Device and method for automatically controlling decision points

Details Device and method for automatically controlling decision points Device and method for automatically controlling decision points

1997-06-19

1999-04-20

Tu, Trinh L.

Excavating

371 54, 375225, G06F 1100

Patent

active

058963928

ABSTRACT:
An automatic decision-point control type decision circuit has a main decision unit, a sub-decision unit, an exclusive-OR circuit, and a controller. The main decision unit receives a data signal and one of two branched signals while the sub-decision unit receives the data signal and the other of the two branched signals. The two branched signals is obtained by branching a clock signal extracted from the data signal. The exclusive-OR circuit detects the difference between the output signal from the main decision unit and the output from the sub-decision unit. The controller calculates a bit error rate. In order to set the initial value of the decision point of the main decision unit, the controller detects a bit error rate by scanning the difference between the decision point of the main decision unit and the decision point of the sub-decision unit only at the beginning of its operation, and calculates an optimum decision point based on the relationship between the decision points and the bit error rate. Next, to control the decision point of the main decision unit, an optimum decision point is controlled based on the relationship between the bit error rate and a bit error rate detected by scanning only the decision point of the decision unit. This control operation is repeated.

REFERENCES:
patent: 5210712 (1993-05-01), Saito
patent: 5319650 (1994-06-01), Mizutani et al.
patent: 5635875 (1997-06-01), Kusakabe
patent: 5703409 (1997-12-01), Fukumitsu
Neal S. Bergano et al, "Margin Measurements in Optical Amplifier Systems", IEEE Photonics Technology Letters, vol. 5, No. 3, Mar. 1993, pp. 304-306.
M. Kawai et al, "Smart Optical Receiver with Automatic Decision Threshold Setting and Retiming Phase Alignment", Journal of Lightwave Technology, vol. 7, No. 11, Nov. 1989, pp. 1634-1640.

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