hello, well i followed the same steps and now i can see the different options by typing that command benchmark_ofdm_py. -h .. now am done up till that now i asked my supervisor to provide me the extra USRP so hopefully i will get it soon from him. till that time i am just try to understand how it works . i have one question reagarding the OFDM signal block processing diagram like which we can create in GNU Radio companion. For this particular benchmark_OFDM is there any block diagram or blocks i have to create in GNU radio companion? and one more question do i need 1 USRP1 device or two to transmit and recieve? please let me know the procedure how to setup . i am assuming it is connected through USB interface what else is required to make a proper setup? thanks once again for your help. Thanks to u and johnny... Please advise...
sumitstop wrote: > > Hi, > sorry my internet was down for almost 12 hrs... so whts the situation > now.are you able to transmit and receive .... > > > waqasme 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-tp32380874p32446970.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
