Demodulation system having adaptive matched filter and decision

Details Demodulation system having adaptive matched filter and decision Demodulation system having adaptive matched filter and decision

1994-02-02

1995-02-28

Grimm, Siegfried H.

Demodulators

Phase shift keying or quadrature amplitude demodulator

329318, 375230, 375232, H03H 730

Patent

active

053941101

ABSTRACT:
In a modulation system, a demodulator demodulates an intermediate frequency modulated signal and outputs an analog-baseband signal, and an analog-digital converter analog-digital converts this baseband signal. An adaptive matched filter inputs the output of the analog-digital converter and makes symmetrical the impulse response of the propagation path. A decision feedback equalizer inputs the output of the adaptive matched filter and eliminates the intersymbol interference. A reset circuit judges the fading type using tap coefficients within the decision feedback equalizer, and stops the operation of the adaptive matched filter in cases of minimum phase shift type fading. The adaptive matched filter is constructed so as to operate in an intermediate frequency band as well as in a baseband.

REFERENCES:
patent: 5321723 (1994-06-01), Mizoguchi
patent: 5331663 (1994-07-01), Kurokami
Patent Abstracts of Japan, vol. 16, No. 294 (E-1225), Jun. 29, 1992.
Corrales et al., "A Technique for Minimum/Non-Minimum Phase Identification During Multipath Fading", IEEE Global Telecommunications Conference, Globecom '90, Dec. 2-5, 1990, pp. 1203-1208.

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