[opendtv] Re: SFN response to Craig's post
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 24 Apr 2007 14:11:13 -0700
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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