Coded modulation with shaping gain and tomlinson precoding

Details Coded modulation with shaping gain and tomlinson precoding Coded modulation with shaping gain and tomlinson precoding

1994-07-15

1996-09-24

Kostak, Victor R.

Television

Format

Adapted to reduce noise or for frequency modulation

375265, 375296, 348 21, H04N 704

Patent

active

055595618

ABSTRACT:
An HDTV transmission system includes a Tomlinson precoder in the transmitter in order to compensate for forced intersymbol interference introduced by an NTSC rejection filter used in the receiver. The system employs one of a family of four-dimensional coded modulation schemes based on a six-signal-point, one-dimensional base constellation. The various schemes exhibit different amounts of so-called shaping gain and support respective different payload data rates. The characteristics of the Tomlinson precoder are such as to preserve the substantial portion of the shaping gain. The system may switch its operation among the various coded modulation schemes to account for changes in channel conditions and/or to accommodate different source signal bit rates.

REFERENCES:
patent: 5115453 (1992-05-01), Calderbank et al.
patent: 5214672 (1993-05-01), Eyuboglu
patent: 5249200 (1993-09-01), Chen et al.
patent: 5263051 (1993-11-01), Eyuboglu
patent: 5311547 (1994-05-01), Wei
patent: 5388124 (1995-02-01), Lavoia et al.
patent: 5394440 (1995-02-01), Goldstein

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