Adaptive equalizer for binary signals and method o

专利名称：Adaptive equalizer for binary signals and

method of operating same

发明人：Giancarlo Pirani,Valerio Zingarelli申请号：US06/640513申请日：19840813公开号：US04580275A公开日：19860401

摘要：An adaptive equalizer for high-speed binary signals, operating in baseband,comprises a transversal filter receiving digitized samples of incoming symbols andfeeding them to a decision stage. An error signal derived from the difference betweenthe filtered and the decided samples, for each coefficient of the transversal filter and foreach iteration of the processing by that coefficient, is fed to an updating unit, where itssign is compared with the sign of the corresponding filtered sample to determine theiridentity or disparity. The result is a binary discriminating signal sent to a coefficientcalculator and to a threshold generator which receives from that calculator the currentcoefficient and, dependent on the polarity of that coefficient and on the logical value ofthe discriminating signal, produces a threshold value to be compared with the absolutemagnitude of the error signal. Whenever that absolute magnitude exceeds the existingthreshold, 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 upcount of the down count reaches a predetermined limit in any cycle, the counter resetsitself to zero and triggers the calculator to update the existing coefficient, again on thebasis of the discriminating signal, by either halving or doubling that coefficient.

申请人：SIP - SOCIETA ITALIANA PER L'ESERCIZIO TELEFONICO S.P.A.

代理人：Karl F. Ross,Herbert Dubno

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