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
