1、 Recommendation ITU-R BT.1877-1(08/2012)Error-correction, data framing, modulation and emission methods for second generation of digital terrestrialtelevision broadcasting systemsBT SeriesBroadcasting service(television)ii Rec. ITU-R BT.1877-1 Foreword The role of the Radiocommunication Sector is to
2、 ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy function
3、s of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenc
4、ed in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-
5、R patent information database can also be found. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting servi
6、ce (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and
7、fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 201
8、2 ITU 2012 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R BT.1877-1 1 RECOMMENDATION ITU-R BT.1877-1 Error-correction, data framing, modulation and emission methods for second generation of digital terrestria
9、l television broadcasting systems (Question ITU-R 132-2/6) (2010-2012) Scope This Recommendation defines error-correction, data framing, modulation and emission methods for the second generation of digital terrestrial television broadcasting transmission systems1(referred to, outside ITU-R, as a DVB
10、-T2 system). These systems have been developed such that they are compatible with the provisions of the GE06 Agreement. This Recommendation is intended for the digital terrestrial broadcasting transmission system, when high flexibility in the system configuration and broadcasting interactivity is of
11、 importance allowing for a wide-ranging trade-off between operation under minimal C/N levels or maximum transmission capacity2. The ITU Radiocommunication Assembly, considering a) that the digital terrestrial television systems for use in broadcasting systems have been developed in Recommendation IT
12、U-R BT.1306, which are referred to as the current systems; b) that digital terrestrial television broadcasting (DTTB) is being introduced in the VHF/UHF bands by some administrations from 1997; c) that it may be desirable to support the simultaneous transmission of a hierarchy of nested quality leve
13、ls (including low definition television (LDTV), high definition television (HDTV) and standard definition TV (SDTV) within a single channel; d) that many types of interference, including co-channel and adjacent channel, ignition noise, multipath and other signal distortions exist in the VHF/UHF band
14、s; e) that it is necessary that the frame synchronization be capable of robustness in channels subject to transmission errors; f) that it is desirable that the frame structure be adapted to different bit rate channels; g) that recent developments in the field of channel coding and modulation have pr
15、oduced new techniques with performances approaching the Shannon limit; 1The second generation of digital terrestrial television broadcasting transmission systems in this Recommendation is meant as systems offering higher bit rate capacity per Hz and better power efficiency in comparison to the syste
16、ms described in Recommendation ITU-R BT.1306, and there is no general requirement for backward compatibility with first-generation systems. 2For the first-generation systems information on planning parameters, protection ratios, etc. is already contained in relevant ITU-R Recommendations. For the se
17、cond-generation systems, there is a need to study and include such information in the relevant ITU-R Recommendations. 2 Rec. ITU-R BT.1877-1 h) that these new digital techniques would offer better spectrum and/or power efficiency, in comparison to the current systems, whilst maintaining the possibil
18、ity to be flexibly configured to cope with the specific broadcasting bandwidth and power resources; j) that the recommended system makes use of such techniques and thus allows for a wide-ranging trade-off between operation under minimal C/N levels or maximum transmission capacity; k) that the recomm
19、ended system would be capable to handle the variety of advanced audiovisual formats currently available and under definition; l) that the selection of a modulation option needs to be based on specific conditions such as spectrum resource, policy, coverage requirements, existing network structure, re
20、ception conditions, type of service required, cost to the consumer and broadcasters, recommends 1 that administrations wishing to introduce the second generation of DTTB systems may use the system outlined in Annex 1. Annex 1 Currently two variants of the system are considered (referred to, outside
21、ITU-R, as a DVB-T2 system) for fixed and mobile reception of SDTV and HDTV services (referred to as the T2-Base profile or simply DVB-T2) and for reception by very low capacity applications such as mobile broadcasting (referred to as the T2-Lite profile). T2-Lite signals may also be received by conv
22、entional stationary DVB-T2 receivers. Table 1 provides general data about the second-generation multi-carrier system with multiple physical layer pipes (PLP) covering both profiles. Footnotes 9-13 to Table 1 contain information on restrictions with respect to the T2-Base and T2-Lite profiles. Specif
23、ications and implementation guidelines for both profiles of this system are found in Appendix 1. Rec. ITU-R BT.1877-1 3 TABLE 1 Parameters for the second generation of DTTB transmission system Second-generation multi-carrier system with multiple physical layer pipes (PLP)(1)No. Parameters 1.7 MHz mu
24、lti-carrier (OFDM)(2)5 MHz multi-carrier(OFDM)(2)6 MHz multi-carrier(OFDM) 7 MHz multi-carrier (OFDM) 8 MHz multi-carrier (OFDM) 10 MHz multi-carrier (OFDM)(2)1 Used bandwidth 1.54 MHz in normal mode 4.76 MHz in normal mode 4.82 MHz in extended mode (8k mode) 4.86 MHz in extended mode (16k and 32k m
25、ode) 5.71 MHz in normal mode 5.79 MHz in extended mode (8k mode) 5.83 MHz in extended mode (16k and 32k mode) 6.66 MHz in normal mode 6.75 MHz in extended mode (8k mode) 6.80 MHz in extended mode (16k and 32k mode) 7.61 MHz in normal mode 7.72 MHz in extended mode (8k mode) 7.77 MHz in extended mode
26、 (16k and 32k mode) 9.51 MHz in normal mode 9.65 MHz in extended mode (8k mode) 9.71 MHz in extended mode (16k and 32k mode) 2 Number of radiated carriers 1k mode(10)853 853 853 853 853 853 2k mode 1 705 1 705 1 705 1 705 1 705 1 705 4k mode 3 409 3 409 3 409 3 409 3 409 3 409 8k mode 6 817 (8k mode
27、) 6 817 (8k mode) 6 913 (8k extended mode) 6 817 (normal mode)6 913 (extended mode) 6 817 (normal mode)6 913 (extended mode)6 817 (normal mode)6 913 (extended mode)6 817 (8k mode) 6 913 (8k extended mode) 16k mode 13 633 (16k mode) 13 921 (16k extended mode) 13 633 (normal mode)13 921 (extended mode
28、) 13 633 (normal mode)13 921 (extended mode)13 633 (normal mode)13 921 (extended mode)13 633 (16k mode) 13 921 (16k extended mode) 32k mode(10)27 265 (32k mode) 27 841 (32k extended mode) 27 265 (normal mode)27 841 (extended mode) 27 265 (normal mode)27 841 (extended mode)27 265 (normal mode)27 841
29、(extended mode)27 265 (32k mode) 27 841 (32k extended mode) 3 Modulation modes Constant coding and modulation (CCM)/variable coding and modulation (VCM) 4 Rec. ITU-R BT.1877-1 TABLE 1 (continued) No. Parameters 1.7 MHz multi-carrier (OFDM)(2)5 MHz multi-carrier(OFDM)(2)6 MHz multi-carrier(OFDM) 7 MH
30、z multi-carrier (OFDM) 8 MHz multi-carrier (OFDM) 10 MHz multi-carrier (OFDM)(2)4 Modulation method QPSK, 16-QAM, 64-QAM, 256-QAM specific for each physical layer pipe 5 Channel occupancy To be defined (2)See Rec. ITU-R BT.1206 To be defined (2)6 Active symbol duration 1k mode(10)554.99 s 179.2 s 14
31、9.33 s 128 s 112 s 89.60 s 2k mode 1 109.98 s 358.4 s 298.67 s 256 s 224 s 179.20 s 4k mode 2 219.97 s 716.8 s 597.33 s 512 s 448 s 358.40 s 8k mode 4 439.94 s 1 433.6 s 1 194.67 s 1 024 s 896 s 716.8 s 16k mode 2 867.2 s 2 389.33 s 2 048 s 1 792 s 1 433.6 s 32k mode(10)5 734.40 s 4 778.67 s 4 096 s
32、 3 584 s 2 867.2 s 7 Carrier spacing 1k mode(10)1 801.91 Hz 5 580.63 Hz 6 696.75 Hz 7 812.88 Hz 8 929 Hz 11 161.25 Hz 2k mode 900.86 Hz 2 790 Hz 3 348 Hz 3 906 Hz 4 464 Hz 5 580.00 Hz 4k mode 450.43 Hz 1 395 Hz 1 674 Hz 1 953 Hz 2 232 Hz 2 790.00 Hz 8k mode 225.21 Hz 697.50 Hz 837 Hz 976 Hz 1 116 Hz
33、 1 395.00 Hz 16k mode 348.75 Hz 418.5 Hz 488.25 Hz 558 Hz 697.50 Hz 32k mode(10)174.38 Hz 209.25 Hz 244.125 Hz 279 Hz 348.75 Hz Rec. ITU-R BT.1877-1 5 TABLE 1 (continued) No. Parameters 1.7 MHz multi-carrier (OFDM)(2)5 MHz multi-carrier(OFDM)(2)6 MHz multi-carrier(OFDM) 7 MHz multi-carrier (OFDM) 8
34、MHz multi-carrier (OFDM) 10 MHz multi-carrier (OFDM)(2)8 Guard interval duration (3)1/128, 1/32, 1/16, 19/256, 1/8, 19/128, 1/4 of active symbol duration 1/128, 1/32, 1/16, 19/256, 1/8, 19/128, 1/4 of active symbol duration 1/128, 1/32, 1/16, 19/256, 1/8, 19/128, 1/4 of active symbol duration 1/128,
35、 1/32, 1/16, 19/256, 1/8, 19/128, 1/4 of active symbol duration 1/128, 1/32, 1/16, 19/256, 1/8, 19/128, 1/4 of active symbol duration 1/128, 1/32, 1/16, 19/256, 1/8, 19/128, 1/4 of active symbol duration 1k mode(10)34.69, 69.37, 138.75 s 11.2, 22.4, 44.8 s 9.3, 18.6, 37.3 s 8, 16, 32 s 7, 14, 28 s 5
36、.6, 11.2, 22.4 s 2k mode 34.69, 69.37, 138.75, 277.50 s 11.2, 22.4, 44.8, 89.6 s 9.3, 18.6, 37.3, 74.6 s 8, 16, 32, 64 s 7, 14, 28, 56 s 5.6, 11.2, 22.4, 44.8 s 4k mode 69.37, 138.75, 277.50, 554.99 s 22.4, 44.8, 89.6, 179.2 s 18.6, 37.3, 74.6, 149.3 s 16, 32, 64, 128 s 14, 28, 56, 112 s 11.2, 22.4,
37、 44.8, 89.6 s 8k mode 34.69, 138.75, 277.50, 329.53, 554.99, 659.05, 1 109.98 s 11.2, 44.8, 89.6, 106.4, 179.2, 212.8, 358.4 s 9.3, 37.3, 74.6, 88.6, 149.3, 177.3, 298.6 s 8, 32, 64, 75.9, 128, 152, 256 s 7, 28, 56, 66.5, 112, 133, 224 s 5.6, 22.4, 44.8, 53.2, 89.6, 106.4, 179.2 s 16k mode 22.4, 89.
38、6, 179.2, 212.8, 358.4, 425.6, 716.8 s 18.6, 74.6, 149.3, 177.3, 298.6, 354.6, 597.3 s 16, 64, 128, 152, 256, 304, 512 s 14, 56, 112, 133, 224, 266, 448 s 11.2, 44.8, 89.6, 106.4, 179.2, 212.8, 358.4 s 32k mode(10)44.8, 179.2, 358.4, 425.6, 716.8, 851.2 s 37.33, 149.33, 298.67, 354.67, 597.33, 709.3
39、3 s 32, 128, 256, 304, 512, 608 s 28, 112, 224, 266, 448, 532 s 22.4, 89.6, 179.2, 212.8, 358.4, 425.6 s 9 Overall symbol duration 1k mode(10)589.68-4578.69 s 190.4, 201.6, 224 s 158.6, 168, 186.6 s 136, 144, 160 s 119, 126, 140 s 95.20-112.00 s 2k mode 1 144.67-1 387.48 s 369.6, 381, 403, 448 s 308
40、, 317, 336, 373.3 s 264, 272, 288, 320 s 231, 238, 252, 280 s 184.80-224.00 s 4k mode 2 289.34-2 774.96 s 739, 762, 806, 896 s 616, 635, 672, 746.6 s 527.9, 544, 576, 640 s 462, 476, 504, 560 s 369.60-448.00 s 8k mode 4 474.63-5 549.92 s 1 444.8, 1 478.4, 1 523.2, 1 540, 1 612.8, 1 646.4, 1 792 s 1
41、204, 1 232, 1 269.3, 1 283.3, 1 344, 1 372, 1 493.3 s 1 032, 1 056, 1 088, 1 100, 1 152, 1 176, 1 280 s 903, 924, 952, 962.5, 1 008, 1 29, 1 120 s 722.4, 739.2, 761.6, 770, 806.4, 823, 896 s 16k mode 2 889, 2 956.8, 3 046.4, 3 080, 3 225.6, 3 292.8, 3 584 s 2 408, 2 464, 2 538.6, 2 566.6, 2 686, 2 7
42、44, 2 986.6 s 2 064, 2 112, 2 176, 2 200, 2 304, 2 352, 2 560 s 1 806, 1 848, 1 904, 1 925, 2 016, 2 058, 2 240 s 1 444.8, 1 478.4, 1 523.2, 1 540, 1 612.8, 1 646.4, 1 792 s 32k mode(10)5 779.20-6 585.60 s 4 816-5 488 s 4 128-4 704 s 3 612, 3 696, 3 808, 3 850, 4 032, 4 116 s 2 889.6, 2 956.8, 3 046
43、.4, 3 080, 3 225.6, 3 292.8 s 6 Rec. ITU-R BT.1877-1 TABLE 1 (continued) No. Parameters 1.7 MHz multi-carrier (OFDM)(2)5 MHz multi- carrier (OFDM)(2)6 MHz multi-carrier(OFDM) 7 MHz multi-carrier (OFDM) 8 MHz multi-carrier (OFDM) 10 MHz multi-carrier (OFDM)(2)10 Transmission frame duration(6)Frame st
44、arts with preamble and has a configurable number of symbols, with maximum duration of 250 ms. Minimum number of data symbols is 3 (32k mode) or 7 (other modes). Super-frame length is configurable, maximum 256 frames, 64 s 11 Input stream format(4)Either transport streams (TS) or generic streams (GS)
45、 12 System stream format BB format(5)BB format 13 Mode adaptation code CRC-8 14 Channel coding(9)LDPC/BCH code with block size of 64 800 (64 K)(10)or 16 200 (16 K) bits and code rates 1/3(9), 2/5(9), 4/9, 1/2, 3/5, 2/3, 11/15, 3/4(10), 4/5(10), 37/45(10), 5/6(10)15 Interleaving Bit, cell and time in
46、terleaving separately for each physical layer pipe. Common frequency interleaving(1)16 Constellation rotation None, 29 (QPSK), 16.8 (16-QAM), 8.6 (64-QAM) degrees or atn (1/16) (256-QAM)(10)17 Physical layer pipes (PLP) Mode A with single PLP and mode B with multiple PLPs. Modulation, coding and tim
47、e interleaving depth selectable separately for each PLP(1) (7)18 Data randomization/ energy dispersal PRBS Initial scan Fast scan process with special preamble symbol P1 19 Time/frequency synchronization Preamble symbols P1 and P2. Scattered pilot carriers with 8 different pilot patterns available(1
48、3). Continual pilots 20 MISO An optional 2 1 Multiple Input Single Output (MISO) with Alamouti coding 21 Receiver power consumption reduction Physical layer pipes are organized as subslices in the frame. When receiving a single PLP only the preamble and relevant subslices are received and processed
49、22 Layer 1 signalling L1 signalling is carried by P2 symbols in the preamble. L1 pre-signalling is modulated with BPSK and coded with 1/4 16k LDPC. L1 post-signalling has configurable modulation and 1/2 16k LDPC coding. Option for in-band signalling within the PLP 23 Layer 1 signalling Either within the data PLPs or with special common PLP at the beginning of the frame Rec. ITU-R BT.1877-1 7 TABLE 1 (end) No. Parameters 1.7 MHz multi-carrier (OFDM)(2)5 MHz multi- carrier (OFDM)(2)6 M
