FTW 802.11 ofdm encoder, sending multiple packages

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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You should be able to send multiple packets using -r option (0 for
unlimited).

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:

i’m working on a project using the FTW 802.11 ofdm encoder Project from

My frame consists of 2 symbols, each a vector of 80 elements after
whole
Sent from the GnuRadio mailing list archive at Nabble.com.

Sankalp Nimbhorkar
CSC Graduate Student
North Carolina State University


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