To eliminate the influence of co-channel interference due to a multipath while keeping spreading gain constant by converting and demodulating a frequency, restoring a spreading signal to plural of original data, integrating these of data and making them received data.

The high frequency signals received by reception antennas 107 and 127 are converted into intermediate frequency signals by frequency converters 108 and 128 and the signals are demodulated into randam data in demodulators 109 and 129. Spreading code generators 110 and 130 generate the two spreading codes equal to those on a transmission side and these codes are multiplied by demodulation random data by inverse spreaders 111 and 131. At this stage, phases are synchronized in transmission and reception for the repeating period of the spreading code and the outputs of the inverse spreaders 111 and 131 are discriminated as binary codes by discriminators 112 and 132. These two data are integrated by a multiplexor 115 and the received data of the period which is equal to transmission data can be obtained at an output terminal 113.