In-phase and quadrature decision feedback equalizer

Details In-phase and quadrature decision feedback equalizer In-phase and quadrature decision feedback equalizer

2008-03-04

2008-03-04

Ahn, Sam K. (Department: 2611)

Pulse or digital communications

Equalizers

Automatic

Reexamination Certificate

active

07339989

ABSTRACT:
An apparatus and method are provided for equalizing a dispersive channel based on in-phase and quadrature samples corresponding to an input signal. An equalizer according to the present invention uses a novel adaptation algorithm to adjust filtering characteristics based on previous in-phase samples and a current quadrature sample. The adaptation algorithm is configured to update filter coefficients in response to detecting a transition in the in-phase samples. The equalizer provides equalization for quadrature post-cursor intersymbol interference (ISI) components of the input signal. In an embodiment, the equalizer also provides equalization for in-phase post-cursor ISI components, quadrature precursor ISI components, in-phase precursor ISI components, or a combination of the forgoing.

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