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Re: [Discuss-gnuradio] OFDM Implementation

From: waqasme
Subject: Re: [Discuss-gnuradio] OFDM Implementation
Date: Sun, 11 Sep 2011 06:17:24 -0700 (PDT)

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.


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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