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

1991-07-19

1994-09-27

Beausoliel, Jr., Robert W.

Excavating

375 62, 375 81, 375 88, 371 371, G06F 1110

Patent

active

053512499

ABSTRACT:
A method and apparatus for encoding and convolutionally decoding a data word of a data word sequence. Each data word has k bits. An encoder selects, using a trellis encoding algorithm and a previous data word, a 2.sup.k subset of signal points from a square set of M by M signal points having X coordinates and Y coordinates. The square set of M by M signal points includes a constellation of 2.sup.k+l signal points. The encoder selects, using the data word, a signal point from the selected subset of signal points. A modulator generates a first frequency-shift-keying (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 decoder estimates, using a second processor, a 2.sup.k received subset of signal points using the convolutionally decoding algorithm and a previously received data word. The decoder estimates a received data word from the received X coordinate, the received Y coordinate, and the estimated-received subset of signal points.

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Guillermo E. Atkin et al., "An Efficient Modulation/Coding Scheme for MFSK Systems on Bandwidth Constrained Channels" pp. 1396-1401.
Schilling et al., "M-ARY Trellis Coded FSK for Narrowband, Low Rate Applications" pp. 558-562.
"New Trellis Codes Based on Lattices and Cosets," A. R. Calderbank and N. J. A. Sloane, IEEE Transactions on Information Theory, vol. IT-33, No. 2, pp. 177-195, Mar. 1987.

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