1、 STDBETSI EN 300 7LIB-ENGL L797 m 3400855 02L7b77 978 m EN 300 748 1.1.2 (1997-08) European Standard (Telecommunications series) Digital Video Broadcasting (DVB); Multipoint Video Distribution Systems (MVDS) at 10 GHz and above - STD-ETSI EN 300 748-ENGL 1997 m 3400855 02L7b98 824 m 2 EN 300 748 VI
2、.I .2 (1 997-08) Reference REN/JTC-OODVB-68 (6xCOOidc.PDF) Keywords DVB, digital, video, broadcasting, MPEG, TV, mu It i po int ETSI Secretariat Postai address F-O6921 Sophia Antipolis Cedex - FRANCE Office address 650 Route des Lucioles - Sophia Antipolis Vaibonne - FRANCE Siret No 348 623 562 0001
3、7 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) No 7803/88 Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 X.400 c= fr; a=atlas; p=etsi; ssecretariat Internet secretariat et!si.fr http:/www.etsi.fr Copyright Notification No part may be reproduced except as autho
4、rized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 1997. O European Broadcasting Union 1997. All rights reserved. STD-ETSI EN 300 748-ENGL 1997 D 3Li00855 UZL7b99 7b0 3 EN 300 748 V1.1.2 (1 9
5、97-08) Contents Intellectual Property Rights 4 Foreword 4 1 2 3 3.1 3.2 4 4.1 4.2 4.3 4.4 4.4.1 4.4.2 4.4.3 4.5 5 Scope 5 Normative references . 5 Symbols and abbreviations 6 Symbols . 6 Abbreviations . 6 Transmission system 7 System definition . 7 8 . 8 Channel coding 9 Transport multiplex adaptati
6、on and randomization for energy dispersal 9 Outer coding (Reed-Solomon), interleaving and framing 10 Inner coding (convolutional) 12 Baseband shaping and modulation . 13 nsmit ter characteristics Error performance requirements 14 Annex A (normative): Annex B (informative): Signal spectrum at the mod
7、ulator output . 15 Conceptual system description . 17 Annex C (informative): Examples of bit rates versus MVDS transmitter bandwidth 19 Annex D (informative): Examples of possible use of the System . 20 Annex E (informative): Bibliography . 21 History 22 STD.ETS1 EN 300 7LiB-ENGL 1997 3400855 021770
8、0 202 4 EN 300 748 Vl.1.2 (1997-08) 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 ET
9、R 3 14: “lntellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notifed to ETSI in respect of ETSI standards“, which is available free of charge from the ETSI Secretanat. Latest updates are available on the ETSI Web server (http:/www.etsi.fr/ipr). Pursuant to the ETSI Interim
10、 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 ETR 314 (or the updates on http:/www.etsi.fr/ipr) which are, or may be, or may become, essential to the present document. Foreword This s
11、econd edition, previously as an ETS now an EN, contains changes of an entirely editorial nature as follows: 1) add the DVB logo to the front page of the deliverable; 2) change the title from: “Digital broadcasting systems for television, sound and data services; etc.“ to 3) add in the foreword the D
12、VB acknowledgement. “Digital Video Broadcast (DVB); etc.“; This European Standard (Telecommunications series) has been produced by the Joint Technical Committee (JTC) of the European Broadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunicatio
13、ns Standards Institute (ETSI). NOTE: The EBUETSI JTC was established in 1990 to co-ordinate the drafting of standards in the specific field of broadcasting and related fields. Since 1995 the JTC became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is responsib
14、le 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 ab
15、out 60 countries in the European broadcasting area; its headquarters is in Geneva *. * European Broadcasting Union Case Postale 67 CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: a122717 21 11 Fax: +4122 717 24 81 Digital Video Broadcasting (DVB) Project Founded in September 1993, the DVB Project i
16、s a market-led consortium of public and private sector organizations in the television industry. Its aim is to establish the framework for the introduction of MPEG-2 based digital television services. Now comprising over 200 organizations from more than 25 countries around the world, DVB fosters mar
17、ket- led systems, which meet the real needs, and economic circumstances, of the consumer electronics and the broadcast industry. Proposed national transposition dates Date of adoption of this EN Date of latest announcement of this EN (doa): 18 October 1996 3 1 January 1997 Date of latest publication
18、 of new National Standard or endorsement of this EN (dop/e): 3 1 July 1997 Date of withdrawal of any conflicting National Standard (dow): 31 July 1997 5 EN 300 748 V1.1.2 (1 997-08) 1 Scope The present document describes the modulation and channel coding system (denoted the ”System” for the purposes
19、 of the present document) for the distribution of digital multi-programme Television (TV) / High Definition Television (HDTV) by Multipoint Video Distribution Systems (MVDS) in the 40 GHz band. The System described in the present document is based on that described in EN 300 421 for 11/12 GHz satell
20、ite services (see annex E, bibliography). It allows the same consumer Integrated Receiver Decoder (IRD) to be used for either service, when used with a Low Noise Block (LNB) down-converter for the appropriate ffequency band. The frequency band 405 to 42,5 GHz has been harmonized within the European
21、Conference of Post and Telecommunications Administrations (CEPT) under Recommendation T/R 52-01. The System however, is applicable to other frequency bands above 10 GHz. The System uses Quaternary Phase Shift Keying (QPSK) modulation and concatenated error protection strategy based on a convolutiona
22、l code and shortened Reed-Solomon (RS) code. The System is suitable for use on different MVDS transmitter bandwidths. Compatibility with Moving Pictures Experts Group - 2 (MPEG-2) coded TV services (see ISOIIEC 13818-1 i), with a transmission structure synchronous with the packet multiplex, is provi
23、ded. Exploitation of the multiplex flexibility allows the use of the transmission capacity for a variety of TV service configurations, including sound and data services. All service components are Time Division Multiplexed (TDM) on a single digital carrier. The present document: gives a general desc
24、ription of the System for MVDS digital TV transmission; specifies the digitally modulated signal in order to allow comp8tibility between pieces of equipment developed by different manufacturers. This is achieved by describing in detail the signal processing principles at the modulator side, while th
25、e processing at the receive side is left open to different implementation solutions. However, it is necessary in the present document to refer to certain aspects of reception; identifies the global performance requirements and features of the System, in order to meet the service quality target s. 2
26、Normative references References may be made to: a) specific versions of publications (identified by date of publication, edition number, version number, etc.), in which case, subsequent revisions to the referenced document do not apply; or b) all versions up to and including the identified version (
27、identified by “up to and including” before the version identity); or c) all versions subsequent to and including the identified version (identified by “onwards” following the version identity); or d) publications without mention of a specific version, in which case the latest version applies. A non-
28、specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number. U1 121 ISO/EC 13818-1 (November 1994): ”Coding of moving pictures and associated audio”. Forney, G.D. EEE Trans. Comm. Tech., COM-19, pp. 772-781, (October 1971): “Burst- correcting c
29、odes for the classic bursty channel“. Intelsat Earth Station Standards (ESS) No. 308, revision 6 (26 October 1990): “Performance Characteristics for Intermediate Data Rate (IDR) digital carriers”. Dl STD.ETSI EN 300 7Li-ENGL 1797 m 3Li00855 0217702 085 = 6 EN 300 748 V1.1.2 (1997-08) 3 Symbols and a
30、bbreviations 3.1 Symbols For the purposes of the present document, the following symbols apply: roll-off factor Signai -t o-Noi se rat io convolutional code free distance ratio between the energy per useful bit and twice the noise power spectral density Nyquist frequency convolutional code generator
31、s RS code generator polynomial Interleaving depth (bytes) In-phase, Quadrature phase components of the modulated signal branch index of the interleaver convolutional code constraint length convolutional interleaver branch depth for j = 1, M = N/I error protected frame length (bytes) RS field generat
32、or polynomial in-band ripple (dB) symbol Rate corresponding to the bilateral Nyquist bandwidth of the modulated signal useful bit Rate after MPEG-2 transport multiplexer bit rate after RS outer coder number of bytes which can be corrected in RS error protected packet symbol period di-bit stream afte
33、r rate 1/2 convolutional coding Abbreviations For the purposes of the present document, the following abbreviations apply: AWGN BB BER BSS BW CCT DTH FDM FEC FIFO FIR FSS HDTV HEX IF IMUX IRD MPEG MSB MUX MVDS OB0 OCT OMUX P PDH Additive White Gaussian Noise BaseBand Bit Error Ratio Broadcast Satell
34、ite Service Bandwidth International Telegraph and Telephone Consultative Committee (now ITU-T) Direct To Home Frequency Division Multiplex Forward Error Correction First-In, First-Out shift register Finite Impulse Response Fixed Satellite Service High Definition Television HEXadecimal notation Inter
35、mediate Frequency Input Multiplexer - filter Integrated Receiver Decoder Moving Pictures Experts Group Most Significant Bit Multiplex Multipoint Video Distribution System Output Back Off OCTal notation Output Multiplexer - filter Puncturing Plesiochronous Digital Hierarchy PRBS PS K QEF QPSK R RF RS
36、 SMATV TBD TDM TV TWTA STD.ETSI EN 300 748-ENGL 1997 9 3400855 0237703 TL1 7 EN 300 748 V1.1.2 (1997-08) Pseudo Random Binary Sequence Phase Shift Keying Quasi-Error-Free Quaternary PSK Randomized sequence Radio Frequency Reed-S olomon Satellite Master Antenna Television To Be Defined Time Division
37、Multiplex Television Travelling Wave Tube Amplifier 4 4.1 Transmission system System defini tio n The System is defined as the functional block of equipment performing the adaptation of the baseband TV signals from the output of the MPEG-2 transport multiplexer, to the MVDS channel characteristics.
38、The following processes shall be applied to the data stream (see figure 1): - - outer coding (i.e. Reed-Solomon); - convolutional interleaving: transport multiplex adaptation and randomization for energy dispersal; - - baseband shaping for modulation; - modulation. inner coding (Le. punctured convol
39、utional code); The System functional description is given in annex B. MVDS services at millimetric frequency bands are particularly affected by power limitations, therefore ruggedness against noise and interference shall be the main design objective, rather than spectrum efficiency. To achieve a ver
40、y high power efficiency without excessively penalizing the spectrum efficiency, the System shall use QPSK modulation and the concatenation of convolutional and RS codes. The convolutional code is able to be configured flexibly, allowing the optimization of the system performance for a given MVDS tra
41、nsmitter bandwidth (see annex C). The System is suitable for single carrier per MVDS transmitter Time Division Multiplex (TDM) type applications. The System can also be used for multicarrier Frequency Division Multiplex (FDM) type applications. 8 EN 300 748 Vl.1.2 (1997-08) Location Interface Interf
42、ace type Transmit station Input MPEG-2 transport multiplex Output 70/140 MHz IF output MPEG-2 Receive installation transport multiplex Input TBD U Adlo coder Connection from MPEG-2 multiplexer to RF devices demultiplexer from RF devices (indoor unit) to MPEG-2 SeM components WEG-2 Source coding and
43、multiplexing I- n SeMs - Her- leaver cala lo the RF MVDS Channel MVDS hnnel adapts Figure 1: Functlonal block diagram of the System The System is directly compatible with MPEG-2 coded TV signals. The modem transmission frame is synchronous with the MPEG-2 multiplex transport packets. If the received
44、 signal is above C/N and C/I threshold, the Forward Error Correction (FEC) technique adopted in the System is designed to provide a Quasi Error Free (QEF) quality target. The QEF means less than one uncorrected error-event per transmission hour, corresponding to Bit Error Ratio (BER) = 10 -lo to 10-
45、l at the input of the MPEG-2 demultiplexer. 4.2 Adaptation to MVDS transmitter characteristics MVDS transmitters of digital multi-programme TV services will use channels within band plans set according to individual countries planning and regulatory criteria and are required to provide compatibility
46、 with existing digital cable and satellite services. The MVDS transmitter performance specification and, in particular, its operating bandwidth will determine the data rates available to the service. The symbol rate shall be matched to given MVDS transmitter characteristics. Examples based on comput
47、er simulations for a hypothetical MVDS chain, not including interference effects, are given in annex C. 4.3 Interfacing The System, as defined in the present document, shall be delimited by the following interfaces given in table 1: 9 EN 300 748 V1 .1.2 (1997-08) 123 456 78 9 10 11 12 13 14 15 4.4 C
48、hannel coding ri( o o o o o o 1 1 I/ /I - R R / R 187 Bytes 187 Bytes 187 Bytes / I/ 748-ENGL 1997 D I/ - R / Sync 187 Bytes / 11 Syncl or Sync n 3400855 R RS(204,188,8) 187 Bytes 0237707 bb7 9 / - - - Sync1 203 Bytes or Syncl Syncl or 203 Bytes or EN 300 748 Vi .1.2 (1 997-08) II Sync n Sync n Figu
49、re 3a) MPEG-2 transport MUX packet Sync n 11 204 bytes Figure 3c) Reed-Solomon RS (204,188, T=8) error protected packet Figure 3d) Interleaved frames; interleaving depth 1=12 bytes - Syncl = not randomized complemented sync byte Sync n = not randomized sync byte, n = 2,3, ., 8 Figure 3: Framing structure STD.ETSI EN 300 748-ENGL 1797 3400855 0217708 5T3 Sync word route Interleaver I = 12 De-interleaver I = 12 12 EN 300 748 Vi .1.2 (1 997-08) Original code GI 02 K (XI (v) 7 171, 133, 4.4.3 Inner coding (convolutional) The System shall allow for a rang
