Trellis-coded modulation system

Details Trellis-coded modulation system Trellis-coded modulation system

1993-12-14

1996-07-16

Baker, Stephen M.

Excavating

375265, H03M 1312, H04L 100

Patent

active

055374301

ABSTRACT:
A convolutional encoder for a trellis coded modulation (TCM) system includes a first adder first outputting a first output bit by a modulo-two sum of a present input bit and a twice-delayed input bit of an upper stage, a present input bit and a once-delayed input bit of a lower stage, among 3-bit output bits; a second adder for outputting a second output bit by a modulo-two sum of a once-delayed input bit and a twice-delayed input bit of the upper stage and a present input bit of the lower stage; and a third adder for outputting a third output bit by a modulo-two sum of a present input bit of the upper stage and a once-delayed input bit of the lower stage. A trellis-coded modulation system includes a coder for receiving and encoding data; a mapper for inputting the remaining uncoded bit and the bit coded by the coder and converting them into a predetermined bit; a modulator for modulating the bit signal output from the mapper; and a controller for controlling the coder and mapper. Therefore, circuitry is simplified and the integration thereof is easy, while speed is improved.

REFERENCES:
patent: 4520490 (1985-05-01), Wei
patent: 4581601 (1986-04-01), Calderbank et al.
patent: 4601044 (1986-07-01), Kromer, III et al.
patent: 4807230 (1989-02-01), Sriniyasagopalan
patent: 4807253 (1989-02-01), Hagenauer
patent: 4873701 (1989-10-01), Tretter
patent: 4939555 (1990-07-01), Calderbank et al.
patent: 4980897 (1990-12-01), Decker et al.
patent: 5231639 (1993-07-01), Matui
Lin et al., Error Control Coding Fundamentals and Applications, Prentice-Hall, Inc., 1983, pp. 287-314.
Ungerboek, Gottfried, "Trellis-Coded Modulation with Redundant Signal Sets Part 1: Introduction", IEEE Communications Magazine, 25:2, Feb. 1987, pp. 5-21.

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