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Report ITU-R BT.2252-2 (02/2016)

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Report ITU-R BT.2252-2 (02/2016) Report ITU-R BT.2252-2 (02/2016) Objective quality coverage assessment of digital terrestrial television broadcasting signals of Systems A, B and D BT Series Broadcasting service (television) ii Rep. ITU-R BT.2252-2 Foreword The role of the Radiocommunication Sector is to ensure the rational, 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 Radiocommunication 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 Resolution 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 database can also be found. Series of ITU-R Reports (Also available online at http://www.itu.int/publ/R-REP/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 Fixed 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 SM Spectrum management Note: This ITU-R Report was approved in English by the Study Group under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2016 ITU 2016 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rep. ITU-R BT.2252-2 1 REPORT ITU-R BT.2252-2 Objective quality coverage assessment of digital terrestrial television broadcasting signals of Systems A, B and D (2012-2013-2016) Introduction In May 2011, it was decided to establish a Working Party 6A Rapporteur Group to develop a report on objective quality coverage assessment of digital terrestrial television broadcasting signals of System B. It was realized that Recommendation ITU-R BT.1735 covers MFN networks. A number of countries have developed networks based on an SFN configuration, whereby transmitters are placed far apart. In such networks, the use of the maximum permissible guard interval together with high code rate (i.e. 3/4 or 5/6) results in a very complex impulse response with a lot of reflected rays, both natural and artificial falling on the shoulder, or outside, the guard interval. The situation is further complicated, due to field-strength variations at the receiving point originated by the farthest transmitters. Such variations impact on the positioning of the window in the receiver, depending on the strategy implemented by manufacturers, and sometimes one or more rays of sufficient energy fall outside the guard interval. In such conditions it may easily happen that different receiving situations are detected during the day and it is not easy to find a simple algorithm to determine coverage quality. Moreover the relationship between BER measurements taken before and after Viterbi decoding depends on unpredictable factors and an evaluation on BER before Viterbi decoding does not permit it to be known if BER after Viterbi decoding would fall below the threshold or above it. Moreover, since MER and BER measurements are based on different aspects of the phenomenon, no close relationship can be identified between them. It was concluded there is a need for a new multidimensional evaluation system that supersedes the one specified in Recommendation ITU-R BT.1735 which remains valid for MFN networks. In October 2011, it was decided to continue with Rapporteur Group on the revision of Recommendation ITU-R BT.1735 with the mandate to put all the relevant material into a draft new Report ITU-R BT.[DTTBACCESS]. The Rapporteur Group met during the first days of April 2012 and decided to add the contribution on System A contained in Document 6A/14 and the contribution received from Ls Telcom. 2 Rep. ITU-R BT.2252-2 TABLE OF CONTENTS Page PART 1 – Objective quality coverage assessment of digital terrestrial television broadcasting signals for DTTB System A ...................................................................... 4 1 Performance characteristics of System A in the terrestrial broadcast mode .................. 4 2 Relationship between objective BER and subjective visual TOV for System A ........... 4 PART 2 – Objective quality coverage assessment of digital terrestrial television broadcasting signals for DTTB System B ...................................................................... 6 Chapter 1 of Part 2 ................................................................................................................... 6 1.1 Service area and local SFN ................................................................................. 6 1.2 MUX1 quality coverage (regional SFN multiplex – local area SFN) ................ 7 1.3 Improvements and verification ........................................................................... 10 1.4 Other MUX quality coverage (national multiplex – wide area SFN) ................. 15 1.5 Conclusions ......................................................................................................... 17 Chapter 2 of Part 2 ................................................................................................................... 19 2.1 Introduction ......................................................................................................... 19 2.2 Correlation between field strength, cBER and MER for MFN networks ........... 20 Annex A ................................................................................................................................... 37 1 VHF Band III – Victoria ................................................................................................. 37 2 UHF Band IV – Victoria ................................................................................................ 39 3 UHF Band V – Victoria .................................................................................................. 40 Annex B ................................................................................................................................... 43 1 VHF Band III – Coastal New South Wales and Queensland ......................................... 43 2 UHF Band IV – Coastal New South Wales and Queensland ......................................... 44 3 UHF Band V – Coastal New South Wales and Queensland .......................................... 46 Annex C ................................................................................................................................... 49 1 VHF Band III – Inland New South Wales and Queensland ........................................... 49 2 UHF Band IV – Inland New South Wales and Queensland ........................................... 50 3 UHF Band V – Inland New South Wales and Queensland ............................................ 52 Annex D ................................................................................................................................... 54 Rep. ITU-R BT.2252-2 3 1 UHF Band IV – Inland South Australia, Victoria and Queensland ................................ 55 2 UHF Band V – Inland South Australia, Victoria and Queensland ................................. 55 2.3 Determination of the transition point in the DTTB coverage quality scale ........ 56 2.4 Example for SFN network .................................................................................. 61 2.5 Results for possible correlation between parameters .......................................... 63 2.6 Review of Figure 1 of Annex 1 of Recommendation ITU-R BT.1735 .............. 63 2.7 Deployment method for field survey data analysis ............................................ 66 2.8 CIR considerations on how to deal with contribution falling or can fall outside GI ............................................................................................................ 70 Chapter 3 of Part 2 ................................................................................................................... 72 3.1 Introduction ......................................................................................................... 72 3.2 Tests .................................................................................................................... 72 3.3 Study of SFN echoes symmetry ......................................................................... 73 3.4 MER and BER analysis in a SFN with multiple signals inside GI ..................... 75 3.5 MER and BER analysis in a SFN with a contribution outside GI ...................... 76 3.6 MER and BER analysis in a SFN with contribution inside and outside GI ....... 79 3.7 Study of the allowable limit value of the combination level-delay outside GI .. 80 3.8 Verification of the protection ratio ..................................................................... 82 3.9 General BER frame ............................................................................................
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