Pulse or digital communications – Multilevel
Patent
1994-03-10
1996-09-17
Chin, Stephen
Pulse or digital communications
Multilevel
375264, 375287, 375290, 375345, 341118, 341139, H04L 2534
Patent
active
055576389
ABSTRACT:
In a digital transmission system including a transmitter (2) coupled via a channel (4) to a receiver (6) a detection signal r.sub.k is compared with a number of reference values to determine the destination symbols a.sub.k. Since the size of the received signal r.sub.k is not known in advance, the ratio between the detection signal and the reference values is to be determined by an adapting circuit (16) on the basis of the received signal and the decisions made. The problem may then occur that as a result of an initially erroneous value of the ratio between detection signal and reference values not a correct adaptation is made. By recognizing such a situation because specific values of the symbols a.sub.k are lacking, in such a situation said ratio can be brought to such a value by the correction circuit (18) that all the values of a.sub.k again occur.
REFERENCES:
patent: 4841301 (1989-06-01), Ichihara
patent: 4860010 (1989-08-01), Iwamatsu
Cideciyan et al., "A PRML System for Digital Magnetic Recording", IEEE Journal on Selected Areas in Communications, vol. 10, No. 1, Jan. 1992, pp. 38-56.
Bergmans Johannes W. M.
Fisher Kevin D.
Steenhof Frits A.
Voorman Johannes O.
Wong-Lam Ho W.
Chin Stephen
Goodman Edward W.
Le Amanda T.
U.S. Philips Corporation
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