[opendtv] Re: COFDM and equalization
- From: Bob Miller <bob@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 21 Apr 2004 10:36:39 -0400
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
>>
>>
>>----------------------------------------------------------------------
>>You can UNSUBSCRIBE from the OpenDTV list in two ways:
>>
>>- Using the UNSUBSCRIBE command in your user configuration settings at
>>
>>
>FreeLists.org
>
>
>>- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
>>
>>
>unsubscribe in the subject line.
>
>
>>
>>
>
>
>
>----------------------------------------------------------------------
>You can UNSUBSCRIBE from the OpenDTV list in two ways:
>
>- Using the UNSUBSCRIBE command in your user configuration settings at
>FreeLists.org
>
>- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
>unsubscribe in the subject line.
>
>
>
>
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts:
