Application toTrellis Coded Modulation

Source: V.32 modem for Motorola DSP, Dion D. Messer

real

imag

Convolutionally code some

bits to choose a sub-constellation,

use the remaining bits to choose

between the points in a sub-constell.

Example:

32-QAM

3 bits used in coder

(8 sub-constellations,

4 bits per sub-constellation)

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