[opendtv] Re: SFN response to Craig's post
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 25 Apr 2007 04:55:41 -0400
It is probably cheaper to buy Doug's patents than to have done the R & D.
----- Original Message -----
From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Tuesday, April 24, 2007 5:11 PM
Subject: [opendtv] Re: SFN response to Craig's post
> Bert wrote:
> > It seems to me that it would be good to
> > improve mobile reception of regular 8T-VSB, e.g. using diversity
> > antennas, Doug's dynamic equalization from the data symbols (rather than
> > SRS), and perhaps even a truly backward compatible 1/3 rate turbo coded
> > stream for extra robustness in special cases.
>
> Unfortunately, it's unlikely that the CE folks will invite Doug to their
IP
> party.
>
> Dale
>
> > -----Original Message-----
> > From: opendtv-bounce@xxxxxxxxxxxxx
> > [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Manfredi, Albert E
> > Sent: Tuesday, April 24, 2007 1:46 PM
> > To: opendtv@xxxxxxxxxxxxx
> > Subject: [opendtv] SFN response to Craig's post
> >
> >
> > Craig Birkmaier wrote:
> >
> > > One thing that was not discussed much here was the SFN portion of
> > > the AVSB demo.
> >
> > Mark Schubin did talk about the SFN demo. He said that reception of the
> > signal from the three 100W transmitters in the SFN was as reliable as
> > reception from the big stick from Black Mountain, with the receivers in
> > use. Which is good news.
> >
> > But the missing piece is, how did the coverage area differ? You can't
> > compare without that last bit of info.
> >
> > Also, my guess is that the area covered by the 100W three-stick SFN was
> > very small compared with the area covered covered by the big stick. So
> > my reaction was, and is, that this is particularly good news for the big
> > stick. I mean, for the more typical broadcaster trying to cover a
> > typically huge US TV market, what better news than to say that the big
> > stick works just fine for mobile reception? As opposed to having to
> > deploy a forest of small sticks?
> >
> > But really, you need coverage area comparisons, with ease of reception
> > as you move away from the big stick or from the SFN small sticks, to
> > draw any definitive conclusions. In Berlin and in Paris, there seems to
> > be no magic in terms of coverage area vs power of the SFN towers.
> >
> > Maybe the lesson from DVB-T countries with DVB-H service is not mature
> > enough, and therefore invalid. It seems to me that it would be good to
> > improve mobile reception of regular 8T-VSB, e.g. using diversity
> > antennas, Doug's dynamic equalization from the data symbols (rather than
> > SRS), and perhaps even a truly backward compatible 1/3 rate turbo coded
> > stream for extra robustness in special cases. The fact that USB ATSC
> > receivers are somewhat popular is a pretty good indication that this
> > route would work. And is apparently echoed across the pond, with DVB-T
> > USB sticks, as opposed to DVB-H.
> >
> > Another point not meant to offend anyone. If one is demoing a new
> > transmission mode of ATSC, e.g. MPH, is that organization going to be
> > incentivized to optimize 8T-VSB for mobility at the same time?
> >
> > Bert
> >
> >
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>
>
>
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