[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

From: Sankalp Nimbhorkar
Subject: Re: [Discuss-gnuradio] FTW 802.11 ofdm encoder, sending multiple packages
Date: 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> 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
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,

View this message in context: http://old.nabble.com/FTW-802.11-ofdm-encoder%2C-sending-multiple-packages-tp31010536p31010536.html
Sent from the GnuRadio mailing list archive at Nabble.com.

Discuss-gnuradio mailing list

Sankalp Nimbhorkar
CSC Graduate Student
North Carolina State University

reply via email to

[Prev in Thread] Current Thread [Next in Thread]