Method and apparatus for receiving a data signal modulated...

Details Method and apparatus for receiving a data signal modulated... Method and apparatus for receiving a data signal modulated...

H - Electricity

04

B

325/72

H04B 1/16 (2006.01) H04L 27/01 (2006.01)

Patent

CA 1188369

ABSTRACT METHOD AND APPARATUS FOR RECEIVING A DATA SIGNAL MODULATED BY MEANS OF A DOUBLE SIDEBAND-QUADRATURE CARRIER MODULATION TECHNIQUE 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 sign- aling 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 com- ponents at f1=fc-1/2T and f2-fc+1/2T, where fc 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 adjust- ed. The invention can be used in data transmission systems whose channel has an asymmetric amplitude- frequency response curve.

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