ITU-R BT 2036-2-2018 Characteristics of a reference receiving system for frequency planning of digital terrestrial television systems.pdf

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1、 Recommendation ITU-R BT.2036-2 (03/2018) Characteristics of a reference receiving system for frequency planning of digital terrestrial television systems BT Series Broadcasting service (television) ii Rec. ITU-R BT.2036-2 Foreword The role of the Radiocommunication Sector is to ensure the rational,

2、 equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommuni

3、cation Sector are performed by World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Reso

4、lution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information

5、database can also be found. Series of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fix

6、ed service M Mobile, radiodetermination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems

7、 SM Spectrum management SNG Satellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2018 ITU 2018 All rights

8、 reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R BT.2036-2 1 RECOMMENDATION ITU-R BT.2036-2 Characteristics of a reference receiving system for frequency planning of digital terrestrial television systems (Questions ITU-

9、R 114/6 and ITU-R 132-3/6) (2013-2016-2018) Scope This Recommendation defines characteristics of reference receiving systems for various digital terrestrial television systems employed as a basis for frequency planning digital terrestrial television services in the VHF/UHF bands. Keywords Digital te

10、rrestrial television, receiver characteristics, radio frequency, frequency planning, VHF, UHF, protection ratio, adjacent channel selectivity The ITU Radiocommunication Assembly, considering a) that digital terrestrial television services using a variety of systems are now in widespread use; b) that

11、 the ITU-R has responsibility for international frequency planning and inter-service sharing to ensure equitable and efficient use of the radio spectrum; c) that the error-correction, data framing, modulation and emission methods for first- and second-generation digital terrestrial television broadc

12、asting (DTTB) systems are defined in Recommendations ITU-R BT.1306 and ITU-R BT.1877, respectively; d) that the criteria for planning digital terrestrial television services in the VHF/UHF bands are given in Recommendations ITU-R BT.1368 and BT.2033; e) that frequency planning parameters for Digital

13、 video broadcasting terrestrial (DVB-T) in Region 1 and the Islamic Republic of Iran are defined by the GE06 Agreement which planned Band III (174-230 MHz) for digital sound and television broadcasting and Bands IV/V (470-862 MHz) for digital television broadcasting. The GE06 Agreement gives the fra

14、mework for television frequency planning coordination among Region 1 countries and the Islamic Republic of Iran; f) that the International Electrotechnical Commission (IEC) has responsibilities relating to television receiver standards and methods of measurement and definitions; g) that nominal char

15、acteristics of and measurement methods for digital television receivers have been established for the various DTTB systems in the IEC; h) that while there is a necessary connection between the receiver characteristics required as limit specifications for manufacturing, efficient spectrum use and fre

16、quency planning should take account of the complete receiving system and should be based on a representative reference receive system rather than “worst-case” limit specifications, 2 Rec. ITU-R BT.2036-2 recommends 1 that the common characteristics of reference television receiving systems given in

17、Annex 1 should be employed as a basis for frequency planning; 2 that the characteristics of reference first-generation television receiving systems given in Annex 2 should be employed as a basis for frequency planning1; 3 that the characteristics of reference second-generation television receiving s

18、ystems in Annex 3 should be employed as a basis for frequency planning1. Annex 1 Digital terrestrial television common receiving system characteristics for frequency planning Tables 1 to 5 below provide values for common receiver characteristics applicable to any digital terrestrial television syste

19、ms in frequency planning. TABLE 1 Receiver antenna height (m) Reception mode Fixed roof top reception Portable outdoor/ mobile Portable indoor Receiver antenna height above ground 10 1.5 1.5 TABLE 2 Receiving antenna directivity Receiving antenna directivity See Rec. ITU-R BT.419 TABLE 3 Receiver no

20、ise figure (dB) Band I Band III Bands IV/V Frequency (MHz) 47-68 174-230 470-862 Receiver noise figure 7 to 10 6 to 10 6 to 7 1 The definitions, methods of measurement and presentation of results used in the Annex are consistent with relevant IEC standards/specifications. Rec. ITU-R BT.2036-2 3 TABL

21、E 4 Antenna gain (dBd) Band I Band III Band IV Band V Frequency (MHz) 47-68 174-230 470-582 582-862 Fixed roof top reception 4 5 to 7 8 to 10 9 to 12 TABLE 5 Feeder loss (dB) Band I Band III Band IV Band V Frequency (MHz) 47-68 174-230 470-582 582-862 Fixed roof top reception 1 2 3 to 4 4 to 5 Annex

22、 2 Digital terrestrial television first-generation reference receiving system characteristics for frequency planning2 1 Introduction The characteristics of reference first-generation television receiving systems given in this Annex are to be employed as a basis for frequency planning. 1.1 Definition

23、s Adjacent channel selectivity (ACS): it is a measure of the receiver ability to receive a wanted signal at its assigned channel frequency in the presence of an unwanted adjacent channel signal at a given frequency offset from the centre frequency of the assigned channel. It is most often defined as

24、 the ratio of the receiver filter attenuation on the adjacent channel frequency to the receiver filter attenuation on the assigned channel frequency. Radio frequency protection ratio (PR): it is the minimum value of the wanted-to-unwanted signal ratio, usually expressed in decibels, at the receiver

25、input, determined under specified conditions such that a specified reception quality of the wanted signal is achieved at the receiver output (see RR (2004), Art. 1 1.170). Usually, PR is specified as a function of the frequency offset between the wanted and interfering signals over a wide frequency

26、range. 2 As DTTB receive system technology is improving rapidly, administrations are invited to study any improvement of the planning parameters which can result from improved receive system characteristics. 4 Rec. ITU-R BT.2036-2 1.2 DVB-T reference receiver characteristics Reference values for the

27、 parameters of a DVB-T reference receiving system are defined for three different reception modes3: Reception mode RM1 for fixed roof top reception. Reception mode RM2 for portable outdoor reception or mobile reception. Reception mode RM3 for portable indoor reception. Tables 6 and 7 give the refere

28、nce DVB-T receiver characteristics for all three RMs for Band III, 7 and 8 MHz channel raster, respectively. Table 8 gives the reference DVB-T receiver characteristics for all three RMs for Bands IV/V. The reference parameters of the RMs that are given in Tables 6, 7 and 8 are not associated with a

29、particular DVB-T system variant or a real DVB-T network implementation; rather, they stand for a large number of different real implementations. TABLE 6 Reference DVB-T receiver characteristics in Band III, 7 MHz channel raster Reception mode RM1 RM2 RM3 Frequency fr (MHz) 200 200 200 Equivalent noi

30、se bandwidth (MHz) 6.66 6.66 6.66 Receiver noise figure (dB) 7 7 7 Receiver noise input power (dBW) 128.7 128.7 128.7 RF signal/noise ratio Reference C/N (dB) 21 19 17 Minimum receiver signal input power (dBW) 107.7 109.7 111.7 Min. equivalent receiver input voltage, 75 (dB(V) 31 29 27 Reference Min

31、imum field strength (Emin)ref (dB(V/m) at fr = 200 MHz 38.5 43.5 41.5 ACS (dB) See Note below NOTE Information on the calculation of adjacent channel selectivity (ACS) values for DVB-T receivers can be found in Recommendation ITU-R BT.1368-10. 3 Those reception modes are equivalent to the Reference

32、Planning Configurations for fixed roof-top, portable outdoor/mobile and portable indoor reception of the GE06 Agreement. Rec. ITU-R BT.2036-2 5 TABLE 7 Reference DVB-T receiver characteristics in Band III, 8 MHz channel raster Reception mode RM1 RM2 RM3 Frequency fr (MHz) 200 200 200 Equivalent nois

33、e bandwidth (MHz) 7.61 7.61 7.61 Receiver noise figure (dB) 7 7 7 Receiver noise input power (dBW) 128.2 128.2 128.2 RF signal/noise ratio Reference C/N (dB) 21 19 17 Minimum receiver signal input power (dBW) 107.2 109.2 111.2 Min. equivalent receiver input voltage, 75 (dB(V) 31.5 29.5 27.5 Referenc

34、e Minimum field strength (Emin)ref (dB(V/m) at fr = 200 MHz 39 44 42 ACS (dB) See Note below NOTE Information on the calculation of ACS values for DVB-T receivers can be found in Recommendation ITU-R BT.1368-10. TABLE 8 Reference DVB-T receiver characteristics in Band IV/V, 8 MHz channel raster Rece

35、ption mode RM1 RM2 RM3 Frequency fr (MHz) 650 650 650 Equivalent noise bandwidth (MHz) 7.61 7.61 7.61 Receiver noise figure (dB) 7 7 7 Receiver noise input power (dBW) 128.2 128.2 128.2 RF signal/noise ratio Reference C/N (dB) 21 19 17 Minimum receiver signal input power (dBW) 107.2 109.2 111.2 Min.

36、 equivalent receiver input voltage, 75 (dB(V) 31.5 29.5 27.5 Reference Minimum field strength (Emin)ref (dB(V/m) at fr = 650 MHz 47 52 50 ACS (dB) See Note below NOTE Information on the calculation of ACS values for DVB-T receivers can be found in Recommendation ITU-R BT.1368-10. The formula for cal

37、culating minimum field strength is given in Attachment 1 to Annex 2 of Recommendation ITU-R BT.1368. For other frequencies, the reference minimum field strength values in Tables 6 and 7 above shall be adjusted by adding the correction factor defined according to the following rule: 6 Rec. ITU-R BT.2

38、036-2 (Emin)ref(f) = (Emin)ref(fr) + 20 log10 (f/fr) where f is the actual frequency and fr the reference frequency of the relevant band quoted in the Table. Further planning parameters, including C/N values, protection ratios and overloading thresholds for particular DVB-T system variants, are give

39、n in Recommendation ITU-R BT.1368. Some parameters concerning the receiving DVB-T system are presented in the following Tables 9 and 10 below. Annex 1 provides common receiver characteristics applicable to any digital terrestrial television systems in frequency planning. TABLE 9 Antenna gain (dBd) B

40、and III Band IV Band V Frequency (MHz) 174-230 470-582 582-862 Fixed roof top reception 7 10 12 Portable/mobile reception 2.2 0 0 TABLE 10 Feeder loss (dB) Band III Band IV Band V Frequency (MHz) 174-230 470-582 582-862 Fixed roof top reception 2 3 5 1.3 Reference receiver characteristics for System

41、 A (ATSC) Reference values for the parameters of an advanced television systems committee (ATSC) reference receiving system (System A) with a 6 MHz bandwidth are given in Tables 11 through 15 in the following sections. The values for the reference receiver in the following sections are intended to a

42、ssure reliable reception and may differ from the protection criteria for planning and channel allocation in Recommendation ITU-R BT.1368. 1.3.1 RF characteristics Table 11 tabulates the basic RF performance characteristics. Rec. ITU-R BT.2036-2 7 TABLE 11 RF characteristics for a reference 6 MHz ATS

43、C receiving system Parameters Reference Guideline Frequency ranges (MHz) 47-68, 174-216, 470-806 Equivalent noise bandwidth (MHz) 6 Minimum bit error rate (BER) for reception 3 106 Maximum receiver sensitivity (dBm) 83 Minimum receiver overload (dBm) 5 Minimum S/N (dB) 15.19 Minimum noise burst dura

44、tion performance 165 s at 10 Hz repetition 1.3.2 Co-channel protection Table 12 provides the minimum ratios for protection of co-channel interference at a “weak wanted” ATSC signal level (68 dBm) and a “moderate wanted” ATSC signal level (53 dBm) at the receiver input. Note that different ratios are

45、 required for interference from ATSC digital television signals as opposed to analogue television interference (National television systems committee (NTSC). TABLE 12 Co-channel protection ratios for a 6 MHz reference ATSC receiving system interfered with by a 6 MHz ATSC digital signal or an NTSC an

46、alogue signal Type of Interference Co-channel wanted/unwanted ratio (dB) Weak wanted ATSC signal (68 dBm) Moderate wanted ATSC signal (53 dBm) ATSC interference into ATSC +15.5 +15.5 NTSC interference into ATSC +2.5 +2.5 NOTE All ATSC values are average power; all NTSC values are peak power. 1.3.3 F

47、irst adjacent channel protection ratios Table 13 tabulates the minimum protection ratios for first adjacent channel interference at various “wanted” signal levels at the receiver input. It is noted that that the DTV into DTV protection ratio values provided in Recommendation ITU-R BT.1368 are 28 and

48、 26 dB, for lower and upper adjacent channel interferences respectively. These protection ratios were based on asymmetric transmitter splatter in the first adjacent channel. For this recommendation, 27 dB is used and a 6 dB margin is added to reach 33 dB. The margin is added to allow for improvement

49、 in DTV transmitter technology. 8 Rec. ITU-R BT.2036-2 TABLE 13 First adjacent channel protection ratios for a reference 6 MHz ATSC receiving system from a 6 MHz interference signal (digital or analogue) in the lower (N 1) or upper (N + 1) adjacent channels at given wanted signal average power levels at the receiver input Type of Interference Adjacent channel wanted/unwanted ratio (dB) Weak wanted (68 dBm) Moderate wanted (53 dBm) Strong wanted (28 dBm) Lower ATSC interference into ATSC (N 1) 33 33 20 Upper ATSC