Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1995-05-26
1996-09-17
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
375347, 375350, 375232, 455307, H03D 104, H04B 710, H04B 110
Patent
active
055576460
ABSTRACT:
First, an adaptive filter 15 provided in a reflective wave detection unit 13 performs an adaptive operation on a digital signal inputted to an input terminal 10 for eliminating a multipath component from the digital signal. Also, a filter update unit 21 updates filter coefficient for a digital filter 18 comprising an FIR filter of lower degree. After the elapse of a predetermined time, reflective wave estimation unit 16 estimates reflection coefficient and delay time of a reflected wave contained in the digital signal from a filter coefficient at that point of time, and outputs the estimated values to a controller 14. Based on the input estimated values, the controller 14 initializes a delay time of a delay element of a digital filter 23 comprising an IIR filter of first degree of a multipath eliminating adaptive filter 11 and a multiplication coefficient of a multiplication element of the same. Then, the controller 14 causes the multipath eliminating adaptive filter 11 to performance adaptive filter for eliminating a multipath component.
REFERENCES:
patent: 5233633 (1993-08-01), Baum et al.
patent: 5268930 (1993-12-01), Sendyk et al.
Chin Stephen
Ferguson Jr. Gerald J.
Kabushiki Kaisha Kenwood
Luu Huong
Robinson Eric J.
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