PROBLEM TO BE SOLVED: To eliminate crosstalk interference to minimize channel parameter estimation errors and to improve reception performance by using Walsh codes in mutually orthogonal relation and making an I-arm and a Q-arm orthogonal with each other.

SOLUTION: Pilot signals I-input data and Q-input data are respectively inputted to a pilot channel 111 the I-arm 112 and the Q-arm 113 and the pilot signals are amplified 10. The two Walsh codes orthogonal with each other are respectively multiplied with I-input signals and Q-input signals in multipliers 13a and 13b and spread. The amplified 10 pilot signals are added 14 with the spread I input signals pseudo-modulated by the multiplier 15a and spread to a PN code. Also the spread Q-input signals are spread by the multiplier 15b. The spread I-signals and Q-signals are turned to pulses by forming filters 11a and 11b amplitude-modulated 17a and 17b to a cosine and a sine added 16 and transmitted through an antenna 12.

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