Decision-directed control circuit

Details Decision-directed control circuit Decision-directed control circuit

1987-03-02

1988-07-19

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 97, 342362, 455 60, H04B 710, H04B 314

Patent

active

047590360

ABSTRACT:
An improved decision-directed control circuit is disclosed which supplies adjustments to adaptive circuitry in a communications system. The improvement is achieved by only supplying adjustments when there is a high probability that the adjustment is correct. In the disclosed embodiments, this high probability equates, at a minimum, to times when the adaptive circuit output has an amplitude which lies outside of a range extending from the largest to the smallest value of the digital signal. This adjustment approach can be used to adjust a variety of adaptive circuits including transversal equalizers, timing recovery circuits, cross-polarization cancellers and carrier recovery circuits.

REFERENCES:
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patent: 4343041 (1982-08-01), Forney, Jr.
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patent: 4513782 (1985-04-01), Contartese et al.
patent: 4606054 (1986-08-01), Amitay et al.
patent: 4608703 (1986-08-01), Kaga et al.
patent: 4648100 (1987-03-01), Mardirosian
patent: 4656644 (1987-04-01), Ozaki
patent: 4709374 (1987-11-01), Farrow

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