Pulse or digital communications – Equalizers – Automatic
Patent
1994-03-24
1997-07-15
Chin, Stephen
Pulse or digital communications
Equalizers
Automatic
3647242, 348607, H04L 2701, H04N 521
Patent
active
056489870
ABSTRACT:
In response to a received carrier wave modulated in accordance with a digital signal, a digital radio receiver recovers in digital form a modulating signal that is at times subject to undesirable amounts of multipath distortion. This recovered modulating signal is applied as respective input signals to first and second finite-impulse-response (FIR) filters, each of an N-tap type, the taps of which are adaptively weighted. The first FIR filter responds to the modulating signal to supply an output signal in which multipath distortion is suppressed. The second FIR filter responds to the modulating signal to generate corrections for the tap weights of the first FIR filter, which corrections are generated more rapidly than can be done with a microprocessor of the type commonly known as a "digital signal processor" or "DSP". A digital comparator compares samples of the first FIR filter response to corresponding samples of an ideal response, thereby to generate updated tap weights for the second FIR filter.
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Limberg Allen Le Roy
Liu Tianmin
Patel Chandrakant Bhailalbhai
Yang Jian
Chin Stephen
Gluck Jeffrey W.
Samsung Electronics Co,. Ltd.
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