[opendtv] Re: SFN response to Craig's post

One point that needs to be kept in mind is that any Broadcaster mobile or
portable service needs to, as closely as possible, replicate the service
offered by the Cell Phone boys if the Broadcaster service is not to be
viewed as a secondary service. That means SFN type gap fillers for inside
structures and shadowed areas. Simple, low cost, SFN is a very important
feature of any sucessful Broadcaster portable service.

Nat Ostroff
----- Original Message ----- 
From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Tuesday, April 24, 2007 4:46 PM
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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