Safran CORTEX Series - Interface between Trellis Coded Symbols and Bytes; Figure 32: Data Arrangement in TCM 2.5 Bits;Channel_Symbol

HIGH DATA RATE RECEIVER
HDR-4G+ USER’S MANUAL
Ref. DTU 100782
Is.Rev 3.5
Date: June 1, 2021
© Safran Data Systems – IMP000074 e14r1
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
Page 107
Interface between Trellis Coded Symbols and Bytes 3.3.7.3.4
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.
Figure 32: Data Arrangement in TCM 2.5 bits/channel_symbol
w10 w9 w8 w7 w6 w5 w4 w3 w2
w1
A
B
C
D
E
Byte 5
Byte 4
Byte 3
Byte 2
Byte 1
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
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
w10 w9 w8 w7 w6 w5 w4 w3 w2
w1
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.
Decuplet 2 =
MTCM symbol 2
Decuplet 3 =
MTCM symbol 3
Decuplet 4 =
MTCM symbol 4