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Definition of "trellis code" |
a (channel) coding scheme in which the relation between information symbols and coded symbols is determined by a finite-state machine. The current block of information symbols and the state (in the finite-state machine) uniquely determine the block of coded output symbols as well as the next state. Thus, trellis coding can be viewed as generalized block coding for which the encoder function depends on the current as well as previous blocks of non-overlapping information symbols. In the class of trellis codes we, for example, find convolutional codes, trellis-coded modulation and continuous-phase modulation. |
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