Importance

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Abstract

In a transmitting section, a modulator modulates a first carrier with datao be transmitted, thereby producing a modulated output f.sub.m, a local oscillator generates a local oscillating signal to be used as a second carrier f.sub.LO, a mixer mixes the modulated output and the local oscillating signal, thereby generating waves of different frequencies. These waves include an upper side band wave f.sub.LO +f.sub.m and a lower side band wave f.sub.LO -f.sub.m. A transmitting antenna radiates electromagnetic waves into the air, which includes the waves of different frequencies generated by the mixer. In a receiving section, a receiving antenna receives the electromagnetic waves, a diversity section extracts at least one of the upper side band and lower side band waves f.sub.LO +f.sub.m, f.sub.LO -f.sub.m from the waves of different frequencies received by the receiving antenna, a local oscillator generates a local oscillating signal corresponding to the second carrier, a mixer mixes the one wave extracted by the diversity section and the local oscillating signal generated by the local oscillator, thereby generating an output, and a demodulator extracts a signal corresponding to the first carrier, from the output of the mixer, and demodulates the signal thus extracted, thereby outputting data corresponding to the data transmitted from the transmitting section.

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