| 摘要 |
In a transmitter (2A), a modulated signal is subjected to a level adjustment by a first gain control circuit (5A) and transmitted from a first antenna (8A) without a delay, and the modulated signal is also delayed a predetermined time by a delay unit (6A), subjected to a level adjustment by a second gain control circuit (7A) and transmitted through a second antenna (9A). Similarly in a transmitter (2B), a modulated signal is subjected to a level adjustment by a first gain control circuit (5B) and transmitted from a first antenna (8B) without a delay, and the modulated signal is also delayed a predetermined time by a delay unit (6B), subjected to a level adjustment by a second gain control circuit (7B) and transmitted through a second antenna (9B). In a receiver (3), the signals transmitted from the four antennas (8A, 8B, 9A, 9B) are received by an antenna (10) and demodulated.
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