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)
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
Buy Standard
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 302 755 V1.4.1:2016
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
SIST EN 302 755 V1.4.1:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 302 755 V1.4.1:2016
---------------------- Page: 2 ----------------------
SIST EN 302 755 V1.4.1:2016
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)
---------------------- Page: 3 ----------------------
SIST EN 302 755 V1.4.1:2016
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.: +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
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
---------------------- Page: 4 ----------------------
SIST EN 302 755 V1.4.1:2016
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
---------------------- Page: 5 ----------------------
SIST EN 302 755 V1.4.1:2016
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
---------------------- Page: 6 ----------------------
SIST EN 302 755 V1.4.1:2016
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 .
...
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)
---------------------- Page: 1 ----------------------
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.: +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
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
---------------------- Page: 2 ----------------------
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
---------------------- Page: 3 ----------------------
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
---------------------- Page: 4 ----------------------
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
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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 .
...
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)
---------------------- Page: 1 ----------------------
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
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ETSI
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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
ETSI
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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
ETSI
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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 .
...
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