Adaptive equalization employing pattern recognition

US8045608B2 · kind B2 · utility

Assignee

• Agere Systems Inc. · US

Inventors

• Xingdong Dai · Bethlehem, US
• Geoffrey Zhang · Allentown, US
• Max J. Olsen · Huntingdon, US
• Dwight Daugherty · Ephrata, US
• Gary E. Schiessler · Allentown, US
• Mohammad S. Mobin · Sachse, US
• Lane A. Smith · Easton, US
• Dennis Farley · Coopersburg, US

Key dates

• Filing date: Jul 30, 2008
• Grant date: Oct 25, 2011
• Expiry date: Apr 18, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L2025/03592
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

In described embodiments, an adaptive equalizer employed by a receiver in a communication channel, such as Fibre 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.