[opendtv] Re: Ed Williams 1999 Sinclair Baltimore Report
- From: Terry Harvey <tjharvey@xxxxxxx>
- To: opendtv@xxxxxxxxxxxxx, "OpenDTV" <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 25 Mar 2005 22:02:33 -0700
Note that the way some may read Ed's post may be misinterpreted.
My interpretation is that the gross data rate was 24.88Mb/s for COFDM in a
slightly greater bandwidth than 8VSB, such that it would not fit in a six
MegaHertz channel. The net data rate was 18.66Mb/s. (The 1/8 guard interval
I expect eats up available bandwidth).
8VSB gross data rate is approx 31 Mb/s in a narrower channel and the net
data rate is 19.39 Mb/s. This means more FEC has been applied to 8VSB
transmission.
As the pre-adaptive equalization processes improve, does this not prove
that 8VSB will have in future greater data rate vs bandwidth efficiency for
the same robustness of reception?
Terry Harvey
------------------------------------------
Ed Willam's post (snip)
> The COFDM system operated in 2K, 64QAM, 3/4 FEC, 1/8
>spacing, 24.88 Mbps gross data rate mode. Useful data rate for 8-VSB data
>rate was 19.39 and COFDM was 18.66 Mbps. Close enough for useful comparison.
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