Post-distortion filter for reducing sensitivity to receiver...

Details Post-distortion filter for reducing sensitivity to receiver... Post-distortion filter for reducing sensitivity to receiver...

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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Kim, et al.; A Decision-Feedback Equalizer with Pattern-Dependent Feedback for Magnetic Recording Channels; IEEE Transactions on Communications; Jan. 2001; vol. 49, Issue: 1.
Douglas, et al; Adaptive linearization of power amplifiers in digital radio systems; Signal Processing; Bell Systems Technical Journal; Apr. 1983; vol. 62, Issue 4.

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