"Decoding of Trellis-Encoded Signals in the Presence of Intersymbol Interference and Noise" Chavillat et al., IEEE 1988, pp. 694-698 and 6690. |
"Trellis-Coded Modulation w/ Multidimensional Constellations" Wei, IEEE 1987, pp. 483-501. |
"Channel Coding with Multilevel/Phase Signals" Gottfried Ungerboeck, IEEE 1981, pp. 55-67. |
IEEE Journal on Selected Areas in Communication, vol. SAC-2, No. 5, Sep. 1984, pp. 632-647; G. Forney et al.: "Efficient Modulation for Band-Limited Channels", p. 637, col. 2, paragraph 3--p. 638, col. 1, paragraph 1; FIG. 15. |