Transversal filter useable in echo canceler, decision feedback e

Details Transversal filter useable in echo canceler, decision feedback e Transversal filter useable in echo canceler, decision feedback e

1994-12-12

1996-06-11

Chin, Stephen

Pulse or digital communications

Equalizers

375350, H03H 730, H04B 110

Patent

active

055263771

ABSTRACT:
The need to employ costly precision components to reduce non-linearities in the signal processing path of noise reduction circuitry such as an echo canceler and decision feedback equalizer is successfully addressed by a transversal filter which is capable of effectively tracking for non-linearities in system components that manifest themselves as added noise introduced into the signal propagation path. This non-linear tracking capability is attained by employing cascaded sets of weighting coefficient and scaling factor multiplying stages. The first set of weighting coefficients effectively modifies the contents of each of the transmitted symbol samples in the transversal filter delay line to produce respective sets of `partial sums` associated with the respective data symbols employed in the data modulation scheme. The second, cascaded set of `scaling` coefficients or factors is employed to scale selected ones of the sets of the partial sums.

REFERENCES:
patent: 4594479 (1986-07-01), Farrow et al.
patent: 4805215 (1989-02-01), Miller
patent: 4888762 (1989-12-01), Arai
patent: 4972406 (1990-11-01), Dedic
patent: 4995030 (1991-02-01), Helf
patent: 5029167 (1991-07-01), Anon et al.
patent: 5119401 (1992-06-01), Tsujimoto
patent: 5222084 (1993-06-01), Takahashi

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