1、 IEC/TR 62002-4 Edition 1.0 2009-04 TECHNICAL REPORT Mobile and portable DVB-T/H radio access Part 4: Measurement methods for total radiated sensitivity in hand-held broadcast terminals IEC/TR 62002-4:2009(E) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2009 IEC, Geneva, Switzerland All rights
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10、0 IEC/TR 62002-4 Edition 1.0 2009-04 TECHNICAL REPORT Mobile and portable DVB-T/H radio access Part 4: Measurement methods for total radiated sensitivity in hand-held broadcast terminals INTERNATIONAL ELECTROTECHNICAL COMMISSION M ICS 33.060.99 33.170 PRICE CODE ISBN 2-8318-1035-9 Registered tradema
11、rk of the International Electrotechnical Commission 2 TR 62002-4 IEC:2009(E) CONTENTS FOREWORD. 03 INTRODUCTION. 1H1H5 1 Scope. 2H2H6 2 Normative references . 3H3H6 3 Abbreviations . 4H4H7 4 Basic concepts . 5H5H7 4.1 Effective Isotropic Sensitivity (EIS) 6H6H7 4.2 Total Radiated Sensitivity (TRS).
12、7H7H7 5 Measurement conditions. 8H8H8 5.1 Initial conditions 9H9H8 5.2 Measurement chamber 10H10H9 5.3 Frequencies 11H11H9 5.4 Sampling grid 12H12H9 6 Measurement procedure. 13H13H9 6.1 Set-up . 14H14H9 6.2 Calibration. 15H15H9 6.3 TRS measurements 16H16H10 6.4 EIS measurement 17H17H10 6.5 Calculati
13、on of the TRS at other channels 18H18H10 Annex A (informative) TRS and the peak antenna gain defined in IEC 62002-1. 19H19H11 Bibliography 20H20H12 Table A.1 Typical TRS for terminal category c for QPSK 1/2, MPE-FEC 3/4. 21H21H11 TR 62002-4 IEC:2009(E) 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ M
14、OBILE AND PORTABLE DVB-T/H RADIO ACCESS Part 4: Measurement methods for total radiated sensitivity in hand-held broadcast terminals FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC
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25、mmittee may propose the publication of a technical report when it has collected data of a different kind from that which is normally published as an International Standard, for example “state of the art“. IEC 62002-4, which is a technical report, has been prepared by technical area 1: Terminals for
26、audio, video and data services and content, of IEC technical committee 100: Audio, video and multimedia systems and equipment. The text of this technical report is based on the following documents: Enquiry draft Report on voting 100/1498/DTR 100/1525/RVC Full information on the voting for the approv
27、al of this technical report can be found in the report on voting indicated in the above table. 4 TR 62002-4 IEC:2009(E) This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the
28、 maintenance result date indicated on the IEC web site under “http:/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 la
29、ter date. TR 62002-4 IEC:2009(E) 5 INTRODUCTION This Technical Report describes a measurement method to asses the radio performance of a DVB-T/H hand-held terminal by measuring the radiated sensitivity of the terminal. It is a simplified version of the method described in 3GPP TR 25.914 10F0F 1 , an
30、d is adopted to be suitable for a broadcast receiver supporting a wide range of reception frequencies. 1The figure in square brackets refers to the Bibliography. 6 TR 62002-4 IEC:2009(E) MOBILE AND PORTABLE DVB-T/H RADIO ACCESS Part 4: Measurement methods for total radiated sensitivity in hand-held
31、broadcast terminals 1 Scope This part of IEC 62002 gives a standard method to test Total Radiated Sensitivity (TRS) of a category c) terminal specified in IEC 62002-1. This is a practical measure of the radiated sensitivity as it takes into account both the terminal antenna efficiency and possible t
32、erminal generated additional noise. Moreover, it can be used directly in the link budget calculations for the network coverage predictions. The motivation for the TR has been the lack of suitable measurement methods to characterise the terminal antenna in a common and practical way. As the 3GPP TR 2
33、5.914 method is in many ways suitable for the task, it was decided to develop a simplified version of this method by taking into account the special requirements for broadcast terminals. The test method applies to terminals in terminal category c) with either internal or external antennas. The effec
34、t of the user on the antenna radiation pattern is not taken into account. The method is based on a 3-D radiation pattern measurement. At first a full 3-D 4 sensitivity measurement is performed at three frequencies with both polarisations. From this measurement the TRS at these frequencies can be cal
35、culated. The best direction for sensitivity at the middle frequency is observed and then the Effective Isotropic Sensitivity (EIS) is measured in this direction at all specified reception channels. It is assumed that the average difference between the measured EIS and TRS is valid also for the other
36、 frequencies and thus the TRS at all specified channels can be calculated. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referen
37、ced document (including any amendments) applies. IEC 62002-1:2008, Mobile and portable DVB-T/H radio access Part 1: Interface specification IEC 62002-2:2008, Mobile and portable DVB-T/H radio access Part 2: Interface conformance testing IEC/TR 62002-3, Mobile and portable DVB-T/H radio access Part 3
38、: Measurement interface TR 62002-4 IEC:2009(E) 7 3 Abbreviations For the purposes of this document, the following abbreviations apply. Antenna efficiency Wavelength in meters Direction angle Polarisation C Carrier power in band carrier power including any echoes C/N Carrier-to-noise ratio dB Decibel
39、 dB(mW) Power in dB compared to 1 mW DVB, DVB-T Digital video broadcasting, terrestrial digital video broadcasting DVB-H Digital video broadcasting to hand-held terminals EIS Effective Isotropic Sensitivity F, f Frequency in Hz MHz Megahertz P minMinimum power PI Pedestrian Indoor TRS Total Radiated
40、 Sensitivity 4 Basic concepts 4.1 Effective Isotropic Sensitivity (EIS) Effective Isotropic Sensitivity (EIS) is the isotropic power needed for the terminal to reach the required degradation point (see 6.4.3.1 in IEC 62002-2). EIS is a function of direction , frequency f and polarisation and can be
41、denoted as EIS (, f), for polarisation . Typically, when a single figure is given, it is measured in the best direction of the terminal antenna. In principle, EIS can be measured by adjusting the power level of the transmitter until the receiver reaches the sensitivity threshold. The receiver is the
42、n replaced by an isotropic antenna and the power at the output of the antenna is measured as EIS. Practical measurements use a calibrated reference antenna instead of an isotropic antenna. 4.2 Total Radiated Sensitivity (TRS) Total Radiated Sensitivity (TRS) is the integrated EIS power over the sphe
43、re with both polarisations: () () () d , 1 , 1 4 V H + = f EIS f EIS f TRS 8 TR 62002-4 IEC:2009(E) where is the direction angle; EIS His EIS in horizontal polarisation; EIS Vis EIS in vertical polarisation; f is the frequency. TRS is thus the total received power at the sensitivity threshold from a
44、ll directions and both polarisations. TRS can be considered to present quite well the practical receiver sensitivity at difficult reception conditions as in multipath conditions several rays arrive from different directions and with different polarisations. A practical measurement is done with a dis
45、crete sampling grid. In this case the TRS can be defined as: () ()() + = f EIS f EIS f TSR n n n n M N , , , , V H 1 0 1 0 1 1 4where is the zenith angle; is the azimuth angle; N is number of samples in the zenith angle; M is number of samples in the azimuth angle; = /N is the sampling grid in zenit
46、h angle; = 2/M is the sampling grid in azimuth angle. The difference between the conducted sensitivity measurement (see 6.2.1 and 6.4 in IEC 62002-2) and the TRS measurement gives directly the total efficiency of the terminal antenna. For ideal isotropic antennas = 1 and TRS becomes the same as the
47、conducted sensitivity P min . For example, if the TRS is 10 dB higher than the conducted sensitivity P min , the antenna efficiency is 0,1. Note that this antenna efficiency definition includes possible noise contributions radiated from the terminal to the antenna. () ) ( log 10 ) ( 10 min f P f TRS
48、 = (dB(mW) It should also be noted that TRS is typically measured in an anechoic chamber presenting Gaussian channel conditions and using a pure signal from the signal source. When using the TRS figures in link budget calculations a correction should be made to take into account the wanted channel c
49、onditions. For example, in Pedestrian Indoor (PI) channel conditions the difference between C/N-requirement in PI and Gaussian channel should either be measured or taken from 10.7.1 and 10.7.3 in IEC 62002-1 and then added to the measured TRS to get a TRS presenting PI-channel. Another way to measure the difference is to apply a PI channel with a channel si
