Equalizer for the correction of digital signals

Details Equalizer for the correction of digital signals Equalizer for the correction of digital signals

1980-05-09

1981-09-08

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

333 18, 364724, H03K 5159, H04B 304, H04L 2503

Patent

active

042888727

ABSTRACT:
An equalizer designed to correct both precursor and postcursor distortion in signal samples periodically obtained from a digital signal train comprises two parallel, mutually complementary circuit branches each including an upstream filter for linearly correcting one type of distortion and a downstream cell for nonlinearly compensating the other type of distortion. The compensating cell of the first branch includes an adder algebraically combining a feed-forward signal with a signal at least partly freed from postcursor interference in the corresponding upstream filter; the second branch includes another adder algebraically combining a feedback signal from its compensating cell with a prefiltered signal at least partly freed from precursor interference. Purged signals from both adders are combined in a summing stage followed by a decision unit which emits a quantized pulse to be used either directly as a decided symbol or as a source of corrective pulses for postcursor and precursor elimination in another linearly prefiltered sample.

REFERENCES:
patent: 4020333 (1977-04-01), Nussbaumer
patent: 4034196 (1977-07-01), Butterwreck et al.
patent: 4170758 (1979-10-01), Tamburelli
"Error-Rate Improvement Through Digital Decision in Pulse Transmissions", by T. Osatake et al., Electronics and Communications in Japan, vol. 49, No. 10, Oct. 1966, pp. 28-35.
"Decision Feedback and Feedforward Received (For Rates Faster Than Nyquist's)", by G. Tamburelli, CSELT Rapporti Tecnici, No. 2, Jun. 1976.
"Nonlinear Equalizer with Shaping Filter for Optical Fibers", by G. Tamburelli, CSELT Rapporti tecnici, No. 4, Sep. 1977.

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