Method and apparatus for eye-opening based optimization

Details Method and apparatus for eye-opening based optimization Method and apparatus for eye-opening based optimization

2008-04-30

2009-06-09

Ghayour, Mohammad H (Department: 2611)

Pulse or digital communications

Receivers

C375S350000, C375S349000, C455S501000, C455S063100, C455S570000, C455S296000, C702S017000, C702S069000, C702S191000, C708S300000, C708S322000, C708S323000

Reexamination Certificate

active

07545886

ABSTRACT:
An eye opening measurement technique, that does not interrupt a receiver's normal operation, is used as a metric for optimizing any selected parameters of the receiver's operation. If eye opening size decreases, as a result of a change to a receiver parameter, the polarity for stepwise changes is reversed such that the next change is in the opposite direction. Other types of search procedures can be used. Eye opening size is the difference between the eye's upper and lower edges. Measurement of eye opening size is accomplished using a data and auxiliary slicer that find each “edge” of an eye opening based upon the slicers' level of agreement. Depending upon the level of agreement, and whether symbols of the upper or lower region of the eye are counted, the threshold of the auxiliary slicer can be adjusted in the direction necessary to converge on the eye edge sought.

REFERENCES:
patent: 4507795 (1985-03-01), Wagner
patent: 5023869 (1991-06-01), Grover et al.
patent: 7194155 (2007-03-01), Kahn et al.
patent: 2003/0016605 (2003-01-01), Tateyama et al.
patent: 2003/0081697 (2003-05-01), Little
patent: 2004/0041599 (2004-03-01), Murphy

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