Trellis coded modulation employing lower dimensionality convolut

Details Trellis coded modulation employing lower dimensionality convolut Trellis coded modulation employing lower dimensionality convolut

1997-03-31

1998-01-06

Tse, Young T.

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

375265, 371 43, H04L 512, H03M 1312

Patent

active

057063125

ABSTRACT:
Coding gain is improved by employing an N-dimensional trellis encoder incorporating an N'-dimensional convolutional encoder where N' is less than N. The additional coding gain is realized as a shaping gain. This unique modulator encodes a digital signal by generating a sequence of N-dimensional symbols as a function of the digital signal using an N'-dimensional convolutional encoder within the trellis encoder more than once (integer N/N' times) during each N-dimensional symbol interval. This allows the trellis encoder to produce an output of higher dimensionality than would normally be expected from the lower dimensionality convolutional encoder. The trellis encoder is applicable to television transmission.

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"Trellis-Coded Modulation with Multidimensional Constellations" IEEE Trans. on Info. Theory, vol. IT-33, No. 4, Jul. 1987, pp.483-501.
"Trellis-Coded Modulation with Redundant Signal Sets Part 1: Introduction, and IEEE Communications, Feb. 1987, vol. 25, No. 2 pp. 5-21 Part II State of the Art".

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