Block coding scheme for fractional-bit transmission

Details Block coding scheme for fractional-bit transmission Block coding scheme for fractional-bit transmission

1989-08-30

1992-05-12

Smith, Jerry

Excavating

G06F 1110, H03M 1312

Patent

active

051134012

ABSTRACT:
In a trellis-coded modulation (TCM) transmission system, data bits are grouped into bit blocks (13), and each such bit block is encoded to select a fixed number w of symbols from a given symbol set (14). The symbols are subdivided into subsets, and each subset includes a few outer symbols and a greater number of inner symbols. Each symbol represents one particular transmission signal value. A first portion (17) of each bit block is separated into w bit subgroups, each of which is separately expanded by a convolutional encoder (20) to obtain a bit combination (19, 15) for specifying one of the symbol subsets. The remaining portion (21) of each bit block is expanded by a block coder (22) to obtain w bit subgroups (23), each being a bit combination (25, 16) for selecting one particular symbol out of a specified subset; outer symbols are selected less frequently than inner symbols. The arrangement allows to transmit a non-integer number of data bits per symbol, and further allows to operate with single-symbol TCM.

REFERENCES:
patent: 4077021 (1978-02-01), Csajka et al.
patent: 4747104 (1988-05-01), Piret
patent: 4755998 (1988-07-01), Gallager
patent: 4757506 (1988-07-01), Heichler
patent: 4761784 (1988-08-01), Srinivasagopalan et al.
patent: 4797887 (1989-01-01), Yamasaki et al.
patent: 4829237 (1989-05-01), Segawa et al.
patent: 4897838 (1990-01-01), Tateishi
patent: 4912395 (1990-03-01), Sato et al.
"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.

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