Pulse or digital communications – Repeaters – Testing
Patent
1987-02-20
1988-11-29
Griffin,
Pulse or digital communications
Repeaters
Testing
375 18, H04L 2704
Patent
active
047886943
ABSTRACT:
A succession of (k+n)-bit input words are coded for transmission over a (1 - D) partial response channel by applying n of the bits of each word to a trellis coder which, in turn, selects one of a plurality of 2.sup.m cosets from a predefined lattice, where M>n. A signal point, or "seed," is then selected as a function of both (a) the values of the other k bits and (b) the value, referred to as the "channel state", of the last pulse in the previous signalling interval, in such a way as to ensure that the signal point presented to the receiver is a point in the selected cost. Viterbi decoding on the cosets is then used in the receiver to recover the most likely sequence of transmitted signal points and, in turn, the (k+n)-bit input words.
REFERENCES:
patent: 4489418 (1984-12-01), Mazo
patent: 4581601 (1986-04-01), Calderbank et al.
patent: 4597090 (1986-06-01), Forney, Jr.
patent: 4601044 (1986-07-01), Kromer, III. et al.
patent: 4660214 (1987-04-01), Pahlavan et al.
American Telephone and Telegraph Company AT&T Bell Laboratories
Chin Stephen
Slusky Ronald D.
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