Non-linear encoder and decoder for information transmission thro

Details Non-linear encoder and decoder for information transmission thro Non-linear encoder and decoder for information transmission thro

1991-09-03

1993-11-23

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 60, 375 94, 371 43, H04L 512

Patent

active

052651274

ABSTRACT:
In order to mitigate against the multiplicative noise effects caused by known non-linearities in a trellis coded data transmission system, a signal constellation is formed by starting with a base constellation whose number of signal points and whose geometry are selected in accordance with conventional criteria and then warping that constellation by adjusting the positions of its signal points in accordance with a warp function which is the inverse of the known component of the non-linear characteristic of the transmission system. Because the constellation warping is deterministic, it is possible for the receiver to "unwarp" the received signal points prior to applying them to the Viterbi decoder.

REFERENCES:
patent: 4660214 (1987-04-01), Pahlavan et al.
patent: 5056117 (1991-10-01), Gitlin et al.
patent: 5105443 (1992-04-01), Betts et al.
patent: 5150381 (1992-09-01), Forney, Jr. et al.

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