1、 IEC 62553 Edition 1.0 2012-11 INTERNATIONAL STANDARD Methods of measurement for digital network Performance characteristics of terrestrial digital multimedia transmission network IEC 62553:2012(E) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2012 IEC, Geneva, Switzerland All righ
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9、 of measurement for digital network Performance characteristics of terrestrial digital multimedia transmission network INTERNATIONAL ELECTROTECHNICAL COMMISSION XA ICS 33.170 PRICE CODE ISBN 978-2-83220-502-0 Registered trademark of the International Electrotechnical Commission Warning! Make sure th
10、at you obtained this publication from an authorized distributor. colour inside 2 62553 IEC:2012(E) CONTENTS FOREWORD . 5 1 Scope . 7 2 Normative references . 7 3 Terms and abbreviations 8 4 General conditions of measurement . 9 4.1 Definitions and classifications of digital terrestrial TV transmissi
11、on network 9 4.1.1 General . 9 4.1.2 Network classification for transmitting frequencies . 10 4.1.3 Network classification on useable contribution links for signal transport system between stations . 11 4.2 Signal form 11 4.2.1 TS signal form . 11 4.2.2 IF signal form 11 4.3 Test signals and auxilia
12、ry signals for measurement . 11 4.3.1 Test signals . 11 4.3.2 Auxiliary signals for measurement . 12 5 Methods of measurement for signal delay time . 12 5.1 Scope 12 5.2 Definition of signal delay time 13 5.2.1 Delay time . 13 5.2.2 Relative delay time difference 13 5.3 Direct/indirect measurement 1
13、3 5.3.1 General . 13 5.3.2 Direct measurement system 14 5.3.3 Indirect measurement system . 14 5.4 Measurement place . 14 5.5 Classification of measurement system . 15 6 Methods of measurement for performances of radio wave relay station 17 6.1 Scope 17 6.2 Measurement diagram and measurement items
14、. 17 6.2.1 General . 17 6.2.2 Measurement diagram . 17 6.2.3 Measurement items . 18 6.3 Methods of measurement 18 6.3.1 General . 18 6.3.2 BER (case 2) . 19 6.3.3 Equivalent noise degradation (END) 20 6.3.4 Amplitude frequency characteristics 21 6.3.5 Delay profile 22 6.3.6 Phase jitter 22 7 Methods
15、 of measurement for performances of signal quality improvement instrument used in radio wave relay station . 24 7.1 General . 24 7.2 Classification of signal quality improvement instrument . 25 7.3 Measurement diagram and measurement condition . 25 7.4 Common measurement items 25 62553 IEC:2012(E) 3
16、 7.5 Methods of measurement for each kind of compensator 26 Annex A (informative) Examples of measurement methods for signal delay . 27 Annex B (informative) Examples of measurement methods for signal quality of relay stations . 38 Annex C (normative) Principle and methods of measurement of compensa
17、tors 45 Figure 1 Example of transmission network . 10 Figure 2 Delay time and relative delay time difference definitons . 13 Figure 3 Direct and indirect measurement method . 14 Figure 4 Measurement diagram of received signal of relay station (case a) . 17 Figure 5 Measurement diagram of relay stati
18、on (case b) . 17 Figure 6 BER- Measurement method . 20 Figure 7 Definition of END . 21 Figure 8 Measurement diagram of amplitude-frequency characteristics 22 Figure 9 Measurement block diagram of delay profile 22 Figure 10 Reference model 23 Figure 11 Conceptual diagram of relay station using a comp
19、ensator 25 Figure A.1 General measurement system for cases 1 to 3 . 27 Figure A.2 Example of frame sync signal extracting part 28 Figure A.3 Example of OFDM demodulator for frame timing extraction . 29 Figure A.4 Block diagram of direct measurement methods for time delay of OFDM signal 30 Figure A.5
20、 Example of frequency characteristics of combined signal 31 Figure A.6 Example of delay profile of combined signal . 31 Figure A.7 General measurement system for cases 5,6,13 and 14 . 32 Figure A.8 Timing chart for signal delay measurement . 32 Figure A.9 Principle of measurement using 1 pps signal
21、33 Figure A.10 General measurement system for cases 7, 8 and 15,16 34 Figure A.11 Measurement system for delay time (time reference is 1pps signal of GPS). 35 Figure A.12 Timing relation of each signals 36 Figure A.13 Delay profile of OFDM signal 37 Figure B.1 BER measurement conceptual diagram for
22、Null Packet method 39 Figure B.2 Examples of measurement result by Null Packet method 39 Figure B.3 Method to compare the data before/after correction 40 Figure B.4 Superimposed C/N measurement system 41 Figure B.5 Inherent degradation of OFDM demodulator measurement system . 43 Figure B.6 Calculati
23、on process of delay profile 44 Figure C.1 Example of measurement block diagram for performances of loop-back canceller . 46 Figure C.2 Example of measurement block diagram for performances of diversity reception equipment . 48 Figure C.3 Example of measurement block diagram for performances of co-ch
24、annel interference canceller . 50 4 62553 IEC:2012(E) Figure C.4 Example of measurement block diagram for performances of C/N Reset equipment . 52 Table 1 Classification of contribution link . 11 Table 2 Parameter set of OFDM signal for test in ISDB-T system. 11 Table 3 Parameter set of OFDM signal
25、for test in DVB-T/H system 12 Table 4 Combination of signal type 13 Table 5 Classification of measurement system for signal delay time 16 Table 6 An example of measurement items for Relay station . 18 Table 7 Example of the parameter set of spectrum analyzer 22 Table 8 Compensators used in digital t
26、errestrial broadcasting relay network 25 Table 9 Examples of measurement items for signal quality improvement instrument 26 Table A.1 Signal format and timing extraction of each case . 27 Table A.2 Equipment list for measurement . 30 Table A.3 Equipment list for delay time measurement 35 Table B.1 D
27、efinition of Null Packet (in case of ISDB-T) 38 Table B.2 Example of noise power measurement parameters (6 MHz ISDB-T) . 42 Table B.3 Example of signal power measurement parameters (6 MHz ISDB-T) 42 62553 IEC:2012(E) 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ METHODS OF MEASUREMENT FOR DIGITAL NE
28、TWORK Performance characteristics of terrestrial digital multimedia transmission network FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is
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38、le for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62553 has be
39、en prepared by subcommittee IEC technical committee 103: Transmitting equipment for radiocommunication. The text of this standard is based on the following documents: CDV Report on voting 103/89/CDV 103/106/RVC Full information on the voting for the approval of this standard can be found in the repo
40、rt on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 6 62553 IEC:2012(E) The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http
41、:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cover page of th
42、is publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 62553 IEC:2012(E) 7 METHODS OF MEASUREMENT FOR DIGITAL NETWORK Performance characteristics of terrestr
43、ial digital multimedia transmission network 1 Scope When a transmission network for digital terrestrial television broadcasting (DTTB) is being deployed, new networking technologies such as the Single Frequency Network (SFN) can be employed excelling the conventional analogue TV systems. However, ne
44、w technical evaluation parameters are introduced for installing SFN systems. In addition new quality evaluation methods are also established in order to achieve stable and high-quality broadcasting services avoiding the cliff effect, which is one of the typical phenomena in the digital transmission
45、that the signal quality is abruptly degraded when the received C/N becomes just lower than a specific value representing the system limit. Given the background described above, this International Standard has the purposes of establishing measuring methods that enable the objective evaluation of the
46、performance of transmission networks so as to make stable DTTB services a reality, establishing a technical baseline, such as a definition of technical terms, to standardize measuring methods. The measurement methods described in this standard are intended for digital terrestrial television transmis
47、sion network test and validation. The measurement methods for digital terrestrial transmitter are not included in this standard. These methods are described in IEC 62273-1. This standard does not give any regulations and/or mandatory requirements. The specifications and requirements defined for each
48、 system have priority over this standard. However, there may be some cases where details are not specified in each individual specification or different systems should be evaluated under a common measurement method. The purpose of this standard is to provide a common technical baseline that makes me
49、asurement results comparable in all cases. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 62273-1:2007, Methods of measurement for radio tran
