dvb h introduction and little information

1. DVB- H Introduction

2. Introduction
• DVB-H aims to provide digital TV reception to mobile devices.
• Combines traditional television broadcast standards with elements
specific to handheld devices; mobility, smaller screens and antennas,
indoor coverage and reliance on battery power

3. Motivation for creating DVB-H
• Why not use UMTS?
• Not scalable for mass content delivery
• For delivery of mass media content, broadcast networks should be preferred over point-to-
point cellular networks
• Why not use DVB-T?
• Was designed for rooftop reception
• Need for an efficient power saving mechanism
• Inadequate impulse noise protection
• Why not use DAB?
• Designed for devices with similar power constraints but too narrow spectrum is assigned for
data transmission

4. DVB-H Standard
EN 302 304
DVB-H
System
Specification
TS 101
191
SFN
Megaframe
EN 301 192
Data
Broadcasting
• Time slicing
• MPE-FEC
EN 300 744 DVB-T
Annex F, G
• TPS -4k
• Interleavers -5Mz
EN 300 468
DVB SI
DVB – H
Implementation
Guidelines
ETR XXX XXX

5. What is DVB-H?
• Transmission of Data mainly as IP frames (Internet Protocol)
• New video compression scheme (H.264) with lower bitrate and for
smaller screen size
• Approx. 390 Kbit/s per stream (MPEG2 3-4 Mbit/s)
• More suitable for broadcasting to mobile environment

6. Features of DVB-H
• Time Slicing : allow Power Saving and Frequency Handover
• MPE-FEC: an additional protection at the DATA link layer level
• New Signaling scheme : modified TPS bits and more MPEG tables (INT)
• 4K: a new trade-off between transmission cell size and mobile reception
capabilities, flexibility for network planning
• In-depth interleaver a free feature to improve performance

7. Time Slicing
• Burst Transmission
• Significant Power Saving (up to 90%)
• Seamless Handover
• Longer initial tuning delay
• 2Mbit buffer
DVB-T DVB-H
Off time
Bust Size 2Mbit

8. MPE FEC
• MPE-FEC (Forward Error Correction)
• Reed-Solomon coding on IP datagrams => higher error resistance
• Virtual interleaving, FEC placed in separate sections
• (receiver is free to ignore MPE-FEC)
RS Codewords

9. Transmission Parameters
• All the DVB-T options including the new ones are available:
• 8k, 4k or 2k
• Modulations QPSK, 16QAM, 64 QAM
• Code rates 1/2- 7/8, recommended 1/2 or 2/3
• Native or in-depth interleavers in 2k and 4k

10. DVB-H Codec