[opendtv] Canadian Broadcasters Test Digital SFN

From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
Date: Fri, 23 Oct 2009 16:29:22 -0500
The CRC getting in on the SFN act. Good deal.

Since the TV stations offering mobile DTV in Canada are, presumably, as in the 
US, the same stations that also offer fixed TV service, my take on this is that 
the SFN also applies to the regular ATSC streams. After all, what you're 
synchronizing is the 8-VSB symbols, and these carry all of the content.

My question is, how will the older receivers cope with this?

Bert

---------------------------------
http://www.tvtechnology.com/article/89262

Canadian Broadcasters Test Digital SFN
10.22.2009.

Rohde & Schwarz is collaborating with Moseley Broadcast and the Communications 
Research Centre Canada to create one of the first single-frequency network test 
beds for ATSC fixed and mobile digital television. The research and development 
agreement is being conducted under the auspices of the CRC.

The test bed will facilitate research and development on ATSC single-frequency 
networks, including field verification. The mobile test bed will cover about 
250 square kilometers in the Ottawa, Ontario area. In-depth evaluation and 
development will be conducted in a dedicated network using an available TV 
channel in Ottawa. The headend for the network is located at CRC facilities, 
with one transmitter on a communications tower at CRC and others on structures 
in and around Ottawa. A wireless wide area network was constructed in Ottawa to 
enable remote communications via Internet on a virtual private network for the 
remote labs, or field measurement vehicles for control and monitoring of all 
equipment in test bed.

The tests are expected to demonstrate the potential of ATSC mobile DTV 
technology to broadcasters and government regulators.

Rohde & Schwarz will provide ATSC mobile DTV SFN transmission equipment and 
expertise. The company is one of the pioneers in developing technologies used 
in the ATSC mobile transmission standard. Moseley Broadcast will supply the 
point-to-point microwave communication systems that link the head-end to the 
SFN sites. The CRC, having designed the SFN topology for Ottawa, will provide 
the transmitter sites along with its expertise in the area of digital 
television broadcasting research.

The ATSC mobile DTV standard was ratified last week last week. It opened the 
door for transmitting TV signals to handheld devices. Single-frequency networks 
use multiple transmission sites to enhance signal coverage.

"In an ATSC Mobile DTV SFN, multiple towers send the same program content at 
exactly the same time and on the same frequency," Rhode & Schwarz said. "This 
makes efficient use of spectrum resources, and the resulting transmitter 
diversity can help mitigate the challenges associated with mobile and fixed 
reception."
 
 
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[opendtv] Canadian Broadcasters Test Digital SFN

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