[opendtv] Re: France goes DTV
- From: "Donald Koeleman" <donald.koeleman@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 8 Feb 2005 00:21:16 +0100
DVB-S2 will go as high as 32 APSK. But don't expect to see that in any type
of mass market application or CE product. The new Pace HD H.264/mpeg2 HD
box, will only do 4 and 8 PSK. Companies like Thomson (sorry ST
Microsystems) only sell front-end chips limited to 4/8PSK.
My apologies for not trimming the thread below properly...
d.
----- Original Message -----
From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx>
Sent: Monday, February 07, 2005 11:06 PM
Subject: [opendtv] Re: France goes DTV
Bob Miller wrote:
> And you are suggesting the 8-VSB can go lower power?
Obviously. If you install as many transmitter sites as
they did in Paris et environs, for example, of course.
The CRC already played those games in Ottawa. It
works.
> You do see XM and Sirius using COFDM terrestrially.
But you don't see those systems using COFDM for their
long range coverage. Just for the local gap fillers.
For the long range, they use QPSK. If they move up to
higher spectral efficiencies, they talk about 8-PSK or
at most I've seen even 16-QAM. Not COFDM.
From the perspective of a transmitter wanting to
operate as close as possible to saturation, e.g. in
a satellite, 16-QAM is no different from 4-VSB. In
both cases, you use four amplitude levels, and you
achieve the same spectral efficiency.
Those are the tradeoffs. Long range unobstructed,
single carrier. Short range with obstacles, COFDM or
CDMA. Long range with obstacles? It's a gray area.
You have an advantage in power if you can make the
single carrier system work.
Bert
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