Differential Coder; Figure 19: Structure Of The 4D 8Psk-Tcm Coder/Mapper; Table 10: Bit Mapping For Differential Coder - Safran CORTEX Series User Manual

3.3.7.2.1

Differential Coder

The differential coder depicted in Figure 20 is used to eliminate phase ambiguity on carrier
synchronization for each modulation efficiency. Table 10 gives the bit reference at input and output of
the differential coder in each case.
An example of differential encoder connections is given in Figure 20 for the 2 bits/channel-symbol
case. The structure of the modulo 8 adder is also shown; it is applicable to both the coder mapper and
differential coder.
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HDR-4G+ USER'S MANUAL

Figure 19: Structure of the 4D 8PSK-TCM Coder/Mapper

Table 10: Bit Mapping for Differential Coder

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