[opendtv] Re: Mobile 8-VSB from Linx/Micronas
- From: dmenolan <dmenolan@xxxxxxxxxxxxxx>
- To: Open DTV list <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 11 Nov 2004 15:22:07 -0500
I have been away and not able to enter the debate. Very briefly: there is=
a very very big difference between portable indoor, mobile outdoor, and =
portable indoor reception. I recommend you do a google search on these ke=
ywords. There has been an enormous amount of research on this in in COFDM=
systems in the last few years. Diversity (spatial) is very easy to imple=
ment in COFDM systems because the second input is treated as another sign=
al and the MRC algorithms tracks the best signal. The benefits of diversi=
ty are to lower the C/N floor for a mobile Tv service ESR=3D0 (ie perfect=
) by 6-9dB compared to a single receiver and to double the Doppler perfor=
mance (this is key for high speed AND high data rates AND wide area SFNs)=
. Diversity DVB-T is on sale now. The target market is portable indoor LC=
D TVs and the in-car market (12V batteries rechargeable). Diversity exten=
ds the 64QAM fixed service to cars and improves portable indoor reception=
dramatically. (see the dibcom papers on this) It can be added in a recei=
ver for around $30 and is coming.
The requirements for handheld mobile are very different. Diversity is a n=
on-starter because of the form factor and small batteries. The power cons=
umption, in 2006, of a DVB-T receiver will be 600mW. It is possible to sh=
ow that this is ten times too large for a 3.6V cellular battery. The targ=
et is at least four hours TVTIME (another new measure to follow talk time=
and standbytime). As DVB-H implements burst transmissions using time-sli=
cing this is 90% more efficient than DVB-T for a cellular phone system. T=
his meets the requirements for a cellular phone TV system. It is also mor=
e power efficient than ISDB-T by some distance and offers higher data rat=
es too. BTW Nokia announced today that the first DVB-H cell phones will b=
e on sale in 2006.
It is not likely that 8VSB will support handheld TV as a) the front-end p=
ower consumption is too high and b) its doppler performance is very poor =
as seen all those years ago in the Brazil tests. It is also not clear whe=
ther 8VSB can support diversity reception: recall it took six years to pr=
oduce portable indoor reception.
Craig is, of course, right, the money is following the various COFDM syst=
ems...
Regards,
DN
-------------Forwarded Message-----------------
From: INTERNET:opendtv@xxxxxxxxxxxxx, INTERNET:opendtv@xxxxxxxxxxxxx
To: , INTERNET:opendtv@xxxxxxxxxxxxx
=
Date: 10/11/104 16:49 PM
RE: [opendtv] Re: Mobile 8-VSB from Linx/Micronas
=
At 10:32 AM -0500 11/10/04, Manfredi, Albert E wrote:
>This article could not have been more a propos.
Hmmmmmm...
I wonder why they are concentrating on COFDM first.
So now, I'll need even more power and diversity antennas to make VSB =
work for portable/mobile applications...
I am reminded of the good old days before the introduction of =
camcorders - you held the camera and carried a 20 pound U-matic =
recorder on a shoulder strap.
Regards
Craig
=
=
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Date: Wed, 10 Nov 2004 11:33:10 -0400
To: opendtv@xxxxxxxxxxxxx
From: Craig Birkmaier <craig@xxxxxxxxx>
Subject: [opendtv] Re: Mobile 8-VSB from Linx/Micronas
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