QUADRATURE PHASE MODULATOR OR QUADRATURE PHASE DEMODULATOR FOR SIGNAL TAKING PLURAL PHASE STATES OR CORRECTION DEVICE FOR QUADRATURE PHASE DEFECT FOR BOTH AND CORRESPONDING TRANSMITTER AND RECEIVER

摘要

PROBLEM TO BE SOLVED: To provide a correction device suitable for correcting a large quadrature phase defect with accurate correction at a low cost and correcting any quadrature phase defect by including a processing means to supply two corrected amplitude levels based on an amplitude level. ;SOLUTION: Amplitude levels P, Q at a base band are given to the correction device 51. The correction device 51 is the same device as that used at a level of a transmitter having correspondence for a signal RF, for example, and generates corrected levels P'=P+Q and Q'=Q-P. A array group defined by two virtual axes X', Y' in a quadrature phase is obtained by the corrected amplitude levels P', Q' generated by the correction device 51. Then the corrected amplitude levels P', Q' are applied to automatic gain controlled amplifier means 70, 71 warranting the same amplitude up to a highest level of the corrected amplitude levels P', Q' in order to recover the array group of symbols equally distributed with respect to the origin.;COPYRIGHT: (C)1997,JPO