1、CEPT/ERC/REC 12-10 Page 1 Distribution: B CEFT/ERC/RECOMMENDATION 1210 (The Hague 1998) HARMOMSED RADIO FREQUENCY ARRANGEMENTS FOR DIGITAL SYSTEMS OPERATING IN THE BAND 48.5 GHz - 50.2 GHz Recommendation proposed by the Working Group “Spectrum Engineering“ (WGSE) Text of the Recommendation adopted b
2、y the “European Radiocommunications Committee“ (ERC): The European Conference of Post and Telecommunications Administrations, considering that CEPT should develop radio frequency channel arrangements in consultation with organisations developing standards for radio systems, in order to make the most
3、 effective use of the spectrum available; that the propagation characteristics of the band 48.5GHz - 50.2 GHz are ideally suited to short range low and medium capacity digital fixed system; that the anticipated developments in telecommunications networks will require large numbers of short range lin
4、ks in the supporting infrastructure; 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 allocates the band 48.9s“ - 50.2 GHz on an equal primary basis to the Fixed
5、, Fixed-Satellite and Mobile services. Sharing cntena 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 48.9GHz - 49.04 GHz to the Radio Astronomy Service on a primary basis for spectral li
6、ne 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 provides guidance on sharing between the radio astronomy and fixed services operati
7、ng within EuropeThe 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 observatory; c) that in some CEPT countries there are existing fixed systems that operat
8、e in bands contained within the band 48.5 GHz - 50.2 GHz on national channel arrangements and are not operating in acordance with the channel arrangements given in theAnnex A; d) in some CEPT countries the band 48.5GHz - 50.2 GHz is not currently available for the Fixed Service. This Recommendation
9、superseed Recommendation 12-04 E (Stockhoim 1995) Edition of 30 October 1998 STD-CEPT CEPT/ERC/REC 32-10 E-ENGL 1996 W 2326434 0034833 325 = C!JIPTIJCRUREC 12-10 Page 2 recommends 1) that CEPT Administrations which have the band 48.XHz - 50.2GHz available for the Fixed Service should follow the reco
10、mmended radio frequency arrangements for the band 48.8Hz - 50.2 GHz given in Annex A, 2) that CEPT Administrations which have existing fixed service systems operating within the band 48Wz - 50.2 GHz, not in accordance with recommends 1, may allow these systems to remain until the year 2008 and may d
11、etermine 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 Radio Regulations. Edition of 30 October 1998 STD-CEPT CEPT/ERC/REC 12-10 E-ENGL 1998 2326414 0014834 261
12、 9 CEPT/ERCJREC 1210 Page 1 Annex A ANNEX A DERIVATION OF RADIO FREQUENCY CHANNELS The radio frequency channel arrangement for channel separations of 21MHz, 14 MHz, 7 MHz and 3.5 MHz shall be derived as follows: Let fr fn fn TXRX separation = 884 MHz, be the reference frequency of 49350 MHz (14100 x
13、 3.SMHz), be the centre frequency (MHz) of the radio-frequencyhmel in the lower half of the band, be the centre frequency (MHz) of the radio-frequency channel in the upper half of the band, Band separation - 100 MHz, then the frequencies (MHz) of individual channels are expressed by the following re
14、lationships: 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 wheren= 1,2, 3, . 28 b) for systems with a channel separation of 14 MHz: lower half of the band upper half of the band fn= fr - 841 + 14 n fn=fr+43
15、+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 wheren= 1,2, 3, . 56 wheren= 1,2, 3, . 112 d) for systems with a channel separation of 3.5 MHz: lower half of the band upper half of the band fn = fr - 835.75
16、 + 3.5 n fn= fr + 48.25 + 3.5 n wheren=l,2, 3, . 224 Edition of 30 October 1998 STD-CEPT CEPT/ERC/REC 12-10 E-ENGL 1978 232b414 0014835 1TB m CEPTIERCIREC lf10 Page 2 Annex A Calculated parameters according to ITU-R Rec. 746 TABLE 1 XS YS Z1S ZZS DS Separation between centre frequencies of adjacent
17、channels Separation between centre frequencies of the closest go and return channels Separation between the lower band edge and the centre frequency of thfirst channel Separation between centre frequencies of the final channel and the upper band edge Duplex spacing (fi - fn) Edition of 30 October 19
18、98 STD-CEPT CEPT/ERC/REC 12-10 E-ENGL 1998 W 232b414 001483b 034 CEPTERUREC 1210 Page 3 Annex A Occupied spectrum: 48.5 to 502 GHz Band TABLE 2 a) 28 MHz channels (3.5 MHz x 8) Guard band Centre gap Guard band 16 MHz 100 MHz 16 MHz b) 14 MHz channels (3.5 MHz x 4) Guard band Centre gap Guard band 16 MHz loo MHZ 16 MHz c) 7 MHz channels (3.5 MHz x 2) Guard band 16 MHz Centre gap 100 MHz Guard band 16 MHz d) 3.5 MHz channels (3.5 MHz x 1) Guard band 16 MHz Centre gap 100 MHz Guard band 16 MHZ 48.5 GHz 49.3 GHz 49.4 GHz 50.2 GHz Edition of 30 October 1998
