Transmission system and modem utilizing coded modulation

Details Transmission system and modem utilizing coded modulation Transmission system and modem utilizing coded modulation

1996-03-12

1997-02-18

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375265, 371 34, H04L 2738

Patent

active

056047720

ABSTRACT:
The transmission system and the modem according to the invention use trellis-coded modulation based on a constellation split up into N sub-sets. For each received symbol in this constellation a decision arrangement makes it possible to determine the combination of the N points closest to the received symbol in each of the N sub-sets. Therefore, the constellation is split up into zones corresponding each to a given combination, and the arrangement comprises a zone searching module (2) in which any received point is situated. This module then controls the reading of a Table (3) which gives a combination of points which combination corresponds to this zone.

REFERENCES:
patent: 4709377 (1987-11-01), Martinez et al.
"The Viterbi Algorithm", by G. David Forney, Jr., Proc. of the IEEE, vol. 61, No. 3, Mar. 1973.

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