ETSI EN 302 769-2015 Digital Video Broadcasting (DVB) Frame structure channel coding and modulation for a second generation digital transmission system for cable systems (DVB-C2) (.pdf

1、 ETSI EN 302 769 V1.3.1 (2015-10) Digital Video Broadcasting (DVB); Frame structure channel coding and modulation for a second generation digital transmission system for cable systems (DVB-C2) EUROPEAN STANDARD ETSI ETSI EN 302 769 V1.3.1 (2015-10) 2 Reference REN/JTC-DVB-353 Keywords audio, broadca

2、sting, cable, data, digital, DVB, MPEG, 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 but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important noti

3、ce 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 authoriza

4、tion 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 a

5、ware 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:

6、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 no

7、t 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. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trad

8、e 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. ETSI ETSI EN 302 769 V1.3.1 (2015-10)

9、 3 Contents Intellectual Property Rights 6g3Foreword . 6g3Modal verbs terminology 6g3Introduction 7g31 Scope 8g32 References 8g32.1 Normative references . 8g32.2 Informative references 8g33 Definitions, symbols and abbreviations . 9g33.1 Definitions 9g33.2 Symbols 11g33.3 Abbreviations . 14g34 DVB-C

10、2 System architecture . 16g34.1 System overview 16g34.2 System architecture 16g34.3 Target performance 19g35 Input processing . 19g35.1 Mode adaptation . 19g35.1.0 Overview 19g35.1.1 Input Formats 20g35.1.2 Input Interface. 20g35.1.3 Input Stream Synchronization (Optional) . 21g35.1.4 Null Packet De

11、letion (optional, for TS only, NM and HEM) . 21g35.1.5 CRC-8 encoding (for GFPS and TS, NM only) 22g35.1.6 Baseband Header (BBHeader) insertion . 22g35.1.7 Mode adaptation sub-system output stream formats . 24g35.2 Stream adaptation . 27g35.2.0 Overview 27g35.2.1 Scheduler 27g35.2.2 Padding . 27g35.

12、2.3 BB scrambling 27g36 Bit-interleaved coding and modulation 28g36.1 FEC encoding . 28g36.1.0 Overview 28g36.1.1 Outer encoding (BCH) 29g36.1.2 Inner encoding (LDPC) 30g36.1.2.0 Overview . 30g36.1.2.1 Inner coding for normal FECFrame 30g36.1.2.2 Inner coding for short FECFrame . 32g36.1.3 Bit Inter

13、leaver . 32g36.2 Mapping bits onto constellations 34g36.2.0 Overview 34g36.2.1 Bit to cell word demultiplexer 35g36.2.2 Cell word mapping into I/Q constellations . 38g37 Data Slice Packet Generation . 45g37.0 Overview 45g37.1 Data Slice Packets for Data Slice Type 1 . 45g37.2 Data Slice Packets for

14、Data Slice Type 2 . 45g37.2.0 Overview 45g37.2.1 FECFrame header signalling data . 46g37.2.2 Coding of the FECFrame header 47g37.2.2.0 Overview . 47g3ETSI ETSI EN 302 769 V1.3.1 (2015-10) 4 7.2.2.1 Error Coding . 48g37.2.2.2 Cyclic Delay 48g37.2.2.3 Scrambling of the lower branch 48g37.2.3 Mapping o

15、nto QAM constellations . 49g37.2.3.0 Overview . 49g37.2.3.1 Robust FECFrame header . 49g37.2.3.2 High efficiency FECFrame header 49g37.2.4 Mapping of the XFECFrame cells 49g37.2.5 Length of the Data Slice Packet for Data Slice Type 2 . 49g37.2.6 Stuffing Data Slice Packets . 50g38 Generation, coding

16、 and modulation of Layer 1 part 2 signalling . 51g38.1 Overview 51g38.2 Preamble Header 51g38.3 L1 signalling part 2 data . 53g38.3.0 Overview 53g38.3.1 L1 block padding 58g38.3.2 CRC for the L1 signalling part 2. 58g38.3.3 L1 padding 58g38.4 Modulation and error correction coding of the L1 part 2 d

17、ata 59g38.4.1 Overview 59g38.4.2 Parameters for FEC encoding of L1 part 2 data 61g38.4.3 FEC Encoding . 63g38.4.3.1 Zero padding of BCH information bits . 63g38.4.3.2 BCH encoding . 64g38.4.3.3 LDPC encoding . 64g38.4.3.4 Puncturing of LDPC parity bits . 65g38.4.3.5 Removal of zero padding bits 65g3

18、8.4.3.6 Bit interleaving for L1 signalling part 2 66g38.4.4 Mapping bits onto constellations 66g38.4.4.0 Overview . 66g38.4.4.1 Demultiplexing of L1 signalling part 2 . 66g38.4.4.2 Mapping onto QAM constellations . 67g38.5 Time interleaving of L1 signalling part 2 data . 67g39 Frame Builder . 69g39.

19、0 Introduction 69g39.1 C2 Frame structure . 69g39.1.0 Overview 69g39.1.1 Duration of the C2 Frame . 70g39.2 Pilot Reference Sequence . 70g39.2.1 Data Scrambling Sequence . 70g39.2.2 Pilot Scrambling Sequence . 70g39.2.3 Pilot Reference Sequence . 71g39.3 Preamble Symbol . 71g39.3.1 Preamble Symbol o

20、verview 71g39.3.2 Frequency Interleaving . 72g39.3.3 Pilot insertion 72g39.3.3.0 Overview . 72g39.3.3.1 Locations of the preamble pilots . 73g39.3.3.2 Amplitude and modulation of the preamble pilots 73g39.3.4 Mapping and scrambling of the signalling data 73g39.3.5 Notches within Preamble Symbols . 7

21、4g39.3.5.0 Overview . 74g39.3.5.1 Narrowband Notches . 74g39.3.5.2 Broadband Notches . 74g39.4 Data Slice generation 75g39.4.0 Overview 75g39.4.1 Location of Data Slices . 75g39.4.1.1 Start and end OFDM carrier of Data Slices 75g39.4.1.2 Maximum width of Data Slices . 75g39.4.1.3 Minimum width of Da

22、ta Slices . 75g3ETSI ETSI EN 302 769 V1.3.1 (2015-10) 5 9.4.1.4 Notches within Data Slices . 75g39.4.2 Number of payload cells in Data Slice 76g39.4.3 Mapping of the Data Slice Packets . 76g39.4.4 Time Interleaving 76g39.4.5 Frequency Interleaving . 80g39.5 Stuffing Data Slices 81g39.6 Pilot Inserti

23、on . 81g39.6.1 Introduction. 81g39.6.2 Scattered pilot insertion 82g39.6.2.0 Overview . 82g39.6.2.1 Locations of the scattered pilots 82g39.6.2.2 Amplitudes of the scattered pilots . 82g39.6.2.3 Modulation of the scattered pilots . 82g39.6.3 Continual pilot insertion . 83g39.6.3.0 Overview . 83g39.6

24、.3.1 Locations of the continual pilots . 83g39.6.3.2 Amplitudes of the Continual Pilots . 83g39.6.3.3 Modulation of the Continual Pilots . 83g39.6.4 Edge pilot insertion . 83g39.6.4.0 Overview . 83g39.6.4.1 Locations of the edge pilots 83g39.6.4.2 Amplitudes of the Edge Pilots . 84g39.6.4.3 Modulati

25、on of the Edge Pilots . 84g39.7 Dummy carrier reservation . 85g310 OFDM generation 85g310.0 Introduction 85g310.1 IFFT - OFDM Modulation . 85g310.2 Guard interval insertion 87g310.3 Spectrum characteristics . 87g3Annex A (normative): Addresses of parity bit accumulators for Nldpc = 64 800 89g3Annex

26、B (normative): Addresses of parity bit accumulators for Nldpc = 16 200 . 95g3Annex C (normative): Input stream synchronizer 97g3Annex D (normative): Input Remultiplexing Subsystem: Splitting of input MPEG-2 Transport Streams into Data PLPs, generation of a Common PLP of a group of PLPs and insertion

27、 of Null Packets into Transport Streams . 99g3D.1 Overview 99g3D.2 Splitting of a group of input TSs into TSPSs streams and a TSPSC stream 100g3D.2.1 General . 100g3D.2.2 Extraction of the Common PLP from a group of TS 100g3D.2.3 Insertion of additional Null Packets into TSPSs. 101g3D.3 Receiver Imp

28、lementation Considerations. 102g3D.3.0 Introduction 102g3D.3.1 Recombination of TSPSS and TSPSC in a receiver . 102g3Annex E (normative): Calculation of the CRC word 104g3Annex F (normative): Bundling of PLPs 105g3Annex G (informative): Transport Stream regeneration and clock recovery using ISCR 107

29、g3Annex H (informative): Pilot patterns 108g3Annex I (informative): Bibliography 111g3History 112g3ETSI ETSI EN 302 769 V1.3.1 (2015-10) 6 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these

30、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 up

31、dates 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 serv

32、er) 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), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecom

33、munications 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 al

34、so 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. Th

35、e 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 consort

36、ium 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 circumstance

37、s of broadcast industry stakeholders and consumers. DVB standards cover all aspects of digital television from transmission through interfacing, conditional access and interactivity for digital video, audio and data. The consortium came together in 1993 to provide global standardization, interoperab

38、ility and future proof specifications. National transposition dates Date of adoption of this EN: 22 October 2015 Date of latest announcement of this EN (doa): 31 January 2016 Date of latest publication of new National Standard or endorsement of this EN (dop/e): 31 July 2016 Date of withdrawal of any

39、 conflicting National Standard (dow): 31 January 2019 Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for

40、the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI EN 302 769 V1.3.1 (2015-10) 7 Introduction Since 1994 enhanced digital transmission technologies have evolved somewhat: New channel coding schemes, combined with h

41、igher order modulation, promise more powerful alternatives to the DVB-C coding and modulation schemes. The result is a capacity gain in the order of 30 % at a given cable channel bandwidth and CATV network performance. Variable Coding and Modulation (VCM) may be applied to provide different levels o

42、f error protection to different services (e.g. SDTV and HDTV, audio, multimedia). In the case of interactive and point-to-point applications, the VCM functionality may be combined with the use of return channels, to achieve Adaptive Coding and Modulation (ACM). This technique provides more exact cha

43、nnel protection and dynamic link adaptation to propagation conditions, targeting each individual receiving terminal. DVB-C is strictly focused on a unique data format, the MPEG Transport Stream (ISO/IEC 13818-1 i.1 or a reference to it). Extended flexibility to cope with other input data formats (su

44、ch as multiple Transport Streams, or generic data formats) is now possible without significant complexity increase. Version 1.2.1 of the present document defines a “second generation“ modulation and channel coding system (denoted the “C2 System“ or “DVB-C2“ for the purposes of the present document)

45、to make use of the improvements listed above. DVB-C2 is a single, very flexible standard, covering a variety of applications by cable, as described below. It is characterized by: a flexible input stream adapter, suitable for operation with single and multiple input streams of various formats (packet

46、ized or continuous); a powerful FEC system based on LDPC (Low-Density Parity Check) codes concatenated with BCH (Bose Chaudhuri Hocquenghem) codes, allowing Quasi Error Free operation close to the Shannon limit, depending on the transmission mode (AWGN channel, modulation constrained Shannon limit);

47、 a wide range of code rates (from 2/3 up to 9/10); 5 constellations, ranging in spectrum efficiency from 1 to 10,8 bit/s/Hz, optimized for operation in cable networks; Adaptive Coding and Modulation (ACM) functionality, optimizing channel coding and modulation on a frame-by-frame basis. DVB-C i.4 wa

48、s introduced as a European Norm in 1994. It specifies single carrier QAM modulation and Reed-Solomon channel coding and is used today by many cable operators worldwide for television and data broadcasting as well as for forward channel transmission of the Data Over Cable System defined in i.7. Versi

49、on 1.3.1 of this specification (the present document) made a number of clarifications and corrections to the wording. No changes have been made to existing features. Three new technical features have been added: Early Warning System signalling DVB-C2 version number Additional MODCOD 4/5 for 4096-QAM The new features are defined backward compatible. This means that receivers compliant to version 1.2.1 are not affected when receiving a 1.3.1 compliant signal, which does not include additional MODCOD 4/5 for 4096-QAM or extended PLP Bundling over