Linear distortion canceller circuit

Details Linear distortion canceller circuit Linear distortion canceller circuit

1982-12-29

1984-11-06

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 99, 328163, H04B 1500

Patent

active

044816456

ABSTRACT:
The linear distortion canceller circuit (104, 104-1) obliterates the linear component of any amplitude and/or group delay distortion in a double-sideband, amplitude modulated carrier signal. Pursuant to the present invention, the carrier signal is split into first and second signals. The first signal is multiplied by a mixing signal at twice the carrier signal frequency and the mixed first signal is then added with the second signal. The disclosed apparatus and method can be used in a communications system utilizing QAM modulation.

REFERENCES:
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patent: 3825843 (1974-07-01), Felsberg et al.
patent: 3955050 (1976-05-01), Di Toro
patent: 4016497 (1977-04-01), Miedema
patent: 4048559 (1977-09-01), Miedema
patent: 4088948 (1978-05-01), Miedema
patent: 4088955 (1978-05-01), Baghdady
patent: 4109212 (1978-08-01), Donnell et al.
patent: 4122399 (1978-10-01), Heiter et al.
patent: 4130811 (1978-12-01), Katz et al.
patent: 4143322 (1979-03-01), Shimamura
patent: 4310920 (1982-01-01), Hayes
The Bell System Technical Journal, vol. 60, No. 11, Nov. 1981, pp. 1997-2021.

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