Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2005-06-21
2005-06-21
Bocure, Tesfaldet (Department: 2631)
Pulse or digital communications
Equalizers
Automatic
C375S343000, C375S355000
Reexamination Certificate
active
06909742
ABSTRACT:
Compensating for channel response in communications systems. An equalizing system includes a correlation block to calculate a correlation statistic from a received signal. The correlation statistic is used by a microcontroller to predict a channel response that includes a number of expansion coefficients. A steepest decent procedure is applied to the expansion coefficients. The steepest decent procedure may include, for example, a bias, or zeroing expansion coefficients by trial and error to remove ghost peaks. The steepest decent procedure produces a number of optimized expansion coefficients. The optimized expansion coefficients are used to create a number of filter coefficients. The filter coefficients are applied to an equalizer. The equalizer compensates for effects of the channel response to produce an equalized output signal.
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Simon Haykin,“adaptive filter Theory, foruth edition,” 2002, Prentice Hall, pp203-227.
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Bocure Tesfaldet
Finisar Corporation
Workman Nydegger
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