1、STD-CEPT CEPT/ERC/REC L2-10-ENGL 1798 2326434 00L35bb L3L M CEPTIERCIREC 12-10 Pase i Distribution: 6 CEPT/ERC/RECOMMENDATION 12-10 (The Hague 1998) HARMONISED RADIO FREQUENCY ARRANGEMENTS FOR DIGITAL SYSTEMS OPERATING IN THE BAND 48.5 GHz - 50.2 GHz Recommendation proposed by the Working Group “Spe
2、ctrum Engineering“ (WGSE) Text of the Recommendation adopted by the “European Radiocommunications Committee“ (ERC): The European Conference of Post and Telecommunications Administrations, considering 1. that CEPT should develop radio frequency channel arrangements in consultation with organisations
3、developing standards for radio systems, in order to make the most effective use of the spectrum available; 2. that the propagation characteristics of the band 48.5 GHz - 50.2 GHz are ideally suited to short range low and medium capacity digital fixed systems; 3. that the anticipated developments in
4、telecommunications networks will require large numbers of short 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 a) that Article S5 of the Radio Regulations
5、 allocates the band 48.5 GHz - 50.2 GHz on an equal primary basis to the Fixed, Fixed-Satellite and Mobile services. Sharing criteria between Fixed and Mobile, and Fixed and Fixed-Satellite services may be required; b) that Article S5 of the Radio Regulations footnote S5.555 allocates the band 48.94
6、 GHz - 49.04 GHz to the Radio Astronomy Service on a primary basis for spectral 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. ERC-Report 36 p
7、rovides guidance on sharing between the radio astronomy and fixed services operating within Europe. The report states that a co- ordination zone with a 50 km radius should be suitable to protect the radio astronomy service in most European countries depending on the local terrain around a radio obse
8、rvatory; c) that in some CEPT countries there are existing fixed systems that operate in bands contained within the band 48.5 GHz - 50.2 GHz on national channel arrangements and are not operating in accordance with the channel arrangements given in the Annex A; d) in some CEPT countries the band 48.
9、5 GHz - 50.2 GHz is not currently available for the Fixed Service. Ihis Kccommcridation cupercccd Iccornmcndation i 7-OJ 1: 1 Stockholm 1995) I Ediiion of ?O October 1998 STD*CEPT CEPT/ERC/REC 32-LO-ENGL 3998 = 2326434 0033567 078 CEPTIE RCiREC 1 2- 1 O Page 2 recommends 1) that CEPT Administrations
10、 which have the band 48.5 GHz - 50.2 GHz available for the Fixed Service should follow the recommended radio frequency arrangements for the band 48.5 GHz - 50.2 GHz given in Annex A; 2) that CEPT Administrations which have existing fixed service systems operating within the band 48.5 GHz - 50.2 GHz,
11、 not in accordance with recommends 1, may allow these systems to remain until the year 2008 and may determine on a national basis, the degree of protection given. Any international Co-ordination that may be required between existing and new systems shall be in accordance with Article S11 of the Radi
12、o Regulations. Edition of 30 October 1998 STD-CEPT CEPT/ERC/REC 12-LO-ENGL 1998 2326414 0033568 “04 CEPTERCIREC 12-10 Page I Annex A ANNEX A DERIVATION OF RADIO FREQUENCY CHANNELS The radio frequency channel arrangement for channel separations of 28 MHz, 14 MHz, 7 MHz and 3.5 MHz shall be derived as
13、 follows: Let fr fn fn be the reference frequency of 49350 MHz (14100 x 3.5 MHz), be the centre frequency (MHz) 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, 884 MHz, 1 O0 MHz, - TX/RX separat
14、ion Band separation - then the frequencies (MHz) of individual channels are expressed by the following relationships: a) for systems with a channel separation of 28 MHz: lower half of the band: upper half of the band: fn = fr - 848 + 28 n fn = fr+ 36 + 28 n b) for systems with a channel separation o
15、f 14 MHz: lower half of the band: upper half of the band: fn=fr-841 + 14n fn=fr+43+ 14n c) for systems with a channel separation of 7 MHz: lower half of the band: upper half of the band: fn = fr- 837.5 + 7 n fn = fr + 46.5 + 7 n d) for systems with a channel separation of 3.5 MHz: lower half of the
16、band: upper half of the band: fn = fi - 835.75 + 3.5 n fn = fi + 48.25 + 3.5 n where n = I, 2, 3, . 28 where n = I, 2, 3, . 56 where n = 1, 2, 3, . 112 where n = 1, 2, 3, . 224 Edition of 30 October 1998 STD.CEPT CEPTIERCIREC 12-10-ENGL 1998 D 2326434 OOL35bq 940 - MHz 48530 CEPTERCREC 12-10 Page 2
17、Annex A MHz MHz MHz 49286 49414 50170 Calculated parameters according to ITU-R Rec. 746 MHz 30 1 ,. 28 MHz MHz MHz 30 128 884 I 14 I 1, . 56 485 17.75 7 p.112 49298.25 49401.75 50182.25 TABLE 1 fl Ifh I fl I fn 17.75 17.75 103.5 884 48523 I 49293 149407 1 -50 1 77 48519.5 149296.5 149403.5 I 50182.5
18、 21s I z2s I YS I DS II I I884 1 23 I23 19.5 19.5 884 XS YS ZIS Z2S DS Separation between centre frequencies of adjacent 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 Separatio
19、n between centre frequencies of the final channel and the upper band edge Duplex spacing (f n - fn) Edition of 30 October 1998 STDICEPT CEPT/ERC/REC 12-LO-ENGL 1998 = 23264114 0013570 662 CEPTIERCIREC 12-10 Page 3 Annex A Occupied spectrum: 48.5 to 50.2 GHz Band TABLE 2 a) 28 MHz channels (3.5 MHz x
20、 8) Guard band 16 MHz Centre gap 1 O0 MHz Guard band 16 MHz 28 x 28 MHz 28 x 28 MHz b) 14 MHz channels (3.5 MHz x 4) Guard band 16 MHz Centre gap 100 MHz Guard band 16 MHz I I 56 x 14 MHz 56 x 14 MHz c) 7 MHz channels (3.5 MHz x 2) Guard band 16 MHz Centre gap 100 MHz Guard band 16 MHz 112 x 7 MHz dj 3.5 MHz channels (3.5 MHz x 1) Guard band 16 MHz Centre gap 100 MHz Guard band 16 MHz 224 x 3.5 MHz I I 48.5 GHz 49.3 GHz 49.4 GHz 50.2 GHz Edition of 30 October 1998
