Pulse or digital communications – Equalizers – Automatic
Patent
1995-08-31
1997-08-12
Bocure, Tesfaldet
Pulse or digital communications
Equalizers
Automatic
36472419, H03H 730, H03H 740, H03K 5159
Patent
active
056573499
ABSTRACT:
Identifying an unknown system by the use of adaptive filers by supplying the unknown system with an input signal, subjecting the input signal to subband analysis to produce subband signals, and supplying the subband signals to the adaptive filers as input filter signals. An output signal of the unknown system is subjected to subband analysis to produce a predetermined number K of subband reference signals, producing a predetermined number K of subband error signals representative of differences between the subband reference signals and output signals of the adaptive filters. Tap coefficients are renewed in connection with the taps of each of the adaptive filters on the basis of each of the subband error signals. A first circuit varies the number of the taps of each of the adaptive filters in response to a coefficient value signal representative of values of the tap coefficients. A second circuit adaptively controls the number of the taps varied in a single tap-redistribution among subbands.
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Bocure Tesfaldet
NEC Corporation
Webster Bryan
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