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transmitted first.
4.4.5.3.3.3.1 At a channel rate of 21.0 kbitsls the fill-in
field shall consist of 84 zeros, each subtield shall contain 12
sub-band data bits and 192 primary bits, and the last 12 bits of
the 25th sub-band data subfield shall be filled with zeras.
4.4.5.3.3.3.2 Recommendation.- At the recommended
channel rate of 6.0 kbits/s the fill-infteld should consist of 40
zeros, each subfield should contain 8 sub-band data bits and
48 primary bits, and the last 8 bits of the 25th sub-band data
subfield should be jilled with zeros.
4.4.5.3.3.3.3 At a channel rate of 8.4 kbitsls the fill-in
field shall consist of a single reference bit with a value set to
1, and each subfield shall contain 12 sub-band data bits and 96
primary bits.
4.4.5.3.3.4 Scrambling. The Standard in 4.4.2.2.5.1 shall
apply-
4.4.5.3.3.5 Fonvard error correction (FEC) coding
4.4.5.3.2 Dummy field. Where the channel rates are 4.4.5.3.3.5.1 8.4 kbits/s C channel. The FEC consists of a
implemented as defined in Table 4-9, and as illustrated in punctured rate 213 convolutional coding of constraint length
Figures 4-9,4-9 his and 4.1 0, the number of bits in the dummy = and a soft decision Vircrbi decoder. The generator
field shall be: polynomials for this code shall be:
- 62 at 10.5 kbitds:
- 44 at 21.0 kbitsls;
- 37 at 5.25 kbitsls;
- 32 at 6.0 kbitsls; and
- 0 at 8.4 kbitsls.
The dummy bits for the 5.25, 6.0, 10.5 and 21.0 kbitsls
channels shall consist of the sequence 0101 1010 001 1 1100
repeated until the required number of hits is obtained. For the
8.4 kbits/s C channel there is a single dummy bit d3 added
after E C encoding. The value of bit d3 is set to 1, as shown
in Figure 4-9 bis.
4.4.5.3.3 INFORMATION FIELD FOR
CODED CHANNELS
4.4.5.3.3.1 At the channel rate of 8.4 kbitsls this field
shall contain 4 096 bits which shall be subdivided into 16
interleaver blocks of 256 bits each. At the channel rate of
21.0 kbitsls this field shall contain 10 368 bits which shall be
subdivided into 27 interleaver blocks of 384 bits each.
4.4.5.3.3.2 Recommendation.- At the recommended
channel rate of 6.0 kbitds this field should contain 2 880 bits
which are subdivided into 15 interleaver blocks of 192 bits
each.
4.4.5.3.3.3 Information field structure including sub-band
data. Prior to scrambling, FEC encoding and interleaving, the
information field shall consist of a fill-in field followed by 25
alternating sub-band data and transparent data (voice) subfields
as shown in Figure 4-9 or 4-9 bis, as appropriate..
The input/output relationship of the encoder is three output
bits for every two input bits; the fourth bit of every four
transmitted bits is dropped. The sequence is:
Input bit 1 2
Output sequence G1 G2 G1
4.4.5.3.3.5.2 Other C channel rates. l%e information field
shall use rate ?h forward error correction coding. The FEC
coding shall be implemented with a constraint length 7 rate '/2
convolutional encoder. The output sequence of the encoded
symbols shall be G1, G2 (as defined in 4.4.5.3.3.5.1 and as
shown in Figure 4-3). The convolutional encoder sllall not be
initialized between frames.
4.4.5.3.3.6 Interleaving
4.4.5.3.3.6.1 The number of rows in the interleaver shall
be 64 transmission bits. At the channel, rate of 8.4 kbitsls
the number of columns shall be 4. At the channel rate of
21.0 kbitsls the number of columns shall be 6.
4.4.5.3.3.6.2 Recommendation.- At the recommended
channel rare of 6.0 kbits/s the number of rows in the
interleaver should be 64 transmission bits and the interleaver
columns should be 3.
4.4.5.3.3.6.3 At the transmitter the output of the
convolutional encoder shall be written into the 64-bit columns,
2/1l/OO
No. 75
Part I Annex 10 - Aeronautical Telecommunications
until the specified number of columns are full. The rows shall
then be permuted using the algorithm described in 4.4.2.2.5.3.
4.4.5.3.4 Information field for uncoded channels. Where
the channel rates are implemented as defined in 4.1, at the
channel rate of 10.5 kbitsls this field shall contain 5 100 bits
and at the recommended channel rate of 5.25 kbits/s this field
shall contain 2 500 bits.
4.4.5.3.4.1 Information field structure including sub-band
data. Pior to scrambling this field shall be divided into 25
alternating sub-band data and primary fields as shown in
Figure 4-10. Where the channel rates are implemented as
defined in 4.1.3, at the channel rate of 10.5 kbitsls each
subfield shall contain 12 sub-band data bits and 192 primary
bits; the last 12 bits of the 25th sub-band data subfield shall be
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