Adaptive digital filter including low-pass filter

Details Adaptive digital filter including low-pass filter Adaptive digital filter including low-pass filter

1990-09-28

1992-09-08

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

36472411, 36472412, H04B 110

Patent

active

051464705

ABSTRACT:
An adaptive digital filter for estimating a response characteristic of a signal path by monitoring a sampled output signal of the signal path, estimating a predetermined number of filter coefficients which represent the response characteristic of the signal path, and generating an estimated output signal of the signal path using a plurality of successive sampled input signals of the signal path and the estimated filter coefficients, where the estimation is carried out so that a difference between the output signal and the estimated output signal is reduced. Each of the filter coefficients is extracted by a low-pass filter where the low-pass filter coefficient in the low-pass filter can be set to a constant. Normalization can be carried out in either the input side or the output side of the low-pass filter. Otherwise, the low-pass filter coefficient may be set to 1-K.multidot.X.sub.j (m).sup.2 /r, where r is set equal to a norm of the sampled input signals in the beginning, and is then set to an integrated power of the sample input signals.

REFERENCES:
patent: 4535206 (1985-08-01), Falconer
patent: 4897832 (1990-01-01), Suzuki et al.
patent: 4937813 (1990-06-01), Schenk
patent: 4956838 (1990-09-01), Gilloire et al.
patent: 5029167 (1991-07-01), Arnon et al.
patent: 5042026 (1991-08-01), Koike et al.

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