Pulse or digital communications – Repeaters – Testing
Patent
1985-07-29
1987-07-07
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 14, H04B 310
Patent
active
046792082
ABSTRACT:
An equalization system wherein a signal received over a line is equalized and the quantity of equalization is compensated based on a difference, or error, between the equalized received signal and a signal which is estimated from the received signal, including a tuning device which compensates the amount of equalization by training, which precedes reception of communication data. A difference or error range which is usable for the compensation of the quantity of equalization is set up during a training sequence. The error range sequentially increases as the training sequence proceeds. Thus, decision feedback updating during the training sequence only occurs so long as the difference between the equalized received signal and a signal which is estimated from the received signal is within the error range, which is sequentially increased during a training sequence. After completion of the training sequence decision feedback updating is always allowed.
REFERENCES:
patent: 4227152 (1980-10-01), Godard et al.
patent: 4253184 (1981-02-01), Gitlin et al.
patent: 4253186 (1981-02-01), Godard
patent: 4388724 (1983-06-01), Gockler
Griffin Robert L.
Huseman M.
Ricoh & Company, Ltd.
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