1、Rec. ITU-R F.1242 1RECOMMENDATION ITU-R F.1242RADIO-FREQUENCY CHANNEL ARRANGEMENTS FOR DIGITAL RADIOSYSTEMS OPERATING IN THE RANGE 1 350 MHz TO 1 530 MHz(Question ITU-R 136/9)(1997)Rec. ITU-R F.1242The ITU Radiocommunication Assembly,consideringa) that as a result of the World Administrative Radio C
2、onference for Dealing with Frequency Allocations inCertain Parts of the Spectrum (Malaga-Torremolinos, 1992) (WARC-92) many administrations may wish to plan fixedservice systems around the bands designated for new mobile, mobile-satellite and broadcast-satellite services;b) that it is sometimes desi
3、rable to be able to interconnect low and medium capacity digital radio systems oninternational circuits using radio frequencies in the 1.5 GHz band;c) that many interfering effects can be substantially reduced by a carefully planned arrangement of the radiofrequencies in radio systems employing seve
4、ral radio-frequency channels;d) that sharing between the fixed service (FS) and mobile service (MS), mobile-satellite service (MSS) orbroadcasting-satellite service (BSS) may be possible by using adequate geographical and/or frequency separation;e) that administrations may have different requirement
5、s for sharing spectrum with the FS, and they may notrequire all the spectrum allocated to MS, MSS or BSS;f) that in Region 1, the band 1 350-1 400 MHz is allocated to the FS,recommends1 that where the introduction of new MS, MSS and/or BSS limits the FS to the band 1 350 to 1 375 MHz pairedwith 1 49
6、2 to 1 517 MHz, a radio-frequency channel arrangement with up to twelve go and return channels is used(carrier spacing of 2 MHz), which is derived as follows:Let f0be the band centre frequency of 1 433.5 MHz,fnbe the centre frequency of a radio-frequency channel in the lower half of the band,fnbe th
7、e centre frequency of a radio-frequency channel in the upper half of the band,DS (Tx/Rx duplex spacing) = 142 MHz,then the frequencies of individual channels with a carrier spacing of 2 MHz are expressed by the following relationships:lower half of band: fn= f0 84 + 2 n MHzupper half of band: fn= f0
8、 58 + 2 n MHzwhere n = 1, 2, 3, . 12.For lower spacings, the frequencies of individual channels are expressed by the following relationships:Carrier spacing of 1 MHz:lower half of band: fn= f0 83.5 + 1 n MHzupper half of band: fn= f0+ 58.5 + 1 n MHz2 Rec. ITU-R F.1242where n = 1, 2, 3, . 24.Carrier
9、 spacing of 0.5 MHz:lower half of band: fn= f0 83.25 + 0.5 n MHzupper half of band: fn= f0+ 58.75 + 0.5 n MHzwhere n = 1, 2, 3, . 48.Carrier spacing of 0.25 MHz:lower half of band: fn= f0 83.125 + 0.25 n MHzupper half of band: fn= f0+ 58.875 + 0.25 n MHzwhere n = 1, 2, 3, . 96.Channel arrangements w
10、ith lower carrier spacings are possible by means of further channel subdivision.Channel arrangements with carrier spacing of 3.5 MHz are possible by means of concatenation of the 0.5 MHz plan. Thefrequencies of individual channels are expressed by the following relationship:lower half of band: fn= f
11、0 83.25 + 3.5 n MHzupper half of band: fn= f0+ 58.75 + 3.5 n MHzwhere n = 1, 2, 3 . 6;2 that where the introduction of new MS, MSS and/or BSS limits the FS to the band 1 375 to 1 400 MHz paired with1 427 to 1 452 MHz, a radio-frequency channel arrangement with up to twelve go and return channels is
12、used(carrier spacing of 2 MHz), which is derived as follows:Let f0be the band centre frequency of 1 413.5 MHz,fnbe the centre frequency of a radio-frequency channel in the lower half of the band,fnbe the centre frequency of a radio-frequency channel in the upper half of the band,DS (Tx/Rx duplex spa
13、cing) = 52 MHz,then the frequencies of individual channels with a carrier spacing of 2 MHz are expressed by the following relationships:lower half of band: fn= f0 39 + 2 n MHzupper half of band: fn= f0+ 13 + 2 n MHzwhere n = 1, 2, 3, . 12.For lower carrier spacings, the frequencies of individual cha
14、nnels are expressed by the following relationships:Carrier spacing of 1 MHz:lower half of band: fn= f0 38.5 + 1 n MHzupper half of band: fn= f0+ 13.5 + 1 n MHzwhere n = 1, 2, 3, . 24.Carrier spacing of 0.5 MHz:lower half of band: fn= f0 38.25 + 0.5 n MHzupper half of band: fn= f0+ 13.75 + 0.5 n MHzw
15、here n = 1, 2, 3, . 48.Rec. ITU-R F.1242 3Carrier spacing of 0.25 MHz:lower half of band: fn= f0 38.125 + 0.25 n MHzupper half of band: fn= f0+ 13.875 + 0.25 n MHzwhere n = 1, 2, 3, . 96.Channel arrangements with lower carrier spacings are possible by means of further channel subdivision.Channel arr
16、angements with carrier spacing of 3.5 MHz are possible by means of concatenation of the 0.5 MHz plan. Thefrequencies of individual channels are expressed by the following relationship:lower half of band: fn= f0 38.25 + 3.5 n MHzupper half of band: fn= f0+ 13.75 + 3.5 n MHzwhere n = 1, 2, 3, . 6;3 th
17、at where the band 1 350-1 400 MHz is not available for the FS and where the introduction of new MS, MSSand/or BSS limits the FS to the band 1 427-1 452 MHz paired with the band 1 492-1 517 MHz(Note 1), a radio-frequency channel arrangement with up to twelve go and return channels is used (carrier sp
18、acing of 2 MHz), which isderived as follows:Let f0be the band centre frequency of 1 472 MHz,fnbe the centre frequency of a radio-frequency channel in the lower half of the band,fnbe the centre frequency of a radio-frequency channel in the upper half of the band,DS (Tx/Rx duplex spacing) = 65 MHz,the
19、n the frequencies of individual channels with a carrier spacing of 2 MHz are expressed by the following relationships:lower half of band: fn= f0 45.5 + 2 n MHzupper half of band: fn= f0+ 19.5 + 2 n MHzwhere n = 1, 2, 3, . 12.For lower carrier spacings, the frequencies of individual channels are expr
20、essed by the following relationships:Carrier spacing of 1 MHz:lower half of band: fn= f0 45 + 1 n MHzupper half of band: fn= f0+ 20 + 1 n MHzwhere n = 1, 2, 3, . 24.Carrier spacing of 0.5 MHz:lower half of band: fn= f0 44.75 + 0.5 n MHzupper half of band: fn= f0+ 20.25 + 0.5 n MHzwhere n = 1, 2, 3,
21、 48.Carrier spacing of 0.25 MHz:lower half of band: fn= f0 44.625 + 0.25 n MHzupper half of band: fn= f0+ 20.375 + 0.25 n MHzwhere n = 1, 2, 3, . 96.4 Rec. ITU-R F.1242Channel arrangements with lower carrier spacings are possible by means of further channel subdivision.A radio-frequency channel arr
22、angement with carrier spacing of 3.5 MHz can be accommodated with up to seven go andreturn channels, the frequencies of individual channels being expressed by the following relationships:lower half of band: fn= f0 46.5 + 3.5 n MHzupper half of band: fn= f0+ 18.5 + 3.5 n MHzwhere n = 1, 2, 3, . 7.NOT
23、E 1 Prior to WARC-92, the band 1 427 to 1 530 MHz has been reported to be used for small capacity analogueand digital systems with a radio-frequency channel arrangement based on a carrier spacing of 0.5 MHz. The frequenciesof individual channels are expressed by the following relationships:lower half of band: fn= f0 51.5 + 0.5 n MHzupper half of band: fn= f0+ 14 + 0.5 n MHzwhere:f0= 1 478.5 MHzn = 1, 2, 3, 74._
