[opendtv] Re: From Broadcast Engineering - WRAL tests mobile DTV
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 8 Aug 2008 15:54:29 -0400
Bob Miller wrote:
> OH!! Then there was that thing about DVB-T not being as
> efficient as 8-VSB. Something about DVB-T only being capable
> of 18.6 Mbps while 8-VSB could handle a whopping 19.34 mbps.
The problem with comparing spectral efficiency, we should always
remember, is that it makes no sense at all to compare it UNLESS you
include the threshold C/N ratio required for solid reception. Without
the *two* numbers, you can take any position you want and rant about it.
So in this case, the comparison is that with a slight drop in b/s/Hz,
you are also saddled with a 3 dB increase in the required signal margin.
Yes, it looks like in some modes DVB-T2 may address that issue. I'm
waiting for the results with baited breath.
Bert
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