Dvb Technologies

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  • Topic: Digital television, DVB-T, Error detection and correction
  • Pages : 25 (6202 words )
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  • Published : May 13, 2013
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Digital Video Broadcasting - Handheld

DVB-H

Contents
1.Introduction4
1.1.Motivation for DVB-H4
1.2.Technologies before DVB-H4
1.2.1.Digital Multimedia Broadcast (DMB)4
1.2.2.Integrated Services Digital Broadcasting (ISDB)5
1.2.3.Media FLO5
1.3.DVB Technologies5
1.3.1.DVB-SH5
1.3.2.DVB-IPDC6
1.3.3.DVB-T7
1.3.4.DVB-H7
1.4.DVB-H vs. mobile streaming 3G8
1.5.Benefits of DVB-H9
1.6.Business Model10
1.6.1.New markets11
1.6.2.Revenue from subscription fees11
1.6.3.Increased advertising revenue11
2.Basic Operation of DVB-H12
2.1.Operational Overview12
2.1.1.Backward Compatibility13
2.2.Improvements on DVB-T physical layer13
2.2.1.4K IFFT mode14
2.3.DVB-T Modulation15
2.3.1.Inner and Outer coding16
2.4.C-OFDM Technology16
2.4.1.Frame Structure17
2.4.2.Symbols, Carriers and Cells18
3.DVB-H Features19
3.1.Time Slicing19
3.1.1.Delta-t method22
3.1.2.Hand Over Consideration23
3.2.MPE-FEC (Multi Protocol Encapsulation – Forward Error Correction)23 3.2.1.MPE-FEC Frame24
3.2.2.Performance of MPE-FEC25
4.DVB-H Network Planning26
4.1.SFN Networks26
4.2.Planning Parameters26
4.2.1.The FFT size26
4.2.2.Guard interval27
4.2.3.Modulation / Coding Rate29
4.3.Transmission Modes30
4.3.1.2K Mode30
4.3.2.4K Mode30
4.3.3.8K Mode31
4.4.DVB-H Network Configurations31

Introduction

1 Motivation for DVB-H

Over the last ten years digital technology has encouraged a rapid growth in the personal consumption of media. The advent of personal video recorders (PVRs), video-on-demand and the multiplication of program offerings have enabled viewers to personalize the content that they want to watch. And with interactivity, viewers can directly express their preferences to broadcasters.

As part of this trend, and alongside the growth of mobile telephony, new technologies have been developed that enable viewers to watch streamed television-like services on their mobile telephone. The place of viewing is no longer limited to the television receiver at home, or in a vehicle, but is widened to allow personalized viewing of television by individuals wherever they are located.

The development of the Digital Video Broadcasting to a Handheld (DVB-H) standard makes it possible to deliver live broadcast television to a mobile handheld device. Building upon the strengths of the Digital Video Broadcasting - Terrestrial (DVB-T) standard in use in millions of homes, DVB-H recognizes the trend towards the personal consumption of media.

2 Technologies before DVB-H

The concept of providing television-like services on a handheld device has generated much enthusiasm. Already, mobile telecom operators are providing video streaming services using their UMTS networks, or third-generation networks. However, the main alternatives to providing live television services on a handheld device currently available are DMB, ISDB-T, Media FLO and now DVB-H.

3 Digital Multimedia Broadcast (DMB)

Digital Multimedia Broadcast (DMB) delivers mobile television services using the Eureka-147 Digital Audio Broadcast (DAB) standard with additional error-correction. T-DMB uses the terrestrial network in Band III and/or Band L while S-DMB uses the satellite network in Band L. While the first convergent mobile phone DMB products developed made use of satellite frequency, LG Electronics presented the first T-DMB receiver with a mobile phone in November 2004. DMB trials are to take place in Korea this year. A trial for S-DMB began in January 2005 while a T-DMB trial is expected to begin in May 2005.

4 Integrated Services Digital Broadcasting (ISDB)

Integrated Services Digital Broadcasting (ISDB-T), developed by Japan as its digital terrestrial television standard, and...
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