[opendtv] Re: Bob likes COFDM

  • From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
  • To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx>
  • Date: Mon, 21 Mar 2005 16:06:33 -0500

John Shutt wrote:

> Could you provide either a link or a title of the FCC
> test results?

John, I think this is what you're looking for:

http://www.fcc.gov/Bureaus/Engineering_Technology/Reports/oetrpt4901.doc


In case the URL gets messed up, the document is OET document
TRB-00-1.

Here's an exerpt from the executive summary:

"In the interim since COFDM was first analyzed in the US,
COFDM was chosen as the European broadcast digital
transmission system, i.e. Digital Broadcast Television -
Terrestrial or DVB-T, under a somewhat different broadcast
television system architecture, and has benefited from
substantial investment in development. In the rush to get
8-VSB consumer receivers to market in the US, the first
generation of receivers sold were implemented with channel
equalizer technology in a relatively early stage of
development. In the two years since the first receivers
were offered for sale, manufacturers have introduced sets
incorporating second-generation technologies, and have
developed prototype receivers using integrated circuit chip
sets with what now can be considered third-generation
technologies.

"The Commission was petitioned to allow COFDM as an
alternative to 8-VSB, with proponents of this position
offering field demonstrations purporting to show the
relative superiority of COFDM in difficult reception
conditions and emphasizing anecdotal failures of early
8-VSB consumer receivers.1 This controversy has, however,
spurred the continued development of the 8-VSB receivers,
particularly the channel equalizers, and also focused the
attention of the Commission on the need for an objective
and scientific analysis of the state of 8-VSB receiver
performance."

There might be more studies from the FCC, but that's the
quickest one I could find, and I remember reading it when
it first came out.

What they said way back then turned out to be true.
About one year after this was written, Linx demoed their
4th gen technology, which was easily better than the 3rd
gen receivers mentioned in this report. Although as we
all know, that doesn't mean the good stuff is on the
store shelves yet.

Bert
 
 
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