| 摘要 |
In a transmitter 2 A, after an output level of a modulated signal is regulated by a first gain regulator 5 A, the signal is transmitted from a first antenna 8 A without delay, and after the modulated signal is delayed by a delay unit 6 A and an output level of the delay output is regulated by a second gain regulator 7 A, this signal is transmitted from a second antenna 9 A. Similarly, in a transmitter 2 B, after an output level of a modulated signal is regulated by a first gain regulator 5 B, the signal is transmitted from a first antenna 8 B without delay, and after the modulated signal is delayed by a delay unit 6 B and an output level of the delay output is regulated by a second gain regulator 7 B, this signal is transmitted from a second antenna 9 B. A receiver 3 receives the transmitted signals from the four antennas 8 A, 8 B, 9 A and 9 B via an antenna 10 , and executes a demodulation process.
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