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. >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>> >>>> >>> >>> >> >> > > ----- Sumit Kr. Research Assistant Communication Research center IIIT Hyderabad India -- View this message in context: http://old.nabble.com/OFDM-Implementation-tp32380874p32446297.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
