| 摘要 |
PROBLEM TO BE SOLVED: To enable communication by obtaining the direction of a terminal based on connection request signals from the terminal, and directing an antenna toward a null point where a radio wave area including spurious radiation does not exist in the obtained direction. SOLUTION: The connection request signals from the terminal Z received by an array antenna 2 are supplied to an adaptive array 14 and a parameter estimation device 15. The parameter estimation device 15 detects the information of the direction of the terminal Z by the output of the adaptive array 14 and signals supplied from the antenna 2 and temporarily stores it in a memory 16. Then, the signals from the terminal A already provided with a directional area are received by the array antenna 2 and supplied to a signal composing unit 17. The signal composing unit 17 composes he signals of the terminal A and the information of the terminal Z stored in the memory 16, then the antenna is directed toward the null point where radio waves do not exist in the direction of the terminal Z without changing the directional area for the terminal A.
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