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Re: [Discuss-gnuradio] FTW 802.11 ofdm encoder, sending multiple package
Re: [Discuss-gnuradio] FTW 802.11 ofdm encoder, sending multiple packages
Fri, 25 Feb 2011 13:06:36 -0500
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>
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
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
Where can I find more information about the output_rate and scheduler?
Thanks for your help,
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