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. > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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