Asynchronous and non-data decision directed equalizer adjustment

Details Asynchronous and non-data decision directed equalizer adjustment Asynchronous and non-data decision directed equalizer adjustment

1985-07-25

1987-01-06

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 14, 375 16, 333 18, H04B 304

Patent

active

046352767

ABSTRACT:
Equalizers, which provide distortion compensation for a modulated carrier signal having a time-varying signal envelope, are adjusted at selected times in response to the signal envelope and the data signals regenerated therefrom. Each selected time corresponds to a time when the signal envelope has a preselected value. Advantageously, the disclosed equalizer adjustment is unaffected by loss of receiver synchronization to the modulated carrier signal and is applicable to a variety of communications systems and modulation formats.

REFERENCES:
patent: 3843942 (1974-10-01), Pierret et al.
patent: 3890572 (1975-06-01), Desblanche et al.
patent: 4097806 (1978-06-01), Evans
patent: 4227152 (1980-10-01), Godard et al.
patent: 4343041 (1982-08-01), Forney, Jr.
patent: 4545060 (1985-10-01), Arnon
Carlson, Communications Systems, McGraw-Hill, 1975, pp. 5-7.
IEEE Trans. on Comm. vol. COM-28, No. 11 "Self-Recovery Equalization and Carrier Tracking in Two-Dimensional Data Communication Systems," by D. N. Goddard, pp. 1867-1875.

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