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

1984-08-13

1986-04-01

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

364724, 375 14, H04B 314

Patent

active

045802750

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. An error signal derived from the difference between the filtered and the decided samples, for each coefficient of the transversal filter and for each iteration of the processing by that coefficient, is fed to an updating unit, where its sign is compared with the sign of the corresponding filtered sample to determine their identity or disparity. The result is a binary discriminating signal sent to a coefficient calculator and to a threshold generator which receives from that calculator the current coefficient and, dependent on the polarity of that coefficient and on the logical value of the discriminating signal, produces a threshold value to be compared with the absolute magnitude of the error signal. Whenever that absolute magnitude exceeds the existing threshold, it causes the count of an up/down counter to be incremented or decremented, depending on whether the two compared signs are different or equal. Whenever the up count of the down count reaches a predetermined limit in any cycle, the counter resets itself to zero and triggers the calculator to update the existing coefficient, again on the basis of the discriminating signal, by either halving or doubling that coefficient.

REFERENCES:
patent: 3571733 (1971-03-01), Fang
patent: 3633105 (1972-04-01), Lender et al.
patent: 3992616 (1976-11-01), Acker
A Transversal Fading Equalizer for a 16-QAM Microwave Digital Radio by Tanaka et al. IEEE International Conference Denver, Jun. 1981 pp. 46.2.1-46.2.5.
Multiplication Free Filters for Subband Coding of Speech by Pirani et al., IEEE International Symposium Rome, May 1982.
Multiplication Free Equalizers for Multipath Fading Channels by Pirani et al., IEEE International Conf. on Communications--Philadelphia, Jun. 1982.
A Comparative Evaluation of Slope Equalizers . . . by Chao et al., IEEE Globecom Conf., Miami Nov. Dec. 1982.
A Baseband Adaptive Equalizer . . . by Kuo et al. same as above.

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