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of any error pattern with 3 or fewer bit errors and the
detection of any 4-bit error pattern.
1/11/01
No. 76
Annex 10 - Aeronautical Telecomrnc~nications Volume III
6.4.4.1.3 Transmitter ramp-down. The transmitter power
shall be -20 dBc within 2.5 symbol periods of the middle of the
final symbol of the burst. The transmitter power leakiage when
the transmitter is in the "off' state shall be less than -83 dBm.
Note.- Rqfererace KTCNDO-160D section 21, categoq H
for untenrza radiated signals.
6.4.4.2 Managem,emi,t (M) brirst downlink. The M
downlink burst (as contained in the Manual on VDL Mode 3
Technical Specifications) shall consist of rhrce segments, he
training sequence followed by the system dala and the
transmitter ramp down.
6.4.4.2.1 Training sequence. The M downlink bust
training sequence shall consist of two components as follows:
a) transmitter ramp up and power stabilization; and
b) synchronization and ambiguity resolution.
6.4.4.2.1.1 Transmitter ramp-up and power stabilization.
This shall be as defined in Section 6.4.4.1.1.1.
The encoding of the (24, 12) Golay code words should be as
defined in Section 6.4.4.1.2.
6.4.4.2.3 Transmitter ramp-down. This shall be as defined
in Section 6.4.4.1.3.
6.4.4.3 Voice or &fa (V/D) burst. The V/D burst (as
contained in the Manual on VDL Mode 3 Technical
Specifications) shall consisi of four segments: lhc lraining
sequence followed by the header, the user information r;egment
and the transmitter ramp down. The same V/D burst formal
shall be used for both uplink and downlink.
6.4.4.3.1 Training sequence. VID burst training sequence
shall consist of two components as follows:
a) transmitter ramp-up and power stabilization; and
b) synchronization and ambiguity resolution.
6.4.4.3.1.1 Transmitter ramp-up and power stabilization.
This shall be as specified in Section 6.4.4.1.1.1.
6.4.4.3.1.2 Synchmnization and umbigui~re solution. The
6.4.4+2.1,2 Sy)lchronization ambiguiq second component of the training sequence shall of the
Three separate synchronization sequences shall be used for synchronization sequence, known as s,, as follows:
this burst type. The standard sequence, known as S,, shall be
as follows:
000 111 011 010 000 100 001 010 100 101 011 110
010 101 100 101
and shall bc transmitted from left to right.
and shall be transmitted from left to right. The special
sequence used lo identify poll responses shall be as defined in 6.4.4.3.2 Hsuder. The header segment shall consist of 8
Secrion 6.4.4.1.1.2. transmitted symbols. The 24 transrnicred bits shall be encoded
as 12 bits of header information and 12 -p arity bits, generated -
as a single (24, 12) Golay code word. The encoding of the (24,
The sequence to net entry requests ('I") 12) Golay code word be as defined in Section 6-4.4.1.2.
shall use the following sequeuce:
000 001 111 111 100 000 110 101 010 000 101 001
6.4.4.3.3 User information. The user information segment
100 011 010 011
shall consist of 192 3-bit symbols. When transmitting voice,
FEC shall be applied to the analysis output of the vocoder
and shall be transmitted from left to right.
Note.- The sequence SI* is very closely reluted to the
sequence S!. The 15 phase clzamages between the 16 symbols of
S,* are each exactly 1800 out of phase from the 15 phase
changes associated with S, . This relationship can be used to
simplib the process of simultuneously searching jbr both
seque~zces.
6.4.4.2.2 Systenz data. The system data segment shall
consist of 16 transmitted symbols. The 48 transmitted bits
shall be encoded as 24 bits of system data and 24 bits of parity
bits generated as two consecutive (24, 12) Golay code words.
specified in Section 6.8. The vocoder shall provide satisfactory
performance in a BER environment of lom3 (with a design goal
of The overall bit rate of thc vocoder induding FEC is
4 800 bitsls (except when in the truncated mode in which the
bit rate is 4 000 bits/s).
6.4.4.3.3.1 When transmitting user data, the 576 bits shall
be encoded as a single Reed-Solomon (72, 62) 2'-ary code
word. For user data input to the Reed-Solomon encoder of
length less lhan 496 bits, input data shall be padded wilh
zeroes at the cnd lo a full length of 496 bits. The field defining
the primitive polynomial of the code shall be as described in
Section 6.4.3.1.2.1. The generator polynomial shall be as
follows:
Part I Annex 10 - Aeronautical Telecurnmunicatiu~ts
Note.- The worst case T/R switching time for'nn aircraft
radio occurs when it transmits n downlink M channel messuge
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