Transmission system using block-coded or trellis-coded modulatio

Details Transmission system using block-coded or trellis-coded modulatio Transmission system using block-coded or trellis-coded modulatio

1994-08-01

1997-04-08

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375222, H04L 2706, H03D 100

Patent

active

056195400

ABSTRACT:
A decoder for a series of received digital signal samples which are encoded as points in a 2-dimensional constellation of points corresponding to authorized code values, which constellation is sub-divided into a plurality of subsets. The branch length .mu. between a received point and the closest authorized point in a subset is calculated as a function of the magnitude and sign of the error distance between the received point and the closest authorized point of the constellation, and of the displacement between successive authorized points in the subsets. It is thus possible to determine branch length without calculation of squared values and without employing any approximations.

REFERENCES:
patent: 5384810 (1995-01-01), Amrang
"Modulation Methods for STM-1 With 29.65 MHz Channel Separation", by Roste et al, 3rd ECRR, Paris, Dec. 17-20, 1991, pp. 89-96.

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