Pulse or digital communications – Repeaters – Testing
Patent
1990-12-20
1993-10-05
Kuntz, Curtis
Pulse or digital communications
Repeaters
Testing
375 15, 375 94, 375 96, H03H 730
Patent
active
052512339
ABSTRACT:
An equalization system for equalizing a corrupted signal is disclosed. The equalization system includes a complex matched filter (400) and a maximum likelihood sequence estimator (MLSE) (405) for removing the effects of phase shift, amplitude variations, intersymbol interference, etc. resulting from multi-pathing and noise contributed by the receiver front end. The system estimates a correlation signal C(t) (505) and synchronizes C(t) 505 to maximize its energy as seen on the taps of the complex matched filter (400). Taps having amplitude coefficients below a predetermined threshold are set to zero to produce a modified CIR estimate. The modified CIR estimate which has had the effects of noise virtually eliminated, is then used to construct the complex matched filter (400) and is also used as input to the MLSE (405) to produce a better equalized data signal.
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Kotzin Michael D.
Labedz Gerald P.
Schuler Joseph J.
Ghebretinsae T.
Jenski Raymond A.
Kuntz Curtis
Motorola Inc.
Sonnentag Richard A.
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