Trellis coded FM digital communications system and method

Details Trellis coded FM digital communications system and method Trellis coded FM digital communications system and method

1997-03-14

1999-01-19

DeCady, Albert

Excavating

375334, 329300, G06F 1110

Patent

active

058621555

ABSTRACT:
A method and apparatus for encoding and convolutionally decoding a data word of a data word sequence. For a data word having k bits, a 2.sup.k subset of signal points from a square set of M by M signal points having X coordinates and Y coordinates is selected using a trellis encoding algorithm and a previous data word. The square set of M by M signal points includes a constellation of 2.sup.k+1 signal points. A signal point from the selected subset of signal points is selected using the n.sup.th data word. A modulator generates a first FSK signal and a second FSK signal from the selected signal point. A demodulator demodulates the first FSK signal as a received X coordinate and the second FSK signal as a received Y coordinate. A 2.sup.k received subset of signal points is estimated by using the convolutionally decoding algorithm and a previously received data word. An n.sup.th received data word is estimated from the received X coordinate, the received Y coordinate, and the estimated-received subset of signal points.

REFERENCES:
patent: 4581601 (1986-04-01), Calderbank et al.
patent: 4788694 (1988-11-01), Calderbank
patent: 4831635 (1989-05-01), Lee et al.
patent: 4901331 (1990-02-01), Calderbank et al.
patent: 4939555 (1990-07-01), Calderbank et al.
patent: 4945549 (1990-07-01), Simon et al.
patent: 5023889 (1991-06-01), Divsalar et al.
patent: 5103463 (1992-04-01), Schoenenberg
patent: 5321725 (1994-06-01), Paik et al.
patent: 5373532 (1994-12-01), Fujita et al.
patent: 5373533 (1994-12-01), Hayashihara et al.
patent: 5379324 (1995-01-01), Mueller et al.
A. R. Calderbank, "New Trellis Codes Based on Lattices and Cosets" IEEE Transactions on Information Theory, vol. II-33 No. 2, pp. 177-195, Mar. 1987.
Atkin et al., "An Efficient Modulation/Coding Scheme for MFSK Systems on Bandwidth Constrained Channels", pp. 1396-1397, 1399-1401, IEEE.
Schilling et al., "M-ary Trellis Coded FSK for Narrowband Low Error Rate Applications" pp. 558-562.

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