[opendtv] Re: COFDM and equalization
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 21 Apr 2004 23:26:46 -0400
Multiple carriers with narrowband QAM constellations as opposed to wideband
QAM constellations on a single center-channel carrier.
Al
----- Original Message -----
From: "Bob Miller" <bob@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Wednesday, April 21, 2004 10:36 AM
Subject: [opendtv] Re: COFDM and equalization
> Since the most widely used modulation with COFDM is QAM how does the use
> of COFDM change QAM?
>
> Bob Miller
>
> Allen Le Roy Limberg wrote:
>
> >I think you have it backwards, Craig. COFDM needs higher power to reach
> >same radius, which makes it a worse co-channel interferor to other
signals
> >than QAM or 8VSB.
> >
> >Al Limberg
> >
> >----- Original Message -----
> >From: "Craig Birkmaier" <craig@xxxxxxxxx>
> >To: <opendtv@xxxxxxxxxxxxx>
> >Sent: Tuesday, April 20, 2004 4:40 PM
> >Subject: [opendtv] Re: COFDM and equalization
> >
> >
> >
> >
> >>At 6:35 AM -0700 4/20/04, Doug McDonald wrote:
> >>
> >>
> >>
> >>> Our town is an
> >>>excellent example: we are right on the boundary
> >>>of a certain Fox dtv station, and 3 dB really
> >>>does make a big difference: people on the
> >>>east side of town seem to be unable, normally,
> >>>to get it: but with a 0.5 dB NF preamp I have tried
> >>>at a couple of places, instead of a 4 dB NF preamp,
> >>>they get it. Thus, 3 dB more transmitter power
> >>>and it would work ... and with COFDM, the
> >>>edge would move about 4 miles west: to the edge
> >>>of town, and very very few would get it. Thus,
> >>>POWER REALLY DOES MATTER, and our town shows why
> >>>we made the right choice.
> >>>
> >>>
> >>As I recall that station is not licensed to serve your market.
> >>
> >>More power just means that their signal will encroach on more ares
> >>that are not in the market for which the station is licensed.
> >>
> >>If my recollections are incorrect, I apologize in advance.
> >>
> >>Regards
> >>Craig
> >>
> >>
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> >>
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> >
> >
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