Re: [Discuss-gnuradio] OFDM Implementation

[waqasme]

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 .

address@hidden:~$ /usr/local/bin
bash: /usr/local/bin: is a directory
address@hidden:~$ directory/usr/local/bin
bash: directory/usr/local/bin: No such file or directory
address@hidden:~$ /usr/local/bin
bash: /usr/local/bin: is a directory
address@hidden:~$ benchmark_ofdm_tx.py-h
benchmark_ofdm_tx.py-h: command not found

when i enter this comand i get this result
address@hidden:~$ directory/usr/local/bin
bash: directory/usr/local/bin: No such file or directory
address@hidden:~$
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.
>>>>>>> 
>>>>>>> 
>>>>>> 
>>>>>> 
>>>>> 
>>>>> 
>>>> 
>>>> 
>>> 
>>> 
>> 
>> 
> 
> 

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