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Re: [Discuss-gnuradio] Fwd: Questions on rx_ofdm example in GR 3.7.1
From: |
Martin Braun (CEL) |
Subject: |
Re: [Discuss-gnuradio] Fwd: Questions on rx_ofdm example in GR 3.7.1 |
Date: |
Fri, 27 Sep 2013 07:54:52 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Sep 26, 2013 at 06:25:50PM +0000, Monahan-Mitchell, Tim wrote:
> > On Wed, Sep 25, 2013 at 04:57:55PM -0700, Daniel Domínguez wrote:
> >> The solution I found was to set the Fixed Frame Length parameter to 1
> >> on the OFDM Frame Equalizer block of the "Header Stream".
>
> > 1 is the correct setting. I'm currently adding a tx into the example so it
> > runs as-is (like benchmark).
>
> It would be interesting to keep the original diagram, and then also show a
> replacement diagram that instead uses the OFDM Demod block and any other
> newer ones that consolidate the equivalent function.
Nothing's going to change with the original diagram. I'll just add an
ofdm_tx so it runs in loopback mode.
> > The reason: The headers have constant length, therefore it is not necessary
> > to propagate them as tagged streams. The way the header/paylod demux work,
> > it splits off the header and passes that regularly. There's no need to
> > generate a length tag.
>
> Maybe that explains why my earlier issue about the Length Tag Key value for
> that same block does not matter (see GR issue # 593), since "1" implies it is
> not needed.
Yep, exactly.
MB
--
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)
Dipl.-Ing. Martin Braun
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