[opendtv] Re: The "real" problem with OFDM in the U.S.
- From: "John Shutt" <shuttj@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 7 Mar 2005 09:18:12 -0500
Perhaps the heavy price was the need for 3 dB more signal to equal the
fringe reception of ATSC. A point that Dr. McDonald consistently makes when
comparing COFDM to 8T-VSB.
In the real world testing in Baltimore in 1999, the fringe reception of
COFDM and 8T-VSB at equal average power was immeasurable.
Then there is the higher peak-to-average ratio of COFDM over 8T-VSB, which
would also require larger transmitters and their recurring expenses. But
again, for VHF stations that were assigned the maximum power, I don't think
that the loss of a couple of dB in the fringe in order to accommodate a
higher peak-to-average ratio would be measurable.
What would have been measurable was the markedly improved indoor and high
multipath reception performance of 2000 vintage receivers. Here we are in
2005 still waiting for delivered product that meets 1999 promises.
John Shutt
> Sorry, you completely lost me on that one. What heavy price are you
> talking about?
>
> - Tom
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