Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment
Reexamination Certificate
2011-03-22
2011-03-22
Payne, David C (Department: 2611)
Pulse or digital communications
Receivers
Automatic baseline or threshold adjustment
C375S147000
Reexamination Certificate
active
07912151
ABSTRACT:
Methods and apparatus for reducing sensitivity to nonlinearities in the receiver of a digital communications system are disclosed. One aspect can be referred to as a Post-Distortion Decision Feedback Equalizer (PDFE). A gain stage is often implemented as a variable gain amplifier (VGA), and can introduce significant nonlinearities, a problem exacerbated by signals with a large peak-to-average ratio (PAR). One embodiment provides feed forward information from the VGA regarding its status to a DFE, and the DFE adjusts its filtering based on the provided information. The advantages are also applicable to fixed-gain amplifiers and to transversal filters.
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McAdam Matthew W.
Zortea Anthony Eugene
Knobbe Martens Olson & Bear LLP
Payne David C
PMC-Sierra Inc.
Shah Tanmay K
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