Interface Between Trellis Coded Symbols And Bytes; Figure 32: Data Arrangement In Tcm 2.5 Bits/Channel_Symbol - Safran CORTEX Series User Manual

3.3.7.3.4

Interface between Trellis Coded Symbols and Bytes

As the size of trellis coded symbol can vary from 8 to 11 bits, there must be a definition of the
arrangement that gives the bytes (8 bits fixed) for the R-S concatenated part.
The convention is the following, depicted for 4D-8PSK-TCM 2.5 with the arrangement of the 10 bits
with regard to the 8 input bits is described on next figure.
A
Byte 1
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
w10 w9 w8 w7 w6 w5 w4 w3 w2 w1
Decuplet 1 =
MTCM symbol 1
Notes: * Byte 1 is the first byte transmitted on the Air interface,
* The UW will be every time positioned on the byte 1.
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B
Byte 2
D7 D6 D5 D4 D3 D2 D1 D0
w10 w9 w8 w7 w6 w5 w4 w3 w2
w1
Decuplet 2 =
MTCM symbol 2

Figure 32: Data Arrangement in TCM 2.5 bits/channel_symbol

Ref.
Is.Rev
Date:
C
Byte 3
Byte 4
D7 D6 D5 D4 D3 D2 D1 D0
w10 w9 w8 w7 w6 w5 w4 w3 w2
w1
Decuplet 3 =
MTCM symbol 3
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3.5
June 1, 2021
D
E
Byte 5
D7 D6 D5 D4 D3 D2 D1 D0
w10 w9 w8 w7 w6 w5 w4 w3 w2
w1
Decuplet 4 =
MTCM symbol 4
.
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