Adaptive equalizer for binary signals and method of operating sa

Details Adaptive equalizer for binary signals and method of operating sa Adaptive equalizer for binary signals and method of operating sa

1984-04-19

1986-02-18

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

364723, 364724, 375 14, H04B 306, G06F 1531

Patent

active

045717320

ABSTRACT:
An adaptive equalizer for high-speed binary signals, operating in baseband, comprises a transversal filter receiving digitized samples of incoming symbols and feeding them to a decision stage. The samples also go to a coefficient computer, in parallel with that filter, which includes a filter simulator, an error calculator and a processor delivering corrective coefficients to the filter. A register in the filter simulator accumulates a predetermined multiplicity of received samples (e.g. 150) which are jointly convoluted with an initial set of coefficients to yield a mean square error supplied by the error calculator to the processor; the latter, for each coefficient of the initial set, selects two collateral values which are successively substituted for that coefficient to yield two further mean square errors. Using an algorithm based upon a parabolic function, the processor computes an optimized coefficient which is rounded to the nearest power of 2 constituting a new coefficient replacing the corresponding coefficient of the initial set. After all coefficients of the initial set have been thus replaced to produce an updated set, the processor determines whether the resulting mean square error is less than that obtained with the initial set and, if so, substitutes the updated set for the initial set in the transversal filter.

REFERENCES:
patent: 4243924 (1981-01-01), Onoda et al.
patent: 4394768 (1983-07-01), Sari
patent: 4468786 (1984-08-01), Davis
patent: 4489391 (1984-12-01), Morikawa
S. Takenaka et al. "A Transversal Fading Equalizer for a 16-QAM Microwave Digital Radio" 1981 IEEE, pp. 46.2.1-46.2.5, Japan.
C. L. Chao et al. "A Comparative Performance Evaluation of Slope Equalizers and Decision Directed Weight Control Equalizers" 1982 IEEE, pp. 1233-1239, California.
Y. L. Kuo et al. "A Baseband Adaptive Equalizer for a 16-State QAM Digital System Over Mastergroup Band Analog Network", 1982 IEEE, pp. 1246-1250.
G. Pirani et al. "Multiplication-Free Filters for Subband Coding of Speech", vol. X-No. 5, Oct. 1982, pp. 389-393, Italy.
G. Pirani et al. "Multiplication-Free Equalizer for Multipath Fading Channels", vol. X-No. 4, Aug. 1982, pp. 243-248, Italy.

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