Download - DVB -H Presentation
-
7/28/2019 DVB -H Presentation
1/21
Comnet 4 Digital Video Broadcasting Presentation
Waldon Hendricks-204520231
Jason Poggenpoel-210105259
13 May 2013
-
7/28/2019 DVB -H Presentation
2/21
Plagiarism Statement
The work attached is my* own, original work, i.e. free of
plagiarism. All sources used in this work have been
referenced, using the Harvard Referencing system of in-
text and end-of-text referencing.
Signed: J.Poggenpoel Date: 12 May 2012
Signed: W.Hendricks Date: 12 May 2012
-
7/28/2019 DVB -H Presentation
3/21
Content Page
Introduction to DVB
Types of DVB standards
Why DVB-H
Brief introduction to DBV-T
What is DVB-H Features of DVB-H
DVB-H and DVB-T system compatibility
Modulation used by DVB-H
Conclusion
References
-
7/28/2019 DVB -H Presentation
4/21
Introduction to DVB
www.dvb.org defines the DVB project as an alliance of
250-300 companies, which originally was from European
origin but is now world wide.
Its an open, private sector initiative with a yearly
membership fee
The objective set out are to agree to specifications for the
delivery of digital media delivery systems and also
broadcasting
Before being renamed The DVB project in September
1993 it was first called ELG
-
7/28/2019 DVB -H Presentation
5/21
DVB Standards
DVB consists of a variety of standards they are:
DVB-S (Satellite)
DVB-S2 (2
nd
Generation Satellite) DVB-T (Terrestrial)
DVB-C (Cable)
DVB-H (Handheld)
DVB-SH (Satellite Handheld) DVB-IPDC (Internet Protocol Datacast)
-
7/28/2019 DVB -H Presentation
6/21
Why DVB-H
We selected DVB-H due to it being a standard which
caters for mobile devices.
Technology is constantly changing, with streaming and
satellite television being made available for handheld
devices
Handheld devices are compact devices which are
becoming very much advanced and also the majority of
people today have handheld devices or have come intocontact with them from pdas to cell phones.
DVB-H would cater to handheld users by allowing them
the ability to stream media on their devices
-
7/28/2019 DVB -H Presentation
7/21
Brief introduction to DBV-T
First version developed in 1997
Most widely adopted DTT system in the world
DVB-H is adapted from DVB-T with backwardcompatibility
Uses OFDM and carries 2k and 8k modes
Makes use of QPSK, 16QAM, and 64QAM
Uses Mpeg2 as its transport service
-
7/28/2019 DVB -H Presentation
8/21
What is DVB-H?
DVB-H (Handheld) is a standard for carrying multimedia
services over digital terrestrial broadcasting networks to
handheld terminals.
It became a formal standard in November 2004
When broadcasting to handhelds was discussed for the
first time it was in context to DVB-Ts proven mobile
performance
Mobile TV, video streaming and file downloads were what
they wanted to achieve in handheld devices taking into
consideration the battery consumption and reception of
these devices
-
7/28/2019 DVB -H Presentation
9/21
What layers does DVB-H incorporate?
DVB-H makes use of elements in both the physical and
link layer
The link layer- time slicing and forward error correction
multiprotocol encapsulated data (MPE-FEC)
The physical layer DVB-H signalling, DVB-H
Interleaving and the use of 4k mode being an
incorporated in DVB-H
-
7/28/2019 DVB -H Presentation
10/21
Time Slicing
Mobile T.V should ensure battery drain is kept to a
minimum
Time slicing reduces the battery consumption
To aid in the support of seamless transmission
About 90% of power consumption is reduced for a
receiver using time slicing compared to one that is not
Additional power will obviously be added which will add
to the battery draining but not as much as without the use
of time slicing
-
7/28/2019 DVB -H Presentation
11/21
MPE-FEC
Aims to improve carrier to noise performance and
Doppler performance in mobile channels.
Another aim is that it is used to improve tolerance to
impulse interference.
These link layer items do not touch the DVB-T physical
layer
-
7/28/2019 DVB -H Presentation
12/21
Physical layer
DVB-H uses 4k mode catering for trade off mobility and
SFN cell size
In-depth symbol inter leaver in 2k and 4k modes catering
for the improvement in robust mobile networks and to
support interference
DVB-H signalling, which is mandatory for DVB-H
-
7/28/2019 DVB -H Presentation
13/21
Time Slicing Diagram
-
7/28/2019 DVB -H Presentation
14/21
DVB-H and DVB-T system compatibility
-
7/28/2019 DVB -H Presentation
15/21
-
7/28/2019 DVB -H Presentation
16/21
Modulation and frequency used by DVB-H
DVB-H makes use of OFDM as a form of transmission
QPSK, and 16QAM are modulation techniques which are
used with OFDM
QPSK offers best reception under low signal and high
noise conditions
The frequency used by DVB-H is the same frequency
used by DVB-T, it is Ultra High Frequency (UHF)
-
7/28/2019 DVB -H Presentation
17/21
Current devices in South Africa that support DVB-H
There are not many devices supporting DVB-H, the
devices that do support DVB-H are the Nokia N96, Nokia
5330 (mobile-TV), DSTV Drifter just to name a few.
-
7/28/2019 DVB -H Presentation
18/21
Conclusion
DVB-H is backward compatible with DVB-T but alsointroducing some specifications to cater for handhelddevices
DVB-H carries only IP datagrams DVB aids in power consumption for handheld devices
It introduces time-slicing
It provides in-depth interleaves in the 2k and 4k modes,
making them act like 8k nodes Makes use of DVB-Ts multiplexer
Uses IPDC
Next step is DVB-SH
-
7/28/2019 DVB -H Presentation
19/21
Referencing
DVB - Digital Video Broadcasting - DVB-H. 2013. DVB -
Digital Video Broadcasting - DVB-H. [ONLINE] Available
at: http://dvb.org/technology/dvb-h/. [Accessed 11 May
2013]. . 2013. . [ONLINE] Available at:
http://www.etsi.org/deliver/etsi_en/300700_300799/30074
4/01.05.01_40/en_300744v010501o.pdf. [Accessed 11
May 2013].
-
7/28/2019 DVB -H Presentation
20/21
DVB - Digital Video Broadcasting - History of the DVB
Project. 2013. DVB - Digital Video Broadcasting - History
of the DVB Project. [ONLINE] Available at:
http://dvb.org/about_dvb/history/. [Accessed 11 May2013].
. 2013. . [ONLINE] Available at:
http://dvb.org/technology/fact_sheets/DVB-
T_Factsheet.pdf. [Accessed 12 May 2013].
-
7/28/2019 DVB -H Presentation
21/21