Method of reducing coefficient leakage noise introduced to an eq

Details Method of reducing coefficient leakage noise introduced to an eq Method of reducing coefficient leakage noise introduced to an eq

1998-04-29

2000-12-19

Chin, Stephen

Pulse or digital communications

Equalizers

375232, 708323, H03H 730

Patent

active

061635723

ABSTRACT:
A method of reducing leakage noise introduced to an equalizer in a modem during steady state operation. The equalizer includes forward and feedback filters represented by tap coefficients. The tap coefficients of the filters are updated using least mean squares adaptation equations at a symbol rate during steady state operation. The method of the invention includes the steps of: (a) reducing the absolute value of the updated tap coefficients of the filters at a prescribed rate that is less than the symbol rate. Long term convergence stability is improved and leakage noise is reduced by leaking the filter coefficients less frequently than the symbol rate.

REFERENCES:
patent: 4243959 (1981-01-01), Duttweiler
patent: 4467441 (1984-08-01), Gritton
patent: 4575857 (1986-03-01), Murakami
patent: 5541956 (1996-07-01), Ueda
patent: 5661753 (1997-08-01), Iemura
patent: 5689528 (1997-11-01), Tsujimoto
patent: 5694423 (1997-12-01), Larsson et al.
patent: 5937007 (1999-08-01), Raghunath

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