1、BRITISH STANDARD BS EN 60835-2-4:1997 BS 7573-2.4: 1993 IEC 835-2-4: 1993 Incorporating Amendment No.1 to BS 7573-2.4:1993 (renumbers BS as BSEN 60835-2-4:1997) and Amendment No. 1 to BS EN 60835-2-4: 1997 Methods of measurement for equipment used in digital microwave radio transmission systems Part
2、 2: Measurements on terrestrial radio-relay systems Section 2.4 Transmitter/receiver including modulator/demodulator The European Standard EN 60835-2-4:1995 with the incorporation of amendment A1:1997 has the status of a British Standard ICS 33.060.30BSEN 60835-2-4:1997 This British Standard, having
3、 been prepared under the direction of the Electronic Equipment Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 September 1993 BSI 04-1999 The following BSI references relate to the work on this standard: Committee reference EEL/25 Draf
4、t for comment 90/33697 DC ISBN 0 580 22222 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technical Committee EEL/25, upon which the following bodies were represented: British
5、 Broadcasting Corporation British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc Institution of Electrical Engineers Radio, Electrical and Television Retailers Association Radiocommunications Agency The following body was also represented in the drafting of t
6、he standard through subcommittees and panels: ERA Technology Ltd. Amendments issued since publication Amd. No. Date Comments 9595 September 1997 9923 April 1998 Indicated by a sideline in the marginBSEN60835-2-4:1997 BSI 04-1999 i Contents Page Committees responsible Inside front cover National fore
7、word ii Foreword 2 Introduction 3 1 Scope 3 2 Normative references 3 3 Transmitter including modulator 4 4 Receiver including demodulator 5 5 Transmit-receive section 7 Annex A (informative) Bibliography 17 Annex ZA (normative) Other international publications quoted in this standard with the refere
8、nces of the relevant European publications 18 Figure 1 Examples of signal processors used in digital transmitters and receivers 10 Figure 2 Arrangement for measuring the selectivity of the carrier part of a digital receiver 11 Figure 3 Arrangement for measuring the transmission performance of a digi
9、tal transmit/receive section under flat-fading conditions 12 Figure 4 Example of a bit-error-ratio curve of a digital transmit/receive section as a function of receiver input level (simulated flat-fading) 13 Figure 5 Functional arrangement of the fading simulator 14 Figure 6 Wideband frequency chara
10、cteristic of the two-ray i.f.fading simulator 14 Figure 7 Example of minimum/non-minimum phase signature 15 Figure 8 Arrangements for measuring the group-delay/frequency characteristic of a digital transmit/receive section 16 List of references Inside back coverBSEN 60835-2-4:1997 ii BSI 04-1999 Nat
11、ional foreword This Section of BS EN60835 has been prepared by Technical Committee EPL/102 (formerly EEL/25), and is the English language version of EN60835-2-4:1995, Methods of measurement for equipment used in digital microwave radio transmission systems Part 2: Measurements on terrestrial radio-r
12、elay systems Section 4: Transmitter/receiver including modulator/demodulator, including amendment A1:1997, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC835-2-4:1993, published by the International Electrotechnical Committee(IEC). Cross-r
13、eferences Attention is drawn to the fact thatAnnex ZA lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the sect
14、ion entitled “International Standards Correspondence Index”, or using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Co
15、mpliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theENtitle page, pages 2 to 18, an inside back cover and a back cover. This standard has been updated (see copyri
16、ght date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60835-2-4 January 1995 + A1 December 1997 ICS 33.060.30 Descriptors: Radiocommunications, telecommunications, communication
17、equipment, radio-relay systems, microwave frequencies, digital technics, transmitters, receivers, modems, measurements, characteristics English version Methods of measurement for equipment used in digital microwave radio transmission systems Part2:Measurements on terrestrial radio-relay systems Sect
18、ion 4: Transmitter/receiver including modulator/demodulator (IEC 835-2-4:1993) (includes amendment A1:1997) Mthodes de mesure applicables au matriel utilis pour les systmes de transmission numrique en hyperfrquence Partie2:Mesures applicables aux faisceaux hertziens terrestres Section 4: Emetteur/rc
19、epteur, modulateur/dmodulateur inclus (CEI 835-2-4:1993) (inclut lamendement A1:1997) Meverfahren fr Gerte in digitalen Mikrowellen-Funkbertragungssystemen Teil2: Messungen an terrestrischen Richtfunksystem Hauptabschnitt 4: Sender/Empfnger einschlielich Modulator/Demodulator (IEC 835-2-4:1993) (enh
20、lt nderung A1:1997) This European Standard was approved by CENELEC on 1994-12-06 and amendment A1 was approved on 1997-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standa
21、rd without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other
22、 language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany,
23、Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretar
24、iat: rue de Stassart 35, B-1050 Brussels 1998 Copyright reserved to CENELEC members Ref. No. EN 60835-2-4:1995+A1:1997EEN60835-2-4:1995 BSI 04-1999 2 Foreword The text of the International Standard IEC 835-2-4:1993, prepared by SC12E, Radio-relay and fixed satellite communications systems, of IECTC1
25、2, Radiocommunications, was submitted to the formal vote and was approved by CENELEC as EN60835-2-4 on1994-12-06 without any modification. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information o
26、nly. In this standard,Annex ZA is normative andAnnex A is informative. Annex ZA has been added by CENELEC. Foreword to Amendment A1 The text of document 102/8/FDIS, future amendment1 to IEC 60835-2-4:1993, prepared by IEC TC102, Equipment used in mobile services and satellite communication systems,
27、was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A1 to EN 60835-2-4:1997 on1997-10-01. The following dates were fixed: Endorsement notice The text of amendment1:1997 to the International Standard IEC60835-2-4:1993 was approved by CENELEC as an amendment to the
28、European Standard without, any modification. latest date by which the ENhas to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1995-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1995-12-0
29、1 latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1998-08-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow) 1998-08-01EN60835-2-4:1995 BSI 04-199
30、9 3 Introduction Several types of modulation may be used for the transmission of the main digital signal. Of these, only measurements applicable to systems using phase modulation or phase and amplitude modulation, e.g.PSK and n-QAM, will be covered in this section of IEC835-2, since these modulation
31、 types are employed in the majority of digital radio-relay systems. The digital transmitter is preceded by a transmit signal processor which modifies the multiplexed digital to facilitate radio transmission. Similarly, the receiver is followed by a receive signal processor in order to recover the di
32、gital signal. Measurements on these signal processors are dealt with in IEC835-2-5, but in order to clarify their main functions and interconnection points in transmitter/receiver measurements, examples are given inFigure 1. A further function of signal processors, not shown inFigure 1, may be the c
33、ombination and separation of more than one bit-stream. The interconnection points between the transmit processor and modulators and also between the receive processor and demodulator are not always accessible. Digital transmitter and receiver measurements are conveniently grouped into three parts fo
34、r testing; measurements on transmitters including modulators are given in3, measurements on receivers including demodulators in clause4, whilst clause5 deals with transmit-receive section (or“hop”) measurements. For some of the parameters, only those aspects related to the fact that the measurement
35、is carried out on a transmitter or receiver are given, and reference is made to other sections of IEC835-2 for detailed methods of measurements. All measurements should be carried out under specified environmental conditions, such as temperature and humidity, in accordance with IEC835-2-1. 1 Scope T
36、his Section of IEC 835-2 deals with methods of measurement for transmitters including modulators, and receivers including demodulators, used in digital radio-relay systems. Measurements for adaptive equalizers are given in IEC 835-2-8. Methods of measurement for the a.g.c.characteristic, selectivity
37、 and noise figure and receiver local oscillator frequency are generally applicable only when the receiver i.f.output is accessible. This may not be the case for receivers used in systems having a microwave demodulator or a low bit rate, e.g.below 2 Mbit/s. 2 Normative references The following normat
38、ive documents contain provisions which, through reference in this text, constitute provisions of this section of IEC835-2. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this section of IEC835-2 are e
39、ncouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 835-1-1:1990, Methods of measurement for equipment used in digital microwave radio trans
40、mission systems Part 1: Measurements common to terrestrial radio-relay and satellite earth stations Section 1: General. IEC 835-1-2:1992, Methods of measurement for equipment used in digital microwave radio transmission systems Part 1: Measurements common to terrestrial radio-relay and satellite ear
41、th stations Section 2: Basic characteristics. IEC 835-1-3:1992, Methods of measurement for equipment used in digital microwave radio transmission systems Part 1: Measurements common to terrestrial radio-relay and satellite earth stations Section 3: Transmission characteristics. IEC 835-1-4:1992, Met
42、hods of measurement for equipment used in digital microwave radio transmission systems Part 1: Measurements common to terrestrial radio-relay and satellite earth stations Section 4: Transmission performance. IEC 835-2-1:1990, Methods of measurement for equipment used in digital microwave radio trans
43、mission systems Part 2: Measurements on terrestrial radio-relay systems Section 1: General. IEC 835-2-5:1993, Methods of measurement for equipment used in digital microwave radio transmission systems Part 2: Measurements on terrestrial radio-relay systems Section 5: Digital signal processing subsyst
44、em. IEC 835-2-8:1993, Methods of measurement for equipment used in digital microwave radio transmission systems Part 2: Measurements on terrestrial radio-relay systems Section 8: Adaptive equalizer. EN60835-2-4:1995 4 BSI 04-1999 CCIR Recommendation 556, Hypothetical reference digital path for radio
45、-relay systems which may form part of an integrated services digital network; systems with a capacity above the second hierarchical level. CCIR Recommendation 557, Availability objective for a hypothetical reference circuit and a hypothetical reference digital path. CCIR Recommendation 594, Allowabl
46、e bit error ratios at the output of the hypothetical reference digital path for radio-relay systems which may form part of an integrated services digital network. CCITT Recommendation O.151, Specification for instrumentation to measure error performance on digital systems. CCITT Recommendation G.703
47、, Physical/electrical characteristics of hierarchical digital interfaces. 3 Transmitter Including modulator 3.1 General Examples of digital transmitters with r.f.and i.f.modulators are given in IEC835-1-1. In multi r.f.channel systems, the transmitting filter, although it may be a part of the branch
48、ing system, should be included in the transmitter measurements, i.e.the r.f.output of the transmitter is regarded as the output from this filter. Measuring instruments should be connected either to this point or, if available, to an equivalent test point. During all of the measurements to be describ
49、ed, only the transmitter under test should be in operation and all other transmitters of the multi-channel system should be switched off. Measurements related to the output port of the i.f.modulator, if applicable, are not included. Nevertheless, such measurements may be required for i.f.modulators. 3.2 Output frequency See IEC835-1-2. The frequency meter is connected via a suitable r.f.attenuator to the transmitter output. Modulation should be disabled to obtain ac.w.carrier. 3.3 R.F.output spect
