[opendtv] Re: News: Single-frequency network proposed for over-the-air transmission in New York City
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 5 Sep 2007 21:49:28 -0400
DTR syncs the precoder and trellis coder in each transmitter, so all
transmitters have the same modulating signal. This is aside from the type
of modulation subsequently used.
Al Limberg
----- Original Message -----
From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Wednesday, September 05, 2007 6:53 PM
Subject: [opendtv] Re: News: Single-frequency network proposed for
over-the-air transmission in New York City
> John Shutt wrote:
>
> > Please explain why you wouldn't need to synchronize COFDM SFN
> > transmitters?
>
> You can, but you don't need to, because you have so much echo tolerance
> available if you increase the GI to at least 1/8 (and 8K mode of
> course). So that's what they seem to do in COFDM SFNs. I'm talking about
> the practical ones, small area SFNs.
>
> If you do synchronize towers, then you can probably tweak the spectral
> efficiency up again there too.
>
> All goes to show that the more time passes, the more alike all these
> schemes end up becoming.
>
> Bert
>
>
> ----------------------------------------------------------------------
> You can UNSUBSCRIBE from the OpenDTV list in two ways:
>
> - Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
>
> - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
>
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts:
