DIGITAL VIDEO BROADCASTINGDIGITAL VIDEO BROADCASTING--HANDHELDHANDHELD

SREEJITH RSREEJITH RSREEJITH RSREEJITH R

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INTRODUCTIONINTRODUCTION

The DVBThe DVB--H technology is a spinH technology is a spin--off of the off of the DVBDVB--T standard. T standard. Delivery of TV,Radio and Data content to Delivery of TV,Radio and Data content to y ,y ,handheld deviceshandheld devicesTo increase the battery usage duration inTo increase the battery usage duration inTo increase the battery usage duration in To increase the battery usage duration in handheld deviceshandheld devicesDVBDVB H is the latest development within theH is the latest development within theDVBDVB--H is the latest development within the H is the latest development within the set of DVB transmission standardsset of DVB transmission standards

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DVBDVB--T ( Predecessor of DVBT ( Predecessor of DVB--H)H)DVBDVB T ( Predecessor of DVBT ( Predecessor of DVB H)H)

It is the DVB European consortiumIt is the DVB European consortiumIt is the DVB European consortium It is the DVB European consortium standard standard

Transmits a compressed digital Transmits a compressed digital di / id t idi / id t i OFDMOFDMaudio/video stream, using audio/video stream, using OFDMOFDM

modulation modulation

The adopted source coding methods are The adopted source coding methods are

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p gp gMPEGMPEG--22

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DVBDVB--TT

Th i t f th DVBTh i t f th DVB T S t ( h i Fi 1)T S t ( h i Fi 1)

Fig:1

The main components of the DVBThe main components of the DVB--T System are (as shown in Figure 1)T System are (as shown in Figure 1) ::

Network Provider ( DVBNetwork Provider ( DVB--T Transmitter & Mux)T Transmitter & Mux)Content ProviderContent ProviderContent ProviderContent ProviderBroadcast ProviderBroadcast ProviderCustomer ( Digital TV & Fixed Antenna )Customer ( Digital TV & Fixed Antenna )

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NEED FOR DVBNEED FOR DVB--HHThe DVB-T cannot be used because

W d i d f ft ti• Was designed for rooftop reception

• Not suitable for handheld battery poweredNot suitable for handheld battery powereddevices

Inadequate impulse noise protection

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DVBDVB--HHDVBDVB HHThe main components of the DVB-H

System for downlink are :System for downlink are :

• Content Provider

• Broadcast Provider

• Network Operator ( DVB-H Codec, DVB-T Transmitter & Mux)

• Customer ( Mobile TV)

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TIME SLICINGTIME SLICING

Special problem for DVBSpecial problem for DVB--H terminals is H terminals is the limited battery capacitythe limited battery capacityWhole data stream has to be decoded in Whole data stream has to be decoded in DVBDVB--TTIn DVBIn DVB--H,the data transmission is H,the data transmission is discontinuousdiscontinuousWith DVBWith DVB--H, service multiplexing is pure H, service multiplexing is pure timetime--division multiplexdivision multiplex

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IP over DVBIP over DVB--H technology makes TV H technology makes TV bilbilmobilemobile

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MOBILE TERMINALMOBILE TERMINALFE

WLAN CPU

Mediadecoder

Display

CellularLink

CPU

The Mobile Terminal consists of the following components:• Front End, contains radio receiver and demultiplexer• Media Decoder• CPU• Display

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MERITSMERITSMERITSMERITS

Cost efficient delivery of broadcast contentCost efficient delivery of broadcast contentCost efficient delivery of broadcast content Cost efficient delivery of broadcast content to a large audienceto a large audience Low complexityLow complexity Low complexityLow complexity Flexible transport stream sharing between Flexible transport stream sharing between

DVBDVB T d DVBT d DVB HHDVBDVB--T and DVBT and DVB--HH Allows seamless handoverAllows seamless handover

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CONCLUSION & FUTURE OF DVBCONCLUSION & FUTURE OF DVB--HHCONCLUSION & FUTURE OF DVBCONCLUSION & FUTURE OF DVB HH

Provide new business possibilities for aProvide new business possibilities for aProvide new business possibilities for a Provide new business possibilities for a variety of players variety of players The power saving is given by time slicingThe power saving is given by time slicingThe power saving is given by time slicingThe power saving is given by time slicingWell received by various operators, both Well received by various operators, both b d t d t lb d t d t lbroadcast and telecom.broadcast and telecom.Several pilot networks are running in Several pilot networks are running in various parts of the world various parts of the world

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REFERENCESREFERENCES

1. http://www.dvb-h.org/technology.htm2 http://ieeexplore ieee org/2. http://ieeexplore.ieee.org/

a. Proceedings in IEEE ; Publication Date: Jan. 2006b. IEEE Communications Surveys & Tutorials • 4th Quarter 2006(A SURVEY OF HANDOVER ALGORITHMS IN DVB-H))

3. EN 302 304 "Transmission System for Handheld Terminals (DVB H)“Handheld Terminals (DVB-H)

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