Trends in digital broadcasting
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1 Trends in digital broadcasting 1
2 Overview Trends in the Digital Radio ITU Regulation Trends in the Digital Television ITU Regulation 2
3 Band Frequency bands for Broadcasting Frequency services ( HF) BC/BT Region Geo. zone Plan (khz/mhz) LF khz BC R1 GE75 MF khz BC R1 and R3 GE BC R2 RJ BC R2 RJ88 VHF /UHF MHz MHz (170 MRC) , BC, BT BT BT BC BT BC, BT BT BT EBA ABA EBA R1* MRC R1-MNG+IRN See RR R1-MNG+IRN ST61 GE89 ST61 GE84 ST61 GE06 GE89 GE06 * and part of R3 3
4 New possibilities to the viewers: Why digital? for Regulators : Efficient use of Spectrum Additional number of programs Additional reception modes Improved quality of image and sound Additional type of services: interactivity, Electronic Program Guides, etc. Fair competition: To develop a terrestrial platform competitive with the other platforms Efficiency of spectrum (1 frequency for multiple programs) Possibility to free a part of the Band for other usage TV operators/content providers: Good for the environment Significant decrease in transmission costs comparing to analogue: Power costs: DTT requires less energy to ensure the same coverage as for the analogue, Investment and transmission cost: One transmitter to broadcast multiple channels/programs. Development of new services without spectrum constraints. Offering of new innovative services (mobile TV, data, games, interactivity, VoD,...).
5 Digital Radio..
6 ITU recommendations Recommendation ITU-R BS : System for digital sound broadcasting in the broadcasting bands below 30 MHz. Recommendation ITU-R BS : Systems for terrestrial digital sound broadcasting to vehicular, portable and fixed receivers in the frequency range MHz. Recommendation ITU-R BS.774-3: Service requirements for digital sound broadcasting to vehicular, portable and fixed receivers using terrestrial transmitters in the VHF/UHF bands. 6
7 Digital Sound standards See ITU-R Recommendation BS DRM Digital Radio Mondiale ISDB-TSB Integrated Services Digital Broadcasting- Terrestrial Sound Broadcasting T-DAB/T-DMB Terrestrial Digital Audio Broadcasting/ Multimedia Broadcasting HD Radio proprietary standard from ibiquity IBOC In-band onchannel DRM30: Designed to operate on 150kHz to30 MHz DRM+: in VHF Bands I, II, and III Allows to broadcast up to 4 different services in an ITU channel (9 or 10 khz). consists of one or three OFDMsegments; The bandwidth of the system is approximately 500 khz or 1.5 MHz DAB/DAB+: operates at any frequency up to MHz DMB: Suitable for mobile radio and TV as it supports MPEG 4 AVC. (designed to be carried on a DAB subchannel. The only standard approved by the FCC for AM/FM in the US. 200 khz-wide channels. uses a codec based upon the MPEG-4 HE-AAC standard. < 3MHz Described in Annex 4; 7
8 DRM transmission modes Mode QAM Bandwidth (khz) Typical uses A 16, , 5, 9, 10, 18, 20 LF & MF ground-wave, 26MHz band line-of-sight B 16, , 5, 9, 10, 18, 20 HF & MF transmission on sky-wave C 16, 64 10, 20 Difficult sky-wave channels on HF D 16, 64 10, 20 NVIS sky-wave (highest Doppler & delay spread) E 4, VHF transmissions in the bands above 30 MHz DRM30 DRM+ Mode A is designed to deliver the highest bit rate possible within the context of ground-wave or line-of-site coverage. Mode B will generally be the first choice for sky-wave services. Where propagation conditions are more severe, such as for long paths with multiple hops, or near vertical incidence, where several very strong reflections may occur, Mode C or Mode D may need to be employed. Finally, Mode E is used for the VHF frequency bands from 30 MHz up to Band III (DRM+). Source: 8
9 DAB+ transmission modes Mode 1 VHF Mode 2 UHF Mode 3 L- Band bandwidth DAB+ frequency block MHz MHz MHz number of carriers in frequency block carrier spacing 1 khz 2 khz 4 khz data rate (incl. overhead) 2.4 Mbit/s 2.4 Mbit/s 2.4 Mbit/s transmitter distance in SFN 75 km 48 km 18.8 km Source: LSTelcom 9
10 Introduction and implementation of terrestrial DSB in planned Bands Introduction of digital sound broadcasting in various relevant Regional Agreements: RJ81, GE-75; ST-61; GE-84; GE-89; GE-06 Introduction of digital sound broadcasting in nonplanned bands but regulated by a specific article of the RR (HFBC) 10
11 Introduction of digital sound- RJ81 Region 2 Frequency bands: khz The RJ81 Agreement do not provide for the possibility of introducing digital modulation in the bands concerned. Question ITU-R 120/6 (2006) Digital sound broadcasting in Region 2 has been adopted by Study Group 6E.
12 Introduction of Digital transmission GE75 Regions 1 & 3 Governs LF/MF Sound Broadcasting bands: LF khz MF khz Radio Regions 1 and 3 Rule of Procedure (RRB) Transmission systems DRM A2 and B2 Radiation reduced by at least 7 db in all directions w.r.t analogue assignment Temporary measure until the decision from a competent conference
13 Introduction of Digital transmission ST61 Regions 1 & 3 Digital modulation systems can be used under RoP Part A2/ST61 paragraph 5 same coordination distances as analogue systems No submissions or notifications to date 13
14 Introduction of Digital transmission GE84 Regions 1 & MHz FM sound broadcasting band 100 khz channeling arrangement Digital modulation possible under: 3.1 of Chapter 3 of Annex 2 to GE84 Use of systems with different characteristics (e.g. digital modulation) Does not cause greater interference Nor require higher protection than reference system in the Plan Problematic to introduce new digital assignments in congested bands
15 Digital under GE89 Digital modulation systems can be used under provision 2.3 See Rule of Procedure Part A6/GE89 for a modification under Article 4 of the agreement 15
16 GE06 Bands for Sound broadcasting MHz (Band III) 7 and 8 MHz TV channelization arrangements khz T-DAB blocks Adopted T-DAB as planned standard for digital sound broadcasting Implementation of alternative standards under envelope of Plan entries : DVB-T 1 4 T-DAB blocks (Prov e + RoP A10) T-DAB Other candidate digital sound broadcasting transmission systems (Prov ) 16
17 Introduction of digital HFBC Other modulation techniques recommended by ITU-R shall be permitted in place of double-sideband or single-sideband emissions, provided that the level of interference caused to existing emissions is not increased. Res. 517 (Rev.WRC-03) Introduction of digital modulation schemes khz Entry into force July 2003
18 Digital Television..
19 Handbook: ITU Documents on DSO-ASO Guidelines for the transition from analogue to digital broadcasting DRAFT TEXT OF HANDBOOK: DIGITAL TERRESTRIAL TELEVISION (DTTB) IMPLEMENTATION- VOLUME 1: NETWORKING ASPECTS OF DIGITAL TV BROADCASTING- SG6 of ITU-R Reports: R-REP-BT MSW-E-Guidelines for DTT implementation R-REP-BT MSW-E-Mobile DTT R-REP-BT MSW-E-TRANSITION FROM ANALOGUE TO DIGITAL Recommendations Recommendation BT.1125 Basic objectives for the planning and implementation of digital terrestrial television broadcasting systems Recommendation BT.1306 Error correction, data framing, modulation and emission methods for digital terrestrial television broadcasting Recommendation BT.1368 Planning criteria for digital terrestrial television services in the VHF/UHF bands
20 DTT System standards-fx ASTC DMB-T/H (ChinaDTV) DVB ISDB-T Advanced Television Systems Committee (System A) Framing structure, channel coding and modulation for DTTB system: designed for fixed and mobile reception. DVB-T : Digital Video Broadcasting Terrestrial (System B) DVB-T2 : Second Generation of DVB-T (at least 30% higher transmission capacity and improved SFN performance Integrated Services Digital Broadcasting Terrestrial- (System C) SBTVD: Adapted by Brazil 2 0
21 Description of Digital Television Broadcasting systems Standard Channels Band Modulation ATSC 6 MHz UHF/VHF 8-VSB DMB-T 8 MHz UHF/VHF OFDM DVB-T 6, 7 and 8 MHz UHF/VHF OFDM DVB-T2 6, 7 and 8 MHz UHF/VHF OFDM ISDB-T 6, 7 and 8 MHz UHF/VHF Segmented OFDM
22 DTT System standards-mo & H ATSC-M/H DMB-T/H (ChinaDTV) DVB-H ISDB-Tmm T-DMB Advanced Television Systems Committee (System A) Framing structure, channel coding and modulation for DTTB system: designed for fixed and mobile reception. Integrated Services Digital Broadcasting Terrestrial- (System C) Terrestrial Digital Multimedia Broadcasting system: enables video services using T-DAB networks for handheld receivers in a mobile environment 2 2
23 Mobile digital broadcasting Standard or Spec. Modulation Transport stream RF channel (MUX) size (MHz) Int. Broadcast bands Regional national origin DVB-H ISDB-Tmm T-DMB QPSK or 16-QAM COFDM IP/MPE-FEC/ MPEG2 TS 8 IV and V QPSK or 16-QAM COFDM MPEG2 TS IV and V DQPSK COFDM MPEG2 TS 1.75 ATSC-M/H 8-VSB III and 1.5 GHz UHF/VHF Region 1 (Europe) Region 3 (Japan) Region 3 (Rep. of Korea) Region 2 T2-lite QPSK H IV and V Region 1 (Europe)
24 DTT Compression coding MPEG2/H.262: 4-6 programs SDTV in 1 channel 8Mhz MPEG4 AVC/H.264: 6-10 SDTV programs in 1 channel, 4-6 HDTV programs in 1 channel H.265 High Efficiency Video Coding (HEVC): double the data compression ratio compared to H.264, can support 8K UHD
25 Deployed DTT Standards 25
26
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