Transversal filter allrate equalizer for use at intermediate fre

Details Transversal filter allrate equalizer for use at intermediate fre Transversal filter allrate equalizer for use at intermediate fre

1994-03-04

1995-08-15

Mai, Tan V.

Boots, shoes, and leggings

36472416, 375235, G06G 702, G06F 1531

Patent

active

054425824

ABSTRACT:
A transversal filter allrate equalizer for use at intermediate frequency. The equalizer includes a signal divider coupled to receive the intermediate frequency input signal and a transversal filter comprising a plurality of analog delay lines and a plurality of multiplying circuits. The plurality of analog delay lines are coupled to the signal divider for producing a time-shifted replica of an intermediate frequency input signal. The plurality of multiplying circuits are respectively coupled to the delay lines for weighting the time-shifted replicas of the input signal by complex numbers, W.sub.i. A signal combiner is coupled to the plurality of multiplying circuits for recombining the time-shifted and weighted replicas of the input signal to produce an equalized output signal. The delay lines operate at an intermediate frequency, and produce a time delay for the modulation and a phase shift for the carrier. The phase shift may be compensated for by adjusting the phases of the tap weights, W.sub.i. The equalizer reduces distortion and intersymbol interference in high data rate digital communications systems, such as modems, and the like.

REFERENCES:
patent: 4149259 (1979-04-01), Kowalski
patent: 4797844 (1989-01-01), Jackson
patent: 5311459 (1994-05-01), D'Luna et al.

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