Initialization scheme for a hybrid frequency-time domain...

Details Initialization scheme for a hybrid frequency-time domain... Initialization scheme for a hybrid frequency-time domain...

2005-02-15

2005-02-15

Le, Amanda (Department: 2634)

Pulse or digital communications

Equalizers

Automatic

C375S350000, C708S323000

Reexamination Certificate

active

06856649

ABSTRACT:
This invention provides a method for initializing the filter coefficients of a hybrid frequency-time domain adaptive equalizer device implementing frequency domain (FD) filter equalization in a forward path and a time domain (TD) filter equalization in a feedback path, with each filter unit having a plurality of adaptable filter taps. Preferably, in initializing the equalizer, the relation1+FG=His obeyed “where (G) is the forward FD equalizer taps, (F) is” the Fast Fourier Transform of the feedback TD equalizer taps, and (H) is the estimated (frequency domain) response of the communications channel.

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Proakis, Ph.D., J.G., Digital Communications, Third Edition, Section 11-2 Adaptive Decision-Feedback Equalizer, pp. 649-650 (1995).

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