demodulator circuits c 5 and c 6 are the same as that of the demodulator circuit c 4 also the demodulator circuits c 5 and c 6 have the same functions as the demodulator circuit c 4 referring to fig5 the demodulator circuit c 4 includes an input end 201 correlators 202 a 202 b and 203 a propagation path estimator 204 and multipliers 205 and 206 the correlator 202 a performs a pre operation for demodulating information of the supplemental channel signal the correlator 202 b performs a pre operation for demodulating information of the fundamental channel signal functions of the correlators 202 a and 202 b described below are the same as that of the correlator 102 see fig4 the correlator 202 a operates first correlation values of an inphase component of the received signal rs 1 input to the input end 101 and the same code sequence as the first orthogonal code sequence used in the aforementioned modulator device 10 so that the correlator 202 a outputs data having a high peak of the operated first correlation values as a first symbol in addition the correlator 202 a operates second correlation values of a quadrature component of the received signal rs 1 input to the input end 101 and the same code sequence as the second orthogonal code sequence used in the aforementioned second modulator device 10 the correlator 202 a outputs data having a high peak of the operated second correlation values as a second symbol the correlator 202 b.