SIST EN 302 755 V1.3.1:2012

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

2 ETSI EN 302 755 V1.3.1 (2012-04)

Reference
REN/JTC-DVB-308
Keywords
audio, broadcasting, data, digital, DVB, MPEG,
terrestrial, TV, video
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

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
Individual copies of the present document can be downloaded from:
http://www.etsi.org
The present document may be made available in more than one electronic version or in print. In any case of existing or
perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF).
In case of dispute, the reference shall be the printing on ETSI printers of the 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:
http://portal.etsi.org/chaircor/ETSI_support.asp
Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2012.
© European Broadcasting Union 2012.
All rights reserved.
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3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
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ETSI
3 ETSI EN 302 755 V1.3.1 (2012-04)
Contents
Intellectual Property Rights . 7
Foreword . 7
1 Scope . 8
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 8
3 Definitions, symbols and abbreviations . 9
3.1 Definitions . 9
3.2 Symbols . 12
3.3 Abbreviations . 16
4 DVB-T2 System architecture . 18
4.1 System overview . 18
4.2 System architecture . 19
4.3 Target performance . 21
5 Input processing . 22
5.1 Mode adaptation . 22
5.1.1 Input Formats . 22
5.1.2 Input Interface . 23
5.1.3 Input Stream Synchronization (Optional) . 23
5.1.4 Compensating Delay for Transport Streams . 24
5.1.5 Null Packet Deletion (optional, for TS only, NM and HEM) . 24
5.1.6 CRC-8 encoding (for GFPS and TS, NM only) . 25
5.1.7 Baseband Header (BBHEADER) insertion . 25
5.1.8 Mode adaptation sub-system output stream formats . 26
5.2 Stream adaptation . 29
5.2.1 Scheduler . 30
5.2.2 Padding . 30
5.2.3 Use of the padding field for in-band signalling . 30
5.2.3.1 In-band type A . 31
5.2.3.2 In-band type B . 33
5.2.4 BB scrambling . 34
6 Bit-interleaved coding and modulation . 35
6.1 FEC encoding . 35
6.1.1 Outer encoding (BCH) . 36
6.1.2 Inner encoding (LDPC) . 38
6.1.2.1 Inner coding for normal FECFRAME. 38
6.1.2.2 Inner coding for short FECFRAME . 39
6.1.3 Bit Interleaver (for 16-QAM, 64-QAM and 256-QAM). 40
6.2 Mapping bits onto constellations . 41
6.2.1 Bit to cell word de-multiplexer . 42
6.2.2 Cell word mapping into I/Q constellations . 45
6.3 Constellation Rotation and Cyclic Q Delay . 50
6.4 Cell Interleaver . 50
6.5 Time Interleaver . 52
6.5.1 Mapping of Interleaving Frames onto one or more T2-frames . 54
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
ETSI
4 ETSI EN 302 755 V1.3.1 (2012-04)
7.2.1 P1 Signalling data . 60
7.2.2 L1-Pre Signalling data . 62
7.2.3 L1-post signalling data . 66
7.2.3.1 Configurable L1-post signalling . 67
7.2.3.2 Dynamic L1-post signalling . 72
7.2.3.3 Repetition of L1-post dynamic data . 74
7.2.3.4 L1-post extension field . 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 . 81
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 . 83
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
8.1 Frame structure . 85
8.2 Super-frame . 86
8.3 T2-Frame . 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
8.3.6.1 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
8.3.6.3.1 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
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
9.1 MISO Processing . 105
9.2 Pilot insertion . 106
9.2.1 Introduction. 106
9.2.2 Definition of the reference sequence . 106
9.2.2.1 Symbol level . 107
9.2.2.2 Frame level . 108
9.2.3 Scattered pilot insertion . 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
ETSI
5 ETSI EN 302 755 V1.3.1 (2012-04)
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
9.2.7.1 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
9.6.1 Active Constellation Extension. 117
9.6.2 PAPR reduction using tone reservation . 118
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
9.8.2.1 Carrier Distribution in P1 symbol . 122
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
C.1 Input stream synchronizer . 139
C.1.1 Receiver Buffer Model . 141
C.1.2 Requirements of input signal . 143
Annex D (normative): Splitting of input MPEG-2 TSs into the data PLPs and common PLP
of a group of PLPs . 145
D.1 Overview . . 145
D.2 Splitting of input TS into a TSPS stream and a TSPSC stream . 146
D.2.1 General . 146
D.2.2 TS packets that are co-timed and identical on all input TSs of the group before the split. 147
D.2.3 TS packets carrying Service Description Table (SDT) and not having the characteristics of category (1) . 147
D.2.4 TS packets carrying Event Information Table (EIT) and not having the characteristics of category (1) . 149
D.2.4.1 Required operations . 149
D.2.4.2 Conditions . 149
D.3 Receiver Implementation Considerations. 151
Annex E (informative): T2-frame structure for Time-Frequency Slicing . 152
E.1 General . 152
E.2 T2-frame structure . 153
ETSI
6 ETSI EN 302 755 V1.3.1 (2012-04)
E.2.1 Duration and capacity of the T2-frame. 153
E.2.2 Overall structure of the T2-frame . 153
E.2.3 Structure of the Type-2 part of the T2-frame . 154
E.2.4 Restrictions on frame structure to allow tuner switching time . 155
E.2.5 Signalling of the dynamic parameters in a TFS configuration . 156
E.2.6 Indexing of RF channels . 156
E.2.7 Mapping the PLPs . 157
E.2.7.1 Mapping the Common and Type 1 PLPs . 157
E.2.7.2 Mapping the Type 2 PLPs . 157
E.2.7.2.1 Allocating the cells of the Interleaving Frame to the T2-Frames . 157
E.2.7.2.2 Size of the sub-slices . 158
E.2.7.2.3 Allocation of cell addresses to the sub-slices on RF . 159
start
E.2.7.2.4 Allocation of cell addresses to the sub-slices on the other RF channels . 159
E.2.7.2.5 Mapping the PLP cells to the allocated cell addresses . 161
E.2.8 Auxiliary streams and dummy cells . 161
Annex F (normative): Calculation of the CRC word . 162
Annex G (normative): Locations of the continual pilots . 163
Annex H (normative): Reserved carrier indices for PAPR reduction . 167
Annex I (normative): T2-Lite . 169
I.1 Overview . . 169
I.2 In-band signalling . 169
I.3 FEC encoding for T2-Lite . 169
I.4 Bit to cell word de-multiplexer . 170
I.5 Modulation limitations for T2-Lite . 171
I.6 T2-Lite L1-signalling . 171
I.7 T2-Lite mode limitations . 172
I.7.1 FFT size limitations . 172
I.7.2 Pilot pattern limitations . 172
I.7.3 Limitations on mode combinations . 172
I.8 T2-Lite time interleaver memory . 173
I.9 T2-Lite signal structure . 173
I.10 T2-Lite PLP data rate limitations . 173
I.11 T2-Lite receiver buffer model limitations . 174
Annex J (informative): Transport Stream regeneration and clock recovery using ISCR . 175
Annex K (informative): Pilot patterns . 176
Annex L (informative): Allowable sub-slicing values . 184
Annex M (informative): Bibliography . 187
History . 188

ETSI
7 ETSI EN 302 755 V1.3.1 (2012-04)
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: +41 22 717 21 11
Fax: +41 22 717 24 81
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 standardisation, interoperability and future proof
specifications.
National transposition dates
Date of adoption of this EN: 19 March 2012
Date of latest announcement of this EN (doa): 30 June 2012
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 December 2012
Date of withdrawal of any conflicting National Standard (dow): 31 December 2012

ETSI
8 ETSI EN 302 755 V1.3.1 (2012-04)
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 this specification 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.
The present document (version 1.3.1 of this specification) adds 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 also introduces a name, which is 'T2-base profile', for the previous single profile.
2 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.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 101 162: "Digital Video Broadcasting (DVB); Allocation of identifiers and codes for
Digital Video Broadcasting (DVB) systems".
[2] ETSI TS 102 992: "Digital Video Broadcasting (DVB); Structure and modulation of optional
transmitter signatures (T2-TX-SIG) for use with the DVB-T2 second generation digital terrestrial
television broadcasting system".
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ISO/IEC 13818-1: "Information technology - Generic coding of moving pictures and associated
audio information: Systems".
[i.2] ETSI TS 102 606: "Digital Video Broadcasting (DVB); Generic Stream Encapsulation (GSE)
Protocol".
ETSI
9 ETSI EN 302 755 V1.3.1 (2012-04)
[i.3] ETSI EN 302 307: "Digital Video Broadcasting (DVB); Second generation framing structure,
channel coding and modulation systems for Broadcasting, Interactive Services, News Gathering
and other broadband satellite applications (DVB-S2)".
[i.4] ETSI EN 300 468: "Digital Video Broadcasting (DVB); Specification for Service Information (SI)
in DVB systems".
[i.5] ETSI EN 300 744: "Digital Video Broadcasting (DVB); Framing structure, channel coding and
modulation for digital terrestrial television".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
0xkk: digits 'kk' should be interpreted as a hexadecimal number
active cell: OFDM cell carrying a constellation point for L1 signalling or a PLP
auxiliary stream: sequence of cells carrying data of as yet undefined modulation and coding, which may be used for
future extensions or as required by broadcasters or network operators
BBFRAME: set of K bits which form the input to one FEC encoding process (BCH and LDPC endcoding)
bch
bias balancing cells: special cells inserted into the P2 symbols to reduce the effect of the bias in the L1 signalling
common PLP: PLP having one slice per T2-frame, transmitted after the L1 signalling and any bias balancing cells,
which may contain data shared by multiple PLPs
configurable L1-signalling: L1 signalling consisting of parameters which remain the same for the duration of one
super-frame
data cell: OFDM cell which is not a pilot or tone reservation cell (may be an unmodulated cell in the Frame Closing
Symbol)
data PLP: PLP of Type 1 or Type 2
data symbol: OFDM symbol in a T2-frame which is not a P1 or P2 symbol
div: integer division operator, defined as:
⎢ ⎥
x
x div y =
⎢ ⎥
y
⎣ ⎦
dummy cell: OFDM cell carrying a pseudo-random value used to fill the remaining capacity not used for L1 signalling,
PLPs or Auxiliary Streams
dynamic L1-signalling: L1 signalling consisting of parameters which may change from one T2-frame to the next
elementary period: time period which depends on the system bandwidth and is used to define the other time periods in
the T2 system
FEC Block: set of N OFDM cells carrying all the bits of one LDPC FECFRAME
cells
FECFRAME: set of N (16 200 or 64 800) bits from one LDPC encoding operation
ldpc
FEF part: part of the super-frame between two T2-frames which contains FEFs
NOTE: A FEF part always starts with a P1 symbol. The remaining contents of the FEF part should be ignored by
a DVB-T2 receiver and may contain further P1 symbols.
ETSI
10 ETSI EN 302 755 V1.3.1 (2012-04)
FFT size: nominal FFT size used for a particular mode, equal to the active symbol period T expressed in cycles of the
s
elementary period T
for i=0.xxx-1: the corresponding signalling loop is repeated as many times as there are elements of the loop
NOTE: If there are no elements, the whole loop is omitted.
frame closing symbol: OFDM symbol with higher pilot density used at the end of a T2-frame in certain combinations
of FFT size, guard interval and scattered pilot pattern
Im(x): imaginary part of x
interleaving frame: unit over which dynamic capacity allocation for a particular PLP is carried out, made up of an
integer, dynamically varying number of FEC blocks and having a fixed relationship to the T2-frames
NOTE: The Interleaving Frame may be mapped directly to one T2-frame or may be mapped to multiple
T2-frames. It may contain one or more TI-blocks.
L1 bias balancing bits: unused bits within the L1 signalling fields which are nominated to be set so as to reduce the
overall bias in the L1 signalling
L1-post signalling: signalling carried in the P2 symbol carrying more detailed L1 information about the T2 system and
the PLPs
L1-pre signalling: signalling carried in the P2 symbols having a fixed size, coding and modulation, including basic
information about the T2 system as well as information needed to decode the L1-post signalling
NOTE: L1-pre signalling remains the same for the duration of a super-frame.
MISO group: group (1 or 2) to which a particular transmitter in a MISO network belongs, determining the type of
processing which is performed to the data cells and the pilots
NOTE: Signals from transmitters in different groups will combine in an optimal manner at the receiver.
mod: modulo operator, defined as:
⎢ ⎥
x
x mod y = x − y
⎢ ⎥
y
⎣ ⎦
nn : digits 'nn' should be interpreted as a decimal number
D
normal symbol: OFDM symbol in a T2-frame which is not a P1, P2 or Frame Closing symbol
OFDM cell: modulation value for one OFDM carrier during one OFDM symbol, e.g. a single constellation point
OFDM symbol: waveform Ts in duration comprising all the active carriers modulated with their corresponding
modulation values and including the guard interval
P1 signalling: signalling carried by the P1 symbol and used to identify the basic mode of the DVB-T2 symbol
P1 symbol: fixed pilot symbol that carries S1 and S2 signalling fields and is located in the beginning of the frame
within each RF-channel
NOTE: The P1 symbol is mainly used for fast initial band scan to detect the T2 signal, its timing, frequency
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.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)33.170Televizijska in radijska difuzijaTelevision and radio broadcastingICS:Ta slovenski standard je istoveten z:EN 302 755 Version 1.3.1SIST EN 302 755 V1.3.1:2012en01-junij-2012SIST EN 302 755 V1.3.1:2012SLOVENSKI
STANDARD
European Standard SIST EN 302 755 V1.3.1:2012

ETSI ETSI EN 302 755 V1.3.1 (2012-04) 2
Reference REN/JTC-DVB-308 Keywords audio, broadcasting, data, digital, DVB, MPEG, terrestrial, TV, video ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16
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 Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the 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: http://portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2012. © European Broadcasting Union 2012. All rights reserved.
DECTTM, PLUGTESTSTM, UMTSTM and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM 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. SIST EN 302 755 V1.3.1:2012

ETSI ETSI EN 302 755 V1.3.1 (2012-04) 3 Contents Intellectual Property Rights . 7 Foreword . 7 1 Scope . 8 2 References . 8 2.1 Normative references . 8 2.2 Informative references . 8 3 Definitions, symbols and abbreviations . 9 3.1 Definitions . 9 3.2 Symbols . 12 3.3 Abbreviations . 16 4 DVB-T2 System architecture . 18 4.1 System overview . 18 4.2 System architecture . 19 4.3 Target performance . 21 5 Input processing . 22 5.1 Mode adaptation . 22 5.1.1 Input Formats . 22 5.1.2 Input Interface . 23 5.1.3 Input Stream Synchronization (Optional) . 23 5.1.4 Compensating Delay for Transport Streams . 24 5.1.5 Null Packet Deletion (optional, for TS only, NM and HEM) . 24 5.1.6 CRC-8 encoding (for GFPS and TS, NM only) . 25 5.1.7 Baseband Header (BBHEADER) insertion . 25 5.1.8 Mode adaptation sub-system output stream formats . 26 5.2 Stream adaptation . 29 5.2.1 Scheduler . 30 5.2.2 Padding . 30 5.2.3 Use of the padding field for in-band signalling . 30 5.2.3.1 In-band type A . 31 5.2.3.2 In-band type B . 33 5.2.4 BB scrambling . 34 6 Bit-interleaved coding and modulation . 35 6.1 FEC encoding . 35 6.1.1 Outer encoding (BCH) . 36 6.1.2 Inner encoding (LDPC) . 38 6.1.2.1 Inner coding for normal FECFRAME. 38 6.1.2.2 Inner coding for short FECFRAME . 39 6.1.3 Bit Interleaver (for 16-QAM, 64-QAM and 256-QAM). 40 6.2 Mapping bits onto constellations . 41 6.2.1 Bit to cell word de-multiplexer . 42 6.2.2 Cell word mapping into I/Q constellations . 45 6.3 Constellation Rotation and Cyclic Q Delay . 50 6.4 Cell Interleaver . 50 6.5 Time Interleaver . 52 6.5.1 Mapping of Interleaving Frames onto one or more T2-frames . 54 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 SIST EN 302 755 V1.3.1:2012

ETSI ETSI EN 302 755 V1.3.1 (2012-04) 4 7.2.1 P1 Signalling data . 60 7.2.2 L1-Pre Signalling data . 62 7.2.3 L1-post signalling data . 66 7.2.3.1 Configurable L1-post signalling . 67 7.2.3.2 Dynamic L1-post signalling . 72 7.2.3.3 Repetition of L1-post dynamic data . 74 7.2.3.4 L1-post extension field . 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 . 81 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 . 83 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 8.1 Frame structure . 85 8.2 Super-frame . 86 8.3 T2-Frame . 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 8.3.6.1 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 8.3.6.3.1 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 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 9.1 MISO Processing . 105 9.2 Pilot insertion . 106 9.2.1 Introduction. 106 9.2.2 Definition of the reference sequence . 106 9.2.2.1 Symbol level . 107 9.2.2.2 Frame level . 108 9.2.3 Scattered pilot insertion . 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 SIST EN 302 755 V1.3.1:2012

ETSI ETSI EN 302 755 V1.3.1 (2012-04) 5 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 9.2.7.1 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 9.6.1 Active Constellation Extension. 117 9.6.2 PAPR reduction using tone reservation . 118 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 9.8.2.1 Carrier Distribution in P1 symbol . 122 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 Nldpc = 64 800 . 129 Annex B (normative): Addresses of parity bit accumulators for Nldpc = 16 200 . 136 Annex C (normative): Additional Mode Adaptation tools . 139 C.1 Input stream synchronizer . 139 C.1.1 Receiver Buffer Model . 141 C.1.2 Requirements of input signal . 143 Annex D (normative): Splitting of input MPEG-2 TSs into the data PLPs and common PLP of a group of PLPs . 145 D.1 Overview . 145 D.2 Splitting of input TS into a TSPS stream and a TSPSC stream . 146 D.2.1 General . 146 D.2.2 TS packets that are co-timed and identical on all input TSs of the group before the split. 147 D.2.3 TS packets carrying Service Description Table (SDT) and not having the characteristics of category (1) . 147 D.2.4 TS packets carrying Event Information Table (EIT) and not having the characteristics of category (1) . 149 D.2.4.1 Required operations . 149 D.2.4.2 Conditions . 149 D.3 Receiver Implementation Considerations. 151 Annex E (informative): T2-frame structure for Time-Frequency Slicing . 152 E.1 General . 152 E.2 T2-frame structure . 153 SIST EN 302 755 V1.3.1:2012

ETSI ETSI EN 302 755 V1.3.1 (2012-04) 6 E.2.1 Duration and capacity of the T2-frame. 153 E.2.2 Overall structure of the T2-frame . 153 E.2.3 Structure of the Type-2 part of the T2-frame . 154 E.2.4 Restrictions on frame structure to allow tuner switching time . 155 E.2.5 Signalling of the dynamic parameters in a TFS configuration . 156 E.2.6 Indexing of RF channels . 156 E.2.7 Mapping the PLPs . 157 E.2.7.1 Mapping the Common and Type 1 PLPs . 157 E.2.7.2 Mapping the Type 2 PLPs . 157 E.2.7.2.1 Allocating the cells of the Interleaving Frame to the T2-Frames . 157 E.2.7.2.2 Size of the sub-slices . 158 E.2.7.2.3 Allocation of cell addresses to the sub-slices on RFstart . 159 E.2.7.2.4 Allocation of cell addresses to the sub-slices on the other RF channels . 159 E.2.7.2.5 Mapping the PLP cells to the allocated cell addresses . 161 E.2.8 Auxiliary streams and dummy cells . 161 Annex F (normative): Calculation of the CRC word . 162 Annex G (normative): Locations of the continual pilots . 163 Annex H (normative): Reserved carrier indices for PAPR reduction . 167 Annex I (normative): T2-Lite . 169 I.1 Overview . 169 I.2 In-band signalling . 169 I.3 FEC encoding for T2-Lite . 169 I.4 Bit to cell word de-multiplexer . 170 I.5 Modulation limitations for T2-Lite . 171 I.6 T2-Lite L1-signalling . 171 I.7 T2-Lite mode limitations . 172 I.7.1 FFT size limitations . 172 I.7.2 Pilot pattern limitations . 172 I.7.3 Limitations on mode combinations . 172 I.8 T2-Lite time interleaver memory . 173 I.9 T2-Lite signal structure . 173 I.10 T2-Lite PLP data rate limitations . 173 I.11 T2-Lite receiver buffer model limitations . 174 Annex J (informative): Transport Stream regeneration and clock recovery using ISCR . 175 Annex K (informative): Pilot patterns . 176 Annex L (informative): Allowable sub-slicing values . 184 Annex M (informative): Bibliography . 187 History . 188
ETSI ETSI EN 302 755 V1.3.1 (2012-04) 7 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: +41 22 717 21 11 Fax: +41 22 717 24 81
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 standardisation, interoperability and future proof specifications.
National transposition dates Date of adoption of this EN: 19 March 2012 Date of latest announcement of this EN (doa): 30 June 2012 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
31 December 2012 Date of withdrawal of any conflicting National Standard (dow): 31 December 2012
ETSI ETSI EN 302 755 V1.3.1 (2012-04) 8 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 this specification 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. The present document (version 1.3.1 of this specification) adds 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 also introduces a name, which is 'T2-base profile', for the previous single profile. 2 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. 2.1 Normative references The following referenced documents are necessary for the application of the present document. [1] ETSI TS 101 162: "Digital Video Broadcasting (DVB); Allocation of identifiers and codes for Digital Video Broadcasting (DVB) systems". [2] ETSI TS 102 992: "Digital Video Broadcasting (DVB); Structure and modulation of optional transmitter signatures (T2-TX-SIG) for use with the DVB-T2 second generation digital terrestrial television broadcasting system". 2.2 Informative references The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. [i.1] ISO/IEC 13818-1: "Information technology - Generic coding of moving pictures and associated audio information: Systems". [i.2] ETSI TS 102 606: "Digital Video Broadcasting (DVB); Generic Stream Encapsulation (GSE) Protocol". SIST EN 302 755 V1.3.1:2012

ETSI ETSI EN 302 755 V1.3.1 (2012-04) 9 [i.3] ETSI EN 302 307: "Digital Video Broadcasting (DVB); Second generation framing structure, channel coding and modulation systems for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications (DVB-S2)". [i.4] ETSI EN 300 468: "Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems". [i.5] ETSI EN 300 744: "Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television". 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: 0xkk: digits 'kk' should be interpreted as a hexadecimal number active cell: OFDM cell carrying a constellation point for L1 signalling or a PLP auxiliary stream: sequence of cells carrying data of as yet undefined modulation and coding, which may be used for future extensions or as required by broadcasters or network operators BBFRAME: set of Kbch bits which form the input to one FEC encoding process (BCH and LDPC endcoding) bias balancing cells: special cells inserted into the P2 symbols to reduce the effect of the bias in the L1 signalling common PLP: PLP having one slice per T2-frame, transmitted after the L1 signalling and any bias balancing cells, which may contain data shared by multiple PLPs configurable L1-signalling: L1 signalling consisting of parameters which remain the same for the duration of one super-frame data cell: OFDM cell which is not a pilot or tone reservation cell (may be an unmodulated cell in the Frame Closing Symbol) data PLP: PLP of Type 1 or Type 2 data symbol: OFDM symbol in a T2-frame which is not a P1 or P2 symbol div: integer division operator, defined as:
x div y⎥⎦⎥⎢⎣⎢=yx dummy cell: OFDM cell carrying a pseudo-random value used to fill the remaining capacity not used for L1 signalling, PLPs or Auxiliary Streams dynamic L1-signalling: L1 signalling consisting of parameters which may change from one T2-frame to the next elementary period: time period which depends on the system bandwidth and is used to define the other time periods in the T2 system FEC Block: set of Ncells OFDM cells carrying all the bits of one LDPC FECFRAME FECFRAME: set of Nldpc (16 200 or 64 800) bits from one LDPC encoding operation FEF part: part of the super-frame between two T2-frames which contains FEFs NOTE: A FEF part always starts with a P1 symbol. The remaining contents of the FEF part should be ignored by a DVB-T2 receiver and may contain further P1 symbols. SIST EN 302 755 V1.3.1:2012

ETSI ETSI EN 302 755 V1.3.1 (2012-04) 10 FFT size: nominal FFT size used for a particular mode, equal to the active symbol period Ts expressed in cycles of the elementary period T for i=0.xxx-1: the corresponding signalling loop is repeated as many times as there are elements of the loop NOTE: If there are no elements, the whole loop is omitted. frame closing symbol: OFDM symbol with higher pilot density used at the end of a T2-frame in certain combinations of FFT size, guard interval and scattered pilot pattern Im(x): imaginary part of x interleaving frame: unit over which dynamic capacity allocation for a particular PLP is carried out, made up of an integer, dynamically varying number of FEC blocks and having a fixed relationship to the T2-frames NOTE: The Interleaving Frame may be mapped directly to one T2-frame or may be mapped to multiple T2-frames. It may contain one or more TI-blocks. L1 bias balancing bits: unused bits within the L1 signalling fields which are nominated to be set so as to reduce the overall bias in the L1 signalling L1-post signalling: signalling carried in the P2 symbol carrying more detailed L1 information about the T2 system and the PLPs L1-pre signalling: signalling carried in the P2 symbols having a fixed size, coding and modulation, including basic information about the T2 system as well as information needed to decode the L1-post signalling NOTE: L1-pre signalling remains the same for the duration of a super-frame. MISO group: group (1 or 2) to which a particular transmitter in a MISO network belongs, determining the type of processing which is performed to the data cells and the pilots NOTE: Signals from transmitters in different groups will combine in an optimal manner at the receiver. mod: modulo operator, defined as:
⎥⎦⎥⎢⎣⎢−=yxyxyxmod nnD: digits 'nn' should be interpreted as a decimal number normal symbol: OFDM symbol in a T2-frame which is not a P1, P2 or Frame Closing symbol OFDM cell: modulation value for one OFDM carrier during one OFDM symbol, e.g. a single constellation point OFDM symbol: waveform Ts in duration comprising all the active carriers modulated with their corresponding modulation values and including the guard interval P1 signalling: signalling carried by the P1 symbol and used to identify the basic mode of the DVB-T2 symbol P1 symbol: fixed pilot symbol that carries S1 and S2 signalling fields and is located in the beginning of the frame within each RF-channel NOTE: The P1 symbol is mainly used for fast initial band scan to detect the T2 signal, its timing, frequency offset, and FFT-s
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