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- W1897394586 abstract "In this chapter we introduce codes designed on a periodic trellis, and whose coded symbols are not restricted to the binary set {0, 1} but rather chosen from a general elementary constellation X. The basic idea underlying Trellis-Coded Modulation (TCM) is to use a convolutional code to generate the redundancy necessary to achieve a coding gain, while preventing bandwidth expansion by increasing the size of the constellation rather than the number of transmitted symbols. Specifically, a rate-k0/n0 convolutional code transforms a binary k0-tuple into a binary n0-tuple. The latter is used as the binary label of a constellation X with |X| = 2 n0 signals. Without coding, the constellation needed would be X′, with |X′| = 2 k0 signals. Thus, coding does not entail any bandwidth expansion if X, X′ have the same dimensionality, while the convolutional code provides a coding gain. In practice. TCM uses n0 = k0 + 1, so |X| = 2|X′| and data are transmitted at a rate of log |X| − 1 bits per signal." @default.
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- W1897394586 date "2006-07-05" @default.
- W1897394586 modified "2023-09-27" @default.
- W1897394586 title "Trellis-coded modulation" @default.
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- W1897394586 doi "https://doi.org/10.1007/1-4020-8084-0_7" @default.
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