Pulse or digital communications – Equalizers
Reexamination Certificate
2007-06-12
2007-06-12
Kim, Kevin (Department: 2611)
Pulse or digital communications
Equalizers
C375S240150, C375S240020, C708S300000, C708S322000, C708S323000
Reexamination Certificate
active
11344406
ABSTRACT:
This invention describes an apparatus and method to improve the performance of a decision feedback equalizer (DFE) for time-varying multi-path channels. For minimum-phase channels, the equalization is performed in a time-forward manner. For maximum-phase channels, the equalization is performed in a time-reversed manner. More specifically, for maximum-phase channels, the filter coefficients are computed based on the channel estimates reversed in time, and the filtering and equalization operations are performed with the received block of symbols in a time-reversed order. In the context of this invention, the term “minimum-phase channel” implies that the energy of the leading part of the channel profile is greater than the energy of the trailing part. The term “maximum-phase channel” implies that the energy of the leading part of the channel profile is less than the energy of the trailing part.
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Allpress Steve A.
Li Quinn
Kim Kevin
Wong Linda
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