Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1997-02-28
1999-08-17
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
375346, 379406, 379410, 379411, 370286, 370289, 370290, 370291, H04B 110, H04B 320, H04M 100
Patent
active
059404558
ABSTRACT:
An input signal is supplied to a tapped-delay line adaptive filter to produce tap signals which are equally divided into groups. The tap signals are selectively coupled on a per group basis through a switch to coefficient generators where tap-weight coefficients are produced. The selected tap signals are weighted respectively by the coefficients and summed together to produce a correction signal, which is combined with an output signal which is a replica of the input signal. The coefficients are updated with a residual error of the correction signal. Using the coefficients, the hopping order for selecting a tap group and the dwell time of the tap group are determined. Total power of the selected tap signals is monitored. When the monitored power is lower than a threshold value, the determination of the hopping order and dwell time is disabled, coefficient updating is disabled, and the residual error is nullified for fast convergence.
REFERENCES:
patent: 4131767 (1978-12-01), Weinstein
patent: 4468640 (1984-08-01), Gritton
patent: 4468641 (1984-08-01), Duttweiler et al.
patent: 4479036 (1984-10-01), Yamamoto et al.
patent: 4591669 (1986-05-01), Duttweiler et al.
patent: 4805215 (1989-02-01), Miller
patent: 4823382 (1989-04-01), Martinez
patent: 5084865 (1992-01-01), Koike
patent: 5371789 (1994-12-01), Hirano
patent: 5473686 (1995-12-01), Virdee
patent: 5533120 (1996-07-01), Staudacher
patent: 5646964 (1997-07-01), Ushirokawa et al.
patent: 5657384 (1997-08-01), Staudacher et al.
patent: 5687229 (1997-11-01), Sih
patent: 5703903 (1997-12-01), Blanchard et al.
S. Ikeda et al., "A Fast Convergence Algorithm for Sparse-Tap Adaptive Fir Filters for Unknown Number of Multiple Echoes", 1994 IEEE, U.S.A., vol. 3, No. XP-002064578, pp. III-41/III-44.
Chin Stephen
Maddox Michael W.
NEC Corporation
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