Non linear adaptive filters

Details Non linear adaptive filters Non linear adaptive filters

1986-05-09

1988-12-20

Malzahn, David H.

Boots, shoes, and leggings

G06F 1531

Patent

active

047929154

ABSTRACT:
A non-linear adaptive filter is described having a linear filter connected in parallel with a non-linear filter. The linear filter provides fast adaption until it has modelled the linear contribution of each coefficient. Thereafter the non-linear filter continues to adapt until the error signal has been reduced to an acceptable level.
In a preferred embodiment a plurality of unit delay devices provide taps to sub-processing units each of which is arranged to be adapted according to a linear algorithm during an initial part of a training period, and to a non-linear algorithm after said initial part.
The filter has particular use in echo cancellers for data modems.

REFERENCES:
patent: 4006352 (1977-02-01), Sato
patent: 4435823 (1984-03-01), Davis et al.
patent: 4507747 (1985-03-01), Houdard et al.
patent: 4615038 (1986-09-01), Lim et al.
Chang et al., "A Noniterative Method for Identification Using Hammerstein Model", IEEE Trans. on Automatic Control, Oct. 1971, pp. 464-468.
Stapleton et al., "Adaptive Noise Cancellation for a Class of Nonlinear, Dynamic Reference Channels", IEEE Trans. on Ckts. & Systems, vol. CAS-32, No. 2, Feb. 1985, pp. 143-150.
Agazzi et al., "Nonlinear Echo Cancellation of Data Signals", IEEE Trans. on Communications, vol. COM-30, No. 11, Nov. 1982, pp. 2421-2433.
Narendra et al., "An Iterative Method for the Identification of Nonlinear Systems Using a Hammerstein Model", IEEE Trans. on Automatic Control, pp. 546-550.

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