1、HTTP:/WWW.ITU.INT/DMS_PUB/ITU-R/OPB/QUE/R-QUE-SG06.4-2-2004-MSW-E.DOC 13.04.07 15.07.10QUESTION ITU-R 4-2/6Planning parameters for digital television broadcastingusing terrestrial channels(1993-1994-1997-2001-2004)The ITU Radiocommunication Assembly,consideringa) the progress being made in bit rate
2、reduction techniques;b) that the quality achievable with digital emission systems is improving;c) that different countries can use different digital and analogue television systems;d) that certain digital television broadcasting systems have proven the capability to be used formobile reception;e) th
3、at reception of digital television with small hand held TV receivers is feasible,decides that the following Question should be studied1 What are the frequency planning parameters for such services,including but not limited to: minimum field strengths; implications of modulation and emission methods;
4、 receiving and transmitting antenna characteristics; location correction values; single frequency networks; speed ranges; building penetration loss; indoor location variations?2 What protection ratios are required when two or more digital transmitters of the samesystem, digital transmitters of diffe
5、rent systems, or analogue and digital television transmitters areoperating: in the same channel; in adjacent channels; with overlapping channels; in other potential interference relationships (e.g. image channel); with digital signals multiplexed in the television signal?HTTP:/WWW.ITU.INT/DMS_PUB/IT
6、U-R/OPB/QUE/R-QUE-SG06.4-2-2004-MSW-E.DOC 13.04.07 15.07.103 What receiver characteristics should be used for frequency planning with respect to moreefficient use of the frequency spectrum (e.g. selectivity, noise figure, etc.)?4 What are the protection ratios needed to protect broadcasting services
7、 from other servicessharing the bands or operating in adjacent bands?5 What techniques (e.g. frequency offset, synchronous operation) can be used to reduce thenecessary protection ratios from interference?6 What are the technical bases required for planning which lead to efficient utilization ofband
8、s 8 (VHF), 9 (UHF) and 10/11 (SHF) for terrestrial television services?7 What type of modulation should be recommended for terrestrial television broadcasting inband 10 and band 11?8 What are the radio parameters, including the system characteristics, propagation factors andprotection ratios, that a
9、re necessary for planning and sharing purposes in bands 10/11 (SHF)?9 What are the characteristic multipath conditions that need to be taken into account in theplanning of such services?10 What technical or planning criteria can be optimized to facilitate the implementation ofterrestrial digital bro
10、adcasting, taking into account existing services?11 What are the characteristics of the mobile multipath channel that are needed to be taken intoaccount in the use of mobile reception, at different speeds?12 What are the characteristics of the multipath channel that are needed to be taken intoaccount in the use of hand-held reception, at different speeds?further decides1 that the results of the above studies should be included in (a) Recommendation(s);2 that the above studies should be completed by 2006.Category: S1
