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Trends in Digital Broadcasting

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Trends in Digital Broadcasting Trends in digital broadcasting Radiocommunication Bureau Mrs. Ilham Ghazi Overview Trends in the Digital Radio • ITU Regulation Trends in the Digital Television • ITU Regulation 2 Frequency bands for Broadcasting services (≠ HF) Band Frequency BC/BT Region Geo. zone Plan (kHz/MHz) LF 148.5-283.5 kHz BC R1 GE75 MF 526.5-1 606.5 kHz BC R1 and R3 GE75 525-1 605 BC R2 RJ81 1 605-1 705 BC R2 RJ88 VHF 47-68 MHz BC, BT EBA ST61 /UHF 47-68 BT ABA GE89 87.5-100 BT EBA ST61 87.5-108 BC R1* GE84 162-170 MHz BT MRC ST61 (170 MRC)174-230 BC , BT R1-MNG+IRN GE06 230-238, 246-254 BT See RR 5.252 GE89 470-862 BT R1-MNG+IRN GE06 * and part of R3 Why digital? Efficient use of New possibilities to the viewers: for Regulators : Spectrum • Additional number of programs • Fair competition: To develop a • Additional reception modes terrestrial platform competitive with • Improved quality of image and the other platforms sound • Efficiency of spectrum (1 frequency • Additional type of services: for multiple programs) interactivity, Electronic Program • Possibility to free a part of the Band Guides, etc. 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,...). Digital Radio .. ITU-R recommendations Recommendation ITU-R BS.1514-2: System for digital sound broadcasting in the broadcasting bands below 30 MHz. Recommendation ITU-R BS.1114-7: Systems for terrestrial digital sound broadcasting to vehicular, portable and fixed receivers in the frequency range 30-3 000 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. Digital Sound standards (See ITU-R Recommendation BS. 1114-7) ISDB-TSB – T-DAB/T-DMB Integrated Terrestrial HD Radio™ DRM Services Digital IBOC Digital Audio Broadcasting- proprietary Digital Radio Broadcasting/ In-band on- Terrestrial standard from Mondiale Multimedia channel Sound iBiquity Broadcasting Broadcasting • DRM30: • consists of • DAB/DAB+: • The only Designed to one or three operates at standard • < 3MHz operate on OFDM- any frequency approved by • Described in 150kHz to30 segments; up to 3 000 the FCC for Annex 4; MHz • The MHz AM/FM in the • DRM+: in bandwidth of • DMB: Suitable US. VHF Bands I, the system is for mobile • 200 kHz-wide II, and III approximately radio and TV channels. • Allows to 500 kHz or as it supports • uses a codec broadcast up 1.5 MHz MPEG 4 AVC. based upon to 4 different (designed to the MPEG-4 services in an be carried on HE-AAC ITU channel (9 a DAB standard. or 10 kHz). subchannel. DRM transmission modes Mode QAM Bandwidth (kHz) Typical uses A 16, 64 4.5, 5, 9, 10, 18, 20 LF & MF ground-wave, 26MHz band DRM30 line-of-sight B 16, 64 4.5, 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, 16 100 VHF transmissions in the bands above DRM+ 30 MHz 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: www.drm.org DAB+ transmission modes Mode 1 Mode 2 Mode 3 VHF UHF L- Band bandwidth DAB+ frequency 1.536 1.536 1.536 block MHz MHz MHz number of carriers in 1536 768 384 frequency block carrier spacing 1 kHz 2 kHz 4 kHz data rate (incl. overhead) 2.4 2.4 Mbit/s 2.4 Mbit/s Mbit/s transmitter distance in SFN 75 km 48 km 18.8 km Source: LSTelcom Introduction of digital sound broadcasting according to Regional Broadcasting Agreements And HFBC .. Introduction of Digital Sound in Regional Agreements (LF/MF) RJ81 RJ88 GE75 LF:150 –285 kHz; MF – MF: 535 - 1605 1 605 – 1 705 kHz 525 –1 605 kHz; R2 R2 R1 and R3 CCRR/20(6 September 2002), Rule of Procedure Does not provide the the BR concluded that the (RRB): Transmission possibility of formulations in the RJ88 systems DRM A2 and introducing digital Agreement would permit the B2. Radiation reduced modulation in the introduction of digital by at least 7 dB in all bands concerned. modulation DRM A3 or B3 and directions w.r.t also perhaps that of IBOC DSB analogue assignment subject to completion of the Question ITU-R 120/6 studies related to co-channel, Temporary measure (2006) “Digital sound first and second adjacent until the decision from broadcasting in Region channel protection ratios and a competent 2” has been adopted subject to further limitations conference by Study Group 6E. at the band edges in order to be consistent with RR 4.5. Introduction of Digital Sound in Regional Agreements (VHF/UHF) ST61 GE84 GE06 41-68 MHz 87.5 –108 MHz: FM 174 –230 MHz (Band III) R 1&3 1.536 kHz T-DAB R1 & 3 R1&Iran under RoP Part possible under 3.1 of Adopted T-DAB as A2/ST61 paragraph 5 Chapter 3 of Annex 2 planned standard for – same coordination to GE84: not cause digital sound distances as analogue greater interference, broadcasting systems Nor require higher Implementation of Problematic to alternative standards No submission or introduce new digital under envelope of Plan entries : DVB-T 1 –4 T- notification to date assignments in DAB blocks (Prov. 5.1.2 e + congested bands RoP A10) • T-DAB Other digital systems (Prov. 5.1.3) Introduction of digital HFBC 12.7 § 6 of RR: Other modulation techniques Res. 517 (Rev.WRC-03) recommended by ITU-R shall be permitted in Introduction of digital place of double- modulation schemes 5 sideband or single- 900 – 26 100 kHz sideband emissions, provided that the level of interference caused to existing emissions is Entry into force July not increased. 2003 Digital Television .. ITU-R Documents on DTT Guidelines for the transition from analogue to digital broadcasting Handbook • DTTB IMPLEMENTATION- VOLUME 1: NETWORKING ASPECTS OF DIGITAL TV BROADCASTING- SG6 OF ITU-R BT.2035: Guidelines for DTT implementation • BT.2049: Mobile DTT Reports • BT.2137: Coverage prediction methods and planning software for digital terrestrial television broadcasting (DTTB) networks • BT.2140: TRANSITION FROM ANALOGUE TO DIGITAL BT.1125: Basic objectives for the planning and implementation of digital terrestrial television broadcasting systems Recomme • BT.1306: Error correction, data framing, modulation and ndations emission methods for digital terrestrial television broadcasting • BT.1368: Planning criteria for digital terrestrial television services in the VHF/UHF bands DTT System standards-FX DMB-T/H ASTC DVB ISDB-T (ChinaDTV) • Advanced • Framing • DVB-T : Digital • Integrated Services Television structure, Video Broadcasting Digital Systems channel coding Terrestrial (System Broadcasting Committee and modulation B) Terrestrial- (System C) (System A) for DTTB system: • DVB-T2 : Second Generation of • SBTVD: Adapted by designed for DVB-T (at least Brazil fixed and mobile 30% higher reception. transmission capacity and improved SFN performance Adopted DTT standards DVB-T DVB-T2 ATSC ISDB-T DTMB Source: http://www.itu.int/en/ITU-D/Spectrum-Broadcasting/Pages/DSO/dashboard.aspx 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 DTT System standards-MO & H DMB-T/H ATSC-M/H DVB-H ISDB-Tmm T-DMB (ChinaDTV) • Advanced • Framing • Digital Video • Integrated • Terrestrial Television structure, Broadcasting Services Digital Systems channel Terrestrial – Digital Multimedia Committee coding and Handheld Broadcasting Broadcasting Terrestrial- system: (System A) modulation (System C) enables video for DTTB services using system: T-DAB designed for networks for fixed and handheld mobile receivers in a reception. mobile environment Mobile digital broadcasting RF channel Int. Regional Standard Transport Modulation (MUX) size Broadcast national or Spec. stream (MHz) bands origin DVB-H QPSK or IP/MPE- Region 1 16-QAM COFDM FEC/ 8 IV and V (Europe) MPEG2 TS ISDB-Tmm QPSK or Region 3 MPEG2 TS 0.433 IV and V 16-QAM COFDM (Japan) T-DMB DQPSK COFDM III and Region 3 MPEG2 TS 1.75 1.5 GHz (Korea) ATSC-M/H 8-VSB 1.834 UHF/VHF Region 2 T2-lite QPSK Region 1 H.264 8 IV and V (Europe) Introduction of Digital TV in Regional Agreements (VHF/UHF) ST61 GE89 GE06 41-68 MHz (Sound and TV) 41-68 MHz 174-230/470-896 MHz 87.5-100 MHz (TV) R1 & 3 R1&Iran 162-174 MHz (TV) Digital Modulation : Digital modulation RoP Part A2 Adopted DVB-T as systems can be used planned standard for DTT under provision 2.3 under Art 4 or Art 5, the relevant coordination distances of the Agreement shall be equally applied to analogue and digital systems.
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