
>>> /usr/share...
>>> /usr/share/gnuradio/examples/ofdm/benchmark_ofdm_tx.py
>>> /usr/share/gnuradio/examples/ofdm/benchmark_ofdm_tx.pyc
>>> Now as in my previous discussion with sumit, he mentioned after that
>>> type
>>> these comands to show the paramaters
>>> benchmark_ofdm_tx.py-h but it says comand not found.
>>> Am i missing something here in the command line? Please advise for
>>> further
>>> process..
>>> Thanks..
>>> Waq.
>>>
>>>
>>> Tuan Ta-2 wrote:
>>> >
>>> > You seem to be quite new to Linux, what do you intend to do for your
>>> > Master
>>> > thesis? Gnuradio is not something you can master in a couple of
>>> months.
>>> >
>>> > To go to a directory, you need to use the 'cd' command. Ie
>>> > cd /usr/local/bin
>>> >
>>> > My benchmark_ofdm code is not in /usr/local/bin so when you get to
>>> that
>>> > folder, do a 'ls' to see if the code is there. If not, you can run
>>> > locate benchmark_ofdm_tx.py
>>> >
>>> > The results will show you where the file is in your system.
>>> >
>>> > Good luck,
>>> > Johnny
>>> >
>>> > On Sun, Sep 11, 2011 at 5:55 PM, waqasme <waqa...@hotmail.com> wrote:
>>> >
>>> >>
>>> >> Hi Sumit,
>>> >> Thanks you so much for ur detailed explanation . i really appriciate
>>> your
>>> >> help.
>>> >> I am following the same steps as you mentioned earlier but iam
>>> getiing
>>> >> this
>>> >> message when i am entering these comands in terminal. here is the
>>> >> messages
>>> >> .
>>> >>
>>> >> hp@ubuntu:~$ /usr/local/bin
>>> >> bash: /usr/local/bin: is a directory
>>> >> hp@ubuntu:~$ directory/usr/local/bin
>>> >> bash: directory/usr/local/bin: No such file or directory
>>> >> hp@ubuntu:~$ /usr/local/bin
>>> >> bash: /usr/local/bin: is a directory
>>> >> hp@ubuntu:~$ benchmark_ofdm_tx.py-h
>>> >> benchmark_ofdm_tx.py-h: command not found
>>> >>
>>> >> when i enter this comand i get this result
>>> >> hp@ubuntu:~$ directory/usr/local/bin
>>> >> bash: directory/usr/local/bin: No such file or directory
>>> >> hp@ubuntu:~$
>>> >> No such file or directory. how to access that directory? do i need
>>> to
>>> >> run
>>> >> some other commands before that ?
>>> >> what could be the problem ? any suggestion ?
>>> >>
>>> >>
>>> >> sumitstop wrote:
>>> >> >
>>> >> > go to the directory /usr/local/bin
>>> >> > there u will find benchmark files for ofdm (both transmission and
>>> >> > reception)
>>> >> > u need to type benchmark_ofdm_rx.py -h
>>> >> > and benchmark_ofdm_tx.py -h
>>> >> >
>>> >> > these will show you the parameters u can play with.
>>> >> >
>>> >> > after that u can run these files by typing ./benchmark_ofdm_tx.py
>>> -f
>>> >> > <frequency appropriate to ur daughter board>
>>> >> > and ./benchmark_ofdm_rx.py -f <frequency appropriate to ur daughter
>>> >> board>
>>> >> >
>>> >> > also there may be drift in the center frequency of the daughter
>>> board
>>> >> so
>>> >> u
>>> >> > can do one thing. first run the transmitter part and see on the
>>> >> spectrum
>>> >> > analyzer for the center frequency of the ofdm signal.
>>> >> >
>>> >> > after that run the receiver part with that center frequency
>>> specified
>>> >> in
>>> >> > the arguments.
>>> >> > now run the transmitter again with the same frequency.
>>> >> >
>>> >> > if u get timeouts then u need to play with the receiver gain and
>>> >> > transmitter amplitude as well as the receiver center frequency.
>>> >> >
>>> >> > u can change the bandwidth of the ofdm signal by changing the no of
>>> >> > occupied tones or fft length because bw = occupied tones/ fft
>>> length
>>> >> >
>>> >> > let me know ur results.
>>> >> >
>>> >> > Regards
>>> >> >
>>> >> > waqasme wrote:
>>> >> >>
>>> >> >> hello sumit,
>>> >> >> yah i have replaced the GMSK modulator and demodulator with OFDM
>>> >> >> modulator and demaodulator. but i coudlnot find message source ,
>>> >> ,message
>>> >> >> sink, probe signal and probe avg mag 2 with only input .. the one
>>> i
>>> >> have
>>> >> >> found has input and output as well for probe avg mag 2 block... i
>>> >> >> couldnot able to find these blocks as in the simple tranceiver
>>> diagram
>>> >> >> example they used these blocks... can you plesase guide me where
>>> to
>>> >> get
>>> >> >> these blocks?
>>> >> >> Also you mentioned this command ( benchmark_ofdm.py -h ) is that
>>> a
>>> >> >> command or what? because i have entered this command in terminal
>>> >> window
>>> >> >> but it says command not found? and if i type in google to search
>>> it
>>> >> opens
>>> >> >> a c ++ code ..what i am suppose to do with that. ?? please tell me
>>> how
>>> >> to
>>> >> >> use this benchmark_ofdm.py code.. where to put this code to make
>>> the
>>> >> >> simulation work. i am very new to GNU radio so i have no idea what
>>> >> >> functions i can play with and how to implement this. please guide
>>> me
>>> >> >> like how to make this OFDM tranmission and reception via USRP.
>>> iam
>>> >> >> using Linux Ubuntu maveric and GNU Radio companion 3.2.2
>>> version...
>>> I
>>> >> >> really appriciate your help because i have only few time left for
>>> my
>>> >> >> Masters project. Thanks in advance i am looking forward to hear
>>> from
>>> >> you.
>>> >> >>
>>> >> >> Regards,
>>> >> >> Waq.
>>> >> >>
>>> >> >> sumitstop wrote:
>>> >> >>>
>>> >> >>>
>>> http://pwnhome.files.wordpress.com/2011/04/simple_transceiver1.png
>>> >> >>> see carefully....... it has a gmsk modulator in the bottom.u can
>>> make
>>> >> >>> the bottom modulator part in another pc
>>> >> >>>
>>> >> >>> benchmark programs are quite good to start with...
>>> >> >>> u can type benchmark_ofdm.py -h to see all the parameters u can
>>> play
>>> >> >>> with.
>>> >> >>>
>>> >> >>>
>>> >> >>> waqasme wrote:
>>> >> >>>>
>>> >> >>>> And sorry to mention in the last mail that i will be suing USRP
>>> 1
>>> .
>>> >> >>>>
>>> >> >>>> waqasme wrote:
>>> >> >>>>>
>>> >> >>>>> Hi Sumit,
>>> >> >>>>> Thank you so much for your quick response. yah i understand
>>> what
>>> >> your
>>> >> >>>>> saying and i am trying to understand this document but it
>>> doesnot
>>> >> help
>>> >> >>>>> much . As you mentioned use the same Tranceiver setup and only
>>> >> replace
>>> >> >>>>> OFDM blocks with that. My question is in this basic tranciver
>>> >> diagram
>>> >> >>>>> the used two UHD's source and sink and in the middle they use
>>> GMSK
>>> >> >>>>> Demodulator right. but they didnot use any modulator any where
>>> in
>>> >> the
>>> >> >>>>> design. Now i am confused what blocks i have to replace with
>>> OFDM
>>> >> >>>>> blocks??? Please try to explain in bit detail so i can design
>>> it
>>> >> >>>>> properly .
>>> >> >>>>> OR you mentioned other option that use benchmark_OFDM.py file .
>>> >> >>>>> Somebody already told me about this benchmark file. but its
>>> just
>>> >> C++
>>> >> >>>>> code . i am quite new to GNU radio and dont know much about the
>>> >> >>>>> functions how it works.
>>> >> >>>>> Please let me know how to use that benchmark_OFDM.py file in
>>> order
>>> >> to
>>> >> >>>>> make the simulation design? do i have to download the file or
>>> what?
>>> >> >>>>> how it works ?? let me know if you know about the process how
>>> to
>>> >> >>>>> compile and run that code in GNU radio.
>>> >> >>>>>
>>> >> >>>>> Thanks for ur help and support really appriciate that...
>>> >> >>>>>
>>> >> >>>>> Regards,
>>> >> >>>>>
>>> >> >>>>> Waqas.
>>> >> >>>>>
>>> >> >>>>>
>>> >> >>>>> sumitstop wrote:
>>> >> >>>>>>
>>> >> >>>>>> Try to understand these
>>> >> >>>>>>
>>> >> >>>>>>
>>> >>
>>> http://pwnhome.wordpress.com/2011/04/26/intro-to-gnuradio-and-the-usrp-part-5-simple-transceiver/
>>> >> >>>>>>
>>> >> >>>>>> here u need to put those ofdm blocks .. thats it.... also go
>>> >> through
>>> >> >>>>>> some modifications as written in umit,
>>> >> >>>>>>
>>> >> >>>>>>
>>> >> >>>>>>
>>> >>
>>> http://pwnhome.wordpress.com/2011/04/19/intro-to-gnuradio-and-the-usrp-part-4/
>>> >> >>>>>>
>>> >> >>>>>> or else work with benchmark_ofdm.py its very easy.. :)
>>> >> >>>>>>
>>> >> >>>>>> may i know what daughter boards do you have...
>>> >> >>>>>>
>>> >> >>>>>>
>>> >> >>>>>>
>>> >> >>>>>>
>>> >> >>>>>>
>>> >> >>>>>> waqasme wrote:
>>> >> >>>>>>>
>>> >> >>>>>>>
>>> >> >>>>>>> Hello sumit,
>>> >> >>>>>>> Thanks for your help i went through that document that you
>>> >> refered
>>> >> >>>>>>> to, and i tried to implement that OFDM transmitter part. This
>>> >> >>>>>>> document only explain about OFDM flow graph or transmitter.
>>> Is
>>> >> there
>>> >> >>>>>>> any other document or information related to OFDM modulator
>>> and
>>> >> >>>>>>> demodulator (Transceiver)? i haver to implement OFDM
>>> transmission
>>> >> >>>>>>> and reception via USRP. i will really appriciate if you can
>>> help
>>> >> me
>>> >> >>>>>>> that or someone else who knows how to implement by using GNU
>>> >> radio
>>> >> >>>>>>> companion.
>>> >> >>>>>>> Thanks in advance.
>>> >> >>>>>>> Regards,
>>> >> >>>>>>> Waq.
>>> >> >>>>>>>
>>> >> >>>>>>>
>>> >> >>>>>>
>>> >> >>>>>>
>>> >> >>>>>
>>> >> >>>>>
>>> >> >>>>
>>> >> >>>>
>>> >> >>>
>>> >> >>>
>>> >> >>
>>> >> >>
>>> >> >
>>> >> >
>>> >>
>>> >> --
>>> >> View this message in context:
>>> >> http://old.nabble.com/OFDM-Implementation-tp32380874p32444101.html
>>> >> Sent from the GnuRadio mailing list archive at Nabble.com.
>>> >>
>>> >>
>>> >> _______________________________________________
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>>> >> Discuss-gnuradio@gnu.org
>>> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>> >>
>>> >
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>>>
>>>
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>>
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