[opendtv] Re: Mobile TV: $2 Billion in Ad Buys

At 11:58 AM -0400 4/22/08, Manfredi, Albert E wrote:

Give it a rest, Craig. Mandatory integrated receivers are going to exist
also in DVB-T countries, for sure Italy and France, and integrated
receivers have been selling very well even before the mandate cuts in.
So this supposed burden of an integrated receiver is a universal issue.
And yes, it will likely delay adoption of DVB-T2.


Can you provide any links to information about receiver mandates in Europe?
I am not aware of any such mandates. What the marketplace decides is another issue entirely, and each market is unique in its requirements and the demand of OTA receivers. 


Are you just complaining, or do you know of some new features the NAB is
aching to add to DTT? If the latter, I think they should definitely move
forward. From what I can tell, all you're doing is complaining on
principle.
The NAB has nothing to do with it, other than their endorsement of the efforts of the Mobile Coalition. And this is only related to the MPH standard, not changes to the underlying ATSC standard, the basis for the FCC receiver mandate.
I have no idea what the ATSC is planning in this area other than the rumors I have heard. And I have no idea how the FCC might react to any changes in the base standard. My educated guess is that the ATSC would not seek FCC approval for any changes, nor would they try to get the FCC to mandate that any enhancements be required in new receivers. The FCC mandate was designed to facilitate the DTV transition. As this would be a post-transition change, I suspect that it would be up to the CE vendors to implement any enhancements.
And ultimately it would be up to broadcasters to use any enhancements, knowing that the existing population of ATSC receivers would not be able to use these enhancements. By the time all of this happens, I expect that the broadcasters will be far more concerned about having popular content to broadcast, and how they are going to survive when the content oligopoly pulls the plug on OTA broadcasting. 


So, what is DVB-T2? Since you claim to know, please explain.




Requirements:
http://www.dvb.org/technology/dvbt2/a114.cm0831r1.CRs_DVB-T2.pdf


Boilerplate:
http://www.dvb.org/technology/dvbt2/index.xml

Specifics (from Wikipedia)
http://en.wikipedia.org/wiki/DVB-T#The_DVB-T2_draft_standard


The DVB-T2 draft standard
From documents published on the Internet by RAI and others, the following characteristics are expected for the T2 standard:[5]
- Modulation will be standard COFDM in one of the modes QPSK, 16-QAM, 64-QAM, or 256-QAM (but not 128-QAM).
- OFDM modes will be 1k, 2k, 4k, 8k, 16k and 32k. The symbol length for 32k mode will be about 4 ms.
- Guard intervals will be 1/128, 1/32, 1/16, 19/256, 1/8, 19/128, and 1/4. (For 32k mode, the maximum is 1/8.)
- FEC will be LDPC and BCH (as in DVB-S2), with rates 1/2, 3/5, 2/3, 3/4, 4/5, and 5/6.
- There will be fewer pilots, in 8 different pilot-patterns, and equalization will be based also on the RAI CD3 system.
- In the 32k mode, a larger part of the standard 8 Mhz channel can be used, adding about 2% extra capacity. 

- DVB-T2 will be specified for 1.7, 5, 6, 7, 8, and 10 MHz channel bandwidth.
- MISO (Multiple-Inputs Single-Output) may be used (Alamouti scheme), but MIMO will not be used. Diversity receivers can be used (as they are with DVB-T).
- Bundling of more channels into a SuperMUX (called TFS) is not in the standard, but may be added later.
An example for a UK MFN DVB-T profile (QAM64, 2k, CR2/3, GI1/32) and a DVB-T2 equivalent (QAM256, 32k, CR3/5, GI1/128) shows an increase in bit rate from 24.13 Mbit/s to 35.4 Mbit/s (+46.5%).
Another example is an Italian SFN DVB-T profile (QAM64, 8k, CR2/3, GI1/4) and a DVB-T2 equivalent (QAM256, 32k, CR3/5, GI1/16): it shows an increase in bit rate from 19.91 Mbit/s to 33.3 Mbit/s (+67%).
At NAB there was some discussion about using MIMO. This might make it's way into the standard, but would be used primarily for new deployments. If a country has a significant user base with single antennas, as in the U.K. MIMO would not be used. 

Regards
Craig


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