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

1995-10-12

1997-08-26

Beausoliel, Jr., Robert W.

Excavating

371 3701, 375269, 375334, 329300, 332100, 34082558, G06F 1110

Patent

active

056617348

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+1 signal points. The encoder selects, using the n.sup.th data word, a signal point from the selected subset of signal points. A modulator generates a first channel symbol and a second channel symbol from the selected signal point. A demodulator demodulates the first channel symbol as a received X coordinate and the second channel symbol 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, an n.sup.th received data word from the received X coordinate, the received Y coordinate, and the estimated-received subset of signal points.

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