Automatic equalizer

Details Automatic equalizer Automatic equalizer

1994-02-23

1995-05-23

Chin, Stephen

Pulse or digital communications

Equalizers

Automatic

36472416, 333 18, 375233, H03H 1500, H03H 740

Patent

active

054188164

ABSTRACT:
An automatic equalizer is used in a radio transmission path for improving convergent characteristics of a control loop in an automatic equalizing mode when the amplitude ratio of reflected and direct waves is greater than 1. The automatic equalizer has an adaptive matched filter, a decision feedback equalizer, and a reset control circuit for outputting first and second reset signals, respectively, to the adaptive matched filter and the decision feedback equalizer when an asynchronous condition is detected. After the first and second reset signals are generated, thereby resetting the adaptive matched filter and the decision feedback equalizer simultaneously, the first reset signal is eliminated before the second reset signal is eliminated. The decision feedback equalizer is thus brought into the automatic equalizing mode after the adaptive matched filter has entered the automatic equalizing mode and symmetrized impulse responses.

REFERENCES:
patent: 4972433 (1990-11-01), Yamaguchi et al.
patent: 5230006 (1993-07-01), Kurakami
patent: 5313411 (1994-05-01), Tsujimoto
patent: 5327458 (1994-07-01), Yamamoto
K. Okanoue et al., "New Equalizing System for Super Multilevel QAM", B-929, 1989 Spring Nat'l Con. Record, The Inst. of Electronics, Information and Communication Engineers; Mar. 28-31, Higashi-Osaka, Japan.
K. Watanabe, "Adaptive Matched Filter and Its Significance to Anti-Multipath Fading", 46.2, International Conference on Communications '86, IEEE, Jun. 22-25, 1986, Toronto, Canada.
M. Muroya et al., "Automatic Equalizing of Time Domain", 6.1.2, Digital Radio Communication, Dig. Comm. Series: pub. Sangyo-Tosho Co., Ltd. Tokyo, Japan: 1st ed., Aug. 1985, pp. 122-127.

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