Adaptive equalization employing pattern recognition

Pulse or digital communications – Equalizers – Automatic

Reexamination Certificate

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C375S233000, C375S231000, C375S348000, C375S349000, C370S222000

Reexamination Certificate

active

08045609

ABSTRACT:
In described embodiments, an adaptive equalizer employed by a receiver in a communication channel, such as Fiber Channel, employs pattern recognition. When a repeating pattern, such as an IDLE or ARBFF pattern, is employed by a standard to, for example, maintain a communication link, an equalizer of the receiver might adaptively set its equalizer parameters based on characteristics of the signal energy of the repeating pattern rather than adaptively set its equalizer parameters based on characteristics of the signal energy of generally random user data carried on the link. Pattern recognition by the receiver allows for maintaining adaptive equalizer parameters at settings preferred for data detection of the typical random data, improving data detection performance of the receiver when the channel transitions from a preset or synchronization repeating pattern to a user random data pattern.

REFERENCES:
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patent: 7639737 (2009-12-01), Palmer
patent: 2002/0060820 (2002-05-01), Buchali
patent: 2005/0008070 (2005-01-01), Wang et al.
patent: 2005/0047500 (2005-03-01), Gupta et al.
patent: 2005/0169168 (2005-08-01), Aronson et al.
patent: 2009/0086807 (2009-04-01), Aziz et al.
patent: 2009/0141828 (2009-06-01), Huang et al.
patent: 2010/0329322 (2010-12-01), Mobin et al.

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