SIST EN 302 755 V1.4.1:2016

Digital Video Broadcasting (DVB);Frame structure channel coding and modulation for a second generation digital terrestrial television broadcasting system (DVB-T2)

The present document describes a second generation baseline transmission system for digital terrestrial television
broadcasting. It specifies the channel coding/modulation system intended for digital television services and generic data
streams.
The scope is as follows:
• it gives a general description of the Baseline System for digital terrestrial TV;
• it specifies the digitally modulated signal in order to allow compatibility between pieces of equipment
developed by different manufacturers. This is achieved by describing in detail the signal processing at the
modulator side, while the processing at the receiver side is left open to different implementation solutions.
However, it is necessary in this text to refer to certain aspects of reception.
Versions 1.1.1 and 1.2.1 of the present document [i.7] and [i.8] defined a single profile which incorporates time-slicing
but not time-frequency-slicing (TFS). Features which would allow a possible future implementation of TFS (for
receivers with two tuners/front-ends) can be found in annex E. It is not intended that a receiver with a single tuner
should support TFS.
Version 1.3.1 of the present document [i.9] added a T2-Lite profile. This profile is intended to allow simpler receiver
implementations for very low capacity applications such as mobile broadcasting, although it may also be received by
conventional stationary receivers. The details of this T2-Lite profile are described in annex I. Version 1.3.1 of the
present document [i.9] also introduces a name, which is 'T2-base profile', for the previous single profile.
Version 1.4.1 (the present document) made a number of changes, but all of these are clarifications of particular points,
changes in non-normative recommendations, and corrections to the wording; no new technical features have been added
and no changes have been made to existing features.

Digitalna videoradiodifuzija (DVB) - Struktura okvirov, kodiranje kanalov in modulacija za drugo generacijo sistema digitalne prizemne televizijske radiodifuzije (DVB-T2)

Ta dokument opisuje drugo generacijo osnovnega prenosnega sistema za digitalno prizemno televizijsko radiodifuzijo. Določa sistem za kodiranje/modulacijo kanalov, namenjen za storitve digitalne televizije in splošnih podatkovnih tokov.
Obseg je naslednji:
• podaja splošen opis osnovnega sistema za digitalno prizemno televizijo;
• določa digitalno moduliran signal, s čimer omogoči združljivost med deli opreme
različnih proizvajalcev. To se doseže s podrobnim opisom obdelave signala na strani modulatorja, medtem ko je obdelava na strani sprejemnika mogoča z različnimi rešitvami.
Vendar je treba v okviru tega besedila nasloviti tudi določene vidike sprejemanja.
Različici 1.1.1 in 1.2.1 tega dokumenta [i.7] in [i.8] opredeljujeta en sam profil, ki vključuje časovno segmentacijo, ne pa tudi časovno-frekvenčne segmentacije (TFS). Značilnosti, ki bi omogočale morebitno prihodnjo uvedbo časovno-frekvenčne segmentacije (TFS) (za sprejemnike z dvema uglaševalnikoma/demodulatorjema), so navedene v dodatku E. Sprejemnik z enim samim uglaševalnikom naj ne bi bil namenjen podpori časovno-frekvenčne segmentacije (TFS).
Različica 1.3.1 tega dokumenta [i.9] dodatno vključuje profil T2-Lite. Ta profil omogoča preprostejše uvedbe sprejemnika za uporabe z zelo nizkimi zmogljivostmi, kot je mobilna radiodifuzija, čeprav ga lahko sprejemajo tudi običajni stacionarni sprejemniki. Podrobnosti tega profila T2-Lite so opisane v dodatku I. Različica 1.3.1 tega dokumenta [i.9] uvaja tudi naziv, tj. »profil T2-base«, in sicer za prejšnji posamezni profil.
Različica 1.4.1 (ta dokument) je uvedla številne spremembe, vendar so te spremembe le pojasnila določenih točk, spremembe v priporočilih, ki niso normativna, ter popravki besedila; nobene nove tehnične funkcije niso bile dodane in nobene obstoječe funkcije niso bile spremenjene.

General Information

• Status: Published
• Publication Date: 05-Jan-2016
• ICS: 33.170 - Television and radio broadcasting
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-Nov-2015
• Due Date: 09-Jan-2016
• Completion Date: 06-Jan-2016
• Ref Project: ETSI EN 302 755 V1.4.1 (2015-07) - Digital Video Broadcasting (DVB); Frame structure channel coding and modulation for a second generation digital terrestrial television broadcasting system (DVB-T2)

Overview

SIST EN 302 755 V1.4.1:2016 (equivalent to ETSI EN 302 755 V1.4.1) defines the DVB-T2 baseline transmission system for second‑generation digital terrestrial television. The standard specifies the transmitter‑side signal processing needed to ensure interoperability between equipment from different manufacturers. It covers the frame structure, channel coding and modulation schemes used to deliver digital TV services and generic data streams. Version 1.4.1 clarifies wording and non‑normative guidance only; it introduces no new technical features.

Key topics and technical requirements

The document addresses the full signal creation chain for DVB‑T2, with major technical topics including:

• System architecture and target performance - overview of the DVB‑T2 baseline system and performance objectives.
• Input and stream adaptation - mode adaptation, input formats, synchronization, null‑packet deletion, CRC and baseband header insertion.
• Bit‑interleaved coding and modulation (BICM) - layered coding approach with outer BCH and inner LDPC error correction, bit interleaving and mapping to modulation constellations (including 16‑QAM, 64‑QAM, 256‑QAM).
• Interleaving and time processing - cell interleaver, time interleaver, mapping of interleaving frames to T2‑frames and handling of short/normal FEC frames.
• L1 signalling - generation, coding and modulation of the Layer‑1 signaling (P1, L1‑pre, L1‑post) that informs receivers about frame configuration and PLPs.
• Frame and super‑frame structure - T2‑frame duration, capacity, mapping of PLPs (Physical Layer Pipes) and L1 data into P2 symbols.
• Profiles and compatibility - description of the T2‑base profile and T2‑Lite profile (for simpler, low‑capacity/mobile reception), and optional support for time‑frequency slicing (TFS) for dual‑tuner receivers (annex E).

Practical applications and who uses this standard

SIST EN 302 755 is primarily used by:

• Broadcasters and network operators planning or operating DVB‑T2 terrestrial services (HD/UHD, mobile TV, datacasting).
• Transmitter and modem manufacturers implementing compliant modulators and encoders to ensure cross‑vendor interoperability.
• Receiver and chipset designers who need to support the signalling and PLP structures (note: the standard defines transmitter processing; receiver implementations may vary).
• Test laboratories and certification bodies validating DVB‑T2 equipment conformance.
• Regulators and system planners defining national frequency and service profiles.

Keywords: DVB‑T2, digital terrestrial television, channel coding, modulation, LDPC, BCH, frame structure, PLP, L1 signalling, T2‑Lite.

Related standards

• ETSI EN 302 755 series (earlier revisions referenced in the document)
• Associated DVB system documents and ETSI broadcast standards (for conformance and implementation guidance).

Standards Content (Sample)

Draft ETSI EN 302 755 V1.4.1 (2015-02)

EUROPEAN STANDARD
Digital Video Broadcasting (DVB);
Frame structure channel coding and modulation
for a second generation digital terrestrial
television broadcasting system (DVB-T2)

2 Draft ETSI EN 302 755 V1.4.1 (2015-02)

Reference
REN/JTC-DVB-349
Keywords
audio, broadcasting, data, digital, DVB, MPEG,
terrestrial, TV, video
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
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ETSI
3 Draft ETSI EN 302 755 V1.4.1 (2015-02)
Contents
Intellectual Property Rights . 8
Foreword . 8
Modal verbs terminology . 9
1 Scope . 10
2 References . 10
2.1 Normative references . 10
2.2 Informative references . 11
3 Definitions, symbols and abbreviations . 11
3.1 Definitions . 11
3.2 Symbols . 14
3.3 Abbreviations . 18
4 DVB-T2 System architecture . 20
4.1 System overview . 20
4.2 System architecture . 22
4.3 Target performance . 24
5 Input processing . 25
5.1 Mode adaptation . 25
5.1.0 Overview . 25
5.1.1 Input Formats . 25
5.1.2 Input Interface . 26
5.1.3 Input Stream Synchronization. 26
5.1.4 Compensating Delay for Transport Streams . 27
5.1.5 Null Packet Deletion (optional, for TS only, NM and HEM) . 27
5.1.6 CRC-8 encoding (for GFPS and TS, NM only) . 28
5.1.7 Baseband Header (BBHEADER) insertion . 28
5.1.8 Mode adaptation sub-system output stream formats . 29
5.2 Stream adaptation . 32
5.2.0 Overview . 32
5.2.1 Scheduler . 33
5.2.2 Padding . 33
5.2.3 Use of the padding field for in-band signalling . 33
5.2.3.0 Types and format . 33
5.2.3.1 In-band type A . 34
5.2.3.2 In-band type B . 36
5.2.4 BB scrambling . 37
6 Bit-interleaved coding and modulation . 38
6.1 FEC encoding . 38
6.1.0 Overview . 38
6.1.1 Outer encoding (BCH) . 39
6.1.2 Inner encoding (LDPC) . 41
6.1.2.0 Overview . 41
6.1.2.1 Inner coding for normal FECFRAME. 41
6.1.2.2 Inner coding for short FECFRAME . 42
6.1.3 Bit Interleaver (for 16-QAM, 64-QAM and 256-QAM). 43
6.2 Mapping bits onto constellations . 44
6.2.0 Overview . 44
6.2.1 Bit to cell word de-multiplexer . 45
6.2.2 Cell word mapping into I/Q constellations . 48
6.3 Constellation Rotation and Cyclic Q Delay . 53
6.4 Cell Interleaver . 53
6.5 Time Interleaver . 55
6.5.0 Overview . 55
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4 Draft ETSI EN 302 755 V1.4.1 (2015-02)
6.5.1 Mapping of Interleaving Frames onto one or more T2-frames . 57
6.5.2 Division of Interleaving frames into Time Interleaving Blocks. 57
6.5.3 Interleaving of each TI-block. 58
6.5.4 Using the three Time Interleaving options with sub-slicing . 60
6.5.5 PLPs for which Time Interleaving is not used . 62
7 Generation, coding and modulation of Layer 1 signalling . 62
7.1 Introduction . 62
7.2 L1 signalling data . 63
7.2.0 Overview . 63
7.2.1 P1 Signalling data . 63
7.2.2 L1-Pre Signalling data . 65
7.2.3 L1-post signalling data . 69
7.2.3.0 Overview . 69
7.2.3.1 Configurable L1-post signalling . 70
7.2.3.2 Dynamic L1-post signalling . 75
7.2.3.3 Repetition of L1-post dynamic data . 77
7.2.3.4 L1-post extension field . 77
7.2.3.4.0 Overview . 77
7.2.3.4.1 Padding L1-post extension blocks . 78
7.2.3.5 CRC for the L1-post signalling . 78
7.2.3.6 L1 padding . 78
7.2.3.7 L1 bias balancing bits. 78
7.3 Modulation and error correction coding of the L1 data . 79
7.3.1 Overview . 79
7.3.1.1 Error correction coding and modulation of the L1-pre signalling . 79
7.3.1.2 Error correction coding and modulation of the L1-post signalling . 79
7.3.2 Scrambling and FEC Encoding . 81
7.3.2.1 Scrambling of L1-post information bits . 81
7.3.2.2 Zero padding of BCH information bits . 82
7.3.2.3 BCH encoding . 83
7.3.2.4 LDPC encoding . 84
7.3.2.5 Puncturing of LDPC parity bits . 84
7.3.2.6 Removal of zero padding bits. 85
7.3.2.7 Bit interleaving for L1-post signalling . 85
7.3.3 Mapping bits onto constellations . 86
7.3.3.0 Overview . 86
7.3.3.1 Demultiplexing of L1-post signalling . 86
7.3.3.2 Mapping into I/Q constellations . 86
7.3.3.3 Modification of L1 signalling constellations by L1-ACE algorithm . 86
8 Frame Builder . 88
8.0 Overview . 88
8.1 Frame structure . 88
8.2 Super-frame . 89
8.3 T2-Frame . 90
8.3.0 Overview . 90
8.3.1 Duration of the T2-Frame . 90
8.3.2 Capacity and structure of the T2-frame . 91
8.3.3 Signalling of the T2-frame structure and PLPs . 94
8.3.4 Overview of the T2-frame mapping . 94
8.3.5 Mapping of L1 signalling information to P2 symbol(s) . 95
8.3.6 Mapping the PLPs . 97
8.3.6.0 Overview . 97
8.3.6.1 Allocating the cells of the Interleaving Frames to the T2-Frames . 97
8.3.6.2 Addressing of OFDM cells . 98
8.3.6.3 Mapping the PLPs to the data cell addresses. 99
8.3.6.3.0 Overview . 99
8.3.6.3.1 Insertion of bias balancing cells . 99
8.3.6.3.2 Mapping the Common and Type 1 PLPs . 101
8.3.6.3.3 Mapping the Type 2 PLPs . 101
8.3.7 Auxiliary stream insertion . 102
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5 Draft ETSI EN 302 755 V1.4.1 (2015-02)
8.3.8 Dummy cell insertion. 103
8.3.9 Insertion of unmodulated cells in the Frame Closing Symbol . 103
8.4 Future Extension Frames (FEF) . 103
8.5 Frequency interleaver . 104
9 OFDM Generation . 109
9.0 Overview . 109
9.1 MISO Processing . 109
9.2 Pilot insertion . 110
9.2.1 Introduction. 110
9.2.2 Definition of the reference sequence . 110
9.2.2.0 Overview . 110
9.2.2.1 Symbol level . 111
9.2.2.2 Frame level . 112
9.2.3 Scattered pilot insertion . 112
9.2.3.0 Overview . 112
9.2.3.1 Locations of the scattered pilots . 112
9.2.3.2 Amplitudes of the scattered pilots . 114
9.2.3.3 Modulation of the scattered pilots . 114
9.2.4 Continual pilot insertion . 114
9.2.4.0 Overview . 114
9.2.4.1 Locations of the continual pilots . 114
9.2.4.2 Locations of additional continual pilots in extended carrier mode . 115
9.2.4.3 Amplitudes of the Continual Pilots . 115
9.2.4.4 Modulation of the Continual Pilots . 115
9.2.5 Edge pilot insertion . 115
9.2.6 P2 pilot insertion . 116
9.2.6.1 Locations of the P2 pilots . 116
9.2.6.2 Amplitudes of the P2 pilots . 116
9.2.6.3 Modulation of the P2 pilots . 116
9.2.7 Insertion of frame closing pilots . 116
9.2.7.0 Overview . 116
9.2.7.1 Locations of the frame closing pilots . 117
9.2.7.2 Amplitudes of the frame closing pilots . 117
9.2.7.3 Modulation of the frame closing pilots . 117
9.2.8 Modification of the pilots for MISO . 117
9.3 Dummy tone reservation . 119
9.4 Mapping of data cells to OFDM carriers . 119
9.5 IFFT - OFDM Modulation . 119
9.6 PAPR Reduction . 121
9.6.0 Overview . 121
9.6.1 Active Constellation Extension. 121
9.6.2 PAPR reduction using tone reservation . 123
9.6.2.0 Overview . 123
9.6.2.1 Algorithm of PAPR reduction using tone reservation . 124
9.7 Guard interval insertion . 126
9.8 P1 Symbol insertion . 126
9.8.1 P1 Symbol overview . 126
9.8.2 P1 Symbol description . 126
9.8.2.0 Overview . 126
9.8.2.1 Carrier Distribution in P1 symbol . 128
9.8.2.2 Modulation of the Active Carriers in P1 . 128
9.8.2.3 Boosting of the Active Carriers . 130
9.8.2.4 Generation of the time domain P1 signal . 131
9.8.2.4.1 Generation of the main part of the P1 signal . 131
9.8.2.4.2 Frequency Shifted repetition in Guard Intervals . 131
10 Spectrum characteristics . 131
Annex A (normative): Addresses of parity bit accumulators for N = 64 800 . 134
ldpc
Annex B (normative): Addresses of parity bit accumulators for N = 16 200 . 141
ldpc
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6 Draft ETSI EN 302 755 V1.4.1 (2015-02)
Annex C (normative): Additional Mode Adaptation tools . 144
C.1 Input stream synchronizer . 144
C.1.0 ISSY definition and signalling . 144
C.1.1 Receiver Buffer Model . 146
C.1.2 Requirements of input signal . 149
Annex D (normative): Splitting of input MPEG-2 TSs into the data PLPs and common PLP
of a group of PLPs . 151
D.1 Overview . 151
D.2 Splitting of input TS into a TSPS stream and a TSPSC stream . 152
D.2.1 General . 152
D.2.2 Co-timed TS packets that are identical on all input TSs of the group before the split . 152
D.2.3 Co-timed TS packets carrying Service Description Table (SDT) and not having the characteristic of
category (1) . 153
D.2.4 Co-timed TS packets carrying Event Information Table (EIT) and not having the characteristic of
category (1) . 155
D.2.4.0 Overview . 155
D.2.4.1 Required operations . 155
D.2.4.2 Conditions . 155
D.3 Receiver Implementation Considerations. 157
Annex E (informative): T2-frame structure for Time-Frequency Slicing . 158
E.1 General . 158
E.2 T2-frame structure . 159
E.2.1 Duration and capacity of the T2-frame. 159
E.2.2 Overall structure of the T2-frame . 159
E.2.3 Structure of the Type-2 part of the T2-frame . 160
E.2.4 Restrictions on frame structure to allow tuner switching time . 161
E.2.5 Signalling of the dynamic parameters in a TFS configuration . 162
E.2.6 Indexing of RF channels . 162
E.2.7 Mapping the PLPs . 163
E.2.7.0 Overview . 163
E.2.7.1 Mapping the Common and Type 1 PLPs . 163
E.2.7.2 Mapping the Type 2 PLPs . 163
E.2.7.2.0 Overview . 163
E.2.7.2.1 Allocating the cells of the Interleaving Frame to the T2-Frames . 164
E.2.7.2.2 Size of the sub-slices . 165
E.2.7.2.3 Allocation of cell addresses to the sub-slices on RF . 165
start
E.2.7.2.4 Allocation of cell addresses to the sub-slices on the other RF channels . 166
E.2.7.2.5 Mapping the PLP cells to the allocated cell addresses . 167
E.2.8 Auxiliary streams and dummy cells . 167
Annex F (normative): Calculation of the CRC word . 168
Annex G (normative): Locations of the continual pilots . 169
Annex H (normative): Reserved carrier indices for PAPR reduction . 173
Annex I (normative): T2-Lite . 175
I.1 Overview . 175
I.2 In-band signalling . 175
I.3 FEC encoding for T2-Lite . 175
I.4 Bit to cell word de-multiplexer . 176
I.5 Modulation limitations for T2-Lite . 177
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7 Draft ETSI EN 302 755 V1.4.1 (2015-02)
I.6 T2-Lite L1-signalling . 177
I.7 T2-Lite mode limitations . 178
I.7.0 Overview . 178
I.7.1 FFT size limitations . 178
I.7.2 Pilot pattern limitations . 178
I.7.3 Limitations on mode combinations . 178
I.8 T2-Lite time interleaver memory . 179
I.9 T2-Lite signal structure . 179
I.10 T2-Lite PLP data rate limitations . 179
I.11 T2-Lite receiver buffer model limitations . 180
Annex J (informative): Transport Stream regeneration and clock recovery using ISCR . 181
Annex K (informative): Pilot patterns . 182
Annex L (informative): Allowable sub-slicing values . 190
Annex M (informative): Bibliography . 192
History . 193

ETSI
8 Draft ETSI EN 302 755 V1.4.1 (2015-02)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This draft European Standard (EN) has been produced by Joint Technical Committee (JTC) Broadcast of the European
Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique (CENELEC) and the European
Telecommunications Standards Institute (ETSI), and is now submitted for the combined Public Enquiry and Vote phase
of the ETSI standards EN Approval Procedure.
NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards in the
specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body
by including in the Memorandum of Understanding also CENELEC, which is responsible for the
standardization of radio and television receivers. The EBU is a professional association of broadcasting
organizations whose work includes the co-ordination of its members' activities in the technical, legal,
programme-making and programme-exchange domains. The EBU has active members in about
60 countries in the European broadcasting area; its headquarters is in Geneva.
European Broadcasting Union
CH-1218 GRAND SACONNEX (Geneva)
Switzerland
Tel: [phone]
Fax: [phone]
The Digital Video Broadcasting Project (DVB) is an industry-led consortium of broadcasters, manufacturers, network
operators, software developers, regulatory bodies, content owners and others committed to designing global standards
for the delivery of digital television and data services. DVB fosters market driven solutions that meet the needs and
economic circumstances of broadcast industry stakeholders and consumers. DVB standards cover all aspects of digital
television from transmission through interfacing, conditional access and interactivity for digital video, audio and data.
The consortium came together in 1993 to provide global standardization, interoperability and future proof
specifications.
Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 6 months after doa

ETSI
9 Draft ETSI EN 302 755 V1.4.1 (2015-02)
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "need not", "will",
"will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms
for the expression of provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
10 Draft ETSI EN 302 755 V1.4.1 (2015-02)
1 Scope
The present document describes a second generation baseline transmission system for digital terrestrial television
broadcasting. It specifies the channel coding/modulation system intended for digital television services and generic data
streams.
The scope is as follows:
• it gives a general description of the Baseline System for digital terrestrial TV;
• it specifies the digitally modulated signal in order to allow compatibility between pieces of equipment
developed by different manufacturers. This is achieved by describing in detail the signal processing at the
modulator side, while the processing at the receiver side is left open to different implementation solutions.
However, it is necessary in this text to refer to certain aspects of reception.
Versions 1.1.1 and 1.2.1 of the present document [i.7] and [i.8] defined a single profile which incorporates time-slicing
but not time-frequency-slicing (TFS). Features which would allow a possible future implementation of TFS (for
receivers with two tuners/front-ends) can be found in annex E. It is not intended that a receiver with a single tuner
should support TFS.
Version 1.3.1 of the present document [i.9] added a T2-Lite profile. This profile is intended to allow simpler receiver
implementations for very low capacity applications such as mobile broadcasting, although it may also be received by
conventional stationary receivers. The details of this T2-Lite profile are described in annex I. Version 1.3.1 of the
present document [i.9] also introduces a name, which is 'T2-base profile', for the previous single profile.
Version 1.4.1 (the present document) made a number of changes, but all of these are clarifications of particular points,
changes in non-normative recommendations, and corrections to the wording; no new technical features have been added
and no changes have been made to existing features.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be
...

ETSI EN 3 302 755 V1.4.1 (201515-07)

EUROPEAN STANDARD
Digital Viideo Bd roadcasting (DVB);
Frame structure ce channel coding and modulalation
for a secondd g eneration digital terrestrialial
television broroadcasting system (DVB-T2)2)

2 ETSI EN 302 755 V1.4.1 (2015-07)

Reference
REN/JTC-DVB-349
Keywords
audio, broadcasting, data, digital, DVB, MPEG,
terrestrial, TV, video
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
http://portal.etsi.org/tb/status/status.asp
If you find errors in the present document, please send your comment to one of the following services:
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Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2015.
© European Broadcasting Union 2015.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
3 ETSI EN 302 755 V1.4.1 (2015-07)
Contents
Intellectual Property Rights . 8
Foreword . 8
Modal verbs terminology . 8
1 Scope . 9
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 9
3 Definitions, symbols and abbreviations . 10
3.1 Definitions . 10
3.2 Symbols . 13
3.3 Abbreviations . 17
4 DVB-T2 System architecture . 19
4.1 System overview . 19
4.2 System architecture . 20
4.3 Target performance . 23
5 Input processing . 23
5.1 Mode adaptation . 23
5.1.0 Overview . 23
5.1.1 Input Formats . 23
5.1.2 Input Interface . 24
5.1.3 Input Stream Synchronization. 25
5.1.4 Compensating Delay for Transport Streams . 25
5.1.5 Null Packet Deletion (optional, for TS only, NM and HEM) . 25
5.1.6 CRC-8 encoding (for GFPS and TS, NM only) . 26
5.1.7 Baseband Header (BBHEADER) insertion . 26
5.1.8 Mode adaptation sub-system output stream formats . 28
5.2 Stream adaptation . 31
5.2.0 Overview . 31
5.2.1 Scheduler . 32
5.2.2 Padding . 32
5.2.3 Use of the padding field for in-band signalling . 32
5.2.3.0 Types and format . 32
5.2.3.1 In-band type A . 33
5.2.3.2 In-band type B . 35
5.2.4 BB scrambling . 36
6 Bit-interleaved coding and modulation . 37
6.1 FEC encoding . 37
6.1.0 Overview . 37
6.1.1 Outer encoding (BCH) . 38
6.1.2 Inner encoding (LDPC) . 40
6.1.2.0 Overview . 40
6.1.2.1 Inner coding for normal FECFRAME. 40
6.1.2.2 Inner coding for short FECFRAME . 41
6.1.3 Bit Interleaver (for 16-QAM, 64-QAM and 256-QAM). 41
6.2 Mapping bits onto constellations . 43
6.2.0 Overview . 43
6.2.1 Bit to cell word de-multiplexer . 43
6.2.2 Cell word mapping into I/Q constellations . 46
6.3 Constellation Rotation and Cyclic Q Delay . 50
6.4 Cell Interleaver . 50
6.5 Time Interleaver . 52
6.5.0 Overview . 52
6.5.1 Mapping of Interleaving Frames onto one or more T2-frames . 54
ETSI
4 ETSI EN 302 755 V1.4.1 (2015-07)
6.5.2 Division of Interleaving frames into Time Interleaving Blocks. 54
6.5.3 Interleaving of each TI-block. 55
6.5.4 Using the three Time Interleaving options with sub-slicing . 57
6.5.5 PLPs for which Time Interleaving is not used . 59
7 Generation, coding and modulation of Layer 1 signalling . 59
7.1 Introduction . 59
7.2 L1 signalling data . 60
7.2.0 Overview . 60
7.2.1 P1 Signalling data . 60
7.2.2 L1-Pre Signalling data . 62
7.2.3 L1-post signalling data . 66
7.2.3.0 Overview . 66
7.2.3.1 Configurable L1-post signalling . 67
7.2.3.2 Dynamic L1-post signalling . 72
7.2.3.3 Repetition of L1-post dynamic data . 73
7.2.3.4 L1-post extension field . 74
7.2.3.4.0 Overview . 74
7.2.3.4.1 Padding L1-post extension blocks . 75
7.2.3.5 CRC for the L1-post signalling . 75
7.2.3.6 L1 padding . 75
7.2.3.7 L1 bias balancing bits. 75
7.3 Modulation and error correction coding of the L1 data . 76
7.3.1 Overview . 76
7.3.1.1 Error correction coding and modulation of the L1-pre signalling . 76
7.3.1.2 Error correction coding and modulation of the L1-post signalling . 76
7.3.2 Scrambling and FEC Encoding . 78
7.3.2.1 Scrambling of L1-post information bits . 78
7.3.2.2 Zero padding of BCH information bits . 78
7.3.2.3 BCH encoding . 80
7.3.2.4 LDPC encoding . 80
7.3.2.5 Puncturing of LDPC parity bits . 80
7.3.2.6 Removal of zero padding bits. 82
7.3.2.7 Bit interleaving for L1-post signalling . 82
7.3.3 Mapping bits onto constellations . 82
7.3.3.0 Overview . 82
7.3.3.1 Demultiplexing of L1-post signalling . 83
7.3.3.2 Mapping into I/Q constellations . 83
7.3.3.3 Modification of L1 signalling constellations by L1-ACE algorithm . 83
8 Frame Builder . 85
8.0 Overview . 85
8.1 Frame structure . 85
8.2 Super-frame . 86
8.3 T2-Frame . 87
8.3.0 Overview . 87
8.3.1 Duration of the T2-Frame . 87
8.3.2 Capacity and structure of the T2-frame . 88
8.3.3 Signalling of the T2-frame structure and PLPs . 90
8.3.4 Overview of the T2-frame mapping . 91
8.3.5 Mapping of L1 signalling information to P2 symbol(s) . 91
8.3.6 Mapping the PLPs . 93
8.3.6.0 Overview . 93
8.3.6.1 Allocating the cells of the Interleaving Frames to the T2-Frames . 93
8.3.6.2 Addressing of OFDM cells . 94
8.3.6.3 Mapping the PLPs to the data cell addresses. 95
8.3.6.3.0 Overview . 95
8.3.6.3.1 Insertion of bias balancing cells . 95
8.3.6.3.2 Mapping the Common and Type 1 PLPs . 97
8.3.6.3.3 Mapping the Type 2 PLPs . 97
8.3.7 Auxiliary stream insertion . 98
8.3.8 Dummy cell insertion. 99
ETSI
5 ETSI EN 302 755 V1.4.1 (2015-07)
8.3.9 Insertion of unmodulated cells in the Frame Closing Symbol . 99
8.4 Future Extension Frames (FEF) . 99
8.5 Frequency interleaver . 100
9 OFDM Generation . 105
9.0 Overview . 105
9.1 MISO Processing . 105
9.2 Pilot insertion . 106
9.2.1 Introduction. 106
9.2.2 Definition of the reference sequence . 106
9.2.2.0 Overview . 106
9.2.2.1 Symbol level . 107
9.2.2.2 Frame level . 108
9.2.3 Scattered pilot insertion . 108
9.2.3.0 Overview . 108
9.2.3.1 Locations of the scattered pilots . 108
9.2.3.2 Amplitudes of the scattered pilots . 110
9.2.3.3 Modulation of the scattered pilots . 110
9.2.4 Continual pilot insertion . 110
9.2.4.0 Overview . 110
9.2.4.1 Locations of the continual pilots . 110
9.2.4.2 Locations of additional continual pilots in extended carrier mode . 111
9.2.4.3 Amplitudes of the Continual Pilots . 111
9.2.4.4 Modulation of the Continual Pilots . 111
9.2.5 Edge pilot insertion . 111
9.2.6 P2 pilot insertion . 111
9.2.6.1 Locations of the P2 pilots . 111
9.2.6.2 Amplitudes of the P2 pilots . 111
9.2.6.3 Modulation of the P2 pilots . 112
9.2.7 Insertion of frame closing pilots . 112
9.2.7.0 Overview . 112
9.2.7.1 Locations of the frame closing pilots . 112
9.2.7.2 Amplitudes of the frame closing pilots . 112
9.2.7.3 Modulation of the frame closing pilots . 113
9.2.8 Modification of the pilots for MISO . 113
9.3 Dummy tone reservation . 114
9.4 Mapping of data cells to OFDM carriers . 114
9.5 IFFT - OFDM Modulation . 115
9.6 PAPR Reduction . 116
9.6.0 Overview . 116
9.6.1 Active Constellation Extension. 117
9.6.2 PAPR reduction using tone reservation . 119
9.6.2.0 Overview . 119
9.6.2.1 Algorithm of PAPR reduction using tone reservation . 119
9.7 Guard interval insertion . 121
9.8 P1 Symbol insertion . 121
9.8.1 P1 Symbol overview . 121
9.8.2 P1 Symbol description . 121
9.8.2.0 Overview . 121
9.8.2.1 Carrier Distribution in P1 symbol . 123
9.8.2.2 Modulation of the Active Carriers in P1 . 123
9.8.2.3 Boosting of the Active Carriers . 125
9.8.2.4 Generation of the time domain P1 signal . 126
9.8.2.4.1 Generation of the main part of the P1 signal . 126
9.8.2.4.2 Frequency Shifted repetition in Guard Intervals . 126
10 Spectrum characteristics . 126
Annex A (normative): Addresses of parity bit accumulators for N = 64 800 . 129
ldpc
Annex B (normative): Addresses of parity bit accumulators for N = 16 200 . 136
ldpc
Annex C (normative): Additional Mode Adaptation tools . 139
ETSI
6 ETSI EN 302 755 V1.4.1 (2015-07)
C.1 Input stream synchronizer . 139
C.1.0 ISSY definition and signalling . 139
C.1.1 Receiver Buffer Model . 141
C.1.2 Requirements of input signal . 144
Annex D (normative): Splitting of input MPEG-2 TSs into the data PLPs and common PLP
of a group of PLPs . 146
D.1 Overview . 146
D.2 Splitting of input TS into a TSPS stream and a TSPSC stream . 147
D.2.1 General . 147
D.2.2 Co-timed TS packets that are identical on all input TSs of the group before the split . 147
D.2.3 Co-timed TS packets carrying Service Description Table (SDT) and not having the characteristic of
category (1) . 148
D.2.4 Co-timed TS packets carrying Event Information Table (EIT) and not having the characteristic of
category (1) . 150
D.2.4.0 Overview . 150
D.2.4.1 Required operations . 150
D.2.4.2 Conditions . 150
D.3 Receiver Implementation Considerations. 152
Annex E (informative): T2-frame structure for Time-Frequency Slicing . 153
E.1 General . 153
E.2 T2-frame structure . 154
E.2.1 Duration and capacity of the T2-frame. 154
E.2.2 Overall structure of the T2-frame . 154
E.2.3 Structure of the Type-2 part of the T2-frame . 155
E.2.4 Restrictions on frame structure to allow tuner switching time . 156
E.2.5 Signalling of the dynamic parameters in a TFS configuration . 157
E.2.6 Indexing of RF channels . 157
E.2.7 Mapping the PLPs . 158
E.2.7.0 Overview . 158
E.2.7.1 Mapping the Common and Type 1 PLPs . 158
E.2.7.2 Mapping the Type 2 PLPs . 158
E.2.7.2.0 Overview . 158
E.2.7.2.1 Allocating the cells of the Interleaving Frame to the T2-Frames . 159
E.2.7.2.2 Size of the sub-slices . 160
E.2.7.2.3 Allocation of cell addresses to the sub-slices on RF . 160
start
E.2.7.2.4 Allocation of cell addresses to the sub-slices on the other RF channels . 161
E.2.7.2.5 Mapping the PLP cells to the allocated cell addresses . 162
E.2.8 Auxiliary streams and dummy cells . 162
Annex F (normative): Calculation of the CRC word . 163
Annex G (normative): Locations of the continual pilots . 164
Annex H (normative): Reserved carrier indices for PAPR reduction . 168
Annex I (normative): T2-Lite . 170
I.1 Overview . 170
I.2 In-band signalling . 170
I.3 FEC encoding for T2-Lite . 170
I.4 Bit to cell word de-multiplexer . 171
I.5 Modulation limitations for T2-Lite . 172
I.6 T2-Lite L1-signalling . 172
ETSI
7 ETSI EN 302 755 V1.4.1 (2015-07)
I.7 T2-Lite mode limitations . 173
I.7.0 Overview . 173
I.7.1 FFT size limitations . 173
I.7.2 Pilot pattern limitations . 173
I.7.3 Limitations on mode combinations . 173
I.8 T2-Lite time interleaver memory . 173
I.9 T2-Lite signal structure . 174
I.10 T2-Lite PLP data rate limitations . 174
I.11 T2-Lite receiver buffer model limitations . 175
Annex J (informative): Transport Stream regeneration and clock recovery using ISCR . 176
Annex K (informative): Pilot patterns . 177
Annex L (informative): Allowable sub-slicing values . 185
Annex M (informative): Bibliography . 187
History . 188

ETSI
8 ETSI EN 302 755 V1.4.1 (2015-07)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This European Standard (EN) has been produced by Joint Technical Committee (JTC) Broadcast of the European
Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique (CENELEC) and the European
Telecommunications Standards Institute (ETSI).
NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards in the
specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body
by including in the Memorandum of Understanding also CENELEC, which is responsible for the
standardization of radio and television receivers. The EBU is a professional association of broadcasting
organizations whose work includes the co-ordination of its members' activities in the technical, legal,
programme-making and programme-exchange domains. The EBU has active members in about
60 countries in the European broadcasting area; its headquarters is in Geneva.
European Broadcasting Union
CH-1218 GRAND SACONNEX (Geneva)
Switzerland
Tel: [phone]
Fax: [phone]
The Digital Video Broadcasting Project (DVB) is an industry-led consortium of broadcasters, manufacturers, network
operators, software developers, regulatory bodies, content owners and others committed to designing global standards
for the delivery of digital television and data services. DVB fosters market driven solutions that meet the needs and
economic circumstances of broadcast industry stakeholders and consumers. DVB standards cover all aspects of digital
television from transmission through interfacing, conditional access and interactivity for digital video, audio and data.
The consortium came together in 1993 to provide global standardization, interoperability and future proof
specifications.
National transposition dates
Date of adoption of this EN: 23 June 2015
Date of latest announcement of this EN (doa): 30 September 2015
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 2016
Date of withdrawal of any conflicting National Standard (dow): 31 March 2016

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
9 ETSI EN 302 755 V1.4.1 (2015-07)
1 Scope
The present document describes a second generation baseline transmission system for digital terrestrial television
broadcasting. It specifies the channel coding/modulation system intended for digital television services and generic data
streams.
The scope is as follows:
• it gives a general description of the Baseline System for digital terrestrial TV;
• it specifies the digitally modulated signal in order to allow compatibility between pieces of equipment
developed by different manufacturers. This is achieved by describing in detail the signal processing at the
modulator side, while the processing at the receiver side is left open to different implementation solutions.
However, it is necessary in this text to refer to certain aspects of reception.
Versions 1.1.1 and 1.2.1 of the present document [i.7] and [i.8] defined a single profile which incorporates time-slicing
but not time-frequency-slicing (TFS). Features which would allow a possible future implementation of TFS (for
receivers with two tuners/front-ends) can be found in annex E. It is not intended that a receiver with a single tuner
should support TFS.
Version 1.3.1 of the present document [i.9] added a T2-Lite profile. This profile is intended to allow simpler receiver
implementations for very low capacity applications such as mobile broadcasting, although it may also be received by
conventional stationary receivers. The details of this T2-Lite profile are described in annex I. Version 1.3.1 of the
present document [i.9] also introduces a name, which is 'T2-base profile', for the previous single profile.
Version 1.4.1 (the present document) made a number of changes, but all of these are clarifications of particular points,
changes in non-normative recommendations, and corrections to the wording; no new technical features have been added
and no changes have been made to existing features.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
The following r
...

SLOVENSKI STANDARD
01-februar-2016
Digitalna videoradiodifuzija (DVB) - Struktura okvirov, kodiranje kanalov in
modulacija za drugo generacijo sistema digitalne prizemne televizijske
radiodifuzije (DVB-T2)
Digital Video Broadcasting (DVB);Frame structure channel coding and modulation for a
second generation digital terrestrial television broadcasting system (DVB-T2)
Ta slovenski standard je istoveten z: EN 302 755 V1.4.1
ICS:
33.170 Televizijska in radijska Television and radio
difuzija broadcasting
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

ETSI EN 3 302 755 V1.4.1 (201515-07)

EUROPEAN STANDARD
Digital Viideo Bd roadcasting (DVB);
Frame structure ce channel coding and modulalation
for a secondd g eneration digital terrestrialial
television broroadcasting system (DVB-T2)2)

2 ETSI EN 302 755 V1.4.1 (2015-07)

Reference
REN/JTC-DVB-349
Keywords
audio, broadcasting, data, digital, DVB, MPEG,
terrestrial, TV, video
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
http://portal.etsi.org/tb/status/status.asp
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2015.
© European Broadcasting Union 2015.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
3 ETSI EN 302 755 V1.4.1 (2015-07)
Contents
Intellectual Property Rights . 8
Foreword . 8
Modal verbs terminology . 8
1 Scope . 9
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 9
3 Definitions, symbols and abbreviations . 10
3.1 Definitions . 10
3.2 Symbols . 13
3.3 Abbreviations . 17
4 DVB-T2 System architecture . 19
4.1 System overview . 19
4.2 System architecture . 20
4.3 Target performance . 23
5 Input processing . 23
5.1 Mode adaptation . 23
5.1.0 Overview . 23
5.1.1 Input Formats . 23
5.1.2 Input Interface . 24
5.1.3 Input Stream Synchronization. 25
5.1.4 Compensating Delay for Transport Streams . 25
5.1.5 Null Packet Deletion (optional, for TS only, NM and HEM) . 25
5.1.6 CRC-8 encoding (for GFPS and TS, NM only) . 26
5.1.7 Baseband Header (BBHEADER) insertion . 26
5.1.8 Mode adaptation sub-system output stream formats . 28
5.2 Stream adaptation . 31
5.2.0 Overview . 31
5.2.1 Scheduler . 32
5.2.2 Padding . 32
5.2.3 Use of the padding field for in-band signalling . 32
5.2.3.0 Types and format . 32
5.2.3.1 In-band type A . 33
5.2.3.2 In-band type B . 35
5.2.4 BB scrambling . 36
6 Bit-interleaved coding and modulation . 37
6.1 FEC encoding . 37
6.1.0 Overview . 37
6.1.1 Outer encoding (BCH) . 38
6.1.2 Inner encoding (LDPC) . 40
6.1.2.0 Overview . 40
6.1.2.1 Inner coding for normal FECFRAME. 40
6.1.2.2 Inner coding for short FECFRAME . 41
6.1.3 Bit Interleaver (for 16-QAM, 64-QAM and 256-QAM). 41
6.2 Mapping bits onto constellations . 43
6.2.0 Overview . 43
6.2.1 Bit to cell word de-multiplexer . 43
6.2.2 Cell word mapping into I/Q constellations . 46
6.3 Constellation Rotation and Cyclic Q Delay . 50
6.4 Cell Interleaver . 50
6.5 Time Interleaver . 52
6.5.0 Overview . 52
6.5.1 Mapping of Interleaving Frames onto one or more T2-frames . 54
ETSI
4 ETSI EN 302 755 V1.4.1 (2015-07)
6.5.2 Division of Interleaving frames into Time Interleaving Blocks. 54
6.5.3 Interleaving of each TI-block. 55
6.5.4 Using the three Time Interleaving options with sub-slicing . 57
6.5.5 PLPs for which Time Interleaving is not used . 59
7 Generation, coding and modulation of Layer 1 signalling . 59
7.1 Introduction . 59
7.2 L1 signalling data . 60
7.2.0 Overview . 60
7.2.1 P1 Signalling data . 60
7.2.2 L1-Pre Signalling data . 62
7.2.3 L1-post signalling data . 66
7.2.3.0 Overview . 66
7.2.3.1 Configurable L1-post signalling . 67
7.2.3.2 Dynamic L1-post signalling . 72
7.2.3.3 Repetition of L1-post dynamic data . 73
7.2.3.4 L1-post extension field . 74
7.2.3.4.0 Overview . 74
7.2.3.4.1 Padding L1-post extension blocks . 75
7.2.3.5 CRC for the L1-post signalling . 75
7.2.3.6 L1 padding . 75
7.2.3.7 L1 bias balancing bits. 75
7.3 Modulation and error correction coding of the L1 data . 76
7.3.1 Overview . 76
7.3.1.1 Error correction coding and modulation of the L1-pre signalling . 76
7.3.1.2 Error correction coding and modulation of the L1-post signalling . 76
7.3.2 Scrambling and FEC Encoding . 78
7.3.2.1 Scrambling of L1-post information bits . 78
7.3.2.2 Zero padding of BCH information bits . 78
7.3.2.3 BCH encoding . 80
7.3.2.4 LDPC encoding . 80
7.3.2.5 Puncturing of LDPC parity bits . 80
7.3.2.6 Removal of zero padding bits. 82
7.3.2.7 Bit interleaving for L1-post signalling . 82
7.3.3 Mapping bits onto constellations . 82
7.3.3.0 Overview . 82
7.3.3.1 Demultiplexing of L1-post signalling . 83
7.3.3.2 Mapping into I/Q constellations . 83
7.3.3.3 Modification of L1 signalling constellations by L1-ACE algorithm . 83
8 Frame Builder . 85
8.0 Overview . 85
8.1 Frame structure . 85
8.2 Super-frame . 86
8.3 T2-Frame . 87
8.3.0 Overview . 87
8.3.1 Duration of the T2-Frame . 87
8.3.2 Capacity and structure of the T2-frame . 88
8.3.3 Signalling of the T2-frame structure and PLPs . 90
8.3.4 Overview of the T2-frame mapping . 91
8.3.5 Mapping of L1 signalling information to P2 symbol(s) . 91
8.3.6 Mapping the PLPs . 93
8.3.6.0 Overview . 93
8.3.6.1 Allocating the cells of the Interleaving Frames to the T2-Frames . 93
8.3.6.2 Addressing of OFDM cells . 94
8.3.6.3 Mapping the PLPs to the data cell addresses. 95
8.3.6.3.0 Overview . 95
8.3.6.3.1 Insertion of bias balancing cells . 95
8.3.6.3.2 Mapping the Common and Type 1 PLPs . 97
8.3.6.3.3 Mapping the Type 2 PLPs . 97
8.3.7 Auxiliary stream insertion . 98
8.3.8 Dummy cell insertion. 99
ETSI
5 ETSI EN 302 755 V1.4.1 (2015-07)
8.3.9 Insertion of unmodulated cells in the Frame Closing Symbol . 99
8.4 Future Extension Frames (FEF) . 99
8.5 Frequency interleaver . 100
9 OFDM Generation . 105
9.0 Overview . 105
9.1 MISO Processing . 105
9.2 Pilot insertion . 106
9.2.1 Introduction. 106
9.2.2 Definition of the reference sequence . 106
9.2.2.0 Overview . 106
9.2.2.1 Symbol level . 107
9.2.2.2 Frame level . 108
9.2.3 Scattered pilot insertion . 108
9.2.3.0 Overview . 108
9.2.3.1 Locations of the scattered pilots . 108
9.2.3.2 Amplitudes of the scattered pilots . 110
9.2.3.3 Modulation of the scattered pilots . 110
9.2.4 Continual pilot insertion . 110
9.2.4.0 Overview . 110
9.2.4.1 Locations of the continual pilots . 110
9.2.4.2 Locations of additional continual pilots in extended carrier mode . 111
9.2.4.3 Amplitudes of the Continual Pilots . 111
9.2.4.4 Modulation of the Continual Pilots . 111
9.2.5 Edge pilot insertion . 111
9.2.6 P2 pilot insertion . 111
9.2.6.1 Locations of the P2 pilots . 111
9.2.6.2 Amplitudes of the P2 pilots . 111
9.2.6.3 Modulation of the P2 pilots . 112
9.2.7 Insertion of frame closing pilots . 112
9.2.7.0 Overview . 112
9.2.7.1 Locations of the frame closing pilots . 112
9.2.7.2 Amplitudes of the frame closing pilots . 112
9.2.7.3 Modulation of the frame closing pilots . 113
9.2.8 Modification of the pilots for MISO . 113
9.3 Dummy tone reservation . 114
9.4 Mapping of data cells to OFDM carriers . 114
9.5 IFFT - OFDM Modulation . 115
9.6 PAPR Reduction . 116
9.6.0 Overview . 116
9.6.1 Active Constellation Extension. 117
9.6.2 PAPR reduction using tone reservation . 119
9.6.2.0 Overview . 119
9.6.2.1 Algorithm of PAPR reduction using tone reservation . 119
9.7 Guard interval insertion . 121
9.8 P1 Symbol insertion . 121
9.8.1 P1 Symbol overview . 121
9.8.2 P1 Symbol description . 121
9.8.2.0 Overview . 121
9.8.2.1 Carrier Distribution in P1 symbol . 123
9.8.2.2 Modulation of the Active Carriers in P1 . 123
9.8.2.3 Boosting of the Active Carriers . 125
9.8.2.4 Generation of the time domain P1 signal . 126
9.8.2.4.1 Generation of the main part of the P1 signal . 126
9.8.2.4.2 Frequency Shifted repetition in Guard Intervals . 126
10 Spectrum characteristics . 126
Annex A (normative): Addresses of parity bit accumulators for N = 64 800 . 129
ldpc
Annex B (normative): Addresses of parity bit accumulators for N = 16 200 . 136
ldpc
Annex C (normative): Additional Mode Adaptation tools . 139
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6 ETSI EN 302 755 V1.4.1 (2015-07)
C.1 Input stream synchronizer . 139
C.1.0 ISSY definition and signalling . 139
C.1.1 Receiver Buffer Model . 141
C.1.2 Requirements of input signal . 144
Annex D (normative): Splitting of input MPEG-2 TSs into the data PLPs and common PLP
of a group of PLPs . 146
D.1 Overview . 146
D.2 Splitting of input TS into a TSPS stream and a TSPSC stream . 147
D.2.1 General . 147
D.2.2 Co-timed TS packets that are identical on all input TSs of the group before the split . 147
D.2.3 Co-timed TS packets carrying Service Description Table (SDT) and not having the characteristic of
category (1) . 148
D.2.4 Co-timed TS packets carrying Event Information Table (EIT) and not having the characteristic of
category (1) . 150
D.2.4.0 Overview . 150
D.2.4.1 Required operations . 150
D.2.4.2 Conditions . 150
D.3 Receiver Implementation Considerations. 152
Annex E (informative): T2-frame structure for Time-Frequency Slicing . 153
E.1 General . 153
E.2 T2-frame structure . 154
E.2.1 Duration and capacity of the T2-frame. 154
E.2.2 Overall structure of the T2-frame . 154
E.2.3 Structure of the Type-2 part of the T2-frame . 155
E.2.4 Restrictions on frame structure to allow tuner switching time . 156
E.2.5 Signalling of the dynamic parameters in a TFS configuration . 157
E.2.6 Indexing of RF channels . 157
E.2.7 Mapping the PLPs . 158
E.2.7.0 Overview . 158
E.2.7.1 Mapping the Common and Type 1 PLPs . 158
E.2.7.2 Mapping the Type 2 PLPs . 158
E.2.7.2.0 Overview . 158
E.2.7.2.1 Allocating the cells of the Interleaving Frame to the T2-Frames . 159
E.2.7.2.2 Size of the sub-slices . 160
E.2.7.2.3 Allocation of cell addresses to the sub-slices on RF . 160
start
E.2.7.2.4 Allocation of cell addresses to the sub-slices on the other RF channels . 161
E.2.7.2.5 Mapping the PLP cells to the allocated cell addresses . 162
E.2.8 Auxiliary streams and dummy cells . 162
Annex F (normative): Calculation of the CRC word . 163
Annex G (normative): Locations of the continual pilots . 164
Annex H (normative): Reserved carrier indices for PAPR reduction . 168
Annex I (normative): T2-Lite . 170
I.1 Overview . 170
I.2 In-band signalling . 170
I.3 FEC encoding for T2-Lite . 170
I.4 Bit to cell word de-multiplexer . 171
I.5 Modulation limitations for T2-Lite . 172
I.6 T2-Lite L1-signalling . 172
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I.7 T2-Lite mode limitations . 173
I.7.0 Overview . 173
I.7.1 FFT size limitations . 173
I.7.2 Pilot pattern limitations . 173
I.7.3 Limitations on mode combinations . 173
I.8 T2-Lite time interleaver memory . 173
I.9 T2-Lite signal structure . 174
I.10 T2-Lite PLP data rate limitations . 174
I.11 T2-Lite receiver buffer model limitations . 175
Annex J (informative): Transport Stream regeneration and clock recovery using ISCR . 176
Annex K (informative): Pilot patterns . 177
Annex L (informative): Allowable sub-slicing values . 185
Annex M (informative): Bibliography . 187
History . 188

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8 ETSI EN 302 755 V1.4.1 (2015-07)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This European Standard (EN) has been produced by Joint Technical Committee (JTC) Broadcast of the European
Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique (CENELEC) and the European
Telecommunications Standards Institute (ETSI).
NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards in the
specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body
by including in the Memorandum of Understanding also CENELEC, which is responsible for the
standardization of radio and television receivers. The EBU is a professional association of broadcasting
organizations whose work includes the co-ordination of its members' activities in the technical, legal,
programme-making and programme-exchange domains. The EBU has active members in about
60 countries in the European broadcasting area; its headquarters is in Geneva.
European Broadcasting Union
CH-1218 GRAND SACONNEX (Geneva)
Switzerland
Tel: [phone]
Fax: [phone]
The Digital Video Broadcasting Project (DVB) is an industry-led consortium of broadcasters, manufacturers, network
operators, software developers, regulatory bodies, content owners and others committed to designing global standards
for the delivery of digital television and data services. DVB fosters market driven solutions that meet the needs and
economic circumstances of broadcast industry stakeholders and consumers. DVB standards cover all aspects of digital
television from transmission through interfacing, conditional access and interactivity for digital video, audio and data.
The consortium came together in 1993 to provide global standardization, interoperability and future proof
specifications.
National transposition dates
Date of adoption of this EN: 23 June 2015
Date of latest announcement of this EN (doa): 30 September 2015
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 2016
Date of withdrawal of any conflicting National Standard (dow): 31 March 2016

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
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9 ETSI EN 302 755 V1.4.1 (2015-07)
1 Scope
The present document describes a second generation baseline transmission system for digital terrestrial television
broadcasting. It specifies the channel coding/modulation system intended for digital television services and generic data
streams.
The scope is as follows:
• it gives a general description of the Baseline System for digital terrestrial TV;
• it specifies the digitally modulated signal in order to allow compatibility between pieces of equipment
developed by different manufacturers. This is achieved by describing in detail the signal processing at the
modulator side, while the processing at the receiver side is left open to different implementation solutions.
However, it is necessary in this text to refer to certain aspects of reception.
Versions 1.1.1 and 1.2.1 of the present document [i.7] and [i.8] defined a single profile which incorporates time-slicing
but not time-frequency-slicing (TFS). Features which would allow a possible future implementation of TFS (for
receivers with two tuners/front-ends) can be found in annex E. It is not intended that a receiver with a single tuner
should support TFS.
Version 1.3.1 of the present document [i.9] added a T2-Lite profile. This profile is intended to allow simpler receiver
implementations for very low capacity applications such as mobile broadcasting, although it may also be received by
conventional stationary receivers. The
...