Method and apparatus for receiving a data signal modulated by me

Details Method and apparatus for receiving a data signal modulated by me Method and apparatus for receiving a data signal modulated by me

1982-11-19

1984-11-06

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329 50, H03D 124

Patent

active

044816464

ABSTRACT:
A method and apparatus for receiving a data signal modulated by means of a double sideband-quadrature carrier modulation technique in which the received signal is sampled at a rate higher than the signaling rate 1/T, passed through a compensating filter, and applied to a processing system which provides the detected data. The compensating filter is such that the amplitudes of the components at f.sub.1 =f.sub.c -1/2T and f.sub.2 =f.sub.c +1/2T, where f.sub.c is the carrier, are equal. An initializer enables a filter coefficient to be determined during the turn-on time of the receiver. An adjusting device allows this coefficient to be continually adjusted. The invention can be used in data transmission systems whose channel has an asymmetric amplitude-frequency response curve.

REFERENCES:
patent: 3670269 (1972-06-01), Starr et al.
patent: 4087757 (1978-05-01), Cunningham
patent: 4130806 (1978-12-01), Gerwen et al.
patent: 4247940 (1981-01-01), Mueller et al.
patent: 4262360 (1981-04-01), Bigo et al.
patent: 4272845 (1981-06-01), Fiumani
patent: 4408332 (1983-10-01), Sari

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