[opendtv] Re: Technology years
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 19 Jan 2007 16:05:32 -0500
Nat Ostroff wrote:
> Even with the large bit penalty of AVSB we may have
> something to work with.
Not sure the bit penalty of A-VSB is any more than any other solution,
for the same robustness level. That's why I compared how close it was to
the Shannon limit, in its most robust mode, against the Chinese new
standard. It is, if anything, closer.
It is perhaps preferable to start with a simpler constallation to
achieve more robustness, but once you have the processing power to use
extra coding, that is also a possibility. And it has the advantage that
the robust channels can be fine-tuned within the whole 6 MHz channel,
instead of being being cut out with a meat axe as you do with a separate
constellation.
Bert
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