1、CEPTIERCIREC 12-12E Page i Distribution: B CEPTERC RECOMMENDATION 12-12 E (Luxembourg) RADIO FREQUENCY CHANNEL ARRANGEMENT FOR FIXED SERVICE SYSTEMS OPERATING IN THE BAND 55.78 - 57.0 GHz Recommendation adopted by the Working Group “Frequency Management“ (WGFM): “The European Conference of Postal an
2、d 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 the most effective use of the spectrum available; that the propagation characteristics of the
3、 55.78 - 57.0 GHz are ideally suited for use of short range digital radio links in high density networks; 2) noting that Radio Regulations allocate the band 55.78 - 57.0 GHz on a primary basis for Earth Exploration Satellite (passive), Fixed, Inter-Satellite, Mobile and Space Research (passive) serv
4、ices; that in the frequency range a high antenna directivity is achievable even with small size antennas, increasing the density of equipment and further reducing risk of interference with same and other services; that differing applications licensed by various administrations may require different
5、radio-frequency channel arrangements; that the applications in this frequency band may require differing channel bandwidths; that several services with various transmission signal characteristics and capacities may be in simultaneous use in this frequency band; that a high degree of compatibility be
6、tween radio-frequency channels of different arrangements can be achieved by selecting channel centre frequencies within a homogeneous basic pattern; that the low end of the frequency band is suitable for the longest hop radio links because the atmospheric attenuation is less than at the top of the b
7、and; recommends 1) that the CEPT Administrations should follow the recommended channel arrangements for time division duplex (TDD) systems in the frequency range 55.78 - 57.0 GHz given in Annex A; 2) that the CEPT Administrations should follow the recommended channel arrangements for frequency divis
8、ion duplex (FDD) systems in the frequency range 55.78 - 57.0 GHz given in Annex B. CEPT/ERCIREC 12-12 E Page 2 xs MHz 56 28 14 ANNEX A n fl fn ZlS z2s 1, . 20 55870 56934 90 66 1, . 40 55856 56948 76 52 1, -80 55849 56955 69 45 MHz MHz MHz MHz RADIO-FREQUENCY CHANNEL ARRANGEMENTS IN THE BAND 55.78 -
9、 57.0 GHz FOR SYSTEMS USING TDD Let fi be the reference frequency of 55786 MHz, fn be the centre frequency of a radio-frequency channel in the band 55.78 - 57.0 GHz, then the centre frequencies of individual channels are expressed by the following relationships: a for systems with a channel separati
10、on of 56 MHz: MHz where: fn =fr+ 28 +56 n n = 1, 2, 3, . 20 b) for systems with a channel separation of 28 MHz: MHz where: fn = fr+ 42 + 28 n n = 1, 2, 3, . 40 c) for systems with a channel separation of 14 MHz: fn=fr+49+ 14n MHz where: n = 1, 2, 3, . 80 Calculated parameters according to ITU-R Rec.
11、 746 XS ZlS 22s Separation between centre frequencies of adjacent 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 CEPTIERCIREC 12-12E Page 3 ANNEX A Figure 1 Occupied spec
12、trum: 55.78 to 57 GHz Band a) 56 MHz channels Guard band Guard band 62 MHz 38 MHz 55.78 GHz 57.0 GHz 55.842 GHz 56.962 GHz b) 28 MHz channels Guard band 38 MHz Guard band 62 MHz 55.78 GHz 57.0 GHz 55.842 GHz 56.962 GHz c) 14 MHz channels Guard band Guard band 62 MHz 38 MHz 55.78 dHz 55.842 GHz 57.0
13、GHz 56.962 GHz .STD*CEPT CEPTIERCIREC 12-12 E-ENGL 232b414 IJLb132 T7 W CEPTIERCIREC 12-12 E Page 4 ANNEX B Radio-frequency channel arrangement in the band 55.78 - 57 GHz for systems using FDD The radio frequency channel arrangement for channel separations of 56 MHz, 28 MHz and 14 MHz shall be deriv
14、ed as follows: Let frbe the reference frequency of 55814 MHz, fn 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, fn TX/RX separation Band separation - 616 MHz, 1 12
15、 MHz, - - then the frequencies (MHz) of individual channels are expressed by the following relationships: a) for systems with a channel separation of 56 MHz: lower half of the band: fn= fr + 56 n upper half of the band: fn = fr + 616 + 56 n wheren= 1,2, . 9 b) for systems with a channel separation o
16、f 28 MHz: lower half of the band: upper half of the band: fn=fr+ 14+28n fn = fr + 630 + 28 n where n = 1, 2, 3, . 18 c) for systems with a channel separation of 14 MHz: lower half of the band: upper half of the band: fn = fr + 21 + 14 n fn = fr + 637 + 14 n where n = 1, 2, 3, . 36 STDmCEPT CEPT/ERC/
17、REC 12-12 Ea-ENGL. 232b41i4 0ULbL33 833 = CEPTIERCIREC 12-12E Page 5 ANNEX B Table 1 Calculated parameters according to ITU-R Rec. 746 XS Separation between centre frequencies of adjacent channels YS Separation between centre frequencies of the closest go and return channels Z1S Separation between t
18、he lower band edge and the centre frequency of the first channel Z2S Separation between centre frequencies of the final channel and the upper band edge DS Duplex spacing (f n - fn) STD*CEPT CEPT/ERC/REC 12-12 E-ENGL S32bllll ULib13LI 77T H CEPTIERCIREC 12-12 E Page U ANNEX B Figure 1 Occupied spectr
19、um: 55.78 to 57 GHz Band a) 56 MHz channels Guard band Centre gap Guard band 62 MHz I12 MHz 38 MHz 55.78 GHz 56.346 56.458 57.0 GHz 55.842 GHz 56.962 GHz b) 28 MHz channels Guard band Centre gap Guard band 62 MHz 112 MHz 38 MHz 55.78 GHz 55.842 GHz 56.346 56.458 57.0 GHz 56.962 GHz c) 14 MHz channels Guard band Centre gap Guard band 62 MHz 1 12 MHZ 38 MHz 55.78 GHz 55.842 GHz i6.346 56. 458 57.0 GHz 56.962 GHz
