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AWhment A to Part I Annex 10 - AeronaUanauaTceaklc ommlmicalions
Table A-8. Typical IUT channel carrier to noise densities required
From-aircraft link R/T channels I From-aircraft link RII channel
(low rate data) (high rate data)
Elevation angle to the satellite (degrees) 5 20 5 20
Objective FEC decoder output BER 10" 1 oJ 1Cr5 10"
AES minimum antenna gain (dB) 0 0 12 12
Carrier/multipath ratio (dB) 7 12 10 12
Multipath fading bandwidth (Hz) 20 to 100 20 to 100 20 to 100 20to 100
FEC coding rate
Modulation method
Theoretical require. Efl, (dB)
!4 % 44 !4
A-BPSK A-BPSK A-QPSK A-QPSK
5.0 3.5 2.8 2.4
Modem implementation loss (dB) 1.2 1.1 1.5 1.1
Imperfect interleaving loss (dB)' 1.2 0.6 1 .O 0.5
Adjacent channel interference loss (dB)' 0.1 0.1 0.4 0.4
Modem EJN, (dB) required 7.5 5.3 5.7 4.4
REQUIRED Chi, (dBHz)
0.6 kbitsls
1.2 kbitds
1 0.5 kbitsls 45.9 44.6
NOTES:
1. The interleaver loss is a function of channel rate, the example losses correspond to channel raies of 2.4 and 10.5 kbitds for
A-BPSK and A-QPSK. respectively.
2. The adjacent channel interference loss is a function of channel spacing, the example losses correspond to channel rates of 2.4
and 10.5 kbitds for A-BPSK and A-QPSK, respectively. The losses should be no greater for the other channel rates because the
channel spacing, relative to the channel rate, will be larger.
3. The low data rates (A-BPSK) can also be used with high gain antennas with potentially less CM, required.
Annex 10 - Aeronautical Telecommunications Volume III
Table A-9. Channel spacings
Channel rate (khits/s) Channel spacing (kHz) Modulation
21.0 17.5 A-QPSK
6.0 5.0 A-QPSK
5.25 5.0 A-QPSK
A-QPSK
A-BPSK
1.2 5.w.5' A-BPSK
0.6 5.W2.5' A-BPSK ,
I. Channel spacing for 10.5 kbit~/sc hannels may be 10.0 or 7.5 kHz, according to the
relative availability of power and bandwidth in the operating satellite.
2. Channel spacing of 5.0 kHz applies to the P channel and 25 kHz applies to the R and
T channel.
Table A-10. vpical values for computing earliest starting time
P Channel bit rate P-Channel unit Queuing AES processing
bits/$ delay(s) delay($) delay(s)
Table A-11. Minimum throughput values
(minimum achievable throughput on a subnetwork connection, bitsts, with 128-octec packets)
To-aircraft I From-aircraft
Minimum channel
rate in use Highest priority Lowest priority Highest priority Lowest priority
service service service service
Table A-12. Probability of delivering at least one
abbreviated access request SU (per cent)
Conflicting traffic Conflicting traffic
Call priority (series length) comprising I -SU bursts comprising 3.SU bursts
Distresdurgency (4) 99.99
Flight safety (3) 99.7
Regularity/metwrological (2) 97.5
%Me A-13. Projected AMS(R)S subnetwork call set-up delay performance, (seconl)
(R and P channels operating at 600 and 10 500 bitsls)
AIRORIGINATIONS
GROUNDORIGINATlONS
AMS(R)S subnetwork signalling transkt delay
(Difference between the time at which an
air-originated call request (incoming FITE 18) is
received at the AES interworking interface and
the time at which the GES forwards the resultant
call indication (outgoing FITE 18) to the
terrestrial network.)
Call set-up delay
(Difference between the time at which an
air-originated call request (incoming FITE 18) is
received at the AES interworking interface and
the time at which the C channel is ready for
speech).
Call set-up delay
(Difference between the time at which a
ground-originated call request (incoming FIE
18) is received at the GES interworking interface
and the time at which the C channel is ready for
speech and the AES forwards the resultant call
indication (outgoing FITE 18) to the AES
interworking interface.)
Average
4
[@ 600
3
[@ 10 500 bitsls]
12 to 14
[@ 600 bitds]
loto 11
[@ 10 500 bitsls]
9to 11
[@ 600 bitsls]
9
[Q 10 500 bitsls]
95 percentile
6to 11
[@ 600 bitds]
3 to 7
[@ 10 500 bitsls]
14to 23 [@
600 bitsls]
11 to 14 [@ 10
500 titds]
10 to 17 [Q 600
bitds]
10
[@ 10 500 bitsls]
Annex 10 - Aeronautical Telecommunications
FIGURES FOR ATTACHMENT A
Volume ZZZ
10 100
Frequency offset from Cenler (Hz)
Figure A-1. Phase noise of L-band signals received by AES
Frequency offset from Carrier (Hz)
jwnere X IS 35 kHz or four times the symbol rate, whichever is less)
Figure A-2. AES transmit phase noise mask
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