Secure communication method, transmission apparatus and reception apparatus

摘要

A transmitting apparatus that transmits signals from a plurality of antennas, and can improve the security of communication compared with a conventional system. In this apparatus, an antenna changing section ( 105 ) stores an antenna change pattern in internal memory, and each time a clock signal is input, generates an antenna change signal directing an antenna change in accordance with the antenna change pattern, and outputs this signal to an antenna selection section ( 106 ). Based on the antenna change signal, the antenna selection section ( 106 ) selects two different antennas from among the transmitting antennas ( 107 - 1 through 107 - 3 ) as transmitting antennas of transmit signal A output from a radio section ( 104 - 1 ) and transmit signal B output from a radio section ( 104 - 2 ), and performs radio transmission of transmit signal A and transmit signal B using the selected transmitting antennas.