DVB -H Presentation

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Comnet 4 Digital Video Broadcasting Presentation

Waldon Hendricks-204520231

Jason Poggenpoel-210105259

13 May 2013


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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


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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


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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


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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)


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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


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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


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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


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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


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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


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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


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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


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Time Slicing Diagram


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DVB-H and DVB-T system compatibility


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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)


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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.


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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


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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].


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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].


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DVB -H Presentation

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