[opendtv] Re: Technology years
- From: "Bob Miller" <robmxa@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 21 Jan 2007 01:09:07 -0500
On 1/20/07, Albert Manfredi <bert22306@xxxxxxxxxxx> wrote:
Bob Miller wrote:
>But the thing I am interested in most and thinking about
>most does not use OFDM.
That's trivial. Satelllites don't, 3G cellular phones don't, most of the
deployed 802.11 don't, cable systems don't, PON networks like Verizon FiOS
don't, and the more technically successful of UWB schemes don't either.
Satellites use single carrier and MPEG-2 TS, not so different from ATSC.
I wouldn't use OFDM for satellite either, what is that about? 3G
phones? Maybe 4G phones. I hear that the next generation will be using
COFDM at least Qualcomm is working on it. And why would a PON network
need COFDM?
Don't know how you separate out 802.11 a, b and g. Most sales have
been and are for a long time now been of dual or tri units. Only the
first and the slowest is not OFDM, b. The future of 802.11 is looking
like more and more OFDM across the board. Suggesting that 802.11 b is
the widest deployed at the moment in this context has virtually no
meaning.
As to UWB Bluetooth had decided on an OFDM version. Could you list
some of the "more technically successful of UWB schemes".
http://whitepapers.techrepublic.com.com/whitepaper.aspx?docid=236835
Here is a technical version of OFDM UWB.
http://whitepapers.techrepublic.com.com/whitepaper.aspx?docid=102958
Intel is on the OFDM side of this and wants to incorporate UWB into
their reference designs. I will bet on Intel and OFDM UWB.
And what is trivial about what?
Bob Miller
I see this obsession overt COFDM very much in the same light as the
obsession over ethanol fuels. The best thing you can say about ethanol fuels
is that they serve the causes of politicians who need pork barrel programs
to get votes. Gullible constituents get hooked and reeled in by the
rhetoric, and won't they be surprised when they discover that this facile
solution doesn't solve anything.
I think Tom has by far the best solution. We need to make sure nothing will
further delay the switch-off date of analog TV. Only then will the
broadcasters and the FCC focus on the real issues, instead fo being time and
time again sidetracked by the special interests and their clever
manipulation of their information-challenged audiences.
Bert
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