1、STD*CEPT CEPT/ERC/REC 12-06 E-ENGL Lq7b W 2326414 0014837 T70 W CEPT/ERC/REC 12-08 E Page 1 Distribution: B CEPTIERURECOMMENDATION 12-06 E (Rome 1996) HARMONISED RADIO FREQUENCY CHANNEL ARRANGEMENTS FOR DIGITAL TERRESTRIAL FIXED SYSTEMS OPERATING IN THE BAND 10.7 - 11.7 GHz Text of the recommendatio
2、n adopted by the Working Group “Spectnun Engineering” (WG SE): The European Conference of Postai and Telecommunications Administrations, considering 1. 2. 3. 4. 5. that CEP” has a long-term objective to harmonise the use of frequencies throughout Europe, that CEPT should develop radio frequency chan
3、nel arrangements in order to make the most effective use of the spectrum available, that digital systems with a capacity of up to 4 x 140 MbiVs or the equivalent synchronous digital hierarchy bit rates seem to be feasible, that there exists within the ITU-R the Recommendation F.387 which gives chann
4、el arrangements for this band, that the main channel plan in ITU-R Recommendation F.387-6 extends beyond the limits of this band, noting 1. that ITU Radio Regulation 8 Footnote 833 states that ail emissions in the band 10.68 - 10.7 GHz are prohibited except for those provided for by Radio Regulation
5、 8 Footnote 834, recommends 1. that for future allocations in the 10.7 - 11.7 GHz band, the preferred radio frequency channel arrangement for digital radio relay systems with a capacity of 140 MbiVs, 155 MbiVs or 622 MbiVs, and operating in the 11 GHz band should be derived as follows: let fo be the
6、 frequency of the centre of the band of frequencies occupied (MHz); and fn be the centre frequency of a radio frequency channel in the lower half of the band (MHz); and f be the centre frequency of a radio frequency channel in the upper half of the band (MHZ); then the frequencies (MHz) of individua
7、l channels are expressed by the following relationships: Jhwer half of the band Upper half of band f, = (fo - 505 + 40 n) MHz f,= (fo + 25 + 40n) MHz wheren= 1,2, 3,4,5,6,7,8,9, 10, or 11 as shown in Figure 1, andfo= 11 200MHz 2. that if multi-carrier transmission (Note 1) is employed, a block of n
8、channels will be used together. Although there will be one carrier operating in each of these channels, the carrier frequencies will not necessarily align, for technical reasons, with the centre frequencies of the channel. Operation of muiti- carrier systems is addressed in greater detail in Annex A
9、, EditionofNovember 12,1996 STD.CEPT CEPT/ERC/REC 32-Ob E-ENGL 3996 = 2326434 0014838 907 I CEPT/ERC/REC 12-06 E Page 2 3. that if greater spectral efficiency is required, the preferred radio frequency channel arrangement providing 12 go and return channels is based on 9 1 above with two additional
10、channels. The frequencies (MHz) of the individual channels are expressed by the following relationships: Lower half of the band Upper half of the band wheren= 1, 2, 3,4, 5,6, 7,8,9, 10, 11 or 12 as shown in Figure 2.“ f, = (fo - 505 + 40 n) MHz f, = (fo - 15 + 40 n) MHz andfo= 11 200MHz NOTE 1: A mu
11、lti-carrier system is a system with n (where n i) digitally modulated carrier signals simultaneously transmitted (or received) by the same radio frequency equipment. The centre frequency should be regarded as the arithmetic average of the n individual carrier frequencies of the multi-carrier system.
12、 TABLE 1: Calculated parameters according to ITU-R Rec. F.746 In Ill I12 I If1 /m I10735 I10735 I If11 /MHz I11135 I11135 I If171 hf& I I11175 I If1 /m I 11265 I 11225 I If, /MHZ I 11665 I 11625 I IflJMHz I I 11665 I 121s / MHZ I35 I IYS/MHz I130 I IDSIMHz I530 I490 I FIGURE 1 II 10700MIIz 10715MHz
13、I I 11155 MHz 11245 MHZ II 11685MHz 11700MHz FIGURE 2 II II 11195 MHz 11205 MHz II Edition of November 12,1996 STD-CEPT CEPT/ERC/REC 12-06 E-ENGL 1996 2326434 0034839 843 m CEPTIERCIREC 12-06 E Annex A, Page 1 Annex A DESCRIPTION OF A MULTI-CARRIER SYSTEM A multi-carrier system is a system with n (w
14、here n 1) digitally modulated carrier signals simultaneously transmitted (or received) by the same radio frequency equipment. An example of a mpolar channel arrangement using a two-carrier system with 64 QAM is shown below. The channel arrangement depicted in Figure 3 is based upon the use of a two-
15、carrier system transmitting 2 x 2 x 155 Mbit/s (STM-1) or 1 x 622 Mbis (STM-4) via twcarrier pairs using both polarisations in the CD. channel arrangement. FIGURE 3 10755 10835 10915 10995 11075 11285 11365 11445 11525 11605 An example of a radio frequency arrangement for a 2 x 2 x 155 Mbit/s (STM-1) or 1 x 622 Mbis (STM-4) radio relay system operating with 80 MHz channel spacing in the 10.7 - 11.7 GHz band, as used in Switzerland. EditionofNovember 12,1996
