Re: [Discuss-gnuradio] FTW 802.11 ofdm encoder, sending multiple packages

[Hans-Christian]

Hi,

i mean different packages. The -r / -- repetition option works well, but i
want to send a sequence of different frames later, of course with a
modificated parsing later.



Sankalp Nimbhorkar wrote:
> 
> You should be able to send multiple packets using -r option (0 for
> unlimited).
> 
> On Fri, Feb 25, 2011 at 1:31 AM, Hans-Christian
> <address@hidden>wrote:
> 
>>
>> Hello @All,
>>
>> i’m working on a project using the FTW 802.11 ofdm encoder Project from
>> Cgran on Ubutntu 10.04 and Gnuradio3.2.2, Python 2.6 , USRP2 RFx2400.
>> Transmitting single Frames works fine.
>>
>>  I want to send multiple packages, so i modified the send_pkt function in
>> the ftw.ofdm.py file and call the
>> “self._pkt_input.msgq().insert_tail(msg)
>> twice. ( and only EOF is send)
>> Both messages from the msgq are consumed, but only the first frame is
>> transmittet.
>> The script stops at tb.wait().
>>
>> After reading a bit about the GR scheduler i guess there is a problem
>> with
>> the set_output_rate in the ftw_ofdm_preamble.cc ( line 52 )
>>
>> Is there a way to set the output_rate without knowledge about the numbers
>> of
>> symbols per frame?  (or is everything ok with the set_output_rate, and
>> the
>> error is somewhere else?)
>>
>>  My  frame consists of 2 symbols, each a  vector of  80 elements after
>> the
>> passing the ofdm_mapper, pilot,cmap,ifft, cpadder, scale and strem2vec.
>> (64QAM and 9 Byte payload)
>>
>> The preamble has 320 items. Divided by 80 the preamble is 4 symbols long.
>> So
>> the output is 6 symbols. Is that right?
>>
>>
>> Has anybody else tried to send multiple frames? (without calling the
>> whole
>> script again)
>>
>> Where can I find more information about the output_rate and scheduler?
>>
>> Thanks for your help,
>>
>> Hans
>> --
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>>
>>
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> 
> 
> 
> -- 
> Sankalp Nimbhorkar
> CSC Graduate Student
> North Carolina State University
> 
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> 

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