To ensure high security without changing a communication system greatly.
Data supplying sections 1501, 1502 hold data for each channel. Modulation and spreading sections 1503, 1504 modulate the data for each channel, spread the data using a spreading code corresponding to the channel and output spreading signals. A weighting section 1505 multiplies a transmission signal and a transmission weighting coefficient. A transmission section 1506 converts a modulated signal into an RF signal to be transmitted and outputs the RF signal. An antenna 1507 transmits the transmission signal. A data supplying section 1508 stores first data. A reference propagation buffer 1509 holds the reference information of a propagation environment. A propagation control section 1510 inputs an encryption key, second data and propagation information and calculates a transmission weighting coefficient.
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MURAKAMI YUTAKA
ABE KATSUAKI
MATSUOKA AKIHIKO
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