1、 CEPT CEPT/ERC/REC 32-04*E 95 2326434 0032997 543 CEPTIERCIREC 12-04 E Page 1 Distribution: B CEPT/ERC/RECOMMENDATION 12-04 E (Stockholm 1995) HARMONISED RADIO FREQUENCY CHANNEL ARRANGEMENTS FOR DIGITAL TERRESTRIAL FIXED SYSTEMS OPERATING IN THE BAND 48.5 GHz - 51.4 GHz Text of the recommendation ci
2、dopted by Working Group “Spectrum Engineering” (WGSE): “The European Conference of Post and Telecommunications Administrations, considering 1. that CEPT should develop radio. frequency channel arrangements in consultation with organisations developing standards for radio systems, in order to make th
3、e most effective use of the spectrum available, 2. that the propagation characteristics of the band 48.5 GHz - 51.4 GHz are ideally suited to short range low and medium capacity digital fixed systems, 3. that the anticipated developments in telecommunications networks will require large numbers of s
4、hort range links in the supporting infrastructure, 4. that any radio frequency channel arrangement should incorporate a provision for the future introduction of improved equipment standards, noting Article 8 of the Radio Regulations allocates the band 48.5 GHz - 50.2 GHz on an equal primary basis to
5、 the Fixed, Fixed-Satellite arid Mobile services. Sharing criteria between Fixed and Mobile, and Fixed and Fixed-Satellite services may be required, Article 8 of the Radio Regulations allocates the band 50.2 GHz - 50.4 GHz on an equal primary basis to the Fixed, Earth Exploration Satellite (passive)
6、, Mobile and Space Research (passive) services, Sharing criteria between Fixed and Mobile, Fixed and Earth Expl.oration Satellite (passive), and Fixed and Space Research (passive) services are required, Article 8 of the Radio Regulations allocates the band 50.4 GHz - 5 1.4 GHz on an equal primary ba
7、sis to the Fixed, Fixed-Satellite and Mobile services, Sharing criteria between Fixed and Mobile, and Fixed and Fixed-Satellite services may be required, Article 8 of the Radio Regulations footnote 904 allocates the band 48.94 GHz - 49.04 GHz to the Radio Astronomy Service on a primary basis for spe
8、ctral line observations. In making assignments to stations of other services in this band, administrations are urged to take all practical steps to protect the Radio Astronomy Service from harmful interference. Co-ordination studies will be required to determine the appropriate method to be used, In
9、 some CEPT countries there are existing fixed systems that operate in bands contained within the band 48.5 GHz - 51.4 Gi-lz on national channel. arrangements and are not operating in accordance with the channel arrangements given in the Annex A, In some CEPr countries the band 48.5 GHz - 5 1.4 GHz i
10、s not currently available for the Fixed Service, Edition of August 26, 1996 CEPT CEPT/ERC/REC L2-04xE 95 2326939 0032998 488 CEPTIERCIREC 12-04 E Page 2 recommends that CEPT Administrations which have the band 48.5 GHz - 51.4 GHz available for the Fixed Service should follow the recommended radio fr
11、equency arrangements for the band 48.5 GHz - 5 1.4 GHz given in Annex A, that administrations that have existing systems operating within the band 48.5 GHz - 5 1.4 GHz may allow these systems to remain until the year 2008 and may determine on a national basis, the degree of protection given. Any int
12、ernational co-ordination that may be required between existing and new systems shall be in accordance with Article 12 of the Radio Regulations, that CEPT Administrations do not use the sub-band 50.2 GHz - 50.4 GHz as it is not considered possible to share with the proposed EESS.” Edition of August 2
13、6, 1996 CEPT CEPT/ERC/REC 32-04*E 95 2326434 0032999 314 CEPTIERCIREC 12-04 E Annex A, Page 1 Annex A I. DERIVATION OF RADIO FREQUENCY CHANNELS The radio frequency channel arrangenient for carrier spacings of 28 MHz, 14 MHz, 7 MHz and 3.5 MHz shall be derived as follows: Let fr fn fn be the referenc
14、e frequency of 49952 MHz (I 4272 x 3.5 MHz), be the centre frequency (Mfkz) of the radio-frequency channel in the lower half of the band, be the centre frequency (MHz) of the radio-frequency channel in the upper half of the band, then the frequencies (MHz) of individual channels are expressed by the
15、 following relationships: for systems with a carrier spacing of 28 MHz: lower half of the band: upper half of the band: fii=fr- 1449+28n fn = fr + 21 t 28 n for systems with a carrier spacing of 14 MHz: lower half of the band: upper half of the band: %=fr- 1442+ 14n fn=fr+28+ 14n for systems with a
16、carrier spacing of 7 MHz: lower half of the band: upper half of the band: fn = fr - 1438.5 +- 7 n fi = fr + 31.5 + 7 n for systems with a carrier spacing of 3.5 MHz: lower half of the band: upper half of the band: fn -: fr - 1436.75 + 3.5 n fn = fr -t 33.25 i- 3.5 n where n = i, 2,3, . 50 where n =
17、i, 2,3, . 100 where n = I, 2,3, . 200 where n = 1,2,3, . 400 Editiori of Aiigiist 26. 1 )9h CEPT CEPT/ERC/REC L2-O4*E 95 2326414 OOL3000 734 CEPTIERCIREC 12-04 E Annex A, Page 2 Table 1 : Calculated parameters according to ITU-R Rec. 746 XS YS Z 1 S Z2S DS Separation between centre frequencies of ad
18、jacent channels Separation between centre frequencies of the closest go and return channels Separation between the lower band edge and the centre frequency of the first channel Separation between centre frequencies of the final channel and the upper band edge Duplex spacing (f n - fn) Edition of Aug
19、ust 26, 1996 CEPT CEPT/ERC/REC 12-04*E 95 2326414 0013001 670 CEPTIERCIREC 12-04 E Annex A, Page 3 Table 2: Occupied spectrum: 48.5 to 51.4 GHz Band a) 28 MHz channels (3.5 MHz x 8) Guard band 17 MHz Guard band 70 MHz Guard band 13 MHz b) i4 MHz channels (3.5 MHz x 4) Guard band 17 MHz Guard band 70
20、 MHz Guard band 13 MHz c) 7 MHz channels (3.5 MHz x 2) Guard band 17 MHz Guard band 70 MHz Guard band 13 MHz d) 3.5 MHz channels (3.5 MHz x i) Guard band 17 MHz Guard band 70 MHz Guard band i3 MHz 48.5 GHz 43.917 GHz 49.987 GHz 5 I .4 GHz Notes: 1. The sub-band 50.2 - 50.4 GHz is not used due to lhe EESS use of tliis band and its inability to share with the 1;s. The stili-band 48.73 - 48.93 GHz is not used due to the reverse tiequencies being used for EESS. The sub-band 48.73 - 48.93 GHz could be used for unidirectional links. 2. 3. Idition ot August 26, 1996
