1、 Rep. ITU-R F.2108 1 REPORT ITU-R F.2108 Fixed service system parameters for different frequency bands (2007) 1 Introduction There is a large variety of fixed-wireless systems in operation or being developed to meet future requirements. This Report provides details of the key radio system characteri
2、stics and parameters for systems in the fixed service (FS). 2 Transmitter characterization The basic transmitter parameters are: carrier frequency; spectral characteristics; equivalent isotropically radiated power (e.i.r.p.); antenna radiation pattern. Operating frequencies normally correspond to ra
3、dio-frequency channel arrangements specified in ITU-R Recommendations. The modulation type and system capacity will give a guide to the spectral characteristics of the emissions. The e.i.r.p. of the transmitter is calculated from the transmitter power, feeder/multiplexer losses and antenna gain. A m
4、aximum e.i.r.p. value would correspond to maximum antenna gain, minimum feeder/multiplexer losses and maximum transmitter output power. In cases where measured patterns are not available, the reference radiation patterns addressed in the following Recommendations should be used: Recommendations ITU-
5、R F.699 Reference radiation patterns for fixed wireless system antennas for use in coordination studies and interference assessment in the frequency range from 100 MHz to about 70 GHz. Recommendation ITU-R F.1245 Mathematical model of average radiation patterns for line-of-sight point-to-point radio
6、-relay system antennas for use in certain coordination studies and interference assessment in the frequency range from 1 GHz to about 70 GHz. Recommendation ITU-R F.1336 Reference radiation patterns of omnidirectional, sectoral and other antennas in point-to-multipoint systems for use in sharing stu
7、dies in the frequency range from 1 GHz to about 70 GHz. 3 Receiver characterization Assessment of the effects of interference into the FS from other services requires knowledge of the performance characteristics of the radio receiver. The following receiver parameters are important for frequency sha
8、ring studies: noise figure; IF bandwidth; receiver thermal noise; 2 Rep. ITU-R F.2108 received signal power for 1 103, 1 106, 1 1010BER (post-error-correction for digital systems); nominal receiver input level. The received signal levels and interference levels could be referenced to the low noise a
9、mplifier (LNA)/mixer input of the receiver, so that they would be independent of receive antenna gain and feeder/multiplexer losses (assuming this to be the same for both transmitter/receiver). The required signal levels for given BERs could be combined with the calculated receiver thermal noise lev
10、el to obtain the required carrier-to-thermal noise ratio, C/N, for a given BER. 4 Tables of system parameters Tables 1 to 38 show selected examples of digital FS systems parameters that are in use in some of the bands in which the FS systems are operating. Similar information on analogue systems can
11、 be found in Tables 39 to 46. The various radio system types are identified in the Tables by modulation type and system capacity. The nominal long-term interference criteria specified in the Tables provide some guidance to the results that would be obtained from detailed calculations and can be used
12、 for information for the time being. For detailed sharing studies accurate criteria must be derived in accordance with the principles in Recommendation ITU-R F.758, and these may differ slightly, in some cases, from those in the Table. It is most important that the following Notes be taken into acco
13、unt when considering the example Tables. NOTE 1 Typically, the carrier level corresponding to 1 106BER is around 4 dB higher than that for 1 103BER; the carrier level difference between the 1 106and 1 1010BER points is also about 4 dB. For radio equipment using forward error correction (FEC), the ca
14、rrier level corresponding to 1 106BER is 1 to 2 dB higher than that for 1 103BER; the carrier difference between 1 106and 1 1010is also 1 to 2 dB. NOTE 2 In the example Tables a straightforward, but conservative, approach to specifying maximum permitted long-term external interference is used. This
15、was done because the characteristics and spatial distribution of the interference sources are undefined, and it is also impractical to attempt detailed performance and availability predictions for such a large number of systems. By referencing interference to the receiver thermal noise level the pro
16、blem is greatly simplified, since the permitted interference PSD so derived will be dependent solely on receiver noise figure and independent of the modulation scheme of the victim system. It may be shown that, independent of the normal received carrier level, the degradation in fade margin with int
17、erference set to a given level relative to receiver thermal noise level is as follows: Interference level relative to receiver thermal noise (dB) Resultant degradation in fade margin (dB) 6 1 10 0.5 Within the Tables, the choice of an interference to thermal noise I/N value of 6 dB or 10 dB is selec
18、ted to match the typical requirements of individual systems. For detailed sharing analyses, the interference criteria must be derived in accordance with the principles in Recommendation ITU-R F.758, to match the individual, specific, sharing scenario under consideration, and will need to be agreed b
19、etween the parties concerned. Another approach stated in Note(3)in some of the later Tables can be applied, conforming to the method given in Recommendation ITU-R F.1565 Performance degradation due to interference from other services Rep. ITU-R F.2108 3 sharing the same frequency bands on a co-prima
20、ry basis with real digital fixed wireless systems used in the international and national portions of a 27 500 km hypothetical reference path at or above the primary rate. NOTE 3 Short-term interference criteria have not been included in the example Tables. This information must be derived in accorda
21、nce with the principles derived in Annex 1 to Recommendation ITU-R F.758. The Tables may be updated when this information becomes available, as a result of future detailed studies of sharing with specific services. NOTE 4 In Tables 1 to 46, the antenna gain is expressed only in terms of maximum gain
22、. However, in certain frequency sharing scenarios, the minimum gain or other parameters (such as side-lobe and back-lobe gain) of the antenna may be more relevant. Annex 2 to this Report gives information about typical minimum antenna gains. 4 Rep. ITU-R F.2108 TABLE 1 Digital P-P FS system paramete
23、rs in the frequency bands below 1 GHz Frequency band (MHz) 340-470 406.1-450 610-960 Modulation GMSK GMSK GMSK DQPSK DQPSK 16-QAM 16-QAM 32-QAM 32-QAM 2-FSK and others Capacity (Mbit/s) 5 32 kbit/s 5 32 kbit/s 5 32 kbit/s 0.32 4 2 8 0.768 8 1.024; 30 channels (it can use lower data rates). Channel s
24、pacing (MHz) 0.6 0.6 0.6 0.25 3.5 1.75 3.5 0.20 1.75 0.75 Base station Base station Out station Antenna gain (maximum) (dBi) 7 12 6 25 25 25 25 25 25 16 Feeder/multiplexer loss (minimum) (dB) 4.4 4.4 2.2 2 2 2 2 2 2 1 Antenna type Omni Sectoral Panel Yagi Yagi Yagi Yagi Yagi Yagi Square reflector Ma
25、ximum Tx output power (dBW) 6 6 6 7 7 10 10 0 0 7 dBW (typical: 0 dBW) e.i.r.p. (maximum) (dBW) 8.6 13.6 9.8 30 30 33 33 23 23 22 dBW (typical: 15 dBW) Receiver IF bandwidth (MHz) 0.6 0.6 0.6 0.3 3.14 3.5 3.5 0.15 1.67 0.75 Receiver noise figure (dB) 4 4 4 5 5 3 3 3.5 3.5 7 Receiver thermal noise (d
26、BW) 146.5 146.5 146.5 144 134 143 137 148.7 138.3 138 Nominal Rx input level (dBW) 100 100 100 100 Rx input level for 1 103BER (dBW) 117 117 117 131 121 122 116 127 117 124 Nominal long-term interference (dBW) 152.5 152.5 152.5 154 144 153 147 157 147 Equivalent power (dB(W/4 kHz) 174.3 174.3 174.3
27、173 173 175 175 173 173 Spectral density (dB(W/MHz) 150.3 150.3 150.3 149 149 151 151 149 149 Refer to Notes DQPSK: Differentially coherent quaternary phase shift keying GMSK: Gaussian minimum shift keying Rep. ITU-R F.2108 5 TABLE 2 Digital P-P FS system parameters in the FS frequency bands below 1
28、 GHz Frequency band (GHz) 0.81-0.96 Modulation 7-FSK 4-QAM 16-QAM 7-FSK 4-QAM 16-QAM Capacity (Mbit/s) 64 kbit/s 64 kbit/s 128 kbit/s 256 kbit/s 256 kbit/s 512 kbit/s Channel spacing (kHz) 50 50 50 200 200 200 Antenna gain (maximum) (dBi) 24 24 24 24 24 24 Feeder/multiplexer loss (minimum) (dB) 3 3
29、3 3 3 3 Antenna type Grid Grid Grid Grid Grid Grid Maximum Tx output power (dBW) 7 7 7 7 7 7 e.i.r.p. (maximum) (dBW) 31 31 31 31 31 31 Receiver IF bandwidth (kHz) 50 50 50 200 200 200 Receiver noise figure (dB) 5 5 5 5 5 5 Receiver thermal noise (dBW) 152 152 152 146 146 146 Nominal Rx input level
30、(dBW) 90 90 90 90 90 90 Rx input level for 1 103BER (dBW) 123 135 130 117 129 124 Nominal long-term interference (dBW) 153 165 160 147 159 154 Equivalent power (dB(W/4 kHz) 164 176 171 164 176 171 Spectral density (dB(W/MHz) 140 152 147 140 152 147 Refer to Notes 6 Rep. ITU-R F.2108 TABLE 3 Digital
31、P-P FS system parameters in the FS frequency bands below 1 GHz Frequency band (GHz) 0.81-0.96 Modulation PSK 4 PSK FSK Capacity 1 channel 2 Data Channel spacing 25 kHz 2 12.5 kHz Antenna gain (maximum) (dBi) 10 8-26 10 Feeder/multiplexer loss (minimum) (dB) 0 5 0 Antenna type Yagi Yagi/ Dish Yagi Ma
32、ximum Tx output power (dBW) 7 0 7 e.i.r.p. (maximum) (dBW) 17 21 17 Receiver IF bandwidth (kHz) 25 1.5 12.5 Receiver noise figure (dB) 5 7 5 Receiver thermal noise (dBW) 155 135 158 Nominal Rx input level (dBW) 79 Rx input level for 1 103 BER (dBW) 119 Nominal long-term interference (dBW) Equivalent
33、 power (dB(W/4 kHz) Spectral density (dB(W/MHz) Refer to Notes Rep. ITU-R F.2108 7 TABLE 4 Digital P-P FS system parameters in the FS frequency bands between 1 and 3 GHz Frequency band (GHz) 1.4 1.45-1.53 Modulation 4 PSK PSK 4-PSK 4-PSK 4-PSK 16-QAM 4-PSK PCM MSK 4-PSK 4-PSK 4-PSK 4-PSK Capacity 2
34、704 kbit/s2 Mbit/s 9.6 kbit/s 64 kbit/s 64 kbit/s 144 kbit/s 2 Mbit/s 2 2 Mbit/s 2 2 Mbit/s 4 2 Mbit/s 2 2 Mbit/s Channel spacing (MHz) 2 1 0.025 0.075 0.0375 0.225 0.5 2 2 3.5 7 4 Antenna gain (maximum) (dBi) 8-26 33 33 33 33 33 33 16 16 28 28 16 Feeder/multiplexer loss (minimum) (dB) 5 1 1 1 1 1 1
35、 5 3 T:3/R:6 T:3/R:6 5 Antenna type Yagi/ Dish Dish Yagi/ dish Yagi/ dish Yagi/ dish Yagi/ dish Yagi/ dish Yagi Dish Dish Yagi Maximum Tx output power (dBW) 0 7 7 7 7 7 10 7 7 6 6 7 e.i.r.p. (maximum) (dBW) 21 39 39 39 39 39 42 20 20 31 31 20 Receiver IF bandwidth (MHz) 1.5 0.7 0.005 0.032 0.016 0.0
36、72 0.35 1.2 1.2 3.5 7 3 Receiver noise figure (dB) 7 4.5 4 4 4 4 8 4 4 4 4 4 Receiver thermal noise (dBW) 135 141 163 155 158 151 141 139 139 135 132 135 Nominal Rx input level (dBW) 79 90 118 112 103.5 106 90 86 84 136 133 83 Rx input level for 1 103 BER (dBW) 119 120 143 137 128.5 131 126 124 124.
37、3 121.3 123 Nominal long-term interference (dBW) 151 173 167 168 161 151 145 145 146 143 141 Equivalent power (dB(W/4 kHz) 173.6 179.4 Spectral density (dB(W/MHz) 149 150 152 150 150 146 146 146 149.7 155.4 146 Refer to Notes (2), (4) (2), (4) (2), (4) (2), (4) (2), (4) (2), (4) (1), (4) (1), (4) (1
38、)Specified interference will reduce system C/N by 1 dB (interference 6 dB below receiver thermal noise floor). (2)Specified interference will reduce system C/N by 0.5 dB (interference 10 dB below receiver thermal noise floor). (3)Specified interference will have a relative contribution of no more th
39、an 10% of total noise (Recommendation ITU-R F.1094). (4)The specified interference level is total power within the receiver bandwidth. 8 Rep. ITU-R F.2108 TABLE 5 Digital P-P FS system parameters in the FS frequency bands between 1 and 3 GHz Frequency band (GHz) 1.7-1.9 1.7-2.45 (refer also to Table
40、 6) Modulation 4-PSK 4-PSK 4-PSK tropos. 4-PSK 4-PSK 4-PSK 4-PSK 4-PSK 9-QPR O-QPSK 4-PSK 4-PSK Capacity 2 2 Mbit/s 4 2 Mbit/s 2 Mbit/s 34 Mbit/s 8 Mbit/s 48 channels 12.6 Mbit/s 2 8 Mbit/s 4 1.54 Mbit/s 45 Mbit/s 8 Mbit/s 2 8 Mbit/s Channel spacing (MHz) 14 14 Special 29 14 2.5 28 14 3.5 29 7 14 An
41、tenna gain (maximum) (dBi) 28 28 45 31 30 29 30 28 32 33 28 28 Feeder/multiplexer loss (minimum) (dB) T:3/R:6 T:3/R:6 2 1 3 6 3.5 4 3 3 5 5 Antenna type 2.4 m dish 2.4 m dish 9 m dish 1.8 m dish 1.2 m dish Dish Dish 2.4 m dish 3 m dish 3 m dish 1.8 m dish 1.8 m dish Maximum Tx output power (dBW) 0 0
42、 30 3 0 9 10 3 6 7 7 3 e.i.r.p. (maximum) (dBW) 25 25 73 34 30 14 16.5 29 38 40 20 23 Receiver IF bandwidth (MHz) 3.5 7 1 20 4 1.5 6.5 8 3.5 29 3 4.6 Receiver noise figure (dB) 4 4 4 4 5 6 9 4 5 4 4 4 Receiver thermal noise (dBW) 136 133 140 127 133 131 133 125 135 133 Nominal Rx input level (dBW) 7
43、3 78 78 88.3 70 75 83 83 Rx input level for 1 103 BER (dBW) 124.3 121.3 131 113 118 117 112 123 123 Nominal long-term interference (dBW) 146 143 146 137 143 137 139 135 141 139 Equivalent power (dB(W/4 kHz) 173.6 179.4 170 168 174 Spectral density (dB(W/MHz) 149.7 155.4 146 150 149 146 146 146 Refer
44、 to Notes(1), (4) (2), (4) (2), (4) (3), (4) (3), (4) (1), (4) (1) (1) (1) (1) (1)Specified interference will reduce system C/N by 1 dB (interference 6 dB below receiver thermal noise floor). (2)Specified interference will reduce system C/N by 0.5 dB (interference 10 dB below receiver thermal noise
45、floor). (3)Specified interference will have a relative contribution of no more than 10% of total noise. (4)The specified interference level is total power within the receiver bandwidth. Rep. ITU-R F.2108 9 TABLE 6 Digital P-P FS system parameters in the FS frequency bands between 1 and 3 GHz Frequen
46、cy band (GHz) 1.7-2.45 2.1-2.2 2.45-2.69 Modulation 64-QAM 256-QAM 32 TCM 64-QAM 256-QAM MSK 4-PSK 4-PSK Capacity 45 Mbit/s 18.5 Mbit/s 3.1 Mbit/s 6.2 Mbit/s 18.5 Mbit/s 2 2 Mbit/s 34 Mbit/s 2.3 Mbit/s Channel spacing (MHz) 10 3.5 0.8 1.6 3.5 14 Antenna gain (maximum) (dBi) 33 33 38 38 38 25 35.4 Fe
47、eder/multiplexer loss (minimum) (dB) 2 2 0 0 0 4 Antenna type Dish Dish Dish Dish Dish 1.2 m dish 3 m dish Yagi Maximum Tx output power (dBW) 1 1 +2 +5 +2 5 2 e.i.r.p. (maximum) (dBW) 34 32 40 43 40 26 33 Receiver IF bandwidth (MHz) 10 3.5 0.8 1.6 3.5 3 Receiver noise figure (dB) 4 4 3 3 3 4 Receive
48、r thermal noise (dBW) 130 134.5 142 139 136 135 Nominal Rx input level (dBW) 65 65 60 60 60 Rx input level for 1 103 BER (dBW) 106 104.5 117 115 105 Nominal long-term interference (dBW) 136 140.5 152 149 146 141 111.5 Equivalent power (dB(W/4 kHz) 170 170 170 Spectral density (dB(W/MHz) 146 146 151 151 151 162 Refer to Notes (2), (4) (2), (4) (2), (4) (2)Specified interference will reduce system C/N by 0.5 dB (interference 1
