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STANDARD
SIST EN 302 755 V1.1.1:2009
ETSI EN 302 755 V1.1.1 (2009-09)European Standard (Telecommunications series) Digital Video Broadcasting (DVB);Frame structure channel coding and modulationfor a second generation digital terrestrialtelevision broadcasting system (DVB-T2)
SIST EN 302 755 V1.1.1:2009
ETSI ETSI EN 302 755 V1.1.1 (2009-09) 2
Reference DEN/JTC-DVB-228 Keywords audio, broadcasting, data, digital, DVB, MPEG, terrestrial, TV, video ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
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© European Telecommunications Standards Institute 2009. © European Broadcasting Union 2009. © European Broadcasting Union 2009. All rights reserved.
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ETSI ETSI EN 302 755 V1.1.1 (2009-09) 3 Contents Intellectual Property Rights . 7 Foreword . 7 1 Scope . 8 2 References . 8 2.1 Normative references . 8 2.2 Informative references . 9 3 Definitions, symbols and abbreviations . 9 3.1 Definitions . 9 3.2 Symbols . 12 3.3 Abbreviations . 15 4 DVB-T2 System architecture . 17 4.1 System overview . 17 4.2 System architecture . 18 4.3 Target performance . 20 5 Input processing . 21 5.1 Mode adaptation . 21 5.1.1 Input Formats . 21 5.1.2 Input Interface . 22 5.1.3 Input Stream Synchronization (Optional) . 22 5.1.4 Compensating Delay for Transport Streams . 22 5.1.5 Null Packet Deletion (optional, for TS only, NM and HEM) . 23 5.1.6 CRC-8 encoding (for GFPS and TS, NM only) . 23 5.1.7 Baseband Header (BBHEADER) insertion . 24 5.1.8 Mode adaptation sub-system output stream formats . 25 5.2 Stream adaptation . 28 5.2.1 Scheduler . 29 5.2.2 Padding . 29 5.2.3 Use of the padding field for in-band signalling . 29 5.2.4 BB scrambling . 32 6 Bit-interleaved coding and modulation . 32 6.1 FEC encoding . 32 6.1.1 Outer encoding (BCH) . 33 6.1.2 Inner encoding (LDPC) . 35 6.1.2.1 Inner coding for normal FECFRAME. 35 6.1.2.2 Inner coding for short FECFRAME . 36 6.1.3 Bit Interleaver (for 16-QAM, 64-QAM and 256-QAM). 37 6.2 Mapping bits onto constellations . 38 6.2.1 Bit to cell word de-multiplexer . 39 6.2.2 Cell word mapping into I/Q constellations . 42 6.3 Constellation Rotation and Cyclic Q Delay . 46 6.4 Cell Interleaver . 46 6.5 Time Interleaver . 48 6.5.1 Mapping of Interleaving Frames onto one or more T2-frames . 50 6.5.2 Division of Interleaving frames into Time Interleaving Blocks. 50 6.5.3 Interleaving of each TI-block. 51 6.5.4 Using the three Time Interleaving options with sub-slicing . 53 7 Generation, coding and modulation of Layer 1 signalling . 55 7.1 Introduction . 55 7.2 L1 signalling data . 56 7.2.1 P1 Signalling data . 56 7.2.2 L1-Pre Signalling data . 58 7.2.3 L1-post signalling data . 61 SIST EN 302 755 V1.1.1:2009
ETSI ETSI EN 302 755 V1.1.1 (2009-09) 4 7.2.3.1 Configurable L1-post signalling . 62 7.2.3.2 Dynamic L1-post signalling . 66 7.2.3.3 Repetition of L1-post dynamic data . 67 7.2.3.4 L1-post extension field . 68 7.2.3.5 CRC for the L1-post signalling . 68 7.2.3.6 L1 padding . 68 7.3 Modulation and error correction coding of the L1 data . 68 7.3.1 Overview . 68 7.3.1.1 Error correction coding and modulation of the L1-pre signalling . 68 7.3.1.2 Error correction coding and modulation of the L1-post signalling . 69 7.3.2 FEC Encoding . 70 7.3.2.1 Zero padding of BCH information bits . 70 7.3.2.2 BCH encoding . 72 7.3.2.3 LDPC encoding . 72 7.3.2.4 Puncturing of LDPC parity bits . 72 7.3.2.5 Removal of zero padding bits. 73 7.3.2.6 Bit interleaving for L1-post signalling . 74 7.3.3 Mapping bits onto constellations . 74 7.3.3.1 Demultiplexing of L1-post signalling . 74 7.3.3.2 Mapping into I/Q constellations . 75 8 Frame Builder . 75 8.1 Frame structure . 75 8.2 Super-frame . 76 8.3 T2-Frame . 77 8.3.1 Duration of the T2-Frame . 77 8.3.2 Capacity and structure of the T2-frame . 78 8.3.3 Signalling of the T2-frame structure and PLPs . 81 8.3.4 Overview of the T2-frame mapping . 81 8.3.5 Mapping of L1 signalling information to P2 symbol(s) . 82 8.3.6 Mapping the PLPs . 84 8.3.6.1 Allocating the cells of the Interleaving Frames to the T2-Frames . 84 8.3.6.2 Addressing of OFDM cells for common PLPs and data PLPs . 85 8.3.6.3 Mapping the PLPs to the data cell addresses. 86 8.3.6.3.1 Mapping the Common and Type 1 PLPs . 86 8.3.6.3.2 Mapping the Type 2 PLPs . 87 8.3.7 Auxiliary stream insertion . 88 8.3.8 Dummy cell insertion. 89 8.3.9 Insertion of unmodulated cells in the Frame Closing Symbol . 89 8.4 Future Extension Frames (FEF) . 89 8.5 Frequency interleaver . 90 9 OFDM Generation . 94 9.1 MISO Processing . 95 9.2 Pilot insertion . 95 9.2.1 Introduction. 95 9.2.2 Definition of the reference sequence . 96 9.2.2.1 Symbol level . 97 9.2.2.2 Frame level . 97 9.2.3 Scattered pilot insertion . 98 9.2.3.1 Locations of the scattered pilots . 98 9.2.3.2 Amplitudes of the scattered pilots . 99 9.2.3.3 Modulation of the scattered pilots . 100 9.2.4 Continual pilot insertion . 100 9.2.4.1 Locations of the continual pilots . 100 9.2.4.2 Locations of additional continual pilots in extended carrier mode . 100 9.2.4.3 Amplitudes of the Continual Pilots . 100 9.2.4.4 Modulation of the Continual Pilots . 101 9.2.5 Edge pilot insertion . 101 9.2.6 P2 pilot insertion . 101 9.2.6.1 Locations of the P2 pilots . 101 9.2.6.2 Amplitudes of the P2 pilots . 101 SIST EN 302 755 V1.1.1:2009
ETSI ETSI EN 302 755 V1.1.1 (2009-09) 5 9.2.6.3 Modulation of the P2 pilots . 101 9.2.7 Insertion of frame closing pilots . 102 9.2.7.1 Locations of the frame closing pilots . 102 9.2.7.2 Amplitudes of the frame closing pilots . 102 9.2.7.3 Modulation of the frame closing pilots . 102 9.2.8 Modification of the pilots for MISO . 102 9.3 Dummy tone reservation . 104 9.4 Mapping of data cells to OFDM carriers . 104 9.5 IFFT - OFDM Modulation . 104 9.6 PAPR Reduction . 106 9.6.1 Active Constellation Extension. 106 9.6.2 PAPR reduction using tone reservation . 108 9.6.2.1 Algorithm of PAPR reduction using tone reservation . 109 9.7 Guard interval insertion . 110 9.8 P1 Symbol insertion . 110 9.8.1 P1 Symbol overview . 110 9.8.2 P1 Symbol description . 110 9.8.2.1 Carrier Distribution in P1 symbol . 111 9.8.2.2 Modulation of the Active Carriers in P1 . 112 9.8.2.3 Boosting of the Active Carriers . 114 9.8.2.4 Generation of the time domain P1 signal . 114 9.8.2.4.1 Generation of the main part of the P1 signal . 114 9.8.2.4.2 Frequency Shifted repetition in Guard Intervals . 115 10 Spectrum characteristics . 115 Annex A (normative): Addresses of parity bit accumulators for Nldpc = 64 800 . 117 Annex B (normative): Addresses of parity bit accumulators for Nldpc = 16 200 . 124 Annex C (normative): Additional Mode Adaptation tools . 126 C.1 Input stream synchronizer . 126 C.1.1 Receiver Buffer Model . 128 Annex D (normative): Splitting of input MPEG-2 TSs into the data PLPs and common PLP of a group of PLPs . 130 D.1 Overview . 130 D.2 Splitting of input TS into a TSPS stream and a TSPSC stream . 131 D.2.1 General . 131 D.2.2 TS packets carrying any other type of content than Service Description Table (SDT) or Event Information Table (EIT), i.e. with PID values not equal to 0x0011 or 0x0012 . 132 D.2.3 TS packets carrying Service Description Table (SDT), i.e. with PID=0x0011 . 132 D.2.4 TS packets carrying Event Information Table (EIT), i.e. with PID=0x0012. 133 D.2.4.1 Required operations . 134 D.2.4.2 Conditions . 134 D.3 Receiver Implementation Considerations. 136 Annex E (informative): T2-frame structure for Time-Frequency Slicing . 137 E.1 General . 137 E.2 T2-frame structure . 138 E.2.1 Duration and capacity of the T2-frame. 138 E.2.2 Overall structure of the T2-frame . 138 E.2.3 Structure of the Type-2 part of the T2-frame . 139 E.2.4 Restrictions on frame structure to allow tuner switching time . 140 E.2.5 Signalling of the dynamic parameters in a TFS configuration . 141 E.2.6 Indexing of RF channels . 141 E.2.7 Mapping the PLPs . 142 E.2.7.1 Mapping the Common and Type 1 PLPs . 142 SIST EN 302 755 V1.1.1:2009
ETSI ETSI EN 302 755 V1.1.1 (2009-09) 6 E.2.7.2 Mapping the Type 2 PLPs . 142 E.2.7.2.1 Allocating the cells of the Interleaving Frame to the T2-Frames . 142 E.2.7.2.2 Size of the sub-slices . 143 E.2.7.2.3 Allocation of cell addresses to the sub-slices on RFstart . 144 E.2.7.2.4 Allocation of cell addresses to the sub-slices on the other RF channels . 144 E.2.7.2.5 Mapping the PLP cells to the allocated cell addresses . 146 E.2.8 Auxiliary streams and dummy cells . 146 Annex F (normative): Calculation of the CRC word . 147 Annex G (normative): Locations of the continual pilots . 148 Annex H (normative): Reserved carrier indices for PAPR reduction . 153 Annex I (informative): Transport Stream regeneration and clock recovery using ISCR . 155 Annex J (informative): Pilot patterns . 156 Annex K (informative): Allowable sub-slicing values . 164 Annex L (informative): Bibliography .
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