Carrier regeneration circuit

Details Carrier regeneration circuit Carrier regeneration circuit

H - Electricity

03

D

329/5, 325/80

H03D 1/00 (2006.01) H04L 27/38 (2006.01)

Patent

CA 1071718

Abstract of the Disclosure A carrier regeneration circuit regenerates the carrier from the QAM (Quadrature Amplitude Modulated) signal obtained by a quadrature partial response modulation system wherein the carriers having the same frequency but a phase difference of 90° are amplitude modulated with two parallel sig- nals which have been subjected to the partial response conversion. The carrier regeneration circuit comprises a probability decision circuit which decides the probability of generation of the demodulated data combination, and a carrier regeneration circuit which keeps phase ambiguity of the regen- erated carrier a multiple of 90° by controlling the phase of the regenerated carrier by the output of the probability decision circuit whether or not it must be shifted by 45°.

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