Pulse or digital communications – Repeaters – Testing
Patent
1992-07-09
1994-08-30
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
341 4, 341 75, H04L 512, H04M 122, H03M 750
Patent
active
053435001
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. In preferred embodiments, the trellis code is of a type in which the dominant error event is a trellis path error.
REFERENCES:
patent: 4631735 (1986-12-01), Qureshi
patent: 4755998 (1988-07-01), Gallager
patent: 4873701 (1989-10-01), Tretter
patent: 5150369 (1992-09-01), Costa et al.
patent: 5257263 (1993-10-01), Bazet et al.
patent: 5265127 (1993-11-01), Betts et al.
Betts William L.
Calderbank Arthur R.
Saltzberg Burton R.
AT&T Bell Laboratories
Chin Stephen
Le Amanda T.
Slusky Ronald D.
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