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Recommendation ITU-R F.386-9(02/2013)

Radio-frequency channel arrangements forfixed wireless systems operating in the8 GHz (7 725 to 8 500 MHz) band

F Series

Fixed service

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ii Rec. ITU-R F.386-9

Foreword

The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of theradio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies withoutlimit of frequency range on the basis of which Recommendations are adopted.

The regulatory and policy functions of the Radiocommunication Sector are performed by World and RegionalRadiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups.

Policy on Intellectual Property Right (IPR)

ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 ofResolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declarations by patentholders are available from http://www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of theCommon Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found.

Series of ITU-R Recommendations

(Also available online at http://www.itu.int/publ/R-REC/en)

Series Title

BO Satellite delivery

BR Recording for production, archival and play-out; film for television

BS Broadcasting service (sound)

BT Broadcasting service (television)

F Fixed service

M Mobile, radiodetermination, amateur and related satellite services

P Radiowave propagation

RA Radio astronomy

RS Remote sensing systems

S Fixed-satellite service

SA Space applications and meteorology

SF Frequency sharing and coordination between fixed-satellite and fixed service systems

SM Spectrum management

SNG Satellite news gathering

TF Time signals and frequency standards emissionsV Vocabulary and related subjects

Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1.

Electronic PublicationGeneva, 2013

ITU 2013

All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU.
http://www.itu.int/ITU-R/go/patents/enhttp://www.itu.int/publ/R-REC/enhttp://www.itu.int/publ/R-REC/enhttp://www.itu.int/ITU-R/go/patents/en

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Rec. ITU-R F.386-9 1

RECOMMENDATION ITU-R F.386-9

Radio-frequency channel arrangements for fixed wireless systems

operating in the 8 GHz (7 725 to 8 500 MHz) band

(Question ITU-R 247/5)

(1963-1966-1982-1986-1992-1997-1999-2007-2013)

Scope

This Recommendation provides radio-frequency channel arrangements for fixed wireless systems operating

in the 8 GHz (7 725 to 8 500 MHz) band, which may be used for high, medium and low capacity systems.

The preferred radio-frequency channel arrangements are based on multiples of basic slots either of 3.5 MHz

or 2.5 MHz width. Examples in various segments of the 8 GHz band are presented in Annexes 1 to 5.

Annex 6 presents an arrangement for high capacity digital systems used in some countries.

The ITU Radiocommunication Assembly,

considering

a) that it may be desirable to be able to interconnect fixed wireless systems (FWSs)

on international links at radio frequencies in the 8 GHz band;

b) that the availability of frequency bands in the range from 7 725 MHz to 8 500 MHz differs

in various countries;

c) that, for some administrations, a frequency band, only 300 MHz wide or less, may be

available in the 8 GHz range for such systems;d) that some channel arrangements have been developed in the past based on analogue system

requirements only;

e) that it is desirable to deploy in such a band digital systems of low, medium and/or high

capacity. In some countries, analogue systems are still being used;

f) that digital systems are mostly designed to accommodate radio-frequency (RF) channel

arrangements based on multiples of 2.5 MHz or 3.5 MHz patterns;

g) that, digital techniques such as cross-polar interference cancellers (XPIC) may significantly

contribute to the cross-polar discrimination improvement factor (XIF, defined in Recommendation

ITU-R F.746), thus counteracting multipath or rain propagation-induced depolarization;

h) that, when very high capacity links (e.g. twice Synchronous Transfer Mode-1 (STM-1)) are

required, further economy may be achieved using system bandwidths wider than the recommended

channel separation, associated to high-efficient modulation formats,

recommends

1 that the preferred RF channel arrangements be based on multiples of basic bandwidths of

either 3.5 MHz or 2.5 MHz; examples in various segments of the 8 GHz band are shown in

Annexes 1 to 5;

2 that, in a section over which the international connection is arranged, all the go channels

should be in one half of the band, and all the return channels should be in the other half of the band;

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2 Rec. ITU-R F.386-9

3 that, for adjacent RF channels in the same half of the band, horizontal and vertical

polarization may be used alternately, as well as co-channel arrangements, provided that sufficient

adjacent channel rejection is provided;

4 that when very high capacity links are required and network coordination permits, with the

agreement of the administrations concerned, the use of any two adjacent 28 or 29.65 MHz channels

specified in recommends 1 is possible, for wider bandwidth system, with centre frequency lying in

the central point of the distance between the two 28 or 29.65 MHz adjacent channels;

5 that due regard be taken of the fact that, in some countries, in the 7 725 MHz to 8 275 MHz

band, another RF channel arrangement for high capacity digital systems up to 140 Mbit/s or

synchronous digital hierarchy bit rates is used. A description of this RF channel arrangement is

given in Annex 6. Administrations currently using channel arrangements based on the 29.65 MHz

raster are encouraged, in the future, to migrate to this more efficient 28 MHz and sub-multiples

channel arrangement in Annex 2.

Annex 1

RF channel arrangements for the transmission of various digital signals

operating in the 7 725-8 275 MHz band, with 300 MHz duplex spacing,

based on multiples of 2.5 MHz bandwidth referred to in recommends1

This Annex describes an RF channel arrangement for low, medium and high capacity point-to-point

FWS using digital modulation and operating in the band 7 725-8 275 MHz. Channel pairs are

provided with a common transmit-receive separation of 300 MHz.

1 The RF channel arrangement is shown in Fig. 1 and is derived as follows:

Let f0 be the frequency at the centre of the band:

f0 = 8000 MHz

fn be the centre frequency of one RF channel in the lower half of the band (MHz);

nf be the centre frequency of one RF channel in the upper half of the band (MHz),

then the centre frequencies of the individual channels are expressed by the following relationships:

1.1 for systems with a 30 MHz channel bandwidth:

lower half of the band: fn = f0 290 + 30 n MHz

upper half of the band: nf = f0 + 10 + 30 n MHz

where:

n = 1, 2, 3, 8;




where:

n = 1, 2, 3, 12;

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where:n = 1, 2, 3, 25.

FIGURE 1

RF channel arrangements for the band 7 725-8 275 MHz

(All frequencies in MHz)

F.0386-01

275 275

f0 = 8 000

1 2 3 4 5 6 7 8 1' 2' 3' 4' 5' 6' 7' 8'

30 90

8020

300

300

60

10

Channel numbers = 1, 2, 3, ...8 and 1 , 2 , 3 , ... 8' ' ' '



1 2 3 4 5 6 7 8 9 10 11 12 1' 2' 3' 4' 5' 6' 7' 8' 9' 10' 11' 12'

1 2 3 4 25 1'2'3'4' 25 '

300

2 Low capacity systems with RF channel bandwidths of 1.25 MHz, 2.5 MHz and 5 MHz may

also be utilized by subdividing the 10 MHz RF bandwidth pattern shown in Fig. 1.

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Annex 2

RF channel arrangements for digital FWS operating in the 7 725-8 275

and 8 275-8 500 MHz bands based on multiples of 3.5 MHz

bandwidth referred to inrecommends

1

1 Channel arrangement in the frequency band 7 725-8 275 MHz

The RF channel arrangement, in a frequency band of 275 MHz across the centre frequency

8 000 MHz for up to nine go and nine return channels, each accommodating high capacity digital

systems operating in the 8 GHz band, is as shown in Fig. 2.

Narrower channels, 18 channels 14 MHz wide and 36 channels 7 MHz wide, can be obtained by

subdivision of the 28 MHz main channels.

Channel pairs are provided with a common transmit-receive separation of 283.5 MHz.

The channels centre frequencies are derived as follows:

Let f0 be the frequency of the centre of the band of frequencies occupied (MHz);

fnbe the centre frequency of one RF channel in the lower half of this band (MHz);

nf be the centre frequency of one RF channel in the upper half of this band (MHz).The centre frequency should be:

f0 = 8 000 MHz

then the frequencies (MHz) of individual channels are expressed by the following relationships:

1.1 28 MHz channel arrangement

The frequencies of the individual channels are expressed by the following relationships:


upper half of the band: nf = f0 + 2.5 + 28 n MHz

where:

n = 1, 2, 3, 4, 5, 6, 7, 8 or 9.

FIGURE 2RF channel arrangements for digital FWS operating in the 7 725-8 275 MHz band


F.0386-02

275

1 3 5 72 4 6 8 1 ' 5 '3' 7'2' 6'4 ' 8 'Channelnumber

283.5

28 59.5

9 9 '

22

275

20.5

V (H)

H (V)

8 0000

=

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where:

n = 1, 2, 17 or 18.



lower half of the band: fn = f0 270.5 + 7 n MHz


where:

n = 1, 2, 35 or 36.

2 Channel arrangement in the frequency band 8 2758 500 MHzThe RF channel arrangements are shown in Fig. 3 (interleaved arrangements) and Fig. 4

(co-channel reusable arrangements) and are derived as follows:



nf be the centre frequency of a RF channel in the upper half of the band (MHz);

The centre frequency should be:

f0 = 8387.5 MHz;

then the frequencies (MHz) of individual channels are expressed by the following relationships:

2.1 Channel arrangements, based on interleaved centre frequencies

In the interleaved channel arrangement shown in Fig. 3, adjacent RF channels on the same route can

be used only on different polarization.

28 MHz interleaved channel arrangement with duplex spacing of 119 MHzThe frequencies of the individual channels are expressed by the following relationships:



where:

n = 1, 2, 3, 4, 5, or 6;

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14 MHz interleaved channel arrangement with duplex spacing of 126 MHz




where:

n = 1, 2, 3, . . . 12.

2.2 Channel arrangements, based on co-channel reusable centre frequency

When a channel arrangement permitting frequency reuse is preferred, the channels should be

derived from the above interleaved arrangement using only odd or even n indexes.

The actual resulting arrangements are shown in Figs 4a) and 4b).

FIGURE 3RF channel arrangements for digital FWS operating in the 8 275-8 500 MHz band

(interleaved pattern)


F.0386-03

49

H(V)

V(H)

V(H)

H(V)

142 4 6 8 10 12 2' 4' 12 '6' 8' 10 '

1

1411

3 5 7 9 11 1 ' 3 ' 5 ' 7' 9' 11'

11

49

4282

31

6

5 1 '

2 ' 4' 6'

3' 5'

182818

f0

112.5 112.5

119

126

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FIGURE 4

RF channel arrangements for digital FWS operating in the 8 275-8 500 MHz band (frequency reuse pattern)


F.0386-04

H(V)

V(H)

V(H)

H(V)

1

1411

3 5 7 9 11 1' 3' 5' 7 ' 9 '

18

63

31 5 1 ' 3 ' 5 '

322818

f0

112.5 112.5

119

126

a) Odd channels arrangements

11'

56

H(V)

V(H)

V(H)H(V)

2

1418

4 6 8 10 12 2 4 6 8 10

11

63

42 6 2' 4' 6 '

182832

f0112.5 112.5

119

126

b) Even channels arrangements

56

12

NOTE 1 When using in the same area channel 1 of the 28 MHz arrangements of the 8 275-8 500 MHz

band and channel 8 of the 29.65 MHz arrangement of the 7 725-8 275 MHz band in Annex 6, care should be

taken to their separation of 26.43 MHz only, therefore, those two channels cannot be used on the same link.

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Annex 3

RF channel arrangements for digital FWS up to 140 Mbit/s or synchronous

digital hierarchy bit rates operating in the 7 900-8 400 MHz band, based on

multiples of 3.5 MHz bandwidth referred to inrecommends

1,with a channel separation of up to 28 MHz

1 This Annex describes a RF channel arrangement suitable for digital FWS up to 140 Mbit/s or

synchronous digital hierarchy bit rates operating in the 7 900-8 400 MHz band with a channel

separation up to 28 MHz, and makes provision for eight 28 MHz channels.

The RF channel arrangement is shown in Fig. 5 and is derived as follows:



nf be the centre frequency of one RF channel in the upper half of the band (MHz);

then the frequencies of individual 28 MHz channels are expressed by the following relationships,



where:

n = 1, 2, 3, . . . 8.

FIGURE 5

RF channel arrangement for digital FWS up to 140 Mbit/s or

synchronous digital hierarchy bit rates operating

in the 7 900-8 400 MHz band


F.0386-05

1 5 73 1 ' 3' 5' 7'

2 84 6 2' 4' 6 ' 8 '

f0

70

500

28

26 12

266

2 The eight channels with a separation of 28 MHz can be split to provide 16 channels with a

separation of 14 MHz or 32 channels with a separation of 7 MHz.

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The frequencies of individual channels are expressed by the following relationships:

2.1 for 14 MHz channels:



where:

n = 1, 2, 3, . . . 16.

2.2 for 7 MHz channels:



where:

n = 1, 2, 3, . . . 32.

3 The centre frequencyf0 is 8157 MHz.

Annex 4

RF channel arrangements for the transmission of various digital signals

operating in the 7 725-8 275 MHz band based on multiples

of 2.5 MHz bandwidth referred to in recommends1

1 This Annex describes an RF channel arrangement suitable for the transmission of various

digital signals operating in the 7725-8275 MHz band with a channel separation of 40, 20, 10 and

5 MHz.




nf

be the centre frequency of one RF channel in the upper half of the band (MHz);a) for systems with a channel separation of 40 MHz:



where:

n = 1, 2, 3, ... 6;

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10 Rec. ITU-R F.386-9

b) for systems with a channel separation of 20 MHz:



where:n = 1, 2, 3, ... 11;

c) for systems with a channel separation of 10 MHz:



where:

n = 1, 2, 3, ... 23;

d) for systems with a channel separation of 5 MHz:



where:

n = 1, 2, 3, ... 47.

The centre frequencyf0 is 8000 MHz.

2 Alternatively, an effective RF channel arrangement with 20 MHz, 10 MHz, and 5 MHz

may also be used by subdividing the 40 MHz RF bandwidth pattern as shown in Fig. 7.

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Rec. ITU-R F.386-9 11

FIGURE 6

RF channel arrangements for transmission of various signals operating

with 40 MHz, 20 MHz, 10 MHz and 5 MHz channel

spacing in 7 725-8 275 band


F.0386-06

275 275

f01 2 3 6 1' 2 ' 3' 6'

110

a) for sys tems with a carrier spacing o f 40 MHz

20 40 40 20

310

275 275

f01 2 3 11 1' 2' 3 ' 11'

90

b) for sys tems w ith a carrier spacing of 20 MHz

20 20 20 20

310

275 275

f01 2 3 23 1 ' 2' 3 ' 23 '

90

c) for sys tems with a carrier spacing o f 10 MHz

10 10 10 10

310

275 275

f01 2 3 47 1 ' 2' 3' 47 '

80

d) for systems wit h a carrier spacing of 5 MHz

5 5 5 5

310

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12 Rec. ITU-R F.386-9

FIGURE 7

Alternative RF channel arrangements for transmission of various digital signals

operating with 40 MHz, 20 MHz, 10 MHz and 5 MHz channel spacing

in the band 7725-8275 MHz

F.0386-07

7.725 GHz

1 2 6 1' 2 ' 6 '

110 MHz

a) for sys tems with a carrier spacing of 40 MHz

40 MHz

310 MHz

8.275 GHz

7.745 7.785 7.795 8.000 8.055 8.095 8.255

1 2 1' 3 ' 11'

90 MHz

b) for sys tems wi th a carrier spacing of 20 MHz

20 MHz

310 MHz

7.735 7.795 7.955 8.000 8.045 8.105 8.265

3 4 11 12 2' 4 ' 12 '

8.2458.0858.0657.9357.7757.755

1 2 1' 3' 18 '

80 MHz

c) for sys tems with a carrier spacing of 10 MHz

10 MHz

310 MHz

7.730 7.790 7.960 8.000 8.040 8.210

3 4 22 24 2 ' 4 '

8.0607.9207.7707.750 8.230 8.250 8.270

5 6 7 8 20' 22 ' 24 '

75 MHz

d) for systems wit h a carrier spacing of 5 MHz

5 MHz

310 MHz

7.9625 8.000 8.0373 8.2725

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Rec. ITU-R F.386-9 13

Annex 5

RF channel arrangements for digital FWS operating in the

8 025 to 8500 MHz band based on multiples of 3.5 MHz

bandwidth referred to inrecommends

1

This Annex describes an RF channel arrangement suitable for digital FWS operating in the

8 025-8 500 MHz band with a channel separation multiple of 3.5 MHz.


Let fn be the centre frequency of one RF channel in the lower half of the band (MHz);

nf be the centre frequency of one RF channel in the upper half of the band (MHz);

f0 be the reference frequency (MHz),

f0

= 8 253 MHz

a) for systems with a channel separation of 28 MHz (32 2 Mbit/s):


upper half of the band: nf = f0 9 + 28 n MHz

where:

n = 2, 3, . . . 7;

b) for systems with a channel separation of 14 MHz (16 2 Mbit/s):


upper half of the band: nf = f0 2 + 14 n MHz

where:

n = 2, 3, . . . 14;

c) for systems with a channel separation of 7 MHz (8 2 Mbit/s):



where:n = 3, 4, . . . 28.

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14 Rec. ITU-R F.386-9

FIGURE 8

RF channel arrangements for transmission of digital FWS

operating with multiples of 3.5 MHz channel spacing

in the band 8 025-8 500 MHz


F.0386-08

175 201

f02 3 4 7 2' 3' 4' 7 '

21

a) for systems with a carrier s pacing of 28 MHz

14 28 28 14

208

189 201

f0

14

b) for systems with a carrier spacing of 14 MHz

7 14 14 7

208

68

40

2 3 4 14 2' 3' 4 ' 14'

189 201

f0

10.5

c) for systems with a carrier spacing of 7 MHz

3.5 7 7 3.5

208

33

3 4 5 28 3' 4' 5 ' 28'

Annex 6

Description of the RF channel arrangement

referred to in recommends5

1 The RF channel arrangement, in a frequency band of 275 MHz across the centre

frequency 8 000 MHz for up to eight go and eight return channels, each accommodating high

capacity digital systems up to 140 Mbit/s or synchronous digital hierarchy bit rates operating in the

8 GHz band, is as shown in Fig. 9 and is derived as follows:

Let f0 be the frequency of the centre of the band of frequencies occupied (MHz);fn be the centre frequency of one RF channel in the lower half of this band (MHz);

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Rec. ITU-R F.386-9 15

nf be the centre frequency of one RF channel in the upper half of this band (MHz);then the frequencies of the individual channels are expressed by the following relationships:

lower half of the band: fn = f0 281.95 + 29.65 n MHz

upper half of the band: nf

= f0 + 29.37 + 29.65 n MHz

where:

n = 1, 2, 3, 4, 5, 6, 7 or 8.

FIGURE 9

RF channel arrangements for digital FWS with capacities

up to 140 Mbit/s or synchronous digital hierarchy bit rates operating



F.0386-09

1 5 73 1' 3 ' 5' 7 '

2 84 6 2' 4 ' 6' 8'

f0

29.65 103.77

311.32

275 275

Channelnumber

2 In a section over which the international interconnection is arranged, all the go channelsshould be in one half of the band, and all the return channels should be in the other half of the band.

3 The go and return channels on a given section should preferably use the polarizations

shown below:

Go Return

H(V) 1 3 5 7 1 3 5 7

V(H) 2 4 6 8 2 4 6 8

4 When additional RF channels, interleaved between those of the main pattern, are required,

the values of the centre frequencies of these RF channels should be 14.825 MHz below those of the

corresponding main channel frequencies.

5 In the case of digital FWS with a co-channel arrangement, the plan as shown in Fig. 10,

should be used.

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16 Rec. ITU-R F.386-9

FIGURE 10

Co-channel arrangement for digital FWS operating



F.0386-10

275 275

1 5 7 1' 3 ' 5' 7 '

2 4 6 2' 4 ' 8'8

f0

Channelnumber

29.65 103.77

311.32

3

6'

6 That, for international connections, the centre frequency should be:

f0 = 8000 MHz

This value corresponds to the band 7725-7975 MHz in the lower half and 8025-8275 MHz in the

upper half.

NOTE 1 The RF channel arrangement shown in Fig. 9 overlaps that mentioned in Recommendation

ITU-R F.385, for a centre frequency of 7 700 MHz, by 125 MHz between 7 725 MHz and 7 850 MHz. All

due precautions to avoid mutual interference must be taken by FWS using these channel arrangements.

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