1、 Rec. ITU-R F.1496-1 1 RECOMMENDATION ITU-R F.1496-1 Radio-frequency channel arrangements for fixed wireless systems operating in the band 51.4-52.6 GHz (Question ITU-R 108/9) (2000-2002) The ITU Radiocommunication Assembly, considering a) that the band 51.4-52.6 GHz is allocated to the fixed and mo
2、bile services on a primary basis; b) that No. 5.547 of the Radio Regulations (RR) identifies the 51.4-52.6 GHz band as being available for high-density applications in the fixed service (FS); c) that ITU-R should develop radio-frequency channel arrangements in order to make the most effective use of
3、 the spectrum available; d) that the propagation characteristics of the 51.4-52.6 GHz band are ideally suited for use of short-range digital point-to-point radio links in high-density applications in the FS networks; e) that in the frequency range a high antenna directivity is achievable even with s
4、mall size antennas, increasing the density of equipment and further reducing risk of interference with same and other radio services; f) that differing applications licensed by various administrations may require different radio-frequency channel arrangements; g) that the applications in this freque
5、ncy band may require differing channel bandwidths; h) that several radio services with various transmission signal characteristics and capacities may be in simultaneous use in this frequency band; j) that a high degree of compatibility between radio-frequency channels of different arrange-ments can
6、be achieved by selecting channel centre frequencies within a homogeneous basic pattern, recommends 1 that administrations should consider the channel arrangement given in Annex 1 for FS system deployment in the frequency range 51.4-52.6 GHz. 2 Rec. ITU-R F.1496-1 ANNEX 1 Radio-frequency channel arra
7、ngement in the band 51.4-52.6 GHz The radio-frequency channel arrangement for channel separations of 56 MHz, 28 MHz, 14 MHz, 7 MHz and 3.5 MHz shall be derived as follows: Let rf be the reference frequency of 51 412 MHz, nf be the centre frequency (MHz) of the radio-frequency channel in the lower ha
8、lf of the band, nf be the centre frequency (MHz) of the radio-frequency channel in the upper half of the band, Tx/Rx separation = 616 MHz, band separation = 112 MHz, then the frequencies (MHz) of individual channels are expressed by the following relationships: a) for systems with a channel separati
9、on of 56 MHz: lower half of the band: nf = fr+ 56 n upper half of the band: nf = fr+ 616 + 56 n where: n = 1, 2, 9 b) for systems with a channel separation of 28 MHz: lower half of the band: nf = fr+ 14 + 28 n upper half of the band: nf = fr+ 630 + 28 n where: n = 1, 2, 3, 18 c) for systems with a c
10、hannel separation of 14 MHz: lower half of the band: nf = fr+ 21 + 14 n upper half of the band: nf = fr+ 637 + 14 n where: n = 1, 2, 3, 36 d) for systems with a channel separation of 7 MHz: lower half of the band: nf = fr+ 24.5 + 7 n upper half of the band: nf = fr+ 640.5 + 7 n where: n = 1, 2, 3, 7
11、2 Rec. ITU-R F.1496-1 3 e) for systems with a channel separation of 3.5 MHz: lower half of the band: nf = fr+ 26.25 + 3.5 n upper half of the band: nf = fr+ 642.25 + 3.5 n where: n = 1, 2, 3, 144. ANNEX 2 TABLE 1 Calculated parameters according to Recommendation ITU-R F.746 XS (MHz) n f1(MHz) fnmax(
12、MHz) 1f (MHz) nmaxf (MHz) Z1S (MHz) Z2S (MHz) YS (MHz) DS (MHz) 56 1, . 9 51 468 51 916 52 084 52 532 68 68 168 616 28 1, . 18 51 454 51 930 52 070 52 546 54 54 140 616 14 1, . 36 51 447 51 937 52 063 52 553 47 47 126 616 7 1, 72 51 443.5 51 940.5 52 059.5 52 556.5 43.5 43.5 119 616 3.5 1, 144 51 44
13、1.75 51 942.25 52 057.75 52 558.25 41.75 41.75 115.5 616 XS: separation between centre frequencies of adjacent channels YS: separation between centre frequencies of the closest go and return channels Z1S: separation between the 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 ).(nnff
