Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2008-07-07
2009-12-08
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
Reexamination Certificate
active
07630433
ABSTRACT:
The present invention is related to an enhanced equalizer using channel estimation. A scaled version of a channel estimate is used as an expected average behavior of the product of a transmitted signal and a received signal to implement Griffith algorithm. The present invention also uses advance or prediction of a channel estimate to overcome the lag problem inherent in a least means square (LMS) algorithm in a time varying channel. Therefore, the present invention enables the use of a small step size while attaining the same tracking capability with a large step size. A channel estimate at some time in the future is used for updating equalizer filter tap coefficients. This may be performed with a prediction filter. Alternatively, a delay may be introduced in the input data to the filter tap coefficient generator, which makes a channel estimate look like a prediction to the filter tap coefficient generator.
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Bocure Tesfaldet
InterDigital Technology Corporation
Volpe and Koenig PC
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