Digital equalizer and FM receiver having same

Details Digital equalizer and FM receiver having same Digital equalizer and FM receiver having same

1990-03-26

1992-10-20

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

333 18, 375 98, H04L 2701

Patent

active

051576910

ABSTRACT:
A digital equalizer has a digital filter. The digital filter is supplied with a digital input signal which corresponds to a multiplex signal composed of a plurality of signal components that are different in amplitude or phase and have the same frequency, and effects a computational digital filtering process on the supplied digital input signal. The digital filter is connected to a feedback circuit. The feedback circuit compares an output signal from the digital filter with a predetermined reference value signal. The feedback circuit has a multiplier which multiplies the output signal from the digital filter by a coefficient signal corresponding to an error of the output signal with respect to the predetermined reference value signal. Based on an output signal from the multiplier, the feedback circuit controls the amplitude of the output signal from the digital filter so as to be constant.

REFERENCES:
patent: 4071827 (1978-01-01), Koike et al.
patent: 4456893 (1984-06-01), Otani
patent: 4604755 (1986-08-01), Murray
patent: 4799025 (1989-01-01), Queau
patent: 4839905 (1989-06-01), Mantovani
patent: 5003555 (1991-03-01), Bergmans
"A New Approach to Multipath Correction of Constant Modulus Signals" IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-31, No. 2, Apr. 1983.
"Multipath Cancelling of Constant Envelope Signal Using Decision Feedback", by Makoto Itami and Mitsutoshi Hatori, of the University of Tokyo, Engineering Faculty; 1987.
"A Modified Adaptive FIR Equalizer For Multipath Echo Cancellation in FM Transmission", IEEE Journal on Selected Areas in Communications, vol. SAC-5, No. 2, Feb. 1987.

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