dvb h and its introduction and how to use it.pptx
- 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