A-VSB - Samsung

The world is your living room.
A-VSB: The first step toward mobile broadcast TV
More than anything, A-VSB will help the North American market take the first critical steps to achieving a new type of portable
and mobile TV. With the improved reception performance of A-VSB, watching TV using portable devices becomes possible,
even in an environment where there are many dynamic multi-path interferences (e.g. TVs in laptop PCs, kitchen TVs, etc.).
Also, Samsung’s several private test results show that you can receive A-VSB signals even when you are moving at fast highway speeds.
www.samsungprinter.com
Laptop TV
Kitchen TV
Outdoor TV
Back-Seat TV
A-VSB is REAL...
To learn more about the technology and the working system, visit us at the following occasions during
NAB 2007 week.
- ATSC/NAB HotSpot for a booth demo
- Real-time mobile demo on a demo bus (invited guests only)
- Presentation at the Broadcast Engineering Conference
· April 18, 2007 2:00PM - 3:30PM
Backyard TV
Handheld Mobile TV
For more Information
John Godfrey, Samsung / 1-202-887-5667 / [email protected]
Mike Simon, Rohde & Schwarz / 1-410-910-7834 / [email protected]
Design and Specifications are subject to change without notice.
Trademarks of other companies mentioned in these publications are hereby recognized and acknowledged.
imagine the world is your living room
A-VSB : The Next Generation DTV Technology
Advanced-VSB Fact Sheet
Reception Performance
Why ATSC Mobile with A-VSB?
Samsung Electronics and Rohde & Schwarz have partnered to develop a dramatic enhancement to the Advanced Television
Systems Committee (ATSC) digital TV transmission standard. This technology is now being standardized in ATSC, with field
testing under way and a completed open standard targeted for this year.
To show the effectiveness of SRS in dynamic multi-path fading channels, each stream (ATSC normal stream, ½ rate Turbo
coded stream, and ¼ rate Turbo coded stream) was tested with and without SRS; a TOV (Threshold of Visibility) improvement
of up to 10 dB was evaluated when using the Turbo stream ¼ rate coding. The Turbo stream ¼ rate code with SRS was receivable with only 4 dB of SNR (signal-to-noise ratio), which means strong robustness. The 1/4 rate coded Turbo stream with
SRS was receivable at a speed of 171 MPH.
In February 2009, all broadcasters will be required to cease analog broadcasts in favor of digital. A-VSB is a potential solution to provide a sound transition that uses limited operational expenses for broadcasters. Using A-VSB technology, broadcasters would be able to open new portable and mobile TV markets using their own stations and channels.
Single Frequency Network (SFN)
Possible Service Model of Broadcast Channels
By choosing certain components of the technology, broadcasters can transmit various types of contents using appropriate
service models. With scalable characteristics of each technical component, A-VSB helps broadcasters fully utilize over 40
channel frequencies in their TV broadcaster bandwidth. The table below shows some of the examples for possible service
models.
Service Model
Mobile Reception
Portable Reception
Digital HDTV
Main Stream
Bandwidth
[Mbps]
SRS
[Mbps]
Mobile
Channel
Capability
16.5~18
1.2~2.9
No service
available
• Prime time delivery of full HD contents of major networks
• Portable, laptop TV in dynamic multi-path environments
12~16
1.2~2.9
1~2
QVGA/SD
Channel
• HD and mobile service in multi-streams
• Mobile broadcasting with local news and weather
Approx. 3
(one SD program)
1.2~2.9
5~10
QVGA/SD
Channel
• Retransmitting
contents acquired from major networks to
portable/handheld devices (duopoly markets)
Full HD
Service Model
Multi-Stream Model
What is Advanced-VSB?
Advanced-VSB (A-VSB) builds on the current ATSC transmission standard to enhance the receivers’ ability to receive the main TV transport stream indoors and in dynamic environments (e.g. in crowded public spaces such as sporting events). It also enables broadcasters to include multiple “Turbo
coded” streams with additional error correction and time diversity encoding for mobile reception at vehicle speeds, to enhanced receivability when signal
strength is weak relative to noise. In addition, A‑VSB eases synchronization of multiple transmission towers in a Single Frequency Network (SFN), which
can improve coverage with higher uniform signal strength throughout a service area, even in locations that normally would be shielded by obstacles such
as hills or buildings.
ATSC-M/H Centric Model
Main TV Stream
Does not affect current DTV sets.
A-VSB technology is backward compatible with today’s ATSC receivers. Several private tests in the actual broadcasting field have proven that it does
not have any negative impact with current broadcasting systems.
Usage Scenarios
SRS
Turbo-Coded Mobile Stream
ATSC Payload (19.39Mbps)
How does A-VSB work?
A broadcaster adds a specified Supplementary Reference Sequence (SRS) to the transmitted signal. A-VSB receivers utilize the SRS to remain “locked
in” to the transmission. This helps maintain reception of the main stream and any Turbo stream(s) even with rapidly changing multi-path interference, such
as when the signal is reflected from moving objects near the receiver or when the receiver itself is moving.
Is A-VSB backward compatible?
Yes, A-VSB is compatible with legacy digital TV receivers. Legacy receivers ignore the added SRS and Turbo-coded information in the signal while
continuing to receive the main TV stream (e.g., high definition TV programming.) Moreover, as A-VSB helps broadcasters deploy SFNs to fill gaps in the
coverage of their service area, even owners of legacy receivers may find their reception is improved.
Live TV
Interactive
Service
Pseudo-Live
Broadcasting
Digital Versatile
Terrestrial Service
Will A-VSB enable mobile TV?
Yes. Our research, field tests, and live demonstrations (including the demo in January 2007 at International Consumer Electronics Show in Las Vegas)
show that A‑VSB Turbo streams are receivable even when the receiver is moving rapidly in a typical urban environment. With additional work such as
miniaturization of antennas and tuners and power management, A-VSB will enable both portable and mobile digital TV reception direct from the local TV
station.
Content
Streaming
InfoCasting
Various scenarios can be realized with A-VSB according to broadcasters’
and consumers’ needs. Starting with simple live mobile TV, data-casting of
local information including weather and traffic news can be realized. Using the
robust auxiliary stream that A-VSB offers, content can be downloaded to a
device with storage media, and content-push service can be also enabled.
Current infrastructure can be re-used.
• utilizes coast-to-coast footprints of broadcasters
• no new channel frequency needs to be purchased
A-VSB technology enables broadcasters to start a portable and mobile TV business using their current stations and channel frequencies.
Among the broadcast channels that become effective after the analog shut-off, some channels may provide full HD service including five major networks. Others may provide multi-stream service with reasonable HD quality. This still leaves a number of channels available for broadcasters to start a
new business, including mobile TV service in the duopoly markets they own across the nation.