Channel estimation enhanced LMS equalizer

Details Channel estimation enhanced LMS equalizer Channel estimation enhanced LMS equalizer

2008-07-08

2008-07-08

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Equalizers

Automatic

Reexamination Certificate

active

07397849

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.

REFERENCES:
patent: 6608862 (2003-08-01), Zangi et al.
patent: 6618433 (2003-09-01), Yellin
patent: 6937676 (2005-08-01), Takada et al.
patent: 2006/0114974 (2006-06-01), Zeira et al.

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