1、 CEPT CEPT/ERC/REC L2-02aE 94 2326414 0032989 475 CEPTIERCIREC 12-02 E Page 1 Distribution: i3 CEPT/ERC/RECOMMENDATION 12-02 E (Bonn 1994) HARMONISED RADIO FREQUENCY CHANNEL ARRANGEMENTS FOR ANALOGUE AND DIGITAL TERRESTRIAL FIXED SYSTEMS OPERATING IN THE BAND 12.75 GHz TO 13.25 GHz Recominendation p
2、roposed by the Working Group “Spectrum Engineering” (WGSE) Text of the recommendation adopted bjj the “European Radiocoininunications Committee” (ERC): “The European Conference of Postal and Telecommunications Administrations, considering 1. 2. 3. 4. 5. that CEPT should develop radio frequency chann
3、el arrangements in consultation with organisations developing standards for radio systems, in order to make the most effeciive use of the spectrum available, that the propagation characteristics of the band 12.75 GHz to 13.25 GHz are ideally suited to medium- range high grade digital fixed systems,
4、that the anticipated developnients in telecommunications networks will require large numbers of medium- range links in the supporting infrastructure, that a number of new or existing systems could operate successfully in the band 12.75 GHz to 13.25 GHz thus relieving congestion and reducing the dema
5、nd for spectrum in the lower frequency bands, that any radio frequency channel arrangement should incorporate a provision for the future introduction of improved equipment standards, noting that Article 8 of the Radio Regulations allocates the band 12.75 GHz to 13.25 GHz on an equal primary basis to
6、 the Fixed, Fixed Satellite and Mobile services. Sharing criteria between Fixed and Mobile, and Fixed and Fixed Satellite services may be required, that in some CEPT countries there are existing fixed systems in the band 12.75 GIiz to 13.25 GHz which are not operating in accordance with the channel
7、arrangement given in Annex A, in particular the 3.5 MHz raster is used with a 1.75 MHz shift with respect to that shown in Annex A, that in some CEPI countries the band 12.75 CiHz to 13.25 GHz is currently unavailable for the Fixed Service, that current equipment stanclards support a 1.75 MHz raster
8、 Edition of Aiigust 26, 1096 CEPTIERCIREC 12-02 E Page 2 recommenh 1. 2. 3. 4. that CEPT Administrations which have the band 12.75 GHz to 13.25 GHz available for the Fixed Service should follow the recommended radio frequency channel arrangements for the band 12.75 GHz to 13.25 GHz given in Annex A
9、 that in order to obtain maximum spectrum utilisation, the centre gap and guard bands may be used for a variety of low capacity systems, provided that the limits for out-of band emissions are met, that administrations may choose to allow existing systems to remain in the band 12.75 GHz to 13.25 GHz
10、 until the year 2008, and may determine, on a national basis, the degree of protection given. International coordination between existing and new systems shall be in accordance with Article 12 of the Radio Regulations, that one or more 28 MHz channels can be sub-divided for low capacity digital syst
11、ems according to Annex A.” Edition of August 26, 1996 CEPT CEPT/ERC/REC L2-02*E 94 9 2326434 OOL299L 023 9 CEPTIERCIREC 12-02 E Annex A, Page 1 Annex A 1. DERIVATION OF PROPOSED FREQUENCY CHANNELS Let fo be the frequency of I2996 MHz as given in ITU-R Recommendation 497, Recommends 9, fn be the cent
12、re frequency in MHz of a radio-frequency channel in the lower half of the band, fn be the centre frequency in MHz of a radio-frequency channel in the upper half of the band, then the frequencies of the individual channels are expressed by the following relationships: where n = 1, 2, . 16 for systems
13、 with a carrier spacing of 28 MHz: lower half othe band: upper half of the band: for systems with a carrier spacing of 14 MHz: lower half of the band: upper half of the band: for systems with a carrier spacing of 7 MHz: lower half of the band: upper half of the band: for systems with a carrier spaci
14、ng of 3.5 MHz: lower half of the band: upper half of the band: for systems with a carrier spacing of I .75 MHz: lower half of the band: upper half of the band: fn T= fo - 259 + 28 n fn = fo + 7 + 28 n where n = I, 2, . 8 fn = fo - 252 + 14 n fn-fo+ I4+ 1411 fn = fo - 248.5 + 7 n fn = fo + 17.5 + 7 n
15、 where n = 1,2, . 32 fn = fo - 246.75 + 3.5 11 fn = fo + 19.25 + 3.5 II where n = I, 2, . 64 fn -2 fo - 245.875 + 1.75 n fil = fo - 20.125 + 1.75 il where n = 1,2, . 128 Edition of August 26, 1996 CEPT CEPT/ERC/REC 12-02*E 94 m 2326434 O012992 TbT m CEPTIERCIREC 12-02 E Annex A, Page 2 Figure 1 : Ra
16、dio-frequency channel arrangement using 28 MHz channel spacing 12750 MHz I 13250 MHz : 123 45 678 1 23 45 678 I I I I I e 70 MHz Figure 2: Examples of radio-frequency channel arrangements sub-divided for smaller capacity digital systems (a) Sub-division of 28 MHz channels to 14 MHz, 7 MHz and 3.5 MHz channels 1 2 3 4 5 6 7 8 i 1 2 3 4 5 6 7 8 *. . *. *. *. ,.* , 14 MHz channels 3.5 MHz channels . . ,. *. a ., . *. (b) Further sub-division to 1.75 MHz channels 12345678 (3.5 MHz channels I Edition of August 26, 1996
