Multidimensional trellis-coded communication system

Details Multidimensional trellis-coded communication system Multidimensional trellis-coded communication system

1993-04-19

1995-05-23

Envall, Jr., Roy N.

Excavating

375265, 375244, G06F 1110, H04L 512

Patent

active

054187982

ABSTRACT:
A trellis-coded modulation system is provided in which the output of the trellis encoder is used to select a subset of a multidimensional QAM constellation. The selection process is performed such that a) the minimum square Euclidean distance between valid sequences of successive selected subsets is maximized, b) the resulting code is rotationally invariant, and c) the selected subset corresponding to a transition of the trellis encoder from a present state i to a different next state j is different from the selected subset that corresponds to a transition of the trellis encoder from a present state j to a next state i.

REFERENCES:
patent: 4713817 (1987-12-01), Wei
patent: 4873701 (1989-10-01), Tretter
patent: 5307377 (1994-04-01), Chouly et al.
Wei, "Rotationally Invariant Convolutional Channel Coding with Expanded Signal Space Parts I and II", IEEE vol. SAC-2 No. 5; Sep. 1984, pp. 659-686.
IEEE Trans. on Information Theory vol. IT-33, No. 4, Jul. 1987, Wei, pp. 483-501.

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