Patent ID: 7251461

Claim:
A self-heterodyne-type wireless diversity communications system, comprising a wireless millimeter-wave band transmitter for mobile communications in a multicell, the wireless millimeter-wave band transmitter modulating intermediate-frequency signals to modulated radio-frequency signals applying a local oscillation signal, and wirelessly transmitting the local oscillation signal and the modulated radio-frequency signals added on the local oscillation signal; and a wireless millimeter-wave band receiver for the mobile communications in the multicell, the wireless millimeter-wave band receiver demodulating the modulated radio-frequency signals added with the local oscillation signal into demodulated intermediate-frequency signals applying a multiplicative element produced by multiplying the local oscillation signal and the modulated radio-frequency signals, the wireless millimeter-wave band transmitter further including: an intermediate-frequency-band modulator that modulates signals to be transmitted into the intermediate-frequency signals; a plurality of signal distributors that distribute the intermediate-frequency signals; a plurality of signal-transmission units that modulates the distributed intermediate-frequency signals into the modulated radio-frequency signals; and a plurality of mixers that add the distributed intermediate-frequency signals and the local oscillation signal.