Adaptive equalizer with a dual-mode active taps mask...

Details Adaptive equalizer with a dual-mode active taps mask... Adaptive equalizer with a dual-mode active taps mask...

2005-11-02

2009-08-04

Payne, David C (Department: 2611)

Pulse or digital communications

Equalizers

C375S232000, C327S311000, C327S552000, C327S553000

Reexamination Certificate

active

07570690

ABSTRACT:
An adaptive equalizer including an equalizer filter and a tap coefficients generator used to process a sample data stream derived from a plurality of received signals is disclosed. The tap coefficients generator includes an equalizer tap update unit, a vector norm square estimator, an active taps mask generator, a switch and a pilot amplitude reference unit used to minimize the dynamic range of the equalizer filter. A dynamic mask vector is used to mask active taps generated by the equalizer tap update unit when an unmasked signal output by the equalizer filter is selected by the switch to generate an error signal fed to the equalizer tap update unit. A fixed mask vector is used to mask active taps generated by the equalizer tap update unit when a masked signal output by the equalizer filter is used to generate the error signal.

REFERENCES:
patent: 4743864 (1988-05-01), Nakagawa et al.
patent: 6275330 (2001-08-01), Izumi
patent: 6400758 (2002-06-01), Goldston et al.
patent: 2002/0114385 (2002-08-01), Gu et al.
patent: 2003/0086366 (2003-05-01), Branlund et al.
patent: 2005/0232347 (2005-10-01), Chang
patent: 2005/0243955 (2005-11-01), Mondragon-Torres et al.

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